CN212270570U - Tunnel flame-retardant warm mix asphalt pavement paving structure - Google Patents
Tunnel flame-retardant warm mix asphalt pavement paving structure Download PDFInfo
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- CN212270570U CN212270570U CN202020647313.7U CN202020647313U CN212270570U CN 212270570 U CN212270570 U CN 212270570U CN 202020647313 U CN202020647313 U CN 202020647313U CN 212270570 U CN212270570 U CN 212270570U
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Abstract
The utility model discloses a tunnel flame-retardant warm mix asphalt pavement paving structure, which comprises a flame-retardant warm mix smoke-suppressing asphalt surface layer, a waterproof adhesive layer, a concrete base layer, a leveling layer and a roadbed from top to bottom in sequence; the flame-retardant warm-mix smoke-suppressing asphalt surface layer comprises a flame-retardant warm-mix smoke-suppressing asphalt upper surface layer, a flame-retardant asphalt sticky layer and a warm-mix smoke-suppressing anti-rutting asphalt lower surface layer or a flame-retardant warm-mix smoke-suppressing anti-rutting asphalt lower surface layer. The tunnel flame-retardant warm mix asphalt pavement paving structure has the following advantages: (1) the flame retardant has excellent flame retardant property and fire resistance, and can improve the safety of the tunnel pavement in the operation period; (2) the material has high integral rigidity, strong anti-reflection crack capability and good flatness; (3) the asphalt surface layer construction temperature can be reduced, the pollution discharge is reduced, the construction energy is saved, and the personnel health is guaranteed.
Description
Technical Field
The utility model relates to a bituminous paving field, in particular to fire-retardant warm mix bituminous paving structure in tunnel.
Background
The urban tunnel is used as a control point of regional traffic, effectively improves the problem of urban traffic jam and is also a region where accidents easily occur. Due to the long and narrow closed space structure of the tunnel, the damage caused by fire is the largest in the event of a tunnel accident. When a tunnel fire occurs, because the tunnel is long and narrow and closed, the heat conductivity of surrounding rocks is poor, an outlet is limited, the convection heat dissipation rate is slow, smoke and heat generated by the fire are accumulated in the tunnel, the ambient temperature in the tunnel rises quickly, inflammable materials in the tunnel are easily ignited, a new ignition point is formed, and the scale of the fire is continuously expanded; in addition, fire smoke containing a large amount of toxic and harmful components is not easy to be discharged, the sight of people suffering from disasters and rescuers is affected, and great difficulty is brought to people evacuation and safe rescue.
The asphalt pavement has excellent comprehensive pavement performance and is the preferred pavement structure of high-grade highways and highway tunnels. In tunnel engineering built in China after 2000 years, most of the tunnel engineering is in an asphalt pavement structure. However, the tunnel asphalt pavement also has the defects that the tunnel asphalt pavement mainly comprises the following two aspects: firstly, as a temperature sensitive material, in order to ensure the workability of the material in the mixing and compacting processes, the mixture needs to be heated to a higher temperature, so that a large amount of hot smoke is generated, and the construction environment which is relatively closed in a tunnel is difficult to effectively discharge, so that the construction difficulty is increased, and the adverse effect on the health of constructors is also caused; and secondly, as an organic high polymer material, the asphalt has obvious flammability, and when a fire disaster happens, the asphalt pavement becomes a second fire source and releases a large amount of toxic dense smoke. Therefore, it is necessary to reduce the mixing temperature of the asphalt mixture and improve the fire resistance and service performance of the asphalt pavement.
201010236468.2 discloses a flame-retardant asphalt pavement structure suitable for tunnel with super large cross section and its construction method. The flame-retardant asphalt pavement structure comprises a porous concrete drainage base layer, a continuous reinforced concrete layer and a flame-retardant smoke-suppressing asphalt layer. Wherein the flame-retardant smoke-inhibiting asphalt layer is realized by adding an aluminum hydroxide flame retardant with the asphalt dosage of 20 percent into a common asphalt mixture. The invention does not consider the particularity of tunnel pavement construction, and neglects the influence of a large amount of asphalt smoke generated in the hot-mix asphalt concrete construction on the safety construction and the health of operators.
201510240556.2 discloses a durable tunnel pavement structure, which comprises, from bottom to top, a rubber asphalt macadam seal, a perfusion type semi-flexible mixture pavement lower layer, a modified emulsified asphalt bonding layer and a high-modulus warm-mix flame-retardant asphalt mixture pavement upper layer. The main structure of the asphalt surface layer is only designed, the requirement of various basic conditions of the tunnel cannot be met, and the reasonable design of the base layer is lacked.
201521020765.8 discloses a novel tunnel composite pavement structure, which comprises an asphalt concrete surface layer, a base layer and a cushion layer from top to bottom, wherein the surface layer structure comprises a warm mix flame retardant modified asphalt concrete upper surface layer of 4-6 cm and a semi-flexible asphalt concrete lower surface layer of 6-10 cm, the base layer adopts 25-30 cm continuous reinforced concrete, and the cushion layer adopts 15-20 cm graded broken stone or unscreened broken stone. The utility model discloses an engineering implementation needs a large amount of aggregates, and the excessive exploitation of natural aggregate can cause ecological environment's destruction, under the environmental protection policy that tends to be strict day by day, the source and the supply that natural aggregate lack stability.
Therefore, the novel tunnel flame-retardant warm mix asphalt pavement paving structure is provided, which is beneficial to the environmental protection construction and the safe operation of urban tunnel pavement engineering, solves the problem of shortage of raw material sources, ensures the health of constructors, promotes the service performance and the durability of tunnel pavements, and provides sufficient guarantee for the engineering quality and the use safety of urban tunnels.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problem, the utility model provides a fire-retardant warm mix asphalt pavement structure in tunnel should mat formation the structure and can overcome the shortcoming that fire-resistant security is not high, the construction flue gas is big, raw and other materials supply is unstable in the structure of current city tunnel pavement to realize the high-efficient fire behaviour of city tunnel pavement structure, environmental protection and energy saving construction, the target of safe and durable operation. To achieve this object:
the utility model provides a fire-retardant warm mix asphalt pavement structure in tunnel, structure top-down of mating formation includes fire-retardant warm mix in proper order and presses down cigarette pitch surface course, waterproof adhesion layer, concrete-based layer, levelling layer and road bed, its characterized in that: the flame-retardant warm-mix smoke-suppressing asphalt surface layer sequentially comprises a flame-retardant warm-mix smoke-suppressing asphalt upper surface layer, a flame-retardant asphalt adhesive layer and a warm-mix smoke-suppressing anti-rutting asphalt lower surface layer or a flame-retardant warm-mix smoke-suppressing anti-rutting asphalt lower surface layer from top to bottom; the roadbed comprises a soil foundation and bedrocks.
The utility model discloses a further improvement, fire-retardant warm mix presses down cigarette pitch upper strata to be mixed by adding fire retardant or flame retardant fiber or warm mix agent or epoxy component in one or several kinds of compositions fire-retardant warm mix presses down cigarette pitch mixture and paves and form, its thickness is 20 ~ 60 mm.
The utility model discloses a further improvement, warm mix presses down cigarette anti-rutting asphalt lower surface course and presses down cigarette anti-rutting asphalt mixture by adding warm mix agent and anti-rutting agent warm mix and pave and form, and its thickness is 20 ~ 100 mm.
The utility model discloses a further improvement, fire-retardant warm mix presses down cigarette anti-rutting asphalt lower surface course and mixes the anti-rutting bituminous mixture that presses down cigarette by adding warm mix agent, anti-rutting agent and fire retardant or fire-retardant fiber or epoxy component in one or several kinds of compositions and pave and form, its thickness is 20 ~ 100 mm.
The utility model discloses a further improvement, concrete basic unit is by ordinary concrete or reinforced concrete or continuous reinforced concrete or steel fibre reinforced concrete pavement, and its thickness is 150 ~ 300 mm; the leveling layer is formed by paving roller compacted concrete or lean concrete or graded broken stones, and the thickness of the leveling layer is 100-250 mm; the aggregate adopted by the concrete and the graded macadam is natural aggregate or regenerated aggregate or steel slag.
The utility model provides a fire-retardant warm mix asphalt pavement structure in tunnel compares with prior art, the utility model has the advantages of as follows and beneficial effect:
by adopting the tunnel flame-retardant warm mix asphalt pavement paving structure, the upper flame-retardant warm mix smoke-suppressing asphalt layer, the flame-retardant asphalt adhesive layer and the lower flame-retardant warm mix smoke-suppressing anti-rutting asphalt layer have excellent flame-retardant performance and fire-resistant performance, and the safety of the urban tunnel asphalt pavement in the operation period can be improved; the lower surface layer of the warm-mix smoke-inhibiting anti-rutting asphalt or the lower surface layer of the flame-retardant warm-mix smoke-inhibiting anti-rutting asphalt has excellent anti-rutting performance, so that the pavement structure can bear the canalization traffic effect; the flame-retardant asphalt sticky layer is used for ensuring the interlayer combination of the asphalt upper surface layer and the asphalt lower surface layer and ensuring the stress integrity of the asphalt surface layer; the waterproof adhesive layer ensures the interlayer combination between the asphalt surface layer and the concrete base layer, improves the stress state of the asphalt surface layer and reduces the adverse effect of water on the base layer and the roadbed; the concrete base layer and the leveling layer enable the pavement structure to have high overall rigidity and strong anti-reflection crack capacity, and the aggregate uses industrial wastes such as regenerated aggregate and steel slag, so that the mining requirement on natural aggregate can be reduced, and a new green development concept is embodied; the asphalt surface layer adopts a warm mixing technology, so that the construction temperature of the asphalt surface layer can be reduced, the pollution discharge is reduced, the construction energy is saved, and the health of construction operators is ensured.
Drawings
The above and other aspects and advantages of the present invention will become more apparent and readily appreciated from the detailed description taken in conjunction with the following drawings, which are given by way of illustration only and not by way of limitation, wherein:
FIG. 1 is a schematic cross-sectional view of a tunnel flame-retardant warm mix asphalt pavement paving structure of the utility model;
in the drawings, the pavement structure represented by each reference numeral comprises the following components:
1. the anti-smoke and anti-rutting asphalt comprises a flame-retardant warm-mix smoke-suppressing asphalt surface layer, 101, 102, a flame-retardant warm-mix smoke-suppressing asphalt upper surface layer, 103, a warm-mix smoke-suppressing and anti-rutting asphalt lower surface layer or a flame-retardant warm-mix smoke-suppressing and anti-rutting asphalt lower surface layer, 2, a waterproof adhesive layer, 3, a concrete base layer, 4, a leveling layer, 5 and a roadbed.
Detailed Description
The invention will be described in further detail with reference to the following detailed description and accompanying drawings:
the utility model provides a fire-retardant warm mix asphalt pavement structure in tunnel should mat formation the structure and can overcome the shortcoming that fire-resistant security is not high, the construction flue gas is big, raw and other materials supply is unstable among the current city tunnel pavement structure to realize the target of high-efficient fire behaviour, environmental protection and energy saving construction, the safe and durable operation of city tunnel pavement structure.
Example 1
As shown in fig. 1, the tunnel flame-retardant warm mix asphalt pavement paving structure of the utility model comprises a flame-retardant warm mix smoke-suppressing asphalt surface layer 1, a waterproof adhesive layer 2, a concrete base layer 3, a leveling layer 4 and a roadbed 5 from top to bottom, wherein the flame-retardant warm mix smoke-suppressing asphalt surface layer 1 comprises a flame-retardant warm mix smoke-suppressing asphalt upper surface layer 101, a flame-retardant asphalt adhesive layer 102 and a flame-retardant warm mix smoke-suppressing anti-rutting asphalt lower surface layer 103 from top to bottom; the upper layer thickness of the flame-retardant warm-mix smoke-suppressing asphalt is 40mm, the lower layer thickness of the flame-retardant warm-mix smoke-suppressing anti-rutting asphalt is 60mm, the thickness of the concrete base layer is 200mm, the thickness of the leveling layer is 150mm, the roadbed is bedrock, and the rock mass level of the bedrock is higher than IV level.
Further, the flame-retardant warm-mix smoke-suppressing asphalt upper layer 101 is formed by paving a flame-retardant warm-mix smoke-suppressing asphalt mixture, the flame-retardant warm-mix smoke-suppressing asphalt mixture is prepared by adding a flame retardant, flame-retardant fibers and a warm-mix agent into an asphalt mixture, SMA gradation is adopted, the nominal maximum particle size of aggregate is 13.2mm, the oxygen index of the aggregate is not less than 23%, the smoke density grade is less than 75, and the paving temperature is 140-150 ℃; the lower flame-retardant warm-mix smoke-inhibiting and anti-rutting asphalt surface layer 103 is formed by paving a flame-retardant warm-mix smoke-inhibiting and anti-rutting asphalt mixture, the flame-retardant warm-mix smoke-inhibiting and anti-rutting asphalt mixture is prepared by adding a flame retardant, flame-retardant fibers, a warm-mix agent and an anti-rutting agent into the asphalt mixture, an AC (alternating Current) grading is adopted, the nominal maximum particle size of aggregate is 16mm, the oxygen index of the aggregate is not less than 23%, the smoke density grade is less than 75, the paving temperature is 140-150 ℃, the dynamic stability at 60 ℃ is greater than 6000 times/mm, and the dynamic stability at 70 ℃ is greater than 1500 times/mm.
Further, the concrete base layer 3 is formed by paving common concrete, wherein the 28d compressive strength of the common concrete is more than 40MPa, and the 28d bending tensile strength is more than 5 MPa; the leveling layer 4 is formed by paving steel slag lean concrete, the 28d compressive strength of the steel slag lean concrete is more than 18MPa, the 28d bending tensile strength of the steel slag lean concrete is more than 2.8MPa, the steel slag doped in the steel slag lean concrete meets the requirements of the particle size range of 10-30 mm and the apparent density of not less than 3.0 multiplied by 103kg/m3The water swelling rate is not more than 2.0% and the crushing value is not more than 8%.
Further, the flame-retardant asphalt adhesive layer 102 is made of flame-retardant emulsified asphalt, and the spreading amount of the flame-retardant emulsified asphalt is 0.8L/m2(ii) a The waterproof bonding layer 2 is formed by paving an asphalt macadam seal layer; the asphalt macadam seal coat adopts asphalt and asphalt ready-mixed macadam, and the asphalt spreading amount is 1.2kg/m2The asphalt pre-mixed crushed stone is pre-mixed by 5-10 mm basalt or hard limestone crushed stone and 0.6% asphalt, and the spreading amount of the asphalt pre-mixed crushed stone is 12kg/m2。
Example 2
As shown in fig. 1, the tunnel flame-retardant warm mix asphalt pavement paving structure of the utility model comprises a flame-retardant warm mix smoke-suppressing asphalt surface layer 1, a waterproof adhesive layer 2, a concrete base layer 3, a leveling layer 4 and a roadbed 5 from top to bottom, wherein the flame-retardant warm mix smoke-suppressing asphalt surface layer 1 comprises a flame-retardant warm mix smoke-suppressing asphalt upper surface layer 101, a flame-retardant asphalt adhesive layer 102 and a warm mix smoke-suppressing anti-rutting asphalt lower surface layer 103 from top to bottom; the upper layer thickness of the flame-retardant warm-mix smoke-suppressing asphalt is 40mm, the lower layer thickness of the warm-mix smoke-suppressing anti-rutting asphalt is 80mm, the thickness of the concrete base layer is 250mm, the thickness of the leveling layer is 150mm, the roadbed is a soil foundation, and the resilience modulus of the soil foundation is not less than 30 MPa.
Further, the upper flame-retardant warm-mix smoke-suppressing asphalt layer 101 is formed by paving a flame-retardant warm-mix smoke-suppressing asphalt mixture, the flame-retardant warm-mix smoke-suppressing asphalt mixture is prepared by adding an epoxy component, a flame retardant and a warm-mix agent into an asphalt mixture, and is prepared by adopting AC grading, wherein the nominal maximum particle size of aggregate is 13.2mm, the oxygen index of the aggregate is not less than 23%, the smoke density grade is less than 75, and the paving temperature is 140-150 ℃; the warm-mixed smoke-inhibiting anti-rutting asphalt lower surface layer 103 is formed by paving a warm-mixed smoke-inhibiting anti-rutting asphalt mixture, the warm-mixed smoke-inhibiting anti-rutting asphalt mixture is prepared by adding a warm-mixing agent and an anti-rutting agent into the asphalt mixture, the super-pave grading is adopted, the nominal maximum particle size of aggregate is 19mm, the paving temperature is 140-150 ℃, the dynamic stability at 60 ℃ is more than 6000 times/mm, and the dynamic stability at 70 ℃ is more than 1500 times/mm.
Further, the concrete base layer 3 is formed by paving continuous reinforced concrete, the longitudinal reinforcement ratio of the continuous reinforced concrete is 0.8%, and the longitudinal and transverse reinforcements of the continuous reinforced concrete adopt twisted reinforcements with the diameter of 18 mm; the leveling layer 4 is formed by paving graded broken stones, and the resilience modulus of the graded broken stones is larger than 300 MPa.
Further, the flame-retardant asphalt adhesive layer 102 is made of flame-retardant emulsified asphalt, the flame-retardant emulsified asphalt is prepared by adding a flame retardant into emulsified asphalt, and the spreading amount of the flame-retardant emulsified asphalt is 1.0L/m2(ii) a The waterproof bonding layer 2 is made of a reaction type waterproof bonding material; the bonding strength of the reactive waterproof bonding material at 25 ℃ is not less than 1.0MPa, the bonding strength at 60 ℃ is not less than 0.4MPa, and the spreading amount is 0.2-0.8 kg/m2(ii) a The technical indexes of the reactive waterproof adhesive material are shown in table 1.
TABLE 1 technical indices of reactive waterproof adhesive materials
| Item | Index (I) |
| Appearance of the product | Black viscous liquid |
| Bond strength, 25 deg.C | ≥1.0MPa |
| Bond strength, 60 deg.C | ≥0.4MPa |
| Shear strength, 25 deg.C | ≥1.0MPa |
| Heat resistance | 160 +/-2 deg.c, no flow and no sliding |
| Water impermeability | 0.3MPa water pressure for 30min water seepage resistance |
| Resistance to puncture | After exposure to a wheel-milling test (0.7MPa, 100 times), water seepage is prevented at a water pressure of 0.3MPa |
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, but also to cover any modifications or equivalent changes made in the technical spirit of the present invention, which fall within the scope of the present invention.
Claims (5)
1. The utility model provides a fire-retardant warm asphalt pavement structure of mixing in tunnel, the structure of mating formation top-down includes fire-retardant warm mix presses down cigarette pitch surface course, waterproof adhesive layer, concrete-based layer, leveling layer and road bed, its characterized in that in proper order: the flame-retardant warm-mix smoke-suppressing asphalt surface layer sequentially comprises a flame-retardant warm-mix smoke-suppressing asphalt upper surface layer, a flame-retardant asphalt adhesive layer and a warm-mix smoke-suppressing anti-rutting asphalt lower surface layer or a flame-retardant warm-mix smoke-suppressing anti-rutting asphalt lower surface layer from top to bottom; the roadbed comprises a soil foundation and bedrocks.
2. The tunnel flame-retardant warm mix asphalt pavement structure according to claim 1, characterized in that: the upper surface layer of the flame-retardant warm-mix smoke-suppressing asphalt is formed by paving a flame-retardant warm-mix smoke-suppressing asphalt mixture added with one or more of flame retardant, flame-retardant fiber, warm-mix agent and epoxy component, and the thickness of the upper surface layer is 20-60 mm.
3. The tunnel flame-retardant warm mix asphalt pavement structure according to claim 1, characterized in that: the lower surface layer of the warm-mixed smoke-inhibiting anti-rutting asphalt is formed by paving a warm-mixed smoke-inhibiting anti-rutting asphalt mixture added with a warm-mixed agent and an anti-rutting agent, and the thickness of the lower surface layer is 20-100 mm.
4. The tunnel flame-retardant warm mix asphalt pavement structure according to claim 1, characterized in that: the lower surface layer of the flame-retardant warm-mix smoke-suppressing anti-rutting asphalt is formed by paving a flame-retardant warm-mix smoke-suppressing anti-rutting asphalt mixture added with one or more of a warm-mix agent, an anti-rutting agent and a flame retardant or flame-retardant fibers or epoxy components, and the thickness of the lower surface layer is 20-100 mm.
5. The tunnel flame-retardant warm mix asphalt pavement structure according to claim 1, characterized in that: the concrete base layer is formed by paving common concrete or reinforced concrete or continuous reinforced concrete or steel fiber reinforced concrete, and the thickness of the concrete base layer is 150-300 mm; the leveling layer is formed by paving roller compacted concrete or lean concrete or graded broken stones, and the thickness of the leveling layer is 100-250 mm; the aggregate adopted by the concrete and the graded macadam is natural aggregate or regenerated aggregate or steel slag.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020647313.7U CN212270570U (en) | 2020-04-24 | 2020-04-24 | Tunnel flame-retardant warm mix asphalt pavement paving structure |
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| CN202020647313.7U CN212270570U (en) | 2020-04-24 | 2020-04-24 | Tunnel flame-retardant warm mix asphalt pavement paving structure |
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