CN217733753U

CN217733753U - Sand grain type asphalt mixture bridge deck pavement structure

Info

Publication number: CN217733753U
Application number: CN202220871241.3U
Authority: CN
Inventors: 任园; 鲍世辉; 方肖立; 张玉斌; 王春红; 曹祝林; 牛京涛; 王祥彪
Original assignee: Anhui Transport Consulting and Design Institute Co Ltd
Current assignee: Anhui Transport Consulting and Design Institute Co Ltd
Priority date: 2022-04-15
Filing date: 2022-04-15
Publication date: 2022-11-04
Anticipated expiration: 2032-04-15

Abstract

The utility model provides a sand grain type asphalt mixture bridge deck pavement structure, which comprises a bridge deck, a waterproof bonding layer, a pavement lower layer, a bonding layer and a pavement upper layer from bottom to top, wherein each structural layer is pressed through gravity, thereby forming an integral structure; the waterproof bonding layer comprises three parts from bottom to top, namely a water-based permeable inorganic waterproof agent, thermally modified asphalt and asphalt pre-wrapped gravel. The utility model relates to a sand grain formula bituminous mixture bridge deck pavement structure, whole layer of mating formation adopts sand grain formula bituminous mixture, and the lower floor of mating formation adopts the tar sand, to concrete bridge deck board, the upper strata of mating formation bonds, the aspect condition such as transition is better, and waterproof bonding layer adopts three-layer waterproof construction, and is all comparatively favourable to structural layer wholeness, atress conduction.

Description

Sand grain type asphalt mixture bridge deck pavement structure

The technical field is as follows:

the utility model belongs to the technical field of highway engineering, particularly, relate to a sand grain formula bituminous mixture bridge deck pavement structure.

Background art:

generally, a bridge is used as a crossing barrier, a bridge deck is always completely exposed in air, the bridge deck is an important component of a bridge structure, the bridge bears vehicle fatigue load and environmental load during the running of the bridge, the occurrence of durability diseases is relatively frequent, rainwater falls to the surface of the bridge and cannot be removed, the rainwater is left in a bridge pavement layer, early diseases such as pit and groove in the pavement layer and peeling can be caused under the action of dynamic water pressure, meanwhile, the rainwater seeps into a beam plate, steel bars can be corroded, the safety of the bridge structure is influenced, and the later results are quite serious.

The bridge deck pavement is an extremely complex multidirectional stressed structure, the stress distribution of a bridge is influenced by the difference of a bridge type structure, span and bridge width-span ratio and the structure (structural combination, material parameters, mechanical characteristics and the like) of a pavement layer, the influence factors of the bridge deck pavement are complicated, and the macroscopic performances are different.

At present, concrete bridge deck pavement mostly adopts and paves the structure the same with the well upper strata in the road bed section, generally is the combination of well grain formula bituminous mixture and fine grain formula bituminous mixture, and the design void fraction is generally 4 ~ 6%, receives construction level, process equipment restriction, and this kind of inside intercommunication space that appears of structure of mating pavement also has the space with the concrete interface of lower floor, has certain influence to the cohesiveness of mating pavement, durability. Therefore, the characteristics of the environment, climate and traffic load of the bridge are combined, and the paving structure which has a certain stress deformation recovery capability, good flexibility, good skid resistance and good noise reduction function is provided, so that the driving safety and comfort are guaranteed, and the durability of the paving layer is ensured.

The utility model has the following contents:

the utility model discloses to the bridge deck pavement not enough durability problem, will mat formation the structural layer design for double-deck sand grain formula bituminous mixture, mat formation the airtight waterproof of lower floor, cohesiveness and deformability are good, mat formation the upper strata antiskid fall make an uproar, the driving function is more excellent, improved mat formation the structure and acted on the aspect of receiving water, load, environment under life. The utility model discloses the technical problem that will solve adopts following technical scheme to realize:

a sand grain type asphalt mixture bridge deck pavement structure comprises a bridge deck, a waterproof bonding layer, a pavement lower layer, a bonding layer and a pavement upper layer from bottom to top, wherein all structural layers are pressed together through gravity, and an integral structure is further formed;

the waterproof bonding layer comprises three parts from bottom to top, namely a water-based permeable inorganic waterproof agent, thermally modified asphalt and asphalt pre-wrapped gravel.

The utility model discloses a further technique:

preferably, the spreading amount of the thermally modified asphalt is 1.5-2.0 kg/m ² The asphalt pre-coated broken stone is single-grain-diameter broken stone with the diameter of 4.75-9.5 mm, the coverage rate of the broken stone is 60-70%, the water-based permeable inorganic waterproofing agent is spread in two layers, and each layer is spread with 200-300 g/m ² 。

Preferably, the aggregate in the sand-type asphalt mixture has the maximum grain size of 4.75mm.

Preferably, the lower paving layer is asphalt sand, the thickness of the asphalt sand is 2.5-3.5 cm, and the void ratio of the asphalt sand is less than 2%.

Preferably, the upper layer of the pavement is of a framework filling structure, two grades of aggregates with the grain diameter of 3-5 mm and the grain diameter of 5-10 mm form a framework structure relationship, and the aggregate with the grain diameter of 0-3 mm, the mineral powder and the asphalt fill gaps formed in the framework structure state.

Preferably, the adhesive layer is modified emulsified asphalt, and the spreading amount is 0.4-0.6L/m 2.

The beneficial effects of the utility model are that:

the utility model relates to a sand grain formula bituminous mixture bridge deck pavement structure, whole layer of mating formation adopts sand grain formula bituminous mixture, and the lower floor of mating formation adopts the tar sand, to concrete bridge deck board, the upper strata of mating formation bonds, the aspect condition such as transition is better, and waterproof bonding layer adopts three-layer waterproof construction, and is all comparatively favourable to structural layer wholeness, atress conduction.

The utility model relates to a sand grain formula bituminous mixture bridge floor structure of mating formation, the lower floor of mating formation has better deformation harmony, airtight waterproof nature, and the shop is adorned the upper strata and has great space to have better anti-skidding and fall the performance of making an uproar, have great promotion to the service function, the durability of the structure of mating formation.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a block diagram of the present invention;

FIG. 2 is a schematic view of a waterproof adhesive layer;

FIG. 3 is a schematic view of a layered structure;

in the figure: 1. laying an upper layer; 2. a bonding layer; 3. paving the lower layer; 4. a waterproof adhesive layer; 5. a bridge deck; 41. pre-wrapping the asphalt with gravel; 42. thermally modifying the asphalt; 43. a water-based permeable inorganic waterproofing agent.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings and embodiments, which are to be understood as illustrative only and not limiting the scope of the invention. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Example (b):

as shown in figure 1, the pavement structure of the sand grain type asphalt mixture bridge deck comprises a 2cm ultrathin anti-sliding abrasion layer 1, a modified emulsified asphalt adhesive layer 2,3cm AC-5 asphalt 3, a waterproof adhesive layer 4 and a concrete bridge deck 5 from top to bottom.

The maximum grain diameter of the ultrathin anti-skid wearing layer 3 of the upper layer 1 is 4.75mm, the porosity is 10 percent, the spreading amount of the modified emulsified asphalt bonding layer 2 is 0.5L/m < 2 >, and the porosity of the AC-5 asphalt sand of the lower layer is 1.8 percent.

As shown in figure 2, the waterproof bonding layer 4 comprises a water-based permeable inorganic waterproof agent 43, thermal modified asphalt 42 and asphalt pre-coated crushed stone 41, wherein the water-based permeable inorganic waterproof agent is coated by double layers, the coating amount of each layer is 200-300 g/m < 2 >, the thermal modified asphalt is SBS modified asphalt, the consumption is 1.8kg/m < 2 >, and the asphalt pre-coated crushed stone is crushed stone with single particle size of 4.75-9.5 mm coated by common asphalt with the oil-stone ratio of 2.0%.

The concrete bridge deck 5 is milled in advance to a depth of 0.5cm.

The utility model relates to a sand grain formula bituminous mixture bridge floor pavement structure, whole pavement layer thickness is in about within 6cm, and more conventional 10cm pavement layer thickness reduces more than 40%, alleviates bridge bearing capacity to practice thrift the cost, build few cost.

As shown in fig. 3, the upper layer of the pavement of the utility model is a framework filling structure, two grades of aggregate with the particle size of 3-5 mm and the particle size of 5-10 mm form a framework structure relationship, and the particle size of 0-3 mm is used for aggregate, mineral powder and asphalt to fill the gap formed under the framework structure state.

The above description is only a preferred embodiment of the present invention, and it should be noted that: for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be considered as the protection scope of the present invention.

The technical means disclosed by the scheme of the present invention is not limited to the technical means disclosed by the above embodiments, but also includes the technical scheme formed by the arbitrary combination of the above technical features.

Claims

1. The utility model provides a sand grain formula bituminous mixture bridge deck pavement structure, bridge deck pavement structure includes decking, waterproof bonding layer from bottom to top, paves the lower floor, the adhesion coating and paves the upper strata and constitute, through the gravity pressfitting between its each structural layer, and then forms an overall structure, its characterized in that:

the waterproof bonding layer comprises a water-based permeable inorganic waterproof agent layer, a thermal modified asphalt layer and an asphalt pre-wrapped crushed stone layer from bottom to top.

2. A sand-type bituminous mixture deck pavement structure according to claim 1, wherein: the asphalt pre-coated broken stones are single-grain-size broken stones with the diameter of 4.75-9.5 mm.

3. The deck pavement structure of the sand type asphalt mixture according to claim 1, wherein: the water-based permeable inorganic waterproof agent is provided with two layers.

4. A sand-type bituminous mixture deck pavement structure according to claim 1, wherein: the maximum aggregate grain size in the sand grain type asphalt mixture is 4.75mm.

5. A sand-type bituminous mixture deck pavement structure according to claim 1, wherein: the lower layer of the pavement is asphalt sand, the thickness of the asphalt sand is 2.5-3.5 cm, and the void ratio of the asphalt sand is less than 2%.

6. A sand-type bituminous mixture deck pavement structure according to claim 1, wherein: the adhesive layer is modified emulsified asphalt.