CN-121976480-A - Quick bridge deck pavement reinforcing method based on UHPC-steel mesh composite layer

CN121976480ACN 121976480 ACN121976480 ACN 121976480ACN-121976480-A

Abstract

The invention discloses a quick bridge deck pavement reinforcing method based on a UHPC-steel mesh composite layer, and belongs to the technical field of bridge engineering reinforcement. The invention combines a scientific disease grading evaluation system with a key part association analysis to optimize the reinforcing range, accurately matches the reinforcing requirements of different disease areas, combines a basal plane treatment, a steel mesh positioning and a UHPC material modification process, strengthens the cooperative stress of a composite layer, an original base layer and a steel mesh, combines the UHPC material and modified steel fibers, improves the impermeability, corrosion resistance and mechanical property uniformity of the composite layer, prolongs the service period of the bridge deck, obviously improves the bearing performance and breakage resistance of the bridge deck, simultaneously combines a layered pouring and adaptive vibrating process with a steam rapid maintenance technology, greatly shortens the construction and maintenance period, reduces the interference to traffic, reduces the later repair rate by a precise detection and management process, reduces the maintenance investment, and realizes the balance of the reinforcing effect and economic benefit.

Inventors

HONG YINGWEI
CHEN YIYUAN
WANG WEI

Assignees

江西现代职业技术学院

Dates

Publication Date: 20260505
Application Date: 20260205

Claims (10)

1. The quick bridge deck pavement reinforcing method based on the UHPC-steel mesh composite layer is characterized by comprising the following steps of: The detection of the paving structure comprises the steps of comprehensively detecting the original bridge deck paving layer of the bridge, determining the disease grade and the reinforcement operation range of the paving layer according to the detection result, and marking a target area to be cleaned and repaired; Positioning the steel mesh, namely performing basal plane treatment on the determined reinforcement operation range, cutting the steel mesh according to the size of the reinforcement operation range, and fixing the steel mesh paved on the basal plane by adopting a positioning piece; The UHPC material is prepared by weighing corresponding raw materials according to a preset mixing proportion, putting the raw materials into stirring equipment for graded stirring until the UHPC material meets the preset index requirement, and completing the preparation of the UHPC material; Pouring and forming the composite layer, namely pouring the prepared UHPC material above and around a fixed steel net in a layered manner, vibrating the poured UHPC material by adopting vibrating equipment, and leveling and polishing the paved surface after the vibration is finished to form a UHPC-steel net composite layer; And (3) quality detection, namely carrying out quality detection on the UHPC-steel mesh composite layer, detecting the interface bonding strength of the composite layer and the original pavement base layer, finishing rapid reinforcement of bridge deck pavement if detection indexes meet the preset reinforcement technical requirement, and carrying out repair treatment on the area if the area with unqualified detection indexes exists, and then re-detecting until all detection indexes meet the requirement.
2. The quick strengthening method for bridge deck pavement based on the UHPC-steel mesh composite layer as recited in claim 1, wherein the step of determining the pavement disease level comprises the following steps: classifying and sorting the detection data, namely classifying and counting the detection data of the original bridge deck pavement layer of the bridge, removing invalid detection data and generating a detection data set of each detection point of the pavement layer; Single-index disease grade judgment, namely establishing a corresponding disease grading standard for each detection index based on a detection data set, and grading single disease types of paving layers corresponding to each detection index respectively, wherein the single disease types are slightly, moderately and severely graded; And (3) comprehensively evaluating the disease grades of the paving layer, namely comprehensively weighting and evaluating the influence weight of the disease type on the paving layer according to the single index disease grade of each detection point, and integrally dividing the paving layer into three comprehensive disease grades.
3. The rapid bridge deck pavement reinforcement method based on the UHPC-steel mesh composite layer as claimed in claim 2, wherein the determination of the reinforcement operation range further comprises: acquiring the association relation between the defined reinforcement operation range and the key part of the original pavement layer of the bridge, determining the construction operation allowance of the reinforcement operation range by combining the construction process requirements of the key part, and simultaneously carrying out local correction and boundary optimization on the reinforcement operation range to determine the optimized reinforcement operation range; and carrying out contour marking on the bridge deck based on the optimized reinforcing operation range, and simultaneously, independently marking key disease parts in the reinforcing operation range.
4. The quick strengthening method for bridge deck pavement based on the UHPC-steel mesh composite layer as claimed in claim 1, wherein the base surface treatment comprises roughening treatment by adopting a mechanical shot blasting mode, the shot blasting depth is controlled to be 2-3mm, the roughness of the base surface reaches 4-6 mu m, the steel mesh adopts a steel bar welded mesh, the diameter of the steel bar is 6-8mm, the mesh size is 100mm multiplied by 150mm, the lap joint length of the cut steel mesh is not less than 2 mesh side lengths, the lap joint position is fixed by adopting spot welding, the positioning piece adopts a high-strength expansion bolt, the distance is 500-800mm, and the reserved gap between the steel mesh and the base surface is set in a range of 20-30 mm.
5. The rapid bridge deck pavement reinforcing method based on the UHPC-steel mesh composite layer as set forth in claim 1, wherein the UHPC material is prepared, and further comprising: The preset mixing ratio is 400-450 parts of cement, 80-100 parts of silica fume, 600-650 parts of superfine quartz sand, 120-150 parts of steel fiber, 8-12 parts of high-efficiency water reducer and 160-180 parts of water according to parts by weight; in the preparation process of the UHPC material, cement, silica fume and superfine quartz sand are subjected to dry mixing, then added with a high-efficiency water reducing agent and water for wet mixing, and added with steel fibers for low-speed stirring after the wet mixing; Wherein, the dry mixing time is 2-3min, the wet mixing time is 4-5min, the temperature of the material is controlled to be 15-25 ℃ in the stirring process, the low-speed stirring time is 5-8min, and the expansion degree of the UHPC material is detected after the stirring is completed.
6. The quick strengthening method for bridge deck pavement based on the UHPC-steel mesh composite layer, as claimed in claim 5, is characterized in that the UHPC material is prepared, the method further comprises the steps of modifying the steel fiber, soaking the steel fiber in a silane coupling agent solution with the mass fraction of 3% -5% for 20-30min, placing the soaked steel fiber in an oven with the temperature of 80-100 ℃ for drying to constant weight, and forming a silane coating layer on the surface of the modified steel fiber.
7. The rapid bridge deck pavement reinforcing method based on the UHPC-steel mesh composite layer as claimed in claim 1, wherein the layered pouring comprises the following steps: Pouring UHPC material to the bottom of the steel mesh, vibrating along the mesh gaps of the steel mesh by adopting an inserted vibrator, wherein the vibrating frequency is controlled to be 200-300 times/min, and the vibrating time is 30-60s each time until the surface of the slurry is free from bubbling and shows a slurry-flooding state; And pouring the second layer, namely pouring the second layer after the first layer is vibrated to the preset total thickness of the composite layer, vibrating the composite layer longitudinally along the bridge deck at a constant speed by adopting a flat plate vibrator, wherein the vibrating speed is controlled to be 1-1.5m/min.
8. The quick bridge deck pavement reinforcing method based on the UHPC-steel mesh composite layer, as set forth in claim 7, is characterized in that the composite layer is cast and formed, and further comprises the steps of monitoring the position of the steel mesh in real time during casting, collecting steel mesh plane displacement and vertical deformation data in real time, synchronously monitoring the stress strain condition of the steel mesh, and immediately stopping casting and adjusting and fixing if the steel mesh displacement or deformation exceeds a preset early warning threshold value.
9. The quick strengthening method for bridge deck pavement based on the UHPC-steel mesh composite layer, as set forth in claim 8, is characterized in that when the layer casting is performed, the casting thickness of each layer is 50-80mm, the interval time between two adjacent layers is not more than 30min, after the second layer casting is completed, a mechanical troweling machine is adopted to be matched with manual leveling and polishing, the rotating speed of the troweling machine is 150-200r/min, the deviation of the surface flatness of the pavement after polishing is not more than 2mm/m, and no obvious troweling mark and bubble mark exist on the surface.
10. The rapid bridge deck pavement reinforcing method based on the UHPC-steel mesh composite layer is characterized by further comprising the steps of detecting distribution of steel fibers in the UHPC, scanning the surface of the composite layer at a constant speed through an ultrasonic probe, positioning the steel mesh position and marking, dividing a steel mesh-free detection area, scanning the steel mesh-free detection area by adopting an inductance detection device based on detection results, detecting the content and distribution state of the steel fibers in the steel mesh-free detection area, and analyzing deviation and uniformity of the content and distribution of the steel fibers.

Description

Quick bridge deck pavement reinforcing method based on UHPC-steel mesh composite layer Technical Field The invention relates to the technical field of bridge engineering reinforcement, in particular to a quick bridge deck pavement reinforcement method based on a UHPC-steel mesh composite layer. Background The existing bridge deck pavement reinforcing method is mostly repaired by adopting common concrete pouring, asphalt paving or single fiber reinforced material, and has the problems of poor bonding performance, limited bearing capacity improvement, long construction period, insufficient durability and the like. For example, china patent application with publication number CN119434136A discloses a concrete bridge deck reinforcing structure and a construction method thereof, the concrete bridge deck reinforcing structure comprises an original concrete bridge deck and a paving layer arranged at the top of the original concrete bridge deck, wherein the paving layer is made of light ultra-high performance concrete, reinforcing steel bar layers are arranged in the original concrete bridge deck and the paving layer, hooking reinforcing steel bars are used for connecting the reinforcing steel bar layers in the original concrete bridge deck and the paving layer, prestress grooves are arranged at equal intervals along the bridge direction, the prestress grooves are arranged along the transverse bridge direction, and a set of prestress bars are arranged in the prestress grooves. The patent application takes light ultra-high performance concrete as a cover surface, and hook-connection steel bars are arranged between an original concrete bridge deck and a new pavement layer. Meanwhile, prestress is applied between the paving layer and the original bridge roof, so that the bending rigidity of the concrete slab structure is enhanced, the whole bridge structure is stressed together, and the durability and the driving safety of the structure are improved. However, the above patent has the following problems, although it improves the bending and cracking resistance of the bridge: 1. in the prior art, a disease grading evaluation system of a system is not established, the reinforcement range is not accurately divided for bridge deck pavement diseases of different degrees and different types, the situation that excessive reinforcement or partial disease treatment is not thorough easily occurs, and the accuracy of reinforcement according to needs is difficult to realize; 2. The prior art has complex construction flow, the opening of the prestress groove, the arrangement and the tensioning of the prestress rib have extremely high requirements on construction precision, the installation of the hooking steel bar needs to go deep into the original bridge deck, secondary damage is easily caused to the original structure, the whole process steps are complicated, the construction period is longer, the disturbance to traffic is larger, and the rapid reinforcement and the traffic recovery are difficult to realize; 3. The prior art has insufficient suitability for complicated parts such as bridge deck corners, expansion joints and the like, and is difficult to ensure the packing compactness and the structural integrity of special areas. Disclosure of Invention The invention aims to provide a quick bridge deck pavement reinforcing method based on a UHPC-steel mesh composite layer, which is characterized in that the requirements of different areas are matched through accurate disease grading evaluation and reinforcing range optimization, the construction period is shortened through a layered pouring and steam curing technology, traffic interference is reduced, the reinforcement of complex parts is adapted, the corrosion resistance and breakage resistance of the composite layer are enhanced through the synergistic effect of UHPC materials and modified steel fibers, and the service period is prolonged, so that the problems in the background art are solved. In order to achieve the above purpose, the present invention provides the following technical solutions: A bridge deck pavement rapid reinforcement method based on a UHPC-steel mesh composite layer comprises the following steps: The detection of the paving structure comprises the steps of comprehensively detecting the original bridge deck paving layer of the bridge, determining the disease grade and the reinforcement operation range of the paving layer according to the detection result, and marking a target area to be cleaned and repaired; Positioning the steel mesh, namely performing basal plane treatment on the determined reinforcement operation range, cutting the steel mesh according to the size of the reinforcement operation range, and fixing the steel mesh paved on the basal plane by adopting a positioning piece; The UHPC material is prepared by weighing corresponding raw materials according to a preset mixing proportion, putting the raw materials into stirring equipment for graded s