Method for additionally paving overlay on road surface containing bridge expansion joint

Abstract

The invention provides a method for additionally paving a cover surface on a road surface containing a bridge expansion joint, which comprises the following steps of: cleaning an original road surface, and treating diseases; a synchronous all-in-one machine or a micro-surfacing thin slurry sealing machine is adopted to conduct overlay additional paving on the original pavement, continuous paving is conducted without breaking when the pavement passes through a bridge expansion joint, the mixture compaction work is completed, and a road ultra-thin overlay or a micro-surfacing overlay with the thickness being 1.0-2.5 cm is formed; a cover face at the position of the bridge expansion joint is cut flatly along the two ends of the V-shaped steel beam, a cover face mixture is cleaned out of the bridge expansion joint, and rubber strips in the original bridge expansion joint are cleaned; pouring the modified asphalt-based sealant above the adhesive tape of the original bridge expansion joint until the top surface of the modified asphalt-based sealant is 1-2mm higher than the overlay which is additionally paved; when the temperature of the modified asphalt-based sealant of the bridge expansion joint is reduced to 30-70 DEG C, judging whether the expansion joint is secondarily poured to be flush with the overlay which is additionally paved or not; therefore, the problems of uncomfortable feeling of bumping and easy product damage at the bridge expansion joint when the overlay is additionally paved are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of road construction engineering, and in particular relates to a method for overlaying a road surface containing a bridge expansion joint. Background Art

[0002] In the design of ordinary highway bridges, most of them adopt simple supported beam structure, and rubber water-stop tape is used for expansion joints. Since the choice of water-stop tape has no effect on the structure of the bridge, it is often not taken seriously. However, in the operation and maintenance of highway bridges, whether it is a bridge on a highway or a county road or a township road, there are the following problems during operation: (i) The sand and gravel on the road surface accumulate in the expansion joint of the bridge and are difficult to clean. The mud and sand gradually clump. When the wheels run over, the rubber water-stop strips are squeezed, and then fall off, sink, crack, and leak seriously. Rainwater can bring mud and sand into the deep expansion joint of the bridge through the damaged rubber strips and accumulate. Filling in the expansion joint will interfere with the normal expansion and contraction of the bridge and affect the structural safety. In addition, due to leakage, the beams and slabs at the expansion joints are in a wet state for a long time, and the steel bars are easily corroded, which in turn affects the service life of the bridge. The work of replacing rubber strips is very complicated. (ii) When a vehicle passes through the expansion joint at high speed, due to the non-continuity on the plane, it will cause vehicle jumping and noise, and the comfort is extremely poor. (III) After a period of time, preventive maintenance work must be carried out on the road, such as micro-surfacing or overlaying of ultra-thin wear layers. The thickness of these thin overlays is generally 10-25mm. How to deal with the overlay layer at the expansion joint of the bridge becomes a problem: if the bridge expansion joint is directly and continuously constructed, the ultra-thin overlay cannot be fully laid at the expansion joint of the bridge due to the different properties of steel parts and asphalt mixture materials and the large space in the rubber waterstop strip in the expansion joint of the bridge. After the overlay construction is completed, the bridge expansion joint is cut, cleaned and removed to remove the relevant mixture. The appearance of the expansion joint is improved to a certain extent, but this position is often prone to disease. When high-speed vehicles pass through this place, the jumping, noise, comfort and safety problems are relatively serious. The mixture jumping place is also prone to disease due to the force of the wheels, and the later road surface disease is difficult to deal with. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems in the above-mentioned technology to a certain extent, that is, to solve the problem of silt accumulation and filling caused by aging and leakage of rubber strips, which affects the structural safety and normal contraction of the bridge, so that the material at the expansion joint forms a continuum with the road surface, and the deformation of the asphalt-based joint filler at the joint is used to absorb the expansion and contraction of the beam body; solve the discomfort of jumping the vehicle, and solve the problem that the product is prone to disease at the expansion joint of the bridge when adding a cover. To this end, the purpose of the present invention is to propose a method for adding a cover to a road surface containing a bridge expansion joint.

[0004] To achieve the above object, an embodiment of the present invention provides a method for overlaying a road surface containing a bridge expansion joint, which comprises the following steps:

[0005] S1. Clean the original road surface and treat the damage;

[0006] S2. Use a synchronous integrated machine or a micro-surfacing slurry sealing machine to pave the original road surface, pave continuously without interruption when passing through the expansion joint of the bridge, and complete the mixture compaction work to form a 1.0 cm to 2.5 cm thick ultra-thin road surface or micro-surfacing surface;

[0007] S3, cutting the cover surface at the bridge expansion joint in step S2 along both ends of the V-shaped steel beam to make it flat, and cleaning the cover surface mixture from the bridge expansion joint, and cleaning the rubber strip in the original bridge expansion joint;

[0008] S4. Pour modified asphalt-based sealant above the rubber strip of the original bridge expansion joint until the top surface of the modified asphalt-based sealant is 1-2mm higher than the added overlay surface;

[0009] S5. When the modified asphalt-based sealant of the bridge expansion joint is cooled to 30-70° C., determine whether the modified asphalt-based sealant material shrinks to below the top surface, so as to pour the expansion joint a second time until it is flush with the added cover surface.

[0010] According to an embodiment of the present invention, a method for adding a pavement overlay on a road surface containing a bridge expansion joint is provided. The method uses a modified asphalt-based sealant to fill the bridge expansion joint. The modified asphalt-based sealant has excellent low-temperature crack resistance and elastic recovery capabilities, can adhere well to steel plates and asphalt mixtures, and has small high-temperature flow deformation. At the same time, the viscoelastic properties of the modified asphalt can adapt to repeated temperature and load displacements, and the modified asphalt itself has strong deformation and recovery capabilities with the bridge, so that the expansion joint and the added overlay form a continuum, and the deformation of materials such as asphalt concrete and modified asphalt-based sealant at the joint is used to absorb the expansion and contraction of the beam body, provide support for the wheels, and reduce vehicle jumping and noise; thereby solving the problem of product defects that are prone to occur at the expansion joint of the bridge when adding the overlay.

[0011] In addition, the method for overlaying a road surface containing a bridge expansion joint according to the above embodiment of the present invention may also have the following additional technical features:

[0012] Optionally, the properties of the modified asphalt-based sealant are as follows:

[0013]

[0014] It can be understood that the modified asphalt-based sealant is used for bridge expansion joints, and the modified asphalt sealant is required to be able to deform and recover with the deformation of the bridge expansion joints. Therefore, a dynamic shear rheometer is used to test its elastic recovery ability, and multiple stress creep recovery tests are carried out to test its elastic recovery ability; the low-temperature tensile test takes into account that the modified asphalt sealant is actually connected to the steel plate and the mixture. During the test, the steel plate and the cement mixture are simultaneously used for low-temperature tensile cycle testing, which is required to meet the requirements.

[0015] Optionally, step S4 includes:

[0016] S41. Clean the rubber strips of the original bridge expansion joints and check and determine the damage rate of the old rubber strips;

[0017] S42. When the damage rate of the old rubber strips is less than 30% and the undamaged old rubber strips can withstand the new rubber strips and the pouring of the modified asphalt sealant, the new rubber strips are stacked on the damaged position of the old rubber strips and the overlapping length of the new and old rubber strips on both sides must be ≥10cm, and the new rubber strips do not exceed the top surface of the steel beam. Then, the modified asphalt-based sealant is poured on the stacked new rubber strips and the unstacked old rubber strips until the top surface of the modified asphalt-based sealant is 1-2mm higher than the added overlay surface.

[0018] Optionally, in step S41, the dust on the original bridge expansion joint is cleaned, and the steel beam is polished and rusted using a grinder.

[0019] Optionally, in step S4, the expansion joints of the bridges in the same lane of the road section with a transverse slope are separated into multiple sections using cardboard so that the poured modified asphalt-based sealant is segmented in the expansion joints of the bridges; this can avoid excessive flow from high places to low places during pouring. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a picture of the bridge expansion joint and the road surface taken when the construction is completed according to Example 1 of the present invention;

[0021] Figure 2 This is a picture of the bridge expansion joint and the road surface taken one year after the construction according to Example 1 of the present invention. DETAILED DESCRIPTION

[0022] In order to better understand the above technical solution, the exemplary embodiments of the present invention will be described in more detail below. It should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0023] In order to further illustrate the present invention, a method for overlaying a road surface containing a bridge expansion joint provided by the present invention is described in detail below in conjunction with embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0024] Example 1

[0025] The method for constructing a road surface overlay including a bridge expansion joint in this embodiment includes:

[0026] (1) Clean the original road surface and treat the damage. The damage treatment is carried out by methods familiar to those skilled in the art.

[0027] (2) A synchronous all-in-one machine is used to pave the Walter Superlayer ultra-thin wear layer overlay. When passing through the expansion joint of the bridge, the paving is carried out normally and continuously without interruption, and the corresponding mixture compaction work is completed to form an ultra-thin road overlay with a thickness of 1.2cm to 1.5cm.

[0028] (3) Cut the cover surface evenly along both ends of the V-shaped steel beam and clean the cover surface mixture from the bridge expansion joint, and clean the rubber strips of the original bridge expansion joint.

[0029] (4) Check and determine the damage rate of the old rubber strips: clean the dust on the original bridge expansion joints to avoid affecting the adhesion between the sealant and the rubber strips; use a grinder to grind and remove rust from the steel beams and blow them clean to increase the adhesion between the sealant and the steel beams; when judging the damage rate of the old rubber strips, when the damage rate of the old rubber strips is less than 30% and the undamaged old rubber strips can withstand the new rubber strips and pour the modified asphalt sealant, stack the new rubber strips on the damaged position of the old rubber strips and the stacking length of the new and old rubber strips on both sides must be ≥10cm, and the new rubber strips must not exceed the top surface of the steel beam. The new rubber strips are triangular V-shaped bottom rubber strips or semicircular bottom rubber strips, the size can be cut and stacked on the old rubber strips, and the material should be high-temperature rubber strips that can withstand the sealant pouring temperature (temperature resistance ≥170℃). When the damage rate of the old rubber strips is ≥30% and the rubber strips cannot be stacked and the sealant cannot be poured, replace the old rubber strips.

[0030] (5) Pour modified asphalt-based sealant on the rubber strip of the original bridge expansion joint (the superimposed new rubber strip and old rubber strip or the new rubber strip) until the top surface of the modified asphalt-based sealant is about 2mm higher than the top surface of the added cover. The sealant is heated in advance to a good fluidity (160℃-190℃) using a special caulking machine with a pump. When pouring, considering the slope of some bridge decks, and considering the subsequent maintenance or preventing the entire piece of sealant from being lifted up in a large area, each lane can be divided into three sections with cardboard. When pouring, proceed from high to low to avoid introducing less gas. When caulking the sealant, try to stay at one place and move to another place by impact or height difference until the place is slightly submerged in the planned filling surface before moving to the next position. Since the density of the caulking material (modified asphalt-based sealant) changes with temperature, it will shrink when the temperature drops. It is necessary to supplement the shrinkage surface again after cooling to ensure that the material fills the rubber strip and is flush with the cover, and has good adhesion with the steel beams on both sides.

[0031] In this embodiment, the test results of the performance of the modified asphalt-based sealant used are shown in the following table:

[0032] Performance of modified asphalt-based sealants

[0033]

[0034] Note: The low temperature tensile die is made of steel plate, and the adhesion between the sealant and the steel plate and the mixture is tested.

[0035] When this embodiment is used for actual field application investigation, Figure 1 and Figure 2 As shown, Figure 1 These are photos of the bridge expansion joints and road surface taken when construction was completed. Figure 2 This is a photo of the bridge expansion joint and road surface taken one year after construction. Figure 2 It can be seen that the filler formed by the construction method of overlaying a road surface containing a bridge expansion joint in this embodiment meets the requirements and achieves the effect, so that the material at the expansion joint and the road surface form a continuum, and the deformation of the asphalt-based filler at the joint is used to absorb the expansion and contraction of the beam body; the discomfort of vehicle jumping is solved, and the problem of product defects that are prone to occur at the expansion joint of the bridge when overlaying is solved.

[0036] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

[0037] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A method for overlaying a road surface containing a bridge expansion joint, characterized in that: The following steps are involved: S1. Clean the original road surface and treat the damage; S2. Use a synchronous integrated machine or a micro-surfacing slurry sealing machine to pave the original road surface, pave continuously without interruption when passing through the expansion joint of the bridge, and complete the mixture compaction work to form a 1.0 cm to 2.5 cm thick ultra-thin road surface or micro-surfacing surface; S3, cutting and leveling the cover surface at the expansion joint of the bridge in step S2 along the two ends of the V-shaped steel beam, cleaning the cover surface mixture from the expansion joint of the bridge, and cleaning the rubber strip in the original expansion joint of the bridge; S4. Pour modified asphalt-based sealant above the rubber strip of the original bridge expansion joint until the top surface of the modified asphalt-based sealant is 1-2mm higher than the added overlay surface; S5. When the modified asphalt-based sealant of the bridge expansion joint is cooled to 30-70° C., determine whether the modified asphalt-based sealant material shrinks to below the top surface, so as to pour the expansion joint a second time until it is flush with the added cover surface.

2. The road surface overlay method according to claim 1, characterized in that: The properties of the modified asphalt-based sealant are as follows:

3. The road surface overlay method according to claim 1, characterized in that: Step S4 includes: S41. Clean the rubber strips of the original bridge expansion joints and check and determine the damage rate of the old rubber strips; S42. When the damage rate of the old rubber strips is less than 30% and the undamaged old rubber strips can withstand the new rubber strips and the pouring of the modified asphalt sealant, the new rubber strips are stacked on the damaged position of the old rubber strips and the overlapping length of both sides of the new rubber strips and the old rubber strips must be ≥10cm, and the new rubber strips must not exceed the top surface of the steel beam. Then, the modified asphalt-based sealant is poured on the stacked new rubber strips and the unstacked old rubber strips until the top surface of the modified asphalt-based sealant is 1-2mm higher than the added overlay surface.

4. The road surface overlay method according to claim 3, characterized in that: In step S41, the dust on the original bridge expansion joint is cleaned, and the steel beam is polished and rusted using a grinder.

5. The road surface overlay method according to claim 1, characterized in that: In step S4, the expansion joint of the bridge in the same lane of the road section with a transverse slope is separated into multiple sections using cardboard so that the poured modified asphalt-based sealant is segmented in the expansion joint of the bridge.

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