CN215714348U - Road surface structure with anti-skidding and anti-cracking functional layer top facing - Google Patents
Road surface structure with anti-skidding and anti-cracking functional layer top facing Download PDFInfo
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- CN215714348U CN215714348U CN202121451867.0U CN202121451867U CN215714348U CN 215714348 U CN215714348 U CN 215714348U CN 202121451867 U CN202121451867 U CN 202121451867U CN 215714348 U CN215714348 U CN 215714348U
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Abstract
The utility model discloses a pavement structure with an antiskid and anti-cracking functional layer mat coat, which comprises an antiskid and anti-cracking functional mat coat (1), a waterproof bonding layer (2) and an original pavement (3), wherein the original pavement (3) is provided with grouting cracks (4). The functional layer of the utility model has high bonding strength of the surface of the antiskid and anti-crack functional layer of the pavement, has excellent performances of rutting resistance, crack resistance, flying resistance and water damage resistance, can effectively protect the original pavement structure, delays the crack from expanding to the surface of the pavement and prolongs the service life of the pavement.
Description
Technical Field
The utility model relates to a pavement structure, in particular to a pavement structure with an antiskid and anti-crack functional layer cover surface.
Background
Asphalt pavement has the advantages of smooth surface, comfortable driving, wear resistance, low noise, short construction period, simple maintenance and the like, but because of the influence of various factors such as pavement structure, climate, terrain, geological conditions, driving load and the like, the base layer of the asphalt pavement is flexible or semi-rigid, and cracks with various shapes in different degrees can be generated. The initial cracks usually have no obvious influence on the service performance of the asphalt pavement, but with the invasion of rainwater or snow water on the surface, the pavement diseases in a cracking state become more and more serious, particularly, the water content of a roadbed near the cracks is increased and even saturated, and under the action of a large amount of driving loads, the diseases such as settlement, scouring, mud pumping, slurry turning and the like are generated, so that the service performance of the asphalt pavement is seriously influenced. The main form of the cracks is as follows:
1) transverse crack
The cracks are basically vertical to the central line of the road, the width of the cracks is different, the length of the cracks penetrates through the whole road width, the length of the cracks penetrates through part of the road width, the cracks are bent and curved, and branches are provided with forks. Slurry pumping in the transverse cracks causes the two sides of the cracks to be sunken, the transverse cracks of the road surface at the vehicle bump positions at the bridge head accelerate the vehicle bump development speed under the action of accumulated water on the road surface, and meanwhile, the road base can be scoured.
2) Longitudinal split
The crack trend is basically parallel to the travelling direction, and the length and the width of the crack are different. Typically on high fill subgrades. The longitudinal cracks are easy to form and are step-shaped along the driving direction, and the driving comfort is influenced.
3) Network crack
The cracks are criss-cross, the surface layer is divided into a plurality of polygonal small blocks, the width of the cracks is more than 1mm, and the distance between the cracks is less than 40 cm. The network cracks cause the asphalt pavement to be loose or have pits, and the comprehensive service level of the asphalt pavement is seriously influenced.
4) Reflection crack
After the base layer cracks, the cracks are gradually reflected to the asphalt surface under the action of temperature and traffic load, and the position and the shape of the road surface cracks are basically similar to those of the base layer cracks. The number of transverse cracks for the semi-rigid base layer is large, and the crack forms for the asphalt structural layer covered on the flexible pavement are different and mainly depend on the underlying layer.
At present, the commonly used treatment method for the diseases mainly comprises various technologies such as treatment of cover surfaces, excavation and re-paving, grouting reinforcement and the like. When the asphalt pavement cracks are treated, the traditional maintenance technology adopts a form of pouring a crack with crack pouring glue or adhering an anti-crack paste to the cracks, but the treatment effect of the crack treatment mode is not ideal, the cracks still have a tendency of expanding after the crack pouring or adhering the crack with the crack resisting paste is treated, and the treatment effect is lost within one year generally. The grouting reinforcement has the advantages of simple process, low cost, fast open traffic and the like, so the grouting reinforcement is widely applied to the non-excavation dimension repair reinforcement of roads and becomes a main reinforcement method. The road non-excavation type foaming polyurethane grouting technology is characterized in that under the non-excavation condition, polyurethane materials are injected into a base layer or a position where diseases occur in a roadbed in a high-pressure mode, and after a base layer crack is repaired, the bearing capacity and the durability of the base layer crack are improved, so that the reinforcing and strengthening effects are achieved.
On the other hand, after the pavement is in service for a long time, the pavement structure depth is reduced due to repeated action of climate environment, traffic load and automobile tires and the pavement, the anti-skid performance is obviously reduced, the pavement is maintained by the traditional maintenance mat coat process such as micro-surfacing, super-viscous fiber wearing layer, fog sealing layer and other technologies, the anti-skid performance of the pavement is improved to a certain extent, but the phenomenon that the pavement performance is better but the anti-skid performance is insufficient still exists, and the anti-skid performance of the asphalt pavement needs to be improved urgently.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: the utility model aims to provide a pavement structure with good crack protection and skid resistance.
The technical scheme is as follows: the utility model provides a pavement structure with an anti-skid anti-cracking functional layer cover surface, which comprises an anti-skid anti-cracking functional layer cover surface layer, a waterproof bonding layer and an original pavement, wherein the original pavement is provided with grouting cracks, and the grouting cracks refer to the fact that the cracks are subjected to trenchless grouting crack pouring treatment.
Furthermore, the antiskid anti-crack functional finish coat adopts epoxy resin emulsified asphalt. The epoxy resin emulsified asphalt is subjected to cold mixing and cold paving construction for paving, high-strength bonding strength and shear strength can be formed without heating, and the epoxy resin emulsified asphalt has the characteristics of excellent high-temperature anti-rutting performance, outstanding crack resistance and water damage resistance.
Furthermore, the antiskid anti-cracking functional overlay coating adopts the SMA-5 and UTAC-5 grades, has the characteristic of a skeleton compact structure, and slowly attenuates the structural depth of the antiskid anti-cracking overlay coating in the later operation process.
Furthermore, the paving thickness of the antiskid anti-cracking functional finish coat is 0.5-1.5 cm.
Further, the waterproof bonding layer material is one of second-order water-based resin asphalt or water-based epoxy asphalt, and the spreading amount is 0.3-1.2 kg/m2。
Furthermore, the crack is treated by adopting trenchless grouting and crack pouring, and the crack filling material is a foamed polyurethane material and is formed by mixing A, B two components according to the proportion of 45: 55.
Has the advantages that:
1. the functional layer of the utility model has high bonding strength of the surface of the antiskid and anti-crack functional layer of the pavement, has excellent performances of rutting resistance, crack resistance, flying resistance and water damage resistance, can effectively protect the original pavement structure, can delay the crack from expanding to the surface of the pavement, and prolongs the service life of the pavement.
2. Through the dual treatment of trenchless crack pouring grouting and epoxy resin emulsified asphalt overlay, the defects of cracks, aging and the like of the original pavement can be effectively treated, the structural strength of the pavement material is improved, and the structural depth and the friction coefficient of the pavement are improved.
3. The construction is convenient and fast, the construction speed is high, the epoxy resin emulsified asphalt overlay adopts a cold mixing and cold paving process, harmful smoke emission is avoided in the construction process, and the traffic can be opened within 2 hours after the construction.
4. The thickness of the cover surface is 0.5-1.5 cm, the thickness of the whole cover surface is extremely thin, the bridge dead load can be reduced for the paving cover surface of special road sections such as bridge tunnels, the original pavement elevation is hardly influenced, the use of stones is reduced, the maintenance cost is saved, the low carbon and environment protection effects are realized, the energy is saved, the emission is reduced, and the economic benefit and the environmental benefit are obvious.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
The pavement structure with the antiskid anti-cracking functional layer top facing of the embodiment comprises an antiskid anti-cracking functional top facing 1, a waterproof bonding layer 2 and an original pavement 3, wherein the original pavement 3 is provided with grouting cracks 4. The manufacturing and testing processes are as follows:
example 1
The pavement antiskid anti-cracking functional layer overlay is applied to a test section for quickly treating pavement cracks and quickly improving the pavement antiskid performance, the test section is 2km long, grouting cracks 4 of an original pavement 3 are subjected to trenchless grouting treatment, a grouting material is foamed polyurethane, then a waterproof bonding layer 3 is constructed, and finally, cold-mixed antiskid anti-cracking functional overlay 1 is constructed.
(1) Non-excavation crack pouring grouting construction:
1) detecting the trend of the pavement cracks by adopting a radar, analyzing the pavement cracking condition, selecting the cracks penetrating to the base layer as a processing object, marking the drilling positions, and distributing holes along the cracks, wherein the distance between adjacent holes is 50 cm;
2) drilling along the marked position by using a drilling machine, wherein the diameter of a drill bit is 20mm, the drilling angle is vertical, and the drill bit drills to the bottom of the upper base layer with the depth of about 40 cm;
3) the gun head and the protection tube are fixed by using the flat-mouth locking pliers. Holding the gun by one hand, pressing the gun body by the other hand, pulling the trigger, observing the pressure simultaneously, adopting the pressure and the slurry overflow control as the conditions for stopping grouting:
a) stopping grouting when grouting materials overflow from the periphery of the drill hole;
b) and the field grouting adopts a low-pressure grouting mode, the pressure in the normal grouting process is 0.5MPa, and the grouting valve is closed after the instantaneous pressure exceeds 1.5MPa, so that the grouting is stopped.
4) In order to ensure that the slurry can fully permeate into the base layer cracks and prevent the slurry from overflowing from the upper part of the grouting hole, the protective tube is clamped by a flat nozzle strong pliers, and the slurry can be removed after hole sealing is carried out for 3-5 min.
5) Recovering the pavement, removing the protective pipe above the grouting hole after grouting for 5-10min, timely removing crack repairing materials overflowing from the pavement surface, repairing the pavement drilled hole by adopting cold-patch materials, brushing a layer of protective agent on the crack surface, and recovering the original appearance after the protective agent is demulsified.
(2) Construction of anti-crack and anti-skid functional layer cover surface
1) Waterproof adhesive layer 2: cleaning original pavement 3, spreading non-stick wheel emulsified asphalt with spreading amount of 0.5kg/m2；
2) Constructing an antiskid anti-cracking functional cover coat 1: the cold mixing and cold spreading mode is adopted for spreading, the grading design is SMA-5, the cementing material is epoxy resin emulsified asphalt, and the spreading thickness is 1.0 cm.
Example 2
The crack treatment and anti-skid overlay technology is applied to a certain trunk road, the test section is 3km long, the crack is filled with a foaming polyurethane material, then the construction of a waterproof bonding layer is carried out, and finally the cold-mixing cold-paving anti-skid anti-crack functional layer overlay construction is carried out, so that the rapid crack treatment and the improvement of the anti-skid performance of the road surface are completed.
(1) Non-excavation crack pouring grouting construction
1) And detecting the trend of the pavement cracks by adopting a radar, analyzing the pavement cracking condition, selecting the cracks penetrating through the base layer as a processing object, marking the drilling positions, and distributing holes along the cracks, wherein the distance between adjacent holes is 50 cm.
2) And drilling along the marked part by using a drilling machine, wherein the diameter of a drill bit is 20mm, the drilling angle is vertical, and the drill bit drills to the bottom of the upper base layer and has the depth of about 35 cm.
3) The gun head and the protection tube are fixed by using the flat-mouth locking pliers. Holding the gun by one hand, pressing the gun body by the other hand, pulling the trigger, observing the pressure simultaneously, adopting the pressure and the slurry overflow control as the conditions for stopping grouting:
a) stopping grouting when grouting materials overflow from the periphery of the drill hole;
b) and in-situ grouting is preferably performed in a low-pressure grouting mode, the pressure in the normal grouting process is 0.5MPa, and the grouting valve is closed after the instantaneous pressure exceeds 1.5MPa, so that grouting is stopped.
4) In order to ensure that the slurry can fully permeate into the base layer cracks and prevent the slurry from overflowing from the upper part of the grouting hole, the protective tube is clamped by the flat nozzle powerful pliers, and the slurry can be removed after hole sealing is carried out for 5 min.
5) Recovering the pavement, removing the protective pipe above the grouting hole after grouting for 8-10min, timely removing crack repairing materials overflowing from the pavement surface, repairing the pavement drilled hole by adopting cold-patch materials, brushing a layer of protective agent on the crack surface, and recovering the original appearance after the protective agent is demulsified. And after the crack 4 is grouted, performing finish coat construction on the anti-cracking and anti-sliding functional layer.
(2) Construction of anti-crack and anti-skid functional layer cover surface
1) Waterproof adhesive layer 2: 3, cleaning the original pavement, and spraying water-based epoxy asphalt with the spraying amount of 1.0kg/m2
2) Constructing an antiskid anti-cracking functional cover coat 1: paving an anti-crack and anti-skid functional layer by adopting a cold mixing and cold paving mode, wherein the grading design is UTAC-5, the cementing material is epoxy resin emulsified asphalt, and the paving thickness is 1.5 cm.
The road non-excavation grouting foaming polyurethane material mainly comprises a component A and a component B, and the specific technical indexes are shown in the following table:
TABLE 1 technical requirements of A component of road trenchless foamed polyurethane material
| Technical index | Unit of | The technical requirements of the component A | Test method |
| Appearance of the product | / | Milky white liquid | Visual inspection of |
| Density (23 ℃ C.) | g/ml | 1.20-1.50 | GB/T 13354 |
| Viscosity (23 ℃ C.) | mPa·s | ＜900 | GB/T 2794 |
TABLE 2 technical requirements of component B of road trenchless foamed polyurethane material
| Technical index | Unit of | The technical requirements of the component B | Test method |
| Appearance of the product | / | Dark brown clear liquid | Visual inspection of |
| Density (23 ℃ C.) | g/ml | 1.05-1.20 | GB/T 33312 |
| Viscosity (23 ℃ C.) | mPa·s | ＜500 | GB/T 12009.3 |
TABLE 3 technical requirements of road trenchless foamed polyurethane material
| Technical index | Unit of | Technical requirements | Test method |
| Gel time (23 ℃ C.) | s | 45-120 | HG/T 4574 |
| Debonding time (23 ℃ C.) | s | 50-180 | HG/T 4574 |
| Hardening time (23 ℃ C.) | min | ＜120 | JC/T 975 |
| Expansion ratio | Multiple times | ＜3.0 | GB/T 6343 |
| Shear strength (23 ℃ C.) | MPa | ＞1 | / |
| Adhesive Strength (23 ℃ C.) | MPa | ＞1 | JC/T975 |
| Compressive strength at 70% stress deformation | MPa | ＞3.0 | GB/T8813 |
| Water swelling power | Multiple times | ＜3.0 | GB/T 6343 |
The technical indexes of the water-based epoxy asphalt for the waterproof bonding layer are shown in the following table:
TABLE 4 technical indices of aqueous epoxy asphalt
The technical indexes of the second-order water-based resin asphalt for the waterproof bonding layer are as follows:
TABLE 5 second order Water-based resin asphalt technical index
TABLE 6 Cold-mix Cold-spread anti-skid anti-crack mixture Performance index
By combining the examples 1 and 2, the treated pavement has no crack generation and crack propagation which is not reflected to the pavement finish coat through field detection, the anti-skid pendulum value is more than 55, the structural depth of the finish coat is attenuated by 0.1, the attenuation is slow, the anti-skid performance of the original pavement can be well improved, and the utility model has wide popularization and application values.
Claims (6)
1. The utility model provides a road surface structure with anti functional layer top facing of anti splitting of antiskid which characterized in that: the anti-skid anti-cracking road surface comprises an anti-skid anti-cracking functional cover surface layer (1), a waterproof bonding layer (2) and an original road surface (3), wherein the original road surface (3) is provided with grouting cracks (4).
2. The pavement structure provided with an antiskid and anti-cracking functional layer overlay according to claim 1, characterized in that: the waterproof bonding layer (2) is made of second-order water-based resin asphalt or water-based epoxy asphalt, and the spraying amount is 0.3-1.2 kg per square meter.
3. The pavement structure provided with an antiskid and anti-cracking functional layer overlay according to claim 1, characterized in that: the antiskid anti-cracking functional finish coat (1) adopts epoxy resin emulsified asphalt.
4. The pavement structure provided with an antiskid and anti-cracking functional layer overlay according to claim 1, characterized in that: the antiskid anti-crack functional finish coat (1) adopts SMA-5 or UTAC-5 gradation.
5. The pavement structure provided with an antiskid and anti-cracking functional layer overlay according to claim 1, characterized in that: the paving thickness of the antiskid anti-cracking functional finish coat (1) is 0.5-1.5 cm.
6. The pavement structure provided with an antiskid and anti-cracking functional layer overlay according to claim 1, characterized in that: and the crack of the original pavement (3) is treated by non-excavation grouting crack pouring, and the crack pouring material is a foamed polyurethane material.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114875786A (en) * | 2022-06-16 | 2022-08-09 | 保利长大工程有限公司 | Construction method of temporary traffic bridge floor based on UTAC-5 ultrathin asphalt wearing layer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114875786A (en) * | 2022-06-16 | 2022-08-09 | 保利长大工程有限公司 | Construction method of temporary traffic bridge floor based on UTAC-5 ultrathin asphalt wearing layer |
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