CN108625300B - A kind of reconstruction method of bridge cement pavement - Google Patents

Abstract

The invention discloses a reconstruction method of bridge cement pavement, which comprises the following methods: adopting the method of side-by-side construction, sealing half of the pavement to divert the route formed; and planing the cement concrete surface layers within the scope of the left and right sides of the expansion joint along the longitudinal direction of the bridge , and then pave densely graded asphalt mixture within this range to reach the original road surface elevation; plan the outer pavement along the longitudinal direction of the bridge, and then pave the thickness of open graded asphalt mixture within this range; wait until the temperature of the road surface Open to traffic after lower than the acceptance standard. During the renovation process, since the densely graded asphalt mixture is at the same elevation as the original road surface, there is no need to replace the expansion joints, and the further outward pavement of the densely graded asphalt mixture is only the surface layer, so the construction noise is small, the construction speed is fast, and less waste is generated; densely graded asphalt mixture The combination of asphalt mixture and open-graded asphalt mixture can optimize the drainage effect of bridges. This invention is used in the field of bridges and roads.

Description

A kind of reconstruction method of bridge cement pavement

technical field

The invention relates to the field of bridge roads, in particular to a reconstruction method for bridge cement road surfaces.

Background technique

There are three common technical measures to transform bridge cement concrete pavement into asphalt concrete pavement: directly add asphalt concrete surface layer with a thickness of about 10cm; directly add an asphalt concrete surface layer with a thickness of about 2cm; remove the existing cement concrete pavement Install new asphalt concrete surface. However, the reconstruction of urban bridges needs to consider the following factors: first, the impact on traffic, urban traffic is generally relatively busy, and the length of the construction period is particularly important; second, the impact on surrounding residents, the general residential areas around urban bridges are relatively dense, vibration, noise, The control of construction time, dust, garbage, etc. should be more stringent; third, from the perspective of saving and environmental protection, minimize construction waste and reduce the amount of materials; fourth, the existing expansion joints should not be wasted, and the thickness of overlay should not affect Normal use of existing expansion joints.

The existing three technical solutions all have certain limitations. The first solution is to directly add an asphalt concrete surface layer with a thickness of about 10cm. The increased thickness is relatively large. The impact of the added asphalt concrete weight on the bridge structure is compared Large; vibration compaction is required, resulting in greater noise and vibration; the elevation of the current road surface is raised by about 10cm, and expansion joints need to be replaced and upgraded. The second option—directly laying an asphalt concrete surface layer with a thickness of about 2cm, although the weight of the added asphalt concrete has relatively little impact on the bridge structure, and only requires static pressure, the noise and vibration are relatively small compared to the first option, but due to The pavement level has been raised and the expansion joints still need to be replaced and raised. The third option—remove the existing cement concrete pavement and build a new asphalt concrete surface course. This solution hardly increases the weight of the road surface, and does not need to renovate and upgrade the expansion joints, but there are many wastes, especially the existing bridge cement concrete pavement. When it is not necessary to completely remove the surface layer for the disease of the installation, there is waste; compared with the first and second plans, the removal of cement concrete will generate greater noise and vibration.

Each kind of asphalt mixture has its own advantages and disadvantages. If densely graded asphalt mixture is paved on the road surface, although it has a good waterproof effect, it will be accompanied by problems such as rapid attenuation of anti-skid performance, loud noise and water drift; if using Although the open-graded asphalt mixture has good anti-skid performance and noise-absorbing function, it is necessary to reserve gaps and drainage paths inside the structure of the open-graded asphalt mixture. original effect. If open-graded asphalt mixture is used on the bridge pavement, there will be a major problem, that is, the above-mentioned drainage problem. In view of the defects of open-graded asphalt mixture, this plan reflects on the commonly used open-graded asphalt mixture, and believes that the The graded layer thickness is the main cause of drainage defects.

Contents of the invention

The object of the present invention is to provide a bridge cement pavement reconstruction method that has little interference to surrounding residents, little interference to bridge structure safety, and is environmentally friendly and efficient.

The technical scheme that the present invention takes is:

A method for rebuilding a bridge cement pavement, comprising the following methods:

a. Use the side-by-side construction method to close half of the road surface to form a route diversion;

b. Along the longitudinal direction of the bridge, remove the cement concrete surface layer within 4-6m on the left and right sides of the expansion joint. At this time, the thickness of the removal is 1.8-2cm, and then pave the densely graded asphalt mixture within this range until the densely graded asphalt The thickness of the mixture reaches the original road surface elevation;

c. Remove the cement concrete surface layer from the edge of the densely graded asphalt mixture to the edge of the bridge along the longitudinal direction of the bridge. At this time, the thickness of the layer is 1-1.2cm, and then the open-grade layer with a thickness of 1.8-2cm is paved within this range. With asphalt mixture;

d. Open traffic after the temperature of the road surface is lower than the acceptance standard.

As an improvement of the above solution, both steps b and c clean up the surface floating dust and sundries after the planing work is completed.

As an improvement of the above scheme, step c spreads high-viscosity asphalt before laying the graded asphalt mixture.

As an improvement to the above scheme, the width of the two-stage densely graded asphalt mixture in step b is 5 m, the thickness of the cement concrete surface layer removed in step c is 1 cm, and the thickness of the additional open graded asphalt mixture is 2 cm.

Beneficial effects of the present invention: during the transformation process, since the densely graded asphalt mixture is of the same elevation as the original road surface, no expansion joints need to be replaced, and the further outward pavement of the densely graded asphalt mixture only needs to remove the surface layer, the construction noise is small, and the construction speed is fast. Less waste is produced; the combination of densely graded asphalt mixture and openly graded asphalt mixture can optimize the drainage effect of the bridge and ensure the safety of the bridge.

Description of drawings

The present invention will be further described below in conjunction with accompanying drawing:

Fig. 1 is the sectional view of bridge concrete pavement;

Figure 2 is a top view of the bridge concrete pavement.

Detailed ways

The pavement herein refers to the upper surface of the cement concrete surface layer 1 .

With reference to Fig. 1, Fig. 2, the present invention is a kind of reconstruction method of bridge cement pavement, comprises following method:

a. Use the side-by-side construction method to close half of the road surface to form a route diversion.

b. Remove the cement concrete surface layer 1 within the range of 4-6m on the left and right sides of the expansion joint 4 along the longitudinal direction of the bridge, and clean up the floating dust and impurities on the surface in time. At this time, the thickness of the removal is 1.8-2cm, and then pave within this range Densely graded asphalt mixture 3 until the thickness of densely graded asphalt mixture 3 reaches the original road surface elevation; of course, the thickness of the planing can be further increased until the entire cement concrete surface layer 1 is removed, and only the final paved densely graded asphalt mixture is needed 3 to reach the original elevation.

c. Remove the cement concrete surface layer 1 from the edge of the densely graded asphalt mixture 3 to the edge of the bridge along the longitudinal direction of the bridge, and clean up the floating dust and impurities on the surface in time. Within this range, open-graded asphalt mixture 2 with a thickness of 1.8 to 2 cm is paved.

d. After the temperature of the road surface is lower than the acceptance standard, that is, lower than 50°C, traffic will be opened.

The study found that the thickness of the open-graded asphalt mixture 2 can be skillfully controlled to reduce the amount of water retained inside the road surface, correspondingly reduce the amount of water gushing up on both sides of the road surface, and reduce the interference of gushing water on the road surface. At the same time, the thinner open-graded asphalt mixture 2 helps to increase the evaporation rate of water after the weather is fine. After the thickness is reduced, the residual moisture in the pavement can easily flow out of the pavement under the action of the dynamic load of the vehicle and the traction of the water itself. For bridges, if all the graded asphalt mixture 2 is paved, the water flowing longitudinally inside the structure will have an adverse effect on the expansion joint 4, and the moisture accumulated on both sides of the expansion joint 4 will obviously affect the expansion joint 4. Useful life. In order to eliminate this adverse effect, densely graded asphalt mixture 3 is still paved within 4 to 6 m on both sides of the expansion joint 4 to prevent moisture from accumulating on both sides of the expansion joint 4 .

In Figure 1, the left and right sides of the expansion joint 4 are densely graded asphalt mixture 3, and the outer side is open-graded asphalt mixture 2. The two sections where open-graded asphalt mixture 2 is laid become the standard section, and the outermost part is the anti-corrosion section of the bridge. Hit the wall 5, the anti-collision wall 5 is not drawn in Fig. 1. As a preferred embodiment, the width of the two-stage densely graded asphalt mixture 3 in step b is 6 cm, and the thickness of the cement concrete surface layer 1 is 2 cm; the thickness of the cement concrete surface layer 1 is 1 cm in the step c, increasing The thickness of the graded asphalt mixture 2 laid is 2 cm.

This application scheme has the following advantages:

One is to retain the status quo expansion joints 4. After the pavement near the expansion joint 4 is excavated longitudinally, the asphalt concrete pavement is paved again, which can ensure that the pavement surface in this range is at the same height as the expansion joint 4 after transformation. The thickness of the overlaid open-graded asphalt mixture 2 is 2 cm. In fact, compared with before the reconstruction, the pavement elevation after overlaying the densely-graded asphalt mixture 3 is increased by 1 cm. The longitudinal slope change is from the standard section to the expansion joint 4, and the maximum gradient of the slope is 0.2%. Changes in the speed and volume of water flowing from the standard section to the expansion joint 4 position.

The 2nd, increase weight is little. The thickness of the cement concrete surface layer 1 removed near the expansion joint 4 in this plan is the same as that of the overlaid asphalt concrete, which will basically not increase the bridge load; the standard section removes the 1cm cement concrete surface layer 1, and then paves 2cm thick Open-graded asphalt mixture 2, compared with the original level, the thickness is increased by 1cm, and the increased weight is small.

Third, the impact of construction is small. In this plan, an open-graded asphalt mixture 2 with a thickness of 2 cm is paved in the standard section, and static pressure is sufficient. Moreover, the cement concrete surface layer 1 excavated near the expansion joint 4 is also controlled in the minimum range.

Fourth, the function is good. In the standard section, consider using open-graded asphalt mixture 2. Compared with densely-graded asphalt mixture 3, the former has a larger void ratio, which can retain a part of water to reduce surface runoff, which is beneficial to driving safety; large voids are beneficial Absorb car noise, increase driving comfort and reduce the impact on the outside world.

Of course, the present design creation is not limited to the above-mentioned embodiments, and the combination of different features of the above-mentioned embodiments can also achieve good effects. Those skilled in the art can also make equivalent modifications or replacements without departing from the spirit of the present invention, and these equivalent modifications or replacements are all included within the scope defined by the claims of the present application.

Claims (4)

1. a kind of remodeling method of bridge cement pavement, it is characterised in that including following methods:

A, by the way of dividing side to construct, closing half range road surface, which makes to form route, changes its course；

B, the Portland Cement Concrete Surface Course at left and right sides of expansion joint within the scope of 4~6m is excluded respectively along the longitudinal direction of bridge, exclude at this time With a thickness of 1.8~2cm, then making dense bitumen mixture within this range, until the thickness of dense bitumen mixture Reach former grade elevation；

C, the cement concrete surface in dense bitumen mixture edge to bridge edge extent is excluded respectively along the longitudinal direction of bridge Layer, is excluded at this time with a thickness of 1~1.2cm, the open gradation asphalt that then placement thickness is 1.8~2cm within this range；

D, the open to traffic after the temperature of road surface is lower than acceptance criteria.

2. the remodeling method of bridge cement pavement according to claim 1, it is characterised in that: step b and step c are completed Exclude the floating dust sundries that surface is cleared up after work.

3. the remodeling method of bridge cement pavement according to claim 2, it is characterised in that: the step c is opened in laying High-viscosity asphalt is first dispensed before gradation asphalt.

4. the remodeling method of bridge cement pavement described in any one of claim 1 to 3, it is characterised in that: the step The width of two sections of dense bitumen mixtures is 5m in rapid b, excluded in the step c Portland Cement Concrete Surface Course with a thickness of 1cm, Increase paving open gradation asphalt with a thickness of 2cm.