A quick treatment construction method for bumping phenomenon of bridge expansion joint position

Abstract

The application discloses a kind of bridge expansion joint position bumping phenomenon's quick handling construction method. Including step 1) measuring elevation: the elevation of the steel of bridge expansion joint two sides and the elevation of two sides asphalt surface are measured respectively, and the repair height of anchoring area is calculated;Step 2) base cleaning: the surface of the anchoring area (2) to be repaired is polished and cleaned;Step 3) formwork is set on the two sides of expansion joint, and movable angle steel is installed according to the repair height obtained in step 1);Step 4) deploy fast hard mortar;Step 5) the mortar is smoothed on the surface of the anchoring area (2) to be repaired, and is cured;Step 6) remove formwork;Step 7) restore traffic.The application not only can improve the bumping phenomenon on the two sides of expansion joint, improve driving safety and comfort, but also can repair the local damaged concrete of expansion joint anchoring area, prolong the service life of expansion joint.

Description

Technical Field

[0001] This invention relates to the field of bridge maintenance and reinforcement, specifically to a rapid treatment method for vehicle bouncing at bridge expansion joints. Background Technology

[0002] Differential settlement on both sides of bridge expansion joints causes unevenness at the bridge abutments, leading to vehicle bouncing. This bouncing can damage the expansion joint anchorage and even the expansion joint assembly itself, compromising driver safety and comfort. Typically, repairs to the entire expansion joint anchorage require complete removal, incurring significant highway maintenance costs. This often prevents the expansion joint anchorage from being repaired, causing the steel components of the expansion joint to fracture due to prolonged neglect, greatly increasing traffic hazards. Given the increasingly heavy traffic loads on highways, a rapid repair technology for addressing vehicle bouncing at bridge expansion joints is urgently needed. Summary of the Invention

[0003] To address the problems in the background art, this invention proposes a rapid construction method for handling vehicle bouncing at bridge expansion joints. This method not only improves vehicle bouncing on both sides of the expansion joint, enhancing driving safety and comfort, but also repairs locally damaged concrete in the expansion joint anchorage zone, extending the service life of the expansion joint.

[0004] The technical solution adopted in this invention is as follows:

[0005] I. A rapid construction device for addressing vehicle bouncing at bridge expansion joint locations

[0006] Includes template support, template, movable angle steel, first screw and second screw;

[0007] The expansion joint device is fixed on both sides by concrete anchorage zones. The bridge roadway is located on both sides of the anchorage zones, and the surface is asphalt. Template supports are fixed on the asphalt surface on both sides. Two vertically arranged templates are installed on both sides of the expansion joint, and the templates are arranged along the extension direction of the expansion joint. Two movable angle steels are respectively provided on the outer side of the bottom of the two templates, and the movable angle steels extend horizontally along the extension direction of the expansion joint. The two templates are fixed by a first screw and a second screw located at the top and bottom. The two ends of the first screw pass through the two templates respectively and are connected to the template supports on both sides by bolts. The two sides of the second screw are used to connect the movable angle steel and the template respectively.

[0008] The inner side of the template is vertically arranged with multiple fixed angle steels for supporting the template; the template surface is arranged with multiple vertical through holes; the first screw and the second screw pass through the top and bottom of the vertical through holes respectively and are fixedly connected by bolts; the first screw and the second screw are adjusted in position by moving up and down along the vertical through holes.

[0009] II. A rapid construction method for handling vehicle bouncing at bridge expansion joints

[0010] Includes the following steps:

[0011] Step 1) Measure the elevation: Measure the elevation of the steel sections on both sides of the bridge expansion joint and the elevation of the asphalt surface on both sides respectively, and calculate the repair height of the anchorage zone;

[0012] Step 2) Base cleaning: Grind and clean the surface of the anchorage area to be repaired;

[0013] Step 3) Erect formwork on both sides of the expansion joint and install movable angle steel according to the repair height obtained in Step 1);

[0014] Step 4) Prepare the quick-setting mortar;

[0015] Step 5) Apply mortar to the surface of the anchorage area to be repaired and allow it to cure;

[0016] Step 6) Remove the formwork;

[0017] Step 7) Resume traffic.

[0018] Step 1) specifically refers to:

[0019] 1.1) Take measuring points on the steel profile and asphalt surface on both sides of the expansion joint:

[0020] Mark the multiple intersection points between the lane markings on the asphalt surface and the expansion joint anchorage area as the first measuring points and set their elevations; mark the multiple intersection points between the extension lines of the lane markings and the steel sections on the expansion joint device as the second measuring points and set their elevations.

[0021] 1.2) After connecting the first measuring points on both sides of the asphalt surface, the repair surface of the anchorage zone is obtained by fitting. The repair height of the anchorage zone is calculated based on the repair surface. The amount of mortar used in the anchorage zone is estimated based on the height difference between the repair height and the second measuring point.

[0022] Step 2) specifically refers to:

[0023] Grinding the concrete in the anchorage area can increase the adhesion between the concrete and the repair mortar. Equipment such as grinding wheel grinders and shot blasting machines can be used for this purpose. After grinding, keep the concrete surface clean.

[0024] Step 2) is used to remove oil stains and increase surface roughness.

[0025] Step 3) specifically involves: first, placing the template support on the asphalt surface on both sides of the expansion joint; then, using the first screw to initially fix the template from the top; then, marking the repair height obtained in step 1) on the template so that the bottom surface of the movable angle steel is flush with the surface to be leveled, i.e., the repair height; and then connecting the movable angle steel to the template using the second screw; finally, fixing the second screw and the first screw by tightening the bolts.

[0026] The rubber waterproof layer of the expansion joint device should not be damaged during the formwork erection process.

[0027] A release agent is applied to the outer side of the template, i.e., the side closest to the anchorage area. The template is made of a supportive steel plate. The extension length of the template is adapted to the lane width. The number of template supports and bolts is adjusted according to the lane width to meet the template support requirements. The expansion joint device is composed of steel sections and is fixed on both sides by concrete anchorage areas. The bottom outer sides of the two templates abut against the top inner sides of the steel sections on both sides of the expansion joint device.

[0028] In step 5): the well-mixed mortar mixture is laid on the cleaned concrete surface of the anchoring area and smoothed according to the position of the movable angle steel. The smoothing is completed before the mortar initially sets, so that the top surface of the mortar is flush with the bottom surface of the movable angle steel.

[0029] Avoid watering and excessive vibration before the mortar is smoothed out, and allow it to set completely. Construction should be avoided in case of sudden rain.

[0030] The time for room temperature conditioning should not be less than 2 hours.

[0031] In step 6), after the mortar strength reaches 80% of the design strength, the formwork is removed. First, the lower bolts are loosened, and then the formwork and support are removed.

[0032] The beneficial effects of this invention are:

[0033] (1) Compared with the large-scale removal and repair of concrete in the anchorage zone, the construction process of the present invention is convenient. Only the loose area of ​​the original interface needs to be removed and cleaned before the quick repair mortar described in the present invention can be applied. After a short curing period, the road can be reopened to traffic.

[0034] (2) The present invention can quickly deal with the phenomenon of vehicle jumping in the expansion joint area, protect the expansion joint device from damage during construction, and make the two sides of the expansion joint smooth after construction. The expansion joint repaired by the method of the present invention can effectively reduce the impact of vehicles on the expansion joint device.

[0035] (3) Compared with the expansion joints that have not been treated, the expansion joint area treated by the present invention is relatively smooth, the vehicle jumping phenomenon is significantly reduced, the impact of vehicle jumping on the concrete of the anchorage area is reduced, the driving comfort can be effectively improved, and the service life of the expansion joint device can be extended.

[0036] (4) The construction device of this invention can be used to construct the expansion joint device in a quantitative manner, and at the same time, it can avoid damage to the expansion joint device caused by the rapid repair mortar entering the expansion joint device. Overall, it is beneficial to improve the construction quality.

[0037] (5) After construction is carried out using the method of the present invention, the impact on the existing traffic is minimal. No mechanical equipment or construction tools are required, and it has the characteristics of lightweight construction that allows for construction while traffic is open. Attached Figure Description

[0038] Figure 1 This is the overall layout diagram of the present invention.

[0039] Figure 2 This is a layout diagram of the template system of the present invention.

[0040] Figure 3 This is a front view of the template of the present invention.

[0041] Figure 4 This is a back view of the template of the present invention.

[0042] Figure 5 This is a diagram of the template support of the present invention.

[0043] Figure 6 This is a schematic diagram of the bridge expansion joint location measuring point arrangement according to the present invention.

[0044] In the diagram: 1. Asphalt surface; 2. Expansion joint anchorage zone; 3. Quick repair mortar after construction; 4. Construction formwork support system; 5. Expansion joint device. Detailed Implementation

[0045] The specific embodiments of the present invention will be described below with reference to specific examples. These examples are only used to illustrate the present invention in detail and do not limit the scope of the present invention in any way. Specific Implementation

[0046] (1) Measuring elevation

[0047] In step (1), the elevations of the steel components on both sides of the bridge expansion joint and the asphalt pavement layer of the driving lane are measured respectively, such as Figure 1As shown, six points are measured on one side of each bridge expansion joint, including two measuring points on the two lane markings located on the asphalt pavement near the concrete of the anchorage zone, two measuring points on the asphalt pavement where the two lane markings intersect with the concrete, and two measuring points on the extension lines of the two lane markings to the steel components of the expansion joint device. The elevation of the measuring points is recorded, and the elevation measurement results should be accurate to 0.1 mm. The height difference between the concrete of the anchorage zone and the asphalt pavement is calculated using the interpolation method, which is the height of the repair mortar that needs to be added.

[0048] (2) Grassroots cleanup

[0049] In step (2), the concrete anchorage area is ground to increase the adhesion between the concrete in the anchorage area and the repair mortar. Equipment such as grinding wheel grinder and shot blasting machine can be used for this process. After the process is completed, there should be no other debris on the concrete interface.

[0050] (3) Vertical formwork inside the expansion joint

[0051] like Figure 1 As shown, in step (3), the sides of the templates erected on both sides of the expansion joint device should be coated with a release agent. The templates should be made of steel plates with support, and the rubber waterproof layer of the expansion joint device should not be damaged during the construction and erection of the templates. When erecting the templates, the template supports should first be erected on both sides of the expansion joint device, and a special screw should be passed through the template positioning hole 412. The template should be initially fixed by the first screw (without tightening the bolts). Then, mark the template according to the height difference obtained in step 1, so that the bottom surface of the angle steel 413 is flush with the surface to be leveled. Then adjust the second screw to make the template vertical and secure, and tighten the upper and lower bolts to complete the fixation.

[0052] (4) Mixing mortar

[0053] In step (4), the mortar used is a fast-setting mortar, which can be fully mixed with water on site according to the specified ratio. It has the characteristic of requiring no curing under normal conditions, with a compressive strength of not less than 30~50 MPa after 2 hours, a tensile strength bonded to the original concrete of not less than 1.5 MPa, and low shrinkage properties. During concrete construction, construction should be avoided on rainy days.

[0054] (5) Smooth the mortar and cure it.

[0055] In step (5), the mortar should have good workability. The well-mixed mortar mixture is laid on the clean concrete surface of the anchoring area and smoothed. Smoothing should be completed before the mortar initially sets, and the top surface of the mortar should be flush with the bottom surface of the angle steel. After the mortar is smoothed, avoid watering for curing and avoid large vibrations until the mortar is fully set. Construction should be avoided if there is a sudden rain.

[0056] (6) Remove the formwork

[0057] In step (6), when the formwork is removed, the mortar strength must reach 80% of the design strength. Unless otherwise specified, the curing time at room temperature shall not be less than 2 hours. When removing the formwork, first loosen the lower bolts one by one, and then remove the formwork and the support.

[0058] (7) Resumption of traffic.

[0059] In specific implementation, for cases where the original anchorage zone 2 concrete is damaged, before treatment or before applying high-performance rapid repair mortar, a mechanical chisel must be used to remove the damaged or detached concrete in the anchorage zone of the expansion joint device, ensuring that the concrete in the anchorage zone is free of loose, floating, or detached particles. The depth of chiseling should be sufficient to completely expose new concrete. After cleaning the chiseled area, measurements should be taken according to the method of this invention.

[0060] After the concrete in the anchorage area on both sides of the expansion joint device is removed by chiseling, it should be cleaned with an air blower. For areas with cracks, select the square area where the crack is located and use a grinding device to grind away 3mm-5mm of concrete.

[0061] In specific implementation, such as Figures 2-5 As shown, when erecting the formwork, the formwork supports 45 should first be placed on both sides of the expansion joint device, with no less than two formwork supports 45 on each side. To ensure the rigidity of the formwork supports 45, the distance between the supports and the centerline of the expansion joint device should not exceed 1.5m. The formwork supports 45 are fixed to the formwork 41 by screws 42 and bolts 421. The lower part of the formwork 41 is provided with movable angle steel 43, which is connected by screws 44 and bolts 441 to determine the height at which mortar can be applied. The screws 44 and bolts 441 are also used to support the lower part of the formwork, ensuring that the formwork 41 and the expansion joint device 5 can be in close contact. To ensure the rigidity of the formwork 41, vertically arranged fixed angle steel 413 is provided on the back of the formwork; the upper and lower parts of the formwork of the formwork support system can be adjusted and fixed by bolts between the screws. Multiple vertically arranged formwork positioning holes 412 are opened on the surface of the formwork, and the angle steel at the bottom of the formwork can slide up and down along the formwork positioning holes 412 and be freely adjusted and fixed.

[0062] In practice, the rapid repair mortar uses two-component inorganic materials that are thoroughly mixed in a specific ratio, then 6% to 8% water is added. After stirring evenly, it is applied to the concrete surface of the expansion joint. The aggregate of the high-performance rapid repair mortar should not exceed 4mm, and it should reach the material strength suitable for open traffic within 2 hours from the time water is added and the mixture is stirred until it sets and hardens.

[0063] In practice, high-performance rapid repair mortar is made by mixing two components in a specific ratio on-site, then adding water and stirring until homogeneous. The compressive strength, shear strength, bond-flexural strength, and pull-out strength bonded to the original concrete all meet the requirements of the engineering project and relevant standards and specifications. It should be noted that this material also possesses early strength and self-compacting properties.

[0064] In practice, to ensure the overall rigidity of the template, the diameter of the upper and lower screws shall not be less than 25mm, the angle steel of the bottom shall be an equal-sided angle steel of not less than 40*3mm, and the angle steel used to determine the laying thickness shall not be an equal-sided angle steel of not less than 40*3mm.

[0065] In practice, before applying high-performance rapid repair mortar, the height difference between the expansion joint device and the asphalt pavement layer and the area to be repaired should be measured in advance, and the amount of repair material required should be calculated.

Claims

1. A rapid construction device for addressing vehicle bouncing at bridge expansion joint locations, characterized in that, Includes template support (45), template (41), movable angle steel (43), first screw (42) and second screw (44); The expansion joint device (5) is fixed on both sides by the concrete anchorage area (2). The two sides of the anchorage area (2) are the bridge carriageway, and the surface is asphalt surface (1). The template support (45) is fixed on the asphalt surface (1) on both sides. Two vertically arranged templates (41) are installed on both sides of the expansion joint. The templates (41) are arranged along the extension direction of the expansion joint. Two movable angle steels (43) are provided on the bottom outer side of the two templates (41). The movable angle steels (43) extend horizontally along the extension direction of the expansion joint. The two templates (41) are fixed by the first screw (42) and the second screw (44) located at the top and bottom. The two ends of the first screw (42) pass through the two templates (41) respectively and are then connected to the template supports (45) on both sides by bolts. The two sides of the second screw (44) are used to connect the movable angle steel (43) and the template (41) respectively. The installation method of the movable angle steel (43) is as follows: Mark the template (41) so that the bottom surface of the movable angle steel (43) is flush with the surface to be leveled and the repair height. Connect the movable angle steel (43) to the template (41) through the second screw (44). Finally, fix the second screw and the first screw (42) by tightening the bolts.

2. The rapid construction device for addressing bridge expansion joint bounce as described in claim 1, characterized in that, The inner side of the template (41) is vertically arranged with multiple fixed angle steels (413) for supporting the template (41). The template (41) has multiple vertical through holes (412) on its surface; the first screw (42) and the second screw (44) pass through the top and bottom of the vertical through holes (412) respectively and are fixedly connected by bolts; The first screw (42) and the second screw (44) are adjusted to a fixed position by moving up and down along the vertical through hole (412).

3. A rapid construction method for handling bridge expansion joint bounce phenomena using the device described in any one of claims 1 to 2, characterized in that, Includes the following steps: Step 1) Measure the elevation: Measure the elevation of the steel sections on both sides of the bridge expansion joint and the elevation of the asphalt surface (1) on both sides respectively, and calculate the repair height of the anchorage zone; Step 2) Base cleaning: Grind and clean the surface of the anchorage area (2) to be repaired; Step 3) Erect formwork on both sides of the expansion joint and install movable angle steel (43) according to the repair height obtained in Step 1). Step 4) Prepare the quick-setting mortar; Step 5) Apply mortar to the surface of the anchorage area (2) to be repaired and allow it to cure; Step 6) Remove the formwork; Step 7) Resume traffic.

4. The rapid handling method for vehicle bouncing at bridge expansion joint locations according to claim 3, characterized in that, Step 1) specifically refers to: 1.1) Take measuring points on the steel profile and asphalt surface (1) on both sides of the expansion joint: Mark the multiple intersection points of the lane markings on the asphalt surface (1) and the expansion joint anchorage area (2) as the first measuring points and set their elevations; Mark the multiple intersection points between the extended lines of the lane markings and the steel sections on the expansion joint device as the second measuring points, and set their elevations accordingly; 1.2) After connecting the first measuring points on both sides of the asphalt surface, the repair surface of the anchorage area is obtained by fitting. The repair height of the anchorage area (2) is calculated based on the repair surface. The amount of mortar used in the anchorage area is estimated based on the height difference between the repair height and the second measuring point.

5. The rapid treatment method for vehicle bouncing at bridge expansion joint locations according to claim 3, characterized in that, Step 2) specifically refers to: Grind the concrete in the anchorage zone (2) to increase the adhesion between the concrete in the anchorage zone (2) and the repair mortar. Keep the concrete surface clean after grinding.

6. The rapid treatment method for vehicle bouncing at bridge expansion joint locations according to claim 3, characterized in that, Step 3) specifically refers to: First, place the template support (45) on the asphalt surface (1) on both sides of the expansion joint. Then, use the first screw (42) to initially fix the template (41) from the top. Then, mark the repair height obtained in step 1) on the template (41) so that the bottom surface of the movable angle steel (43) is flush with the surface to be leveled and the repair height. Then, connect the movable angle steel (43) to the template (41) through the second screw (44). Finally, fix the second screw and the first screw (42) by tightening the bolts.

7. The rapid treatment method for vehicle bouncing at bridge expansion joint locations according to claim 6, characterized in that, A release agent is applied to the outer side of the template (41), which is the side closest to the anchoring area. The template is made of a supportive steel plate. The template (41) extends to fit the lane width. The template support (45) and the number of screws are adjusted according to the lane width to meet the template support requirements. The expansion joint device (5) is composed of steel sections and is fixed on both sides by concrete anchoring zones (2). The bottoms of the two templates (41) abut against the steel sections on both sides of the expansion joint device (5).

8. The rapid treatment method for vehicle bouncing at bridge expansion joint locations according to claim 3, characterized in that, In step 5): The well-mixed mortar mixture is laid on the cleaned concrete surface of the anchoring area (2) and smoothed according to the position of the movable angle steel (43). The smoothing is completed before the mortar sets so that the top surface of the mortar is level with the bottom surface of the movable angle steel (43).

9. The rapid treatment method for vehicle bouncing at bridge expansion joint locations according to claim 3, characterized in that, In step 6), the formwork is removed after the mortar strength reaches 80% of the design strength.

Images