Construction method for highway bridge pile foundation reinforcement construction

Abstract

The invention provides a construction method for reinforcing and building a highway bridge pile foundation. The construction method comprises the steps that side cylindrical sleeve plate assemblies, side plate sleeve plate assemblies and inter-cylinder sleeve plate assemblies are included, and the side cylindrical sleeve plate assemblies achieve torsion resistance reinforcing of cylindrical sections through radial grid frameworks and annular flanges; the side plate sleeve plate assembly adopts a bidirectional anti-bending rib net structure to optimize the stress distribution of a plane transition area; the sleeve plate assemblies between the cylinders ensure efficient transmission of multidirectional loads between the pile foundations through the special-shaped rib plates and the annular sealing flanges. According to the technical effects and technical effects of collaborative construction, a modular assembly system improves the overall construction efficiency and the structural reliability, core parts are linked, the construction process is collaborative, and according to the sequence assembly principle, side cylinder sleeve plates are preferentially installed to serve as main force bearing units, side plate sleeve plates are in butt joint for transition, and finally sleeve plates between cylinders are connected to complete a load transfer closed loop; a whole-process detection system adopts a laser locator to calibrate the axis deviation of the cleading and ultrasonic flaw detection to selectively inspect the quality of a welding seam so as to ensure the structural integrity.

Description

Technical Field

[0001] The present invention relates to the technical field of highway bridge construction, and particularly relates to a construction method for reinforcing and constructing highway bridge pile foundations. Background Art

[0002] With the continuous improvement of the load level of highway bridges and the accumulation of natural environmental erosion, existing pile foundations often have structural defects such as insufficient torsional resistance, stress concentration in variable cross-section areas, and low load transfer efficiency between adjacent pile foundations. Traditional reinforcement methods mostly use concrete or steel plate hoop wrapping for reinforcement, which has the following limitations:

[0003] 1 Structural design defects

[0004] A single reinforcement form (such as a circular steel plate hoop) is difficult to adapt to the different stress requirements of the cylindrical section and the plane transition area of the pile foundation, resulting in a mismatch between torsional stiffness and bending performance; the connection between adjacent pile foundations relies on rigid welding, lacking a multi-directional load decomposition mechanism, and is prone to weld cracking due to stress concentration.

[0005] 2 Construction process deficiencies

[0006] The on-site welding amount is too large, and thermal deformation causes the fit between the reinforcement and the pile foundation to decrease; flange connection relies on manual hole alignment, and misaligned forced tightening causes bolt prestress loss, accelerating the loosening and failure of the structure.

[0007] 3 Durability bottlenecks

[0008] Traditional anti-corrosion coatings are easily peeled off in humid environments, and steel bar corrosion induces the risk of peeling between the reinforcement system and the pile foundation; the sealing performance of the connection part is poor, water and soil infiltration aggravates electrochemical corrosion, and shortens the service life of the reinforcement structure.

[0009] In recent years, although some modular reinforcement technologies (such as patent CN20XX1234567A) have emerged, their sleeve plate components still have problems of single structural function and poor assembly adaptability: there is a lack of mechanical transfer coordination between the plane sleeve plate and the cylindrical sleeve plate, and the variable cross-section area becomes a weak link of the structure; the flange connection does not consider temperature deformation compensation, and additional stress is easily generated in areas with significant day-night temperature differences; the layout of the rib plates does not optimize the load transfer path, resulting in low material utilization rate and a more than 30% increase in the self-weight of the structure.

[0010] Therefore, there is an urgent need for a construction method for reinforcing and constructing highway bridge pile foundations to solve the above problems. Summary of the Invention

[0011] (1) Technical problems to be solved

[0012] In view of the deficiencies of the prior art, the present invention provides a construction method for reinforcing and constructing highway bridge pile foundations to solve the technical problems raised in the background art.

[0013] (II) Technical solution

[0014] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0015] A highway bridge pile foundation reinforcement construction device, comprising:

[0016] The side cylinder sleeve assembly, side plate sleeve assembly and inter-cylinder sleeve assembly, the side cylinder sleeve assembly realizes the anti-torsion reinforcement of the cylindrical section through the radial grid skeleton and the annular flange; the side plate sleeve assembly adopts a bidirectional anti-bending rib mesh structure to optimize the stress distribution in the plane transition zone; the inter-cylinder sleeve assembly ensures the efficient transmission of multi-directional loads between pile foundations through special-shaped ribs and annular sealing flanges. The three work together to form a modular reinforcement system to improve the bearing efficiency and durability of the overall structure.

[0017] Preferably, the side cylindrical sleeve plate assembly is composed of a cylindrical panel formed of an arc-shaped steel plate as a load-bearing base, and a side annular flange is integrally formed on its outer edge along the circumferential direction, and an array of evenly distributed bolt holes is provided on the inner side of the flange; side transverse flanges and side vertical flanges are respectively welded at both axial ends of the cylindrical panel to form a longitudinal docking interface with the adjacent sleeve plate.

[0018] Preferably, on the inner surface of the cylindrical panel, a plurality of side rib plates are welded at equal angles along the circumference, and side vertical ribs are arranged in parallel between every two side rib plates to form a radial grid skeleton with an interval of 30°; the side flange is fixed to the bolt hole gap of the side annular flange in an annular array manner, and is obliquely connected to the side vertical ribs through the side reinforcing ribs to form a triangular truss-type torsion-resistant unit, which effectively suppresses the circumferential deformation of the pile foundation under eccentric load.

[0019] Preferably, the side panel sleeve assembly uses a rectangular steel plate as the side panel panel, the lateral ends of the side panel panel are connected to the side panel lateral flanges by a welding process, and the vertical ends of the side panel panel are welded to the side panel vertical flanges.

[0020] Preferably, the side panel sleeve assembly also includes a bidirectional anti-bending design. On the inner surface of the side panel panel, the side panel transverse reinforcements and the side panel vertical reinforcements are orthogonally arranged at a spacing of 200 mm. The intersection of the transverse and vertical reinforcements is welded and fixed by laser-cut diamond-shaped side panel reinforcement plates to form a honeycomb-like supporting structure. This design enables the side panel sleeve assembly to achieve bidirectional transmission of bending moment through equal strength distribution of transverse and longitudinal reinforcements when subjected to vertical loads, thereby reducing local stress concentration and improving the structural durability of the pile foundation transition zone.

[0021] Preferably, the cylindrical panel between cylinders of the cylindrical panel assembly between cylinders is a semi-cylindrical and flat composite curved steel plate. Transverse flanges between cylinders and vertical flanges between cylinders are respectively arranged at both ends of the cylindrical panel between cylinders for multi-directional connection. Two concentric annular flanges between cylinders are arranged on the outer side of the curved surface section of the cylindrical panel between cylinders. The flanges are circumferentially strengthened by ring ribs between cylinders with a T-shaped cross-section, so that it can withstand the radial extrusion force of adjacent pile foundations.

[0022] Preferably, on the inner surface of the cylindrical panel between cylinders, vertical ribs between cylinders are welded at intervals of 300 mm along the axial direction, and horizontal ribs between cylinders are arranged in the vertical direction. X-shaped joints are formed by rib plates between cylinders at the intersection of the two. Cylindrical flanges between cylinders are additionally arranged at the flange connection part. The design of embedding rubber sealing strips in it realizes waterproof and shock isolation between pile foundations while ensuring the connection strength.

[0023] Preferably, during construction, the side cylindrical panel assembly wraps the cylindrical section of the pile foundation as the main load-bearing unit. Its radial strengthening grid and triangular anti-torsion unit cooperate to convert the upper load into circumferential compressive stress. The side panel assembly realizes the diffusion of bending and shear stresses through a honeycomb structure at the variable cross-section of the pile foundation. The cylindrical panel assembly between cylinders decomposes the interaction forces between adjacent pile foundations into axial and circumferential components through a spatial force transmission system. The three panel assemblies are connected by a flange bolt group to form a continuous force-bearing system, improving the overall lateral stiffness.

[0024] Preferably, a construction method for strengthening and constructing highway bridge pile foundations is as follows:

[0025] I. Construction preparation stage

[0026] Step 1: Prefabrication and processing of the panel

[0027] Cut the materials by laser according to the design drawings, and control the dimensional errors of the side cylindrical panel assembly, the side panel assembly, and the cylindrical panel assembly between cylinders.

[0028] Step 2: All flange connection holes are formed by numerical control stamping process:

[0029] Vertical flange: Punching long holes with a length of 50 mm and a width of 24 mm are opened, and the deviation of the center distance of the hole positions ≤ 1 mm;

[0030] Transverse / annular flange: Standard round holes with a diameter of Φ24 are opened, and the tolerance of the positioning pin holes is reserved for H8 / h7 fit.

[0031] Step 3: Welding quality pre-control

[0032] The rib plates with non-flange connection are welded by CO 2 gas shielded welding, and the fillet weld height ≥ 60% of the steel plate thickness;

[0033] The welding sequence follows "symmetrical welding from the inside to the outside". After completion, use a 3m ruler to check the flatness of the inner wall of the cylinder, and grind the uneven parts to ≤1.5mm / m.

[0034] Preferably, the side cylindrical section is reinforced

[0035] Step 1: Wrap the side cylindrical sleeve assembly around the cylindrical surface of the pile foundation, and insert the positioning pin plate into the pin hole of the side annular flange to achieve precise circumferential positioning;

[0036] Step 2: Bolt pre-tighten the side transverse flange and the adjacent sleeve plate, and increase the torque to 220 N·m three times;

[0037] Step 3: Pour epoxy mortar into the gap between the internal radial reinforcement mesh and the pile foundation surface, and form a composite torsion-resistant structural layer after curing.

[0038] Preferably, the plane transition zone is reinforced

[0039] Step 1: Install the side plate sleeve assembly at the variable cross-section of the pile foundation. Align the punched long holes of the side plate vertical flange with the embedded parts of the pile foundation, allowing ±15mm thermal displacement compensation;

[0040] Step 2: Use high-frequency welding to fix the side panel transverse reinforcement and the side panel vertical reinforcement to form a honeycomb support system;

[0041] Step 3: After the weld passes the ultrasonic flaw detection and the defect rate is less than 0.2%, the polyurethane filling glue is injected to seal the intersection of the ribs.

[0042] Pile foundation connection reinforcement

[0043] Step 1: Align the inter-cylinder annular flange of the inter-cylinder sleeve assembly with the adjacent pile foundation sleeve flange, and insert the positioning pin plate to lock the axial position;

[0044] Step 2: Pre-tighten the rubber sealing strip before installing the inter-cylinder rib plate to ensure that the waterproof performance of the flange connection is ≤0.01L / (m 2 h);

[0045] Step 3: Pour high-strength concrete into the gap between the X-shaped node rib plate and the pile foundation, and form a spatial force transmission skeleton after solidification.

[0046] Three beneficial effects

[0047] Beneficial effects:

[0048] 1. Side cylindrical sleeve assembly

[0049] Technical effect: Improve the torsional stiffness and circumferential bearing capacity of the cylindrical section of the pile foundation.

[0050] Corresponding components: Radial grid skeleton: A radial support system formed by welding side rib plates and side vertical ribs at 30° intervals, which converts eccentric loads into uniform circumferential stresses; Triangular anti-torsion unit: The side flange is obliquely connected to the side vertical rib through the side reinforcing rib to form a truss-type anti-deformation structure.

[0051] Associated construction methods:

[0052] Precise assembly of positioning pins: Insert the positioning pin plate into the positioning pin holes of the side annular flange to ensure the circumferential alignment accuracy when the sleeve plate wraps the pile foundation; Staged bolt pre-tightening: The side horizontal flange and the adjacent sleeve plate are connected by three incremental torque initial tightening → medium tightening → final tightening to avoid bolt stress relaxation.

[0053] II. Side plate sleeve assembly

[0054] Technical effect: Optimize the bending and shear stress distribution in the variable cross-section area of the pile foundation to prevent local fatigue cracking.

[0055] Corresponding components: Honeycomb support structure: The side plate horizontal ribs and the side plate vertical ribs are orthogonally arranged and welded into an equal-strength force transmission grid through diamond-shaped side plate rib plates; Dynamic compensation design: The stamping long holes on the side vertical flange of the side plate allow a thermal expansion and contraction displacement of ±15 mm.

[0056] Associated construction methods: High-frequency welding process: Use CO 2 2 gas shielded welding to continuously weld the rib plate joints to ensure the consistency of the weld penetration depth; Filling glue sealing: Inject polyurethane colloid at the intersection of the rib plates to seal the welding micropores and enhance the anti-seepage performance.

[0057] III. Cylindrical inter-sleeve assembly

[0058] Technical effect: Achieve efficient transmission of multi-directional loads and waterproof and seismic isolation between adjacent pile foundations.

[0059] Corresponding components: Space force transmission skeleton: The vertical ribs between cylinders and the horizontal ribs between cylinders are connected by X-shaped inter-cylindrical rib plates to form a three-dimensional force flow transmission path; Sealing flange structure: The inter-cylindrical flange is embedded with a rubber sealing strip to block the penetration of water and soil and buffer vibration impact.

[0060] Associated construction methods: Pre-pressurization sealing process: Pre-pressurize the rubber strip in the flange groove to a compression rate of 30% before installation to ensure the tightness of the interface; Composite perfusion reinforcement: Synchronously pour high-strength concrete and epoxy resin into the rib plate gaps to form a "steel-concrete" composite force transmission medium.

[0061] IV. Technical effects of coordinated construction

[0062] Technical effect: The modular assembly system improves the overall construction efficiency and structural reliability

[0063] Linkage of core components: Universal positioning pin plates across components: The flange holes of the three sets of plates all use a unified specification positioning pin, with a new label 4 added to achieve rapid alignment; Standardization of bolt group connections: All flange bolt holes are designed according to ISO standards, compatible with cross-connections between different sets of plates.

[0064] Coordination of construction process: Principle of sequential assembly: First install the side cylindrical sleeve plate as the main load-bearing unit → Connect the side plate sleeve plates for transition → Finally connect the sleeve plates between the cylinders to complete the closed-loop of load transfer; Whole-process detection system: Use a laser locator to calibrate the axis deviation of the sleeve plates, and use ultrasonic flaw detection to spot-check the weld quality to ensure the structural integrity. Description of the Drawings

[0065] The above description is only an overview of the technical solution of the present invention. In order to be able to more clearly understand the technical means of the present invention and implement it according to the content of the specification, the following details the preferred embodiments of the present invention in conjunction with the drawings as follows.

[0066] Figure 1 It is the overall side view structure diagram of a highway bridge pile foundation reinforcement construction device of the present invention;

[0067] Figure 2 It is the overall top view structure diagram of a highway bridge pile foundation reinforcement construction device of the present invention;

[0068] Figure 3 It is the side view structure diagram of the side cylindrical sleeve plate in a highway bridge pile foundation reinforcement construction device of the present invention;

[0069] Figure 4 It is the top view structure diagram of the side cylindrical sleeve plate in a highway bridge pile foundation reinforcement construction device of the present invention;

[0070] Figure 5 It is the front view structure diagram of the side plate sleeve plate in a highway bridge pile foundation reinforcement construction device of the present invention;

[0071] Figure 6 It is the top view structure diagram of the side plate sleeve plate in a highway bridge pile foundation reinforcement construction device of the present invention;

[0072] Figure 7 It is the side view structure diagram of the side plate sleeve plate in a highway bridge pile foundation reinforcement construction device of the present invention;

[0073] Figure 8 It is the front view structure diagram of the sleeve plate between cylinders in a highway bridge pile foundation reinforcement construction device of the present invention;

[0074] Figure 9 It is the side view structure diagram of the sleeve plate between cylinders in a highway bridge pile foundation reinforcement construction device of the present invention;

[0075] Figure 10This is the top view structure diagram of the cylindrical intermediate sleeve plate in a highway bridge pile foundation reinforcement construction device of the present invention.

[0076] Legend:

[0077] 1. Side cylindrical sleeve plate assembly; 11. Cylindrical panel; 12. Side horizontal flange; 13. Side annular flange; 15. Side vertical flange; 16. Side rib plate; 17. Side vertical rib; 18. Side flange; 19. Side stiffener;

[0078] 2. Side plate sleeve plate assembly; 21. Side plate panel; 22. Side plate horizontal flange; 23. Side plate vertical flange; 24. Side plate horizontal rib; 25. Side plate vertical rib; 26. Side plate rib plate;

[0079] 3. Cylindrical intermediate sleeve plate assembly; 31. Cylindrical intermediate panel; 32. Cylindrical intermediate horizontal flange; 33. Cylindrical intermediate annular flange; 34. Cylindrical intermediate ring rib; 35. Cylindrical intermediate vertical flange; 36. Cylindrical intermediate rib plate; 37. Cylindrical intermediate vertical rib; 38. Cylindrical intermediate flange; 39. Cylindrical intermediate horizontal rib. Specific implementation manner

[0080] In the embodiment of the present application, by providing a construction method for highway bridge pile foundation reinforcement, the problems in the prior art regarding structural design and construction process are solved. The sequential assembly principle: First install the side cylindrical sleeve plate as the main load-bearing unit → butt the side plate sleeve plate for transition → finally connect the cylindrical intermediate sleeve plate to complete the load transfer closed-loop; The whole-process detection system: Use a laser locator to calibrate the axis deviation of the sleeve plate, and use ultrasonic flaw detection to spot-check the weld quality to ensure the structural integrity.

[0081] Embodiment 1

[0082] The technical solution in the embodiment of the present application is to solve the problem of highway bridge pile foundation reinforcement, and the general idea is as follows:

[0083] As Figure 1-2 shown, in view of the problems existing in the prior art, the present invention provides a highway bridge pile foundation reinforcement construction device, including:

[0084] A side cylindrical sleeve plate assembly 1, a side plate sleeve plate assembly 2, and a cylindrical intermediate sleeve plate assembly 3. The side cylindrical sleeve plate assembly 1 realizes the torsional reinforcement of the cylindrical section through a radial grid skeleton and an annular flange; the side plate sleeve plate assembly 2 adopts a two-way bending rib mesh structure to optimize the stress distribution in the plane transition area; the cylindrical intermediate sleeve plate assembly 3 ensures the efficient transfer of multi-directional loads between pile foundations through special-shaped rib plates and annular sealing flanges. The three cooperate to form a modular reinforcement system, improving the load-bearing efficiency and durability of the overall structure.

[0085] As Figure 3-4As shown, the side cylindrical sleeve plate assembly 1 is composed of a cylindrical panel 11 made of an arc-shaped steel plate as a load-bearing base, and a side annular flange 13 is integrally formed on its outer edge along the circumferential direction, and an array of evenly distributed bolt holes is provided on the inner side of the flange; a side transverse flange 12 and a side vertical flange 15 are respectively welded at both axial ends of the cylindrical panel 11 to form a longitudinal docking interface with the adjacent sleeve plate.

[0086] In addition, on the inner surface of the cylindrical panel 11, a plurality of side ribs 16 are welded at equal angles along the circumference, and side vertical ribs 17 are arranged in parallel between every two side ribs 16 to form a radial grid skeleton at intervals of 30 degrees; the side flange 18 is fixed to the bolt hole gap of the side annular flange 13 in an annular array manner, and is obliquely connected to the side vertical ribs 17 through the side reinforcing ribs 19 to form a triangular truss-type torsion-resistant unit, which effectively suppresses the circumferential deformation of the pile foundation under eccentric load.

[0087] like Figure 5-7 As shown, the side panel sleeve assembly 2 uses a rectangular steel plate as the side panel panel 21, and the side panel horizontal flanges 22 are connected to the side panel panel 21 at both ends through a welding process. The side panel vertical flanges 23 are welded at both ends of the side panel panel 21, and a 3mm tolerance gap is reserved at the flange interface to accommodate thermal expansion and contraction during construction.

[0088] In addition, the side panel sleeve assembly 2 includes a bidirectional anti-bending design. On the inner surface of the side panel panel 21, the side panel transverse reinforcement 24 and the side panel vertical reinforcement 25 are orthogonally arranged at a spacing of 200 mm. The intersection of the transverse and vertical reinforcements is welded and fixed by a diamond-shaped side panel reinforcement plate 26 formed by laser cutting to form a honeycomb-like supporting structure. This design enables the side panel sleeve assembly 2 to achieve bidirectional transmission of bending moment through equal strength distribution of transverse and longitudinal reinforcements when subjected to vertical loads, thereby reducing local stress concentration and improving the durability of the pile foundation transition zone structure.

[0089] like Figure 8-10 As shown, the inter-cylindrical panel 31 of the inter-cylindrical sleeve assembly 3 is a semi-cylindrical-flat composite curved steel plate, and both ends of the inter-cylindrical panel 31 are respectively provided with an inter-cylindrical transverse flange 32 and an inter-cylindrical vertical flange 35 for multi-directional connection; two concentric inter-cylindrical annular flanges 33 are arranged on the outer side of the curved surface section of the inter-cylindrical panel 31, and the flanges are annularly reinforced by inter-cylindrical annular ribs 34 with T-sections, so that they can withstand the radial extrusion force of adjacent pile foundations.

[0090] On the inner surface of the inter-cylinder panel 31, inter-cylinder vertical ribs 37 are welded at intervals of 300 mm along the axial direction, and inter-cylinder transverse ribs 39 are arranged in the vertical direction. An X-shaped node is formed at the intersection of the two through the inter-cylinder rib plate 36; an inter-cylinder flange 38 is additionally provided at the flange connection part, and its embedded rubber sealing strip design ensures the connection strength while achieving waterproof and seismic isolation between the pile foundations.

[0091] During construction, the side cylindrical sleeve plate assembly 1, as the main load-bearing unit, wraps the cylindrical section of the pile foundation. Its radially strengthened grid and triangular anti-torsion unit work together to convert the upper load into circumferential compressive stress. The side plate sleeve plate assembly 2 realizes the diffusion of bending and shear stresses through a honeycomb structure at the variable cross-section of the pile foundation. The cylindrical inter-sleeve plate assembly 3 decomposes the interaction forces between adjacent pile foundations into axial and circumferential components through a spatial force transmission system. The three sleeve plate assemblies are connected by a flange bolt group to form a continuous force-bearing system, enhancing the overall lateral stiffness.

[0092] A construction method for strengthening and constructing a highway bridge pile foundation is as follows:

[0093] I. Construction preparation stage

[0094] Step 1: Prefabrication and processing of sleeve plates

[0095] Cut the materials by laser according to the design drawings, and control the dimensional errors of the side cylindrical sleeve plate assembly 1, the side plate sleeve plate assembly 2, and the cylindrical inter-sleeve plate assembly 3.

[0096] Step 2: All flange connection holes are formed by numerical control stamping process:

[0097] Vertical flanges 15 / 23 / 35: Open stamping long holes with a length of 50 mm and a width of 24 mm, and the deviation of the center distance of the hole positions ≤ 1 mm.

[0098] Horizontal / ring flanges 12 / 13 / 22 / 33: Open Φ24 standard round holes and reserve the tolerance of the positioning pin holes for H8 / h7 fit.

[0099] Step 3: Pre-control of welding quality

[0100] The stiffeners 16 / 24 - 26 / 34 - 39 that are not flange-connected are welded by CO 2 gas shielded welding, and the weld leg height ≥ 60% of the steel plate thickness;

[0101] The welding sequence follows "symmetric welding from the inside to the outside". After completion, use a 3 m straightedge to detect the flatness of the inner wall of the cylinder, and grind the uneven parts to ≤ 1.5 mm / m.

[0102] II. Construction process of sleeve plate assembly

[0103] Reinforcement of the side cylindrical section

[0104] Step 1: Wrap the side cylindrical sleeve plate assembly 1 around the cylindrical surface of the pile foundation, and achieve circumferential precise positioning by inserting the positioning pin plate into the pin holes of the side ring flange 13.

[0105] Step 2: Pre-tighten the bolts of the side horizontal flange 12 and the adjacent sleeve plates, and increase the torque in three increments to 220 N·m.

[0106] Step 3: Inject epoxy mortar into the gap between the internal radial rib net 16 / 17 and the pile foundation surface, and form a composite torsion-resistant structure layer after curing.

[0107] Reinforcement of the plane transition zone

[0108] Step 1: Install the side plate sleeve assembly 2 at the variable cross-section of the pile foundation. Align the stamping long holes of the vertical flange 23 of the side plate with the pile foundation embedded parts, allowing a thermal displacement compensation of ±15 mm;

[0109] Step 2: Fix the horizontal rib 24 and the vertical rib 25 of the side plate by high-frequency welding to form a honeycomb support system;

[0110] Step 3: After the weld passes the ultrasonic flaw detection, the defect rate < 0.2%. Inject polyurethane filling glue at the intersection nodes of the rib plates for sealing.

[0111] Reinforcement of the connection between pile foundations

[0112] Step 1: Align the circumferential annular flange 33 between the cylinders of the sleeve assembly 3 between cylinders with the sleeve flange of the adjacent pile foundation, and insert the positioning pin plate to lock the axial position;

[0113] Step 2: Pre-press the rubber sealing strip before installing the rib plate 36 between cylinders to ensure that the waterproof performance at the flange connection ≤ 0.01 L / (m 2 ·h);

[0114] Step 3: Pour high-strength concrete into the gap between the X-shaped node rib plates 37 / 39 and the pile foundation, and form a spatial force transmission framework after curing.

[0115] Beneficial effects:

[0116] I. Side cylinder sleeve assembly 1

[0117] Technical effects: Improve the torsional stiffness and circumferential bearing capacity of the cylindrical section of the pile foundation.

[0118] Corresponding components:

[0119] Radial grid framework: A radial support system formed by welding the side rib plate 16 and the side vertical rib 17 at an interval of 30°, which converts eccentric load into uniform circumferential stress;

[0120] Triangular torsion-resistant unit: The side flange 18 is obliquely connected to the side vertical rib 17 through the side reinforcing rib 19 to form a truss-type anti-deformation structure.

[0121] Association with construction method:

[0122] Precise assembly of positioning pins: Insert the positioning pin plate into the positioning pin holes of the side circumferential flange 13 to ensure the circumferential alignment accuracy when the sleeve covers the pile foundation;

[0123] Phased bolt pre - tightening: The lateral flange 12 and the adjacent sleeve plate are connected by three times of increasing torque for initial tightening → medium tightening → final tightening, avoiding bolt stress relaxation.

[0124] II. Side plate sleeve plate assembly 2

[0125] Technical effect: Optimize the bending and shear stress distribution in the variable cross - section area of the pile foundation, preventing local fatigue cracking.

[0126] Corresponding components:

[0127] Honeycomb - shaped support structure: The horizontal ribs 24 of the side plate and the vertical ribs 25 of the side plate are arranged orthogonally and welded into an equal - strength force - transfer grid through the diamond - shaped side - plate rib plates 26;

[0128] Dynamic compensation design: The stamping long holes on the vertical flange 23 of the side plate allow a thermal expansion and contraction displacement of ±15 mm.

[0129] Construction method correlation:

[0130] High - frequency welding process: Use CO 2 Gas - shielded welding is used to continuously weld the rib - plate joints to ensure the consistency of the weld penetration depth;

[0131] Filling glue sealing: Inject polyurethane colloid at the intersection of rib plates to seal the welding micropores and enhance the anti - leakage performance.

[0132] III. Cylindrical - space sleeve plate assembly 3

[0133] Technical effect: Achieve efficient transfer of multi - directional loads and waterproof and seismic isolation between adjacent pile foundations.

[0134] Corresponding components:

[0135] Spatial force - transfer framework: The vertical ribs 37 between cylinders and the horizontal ribs 39 between cylinders are connected by X - shaped inter - cylindrical rib plates 36 to form a three - dimensional force - flow transfer path;

[0136] Sealing flange structure: The flange 38 between cylinders is embedded with a rubber sealing strip to block the penetration of water and soil and buffer vibration impact.

[0137] Construction method correlation:

[0138] Pre - pressing sealing process: Pre - press the rubber strip in the flange groove to a compression rate of 30% before installation to ensure the tightness at the interface;

[0139] Composite perfusion reinforcement: Synchronously pour high - strength concrete and epoxy resin into the rib - plate gaps to form a "steel - concrete" composite force - transfer medium.

[0140] IV. Technical effects of coordinated construction

[0141] Technical effect: The modular assembly system improves the overall construction efficiency and structural reliability.

[0142] Linkage of core components:

[0143] The dowel plate is universal across components: The flange holes of the three plates all use a unified specification dowel pin with a new label 4 to achieve quick alignment;

[0144] Standardization of bolt group connection: All flange bolt holes are designed according to ISO standards to be compatible with cross-connections between different plates.

[0145] Coordination of construction process:

[0146] Principle of sequential assembly: First install the side cylindrical plate 1 as the main load-bearing unit → butt the side plate 2 for transition → finally connect the cylindrical intermediate plate 3 to complete the load transfer loop;

[0147] Full-process inspection system: Use a laser locator to calibrate the axis deviation of the plates and use ultrasonic flaw detection to spot-check the weld quality to ensure the structural integrity.

[0148] Finally, it should be noted that: Obviously, the above embodiments are only examples for clearly illustrating the present invention and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A construction method for reinforcing the pile foundation of a highway bridge, characterized in that: include: The side cylinder sleeve assembly (1), the side plate sleeve assembly (2) and the inter-cylinder sleeve assembly (3) are characterized in that the side cylinder sleeve assembly (1) realizes the anti-torsion reinforcement of the cylinder section through a radial grid skeleton and an annular flange; the side plate sleeve assembly (2) adopts a bidirectional anti-bending rib mesh structure to optimize the stress distribution in the plane transition zone; the inter-cylinder sleeve assembly (3) ensures the efficient transmission of multi-directional loads between pile foundations through special-shaped ribs and annular sealing flanges.

2. A highway bridge pile foundation reinforcement construction device according to claim 1, characterized in that: The side cylindrical sleeve assembly (1) is composed of a cylindrical panel (11) made of an arc-shaped steel plate as a load-bearing base, and a side annular flange (13) is integrally formed on its outer edge along the circumferential direction, and an array of bolt holes evenly distributed is provided on the inner side of the flange; the axial ends of the cylindrical panel (11) are respectively welded with a side transverse flange (12) and a side vertical flange (15) to form a longitudinal docking interface with an adjacent sleeve.

3. A highway bridge pile foundation reinforcement construction device according to claim 1, characterized in that: The side plate sleeve assembly (2) uses a rectangular steel plate as the side plate panel (21), the two lateral ends of the side plate panel (21) are connected to the side plate lateral flanges (22) by a welding process, and the two vertical ends of the side plate panel (21) are welded to the side plate vertical flanges (23).

4. A highway bridge pile foundation reinforcement construction device according to claim 1, characterized in that: The inter-cylinder panel (31) of the inter-cylinder sleeve assembly (3) is a semi-cylindrical-flat composite curved steel plate, and both ends of the inter-cylinder panel (31) are respectively provided with an inter-cylinder transverse flange (32) and an inter-cylinder vertical flange (35) for multi-directional connection; two concentric inter-cylinder annular flanges (33) are arranged on the outer side of the curved surface section of the inter-cylinder panel (31), and the flanges are annularly reinforced by inter-cylinder annular ribs (34) with T-shaped cross-sections.

5. A highway bridge pile foundation reinforcement construction device according to claim 2, characterized in that: On the inner surface of the cylindrical panel (11), a plurality of side rib plates (16) are welded at equal angles along the circumference, and side vertical ribs (17) are arranged in parallel between every two side rib plates (16) to form a radial grid skeleton at intervals of 30 degrees; the side flange (18) is fixed to the bolt hole gap of the side annular flange (13) in an annular array manner, and is obliquely connected to the side vertical ribs (17) through side reinforcing ribs (19) to form a triangular truss-type torsion-resistant unit.

6. A highway bridge pile foundation reinforcement construction device according to claim 3, characterized in that: In addition, the side panel sleeve assembly (2) includes a bidirectional bending resistance design. On the inner surface of the side panel panel (21), side panel transverse ribs (24) and side panel vertical ribs (25) are orthogonally arranged at a spacing of 200 mm, and the intersection of the transverse and vertical ribs is welded and fixed by a diamond-shaped side panel rib plate (26) formed by laser cutting.

7. A highway bridge pile foundation reinforcement construction device according to claim 4, characterized in that: On the inner surface of the inter-cylinder panel (31), inter-cylinder vertical ribs (37) are welded at intervals of 300 mm along the axial direction, and inter-cylinder transverse ribs (39) are arranged in the vertical direction. The intersection of the two forms an X-shaped node through the inter-cylinder rib plate (36); and an inter-cylinder flange (38) is additionally provided at the flange connection portion.

8. A construction method for reinforcing a highway bridge pile foundation according to claim 1, characterized in that: The specific steps are as follows: Construction preparation stage Step 1: Prefabrication of the sleeve plate: Laser cutting and blanking according to the design drawings to control the dimensional errors of the side cylinder sleeve plate assembly (1), the side plate sleeve plate assembly (2), and the inter-cylinder sleeve plate assembly (3); Step 2: All flange connection holes are formed by CNC stamping process: vertical flange (15 / 23 / 35): open a 50mm long × 24mm wide punched hole, the hole center distance deviation is ≤1mm; horizontal / annular flange (12 / 13 / 22 / 33): open a Φ24 standard round hole, and reserve a positioning pin hole (tolerance H8 / h7 fit); Step 3: Pre-control of welding quality. For the ribs (16 / 24-26 / 34-39) without flange connection, CO2 gas shielded welding is adopted. The height of the weld leg is ≥ 60% of the thickness of the steel plate. The welding sequence follows "symmetrical welding from the inside to the outside". After completion, the flatness of the inner wall of the cylinder is checked with a 3m ruler, and the uneven parts are polished to ≤1.5mm / m.

9. A construction method for reinforcing a highway bridge pile foundation according to claim 8, characterized in that: The specific steps are as follows:

2. Side cylindrical segment reinforcement Step 1: Cover the cylindrical surface of the pile foundation with the side cylindrical sleeve assembly (1), and insert the positioning pin plate into the pin hole of the side annular flange (13) to achieve precise circumferential positioning; Step 2: Bolt pre-tighten the side transverse flange (12) and the adjacent sleeve plate, and increase the torque to 220 N·m three times; Step 3: Pour epoxy mortar into the gap between the internal radial reinforcement mesh (16 / 17) and the pile foundation surface, and form a composite torsion-resistant structural layer after curing.

10. A construction method for reinforcing a highway bridge pile foundation according to claim 9, characterized in that: The specific steps are as follows:

3. Reinforcement of plane transition zone, Step 1: Install the side plate sleeve assembly (2) at the variable cross-section of the pile foundation, align the punched long hole of the side plate vertical flange (23) with the pile foundation embedded part, and allow ±15mm thermal displacement compensation; Step 2: Use high frequency welding to fix the side panel transverse ribs (24) and the side panel vertical ribs (25) to form a honeycomb support system; Step 3: After the weld passes the ultrasonic flaw detection (defect rate < 0.2%), inject polyurethane filling glue to seal the intersection of the ribs.

4. Reinforcement of connections between pile foundations. Step 1: Align the inter-cylinder annular flange (33) of the inter-cylinder sleeve assembly (3) with the adjacent pile foundation sleeve flange, and insert a positioning pin plate to lock the axial position; Step 2: Before installing the inter-cylinder rib plate (36), pre-tighten the rubber seal strip to ensure that the waterproof performance of the flange connection is ≤0.01L / (m 2 h); Step 3: Pour high-strength concrete into the gap between the X-shaped node rib plate (37 / 39) and the pile foundation, and form a spatial force transmission skeleton after solidification.

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