CN103194946B - Cement concrete bridge deck pavement structure capable of being applied to extreme operating environments - Google Patents
Cement concrete bridge deck pavement structure capable of being applied to extreme operating environments Download PDFInfo
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- CN103194946B CN103194946B CN201310140156.5A CN201310140156A CN103194946B CN 103194946 B CN103194946 B CN 103194946B CN 201310140156 A CN201310140156 A CN 201310140156A CN 103194946 B CN103194946 B CN 103194946B
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Abstract
The invention discloses a cement concrete bridge deck pavement structure capable of being applied to extreme operating environments (high temperature, raininess and moist), belonging to the technical field of bridge deck pavement. In the pavement process, a cement concrete bridge deck slab is subjected to scabbling and shot blasting treatment; a waterproof system, a multi-function layer, an anti-shearing layer and an anti-wearing layer are arranged on the cement concrete bridge deck slab from bottom to top; modified emulsified asphalt bonding layers are arranged between the multi-function layer and the anti-shearing layer, and between the anti-shearing layer and the anti-wearing layer, and lateral single-particle-size pre-mixing gravel drain blind ditches and a direct-releasing drain holes are formed in the side edge of the bridge deck. Compared with the prior art, the cement concrete bridge deck pavement structure has the advantages that the bridge deck pavement disease, especially early damage cause are considered, the structure and material design is implemented according to the concept of the cement concrete bridge deck pavement layering function, not only is the joint between the pavement layer and the cement concrete face enhanced, but also the high-temperature stabilizing effect and the water preventing and discharging effect of the mixture of a surface layer are strengthened, the endurance quality of the pavement layer structure is improved, and the popularization and application value is good.
Description
Technical field
The present invention relates to a kind of deck paving technology, specifically a kind of cement concrete bridge deck paving structure that can be applicable to extreme environment for use.
Background technology
Deck paving is an extremely complicated multidirectional stressed structure, and influence factor is intricate, and macro manifestations is also different.The destruction attribution of deck paving is material of paving course under the coupling of load and environment, the variation of mechanical characteristic (stress, strain) or the reduction of function, and main manifestations is four aspects: 1. visco-plasticity permanent deformation; 2. fatigue cracking; 3. shear failure; 4. local assault fragmentation and fracture.Especially rainy at summer high temperature, winter severe cold is freezing, under the extreme environmental conditions such as the molten corrosion of seawater salt and Heavy Traffic, above-mentioned mode of failure more easily occurs.
The appearance of above-mentioned bridge deck damage form, both relevant with the comprehensive function of carload in operation process and water, again with compound gather materials characteristic and gradation design relevant, the more important thing is, dynamics and the system of the thinking that pave-load layer designs and construction control perfect the decisive action that the behavior in service of degree to bridge deck pavement has essence:
(1) load and weather conditions are on the impact of bridge deck damage
Investigation finds, the pass through difference of load of deck paving design load and reality is huge, the single shaft two-wheel group that current bridge floor asphalt concrete pavement design adopts axle to carry 100kN is proof load, and in actual current process, vehicle maximizes and the ratio of overload heavy-duty vehicle constantly increases, and the weigh vehicle of 200kN ~ 300kN of single shaft axle is not within minority, and this has increased the weight of the stress burden that former design is mated formation undoubtedly, layer in and interlaminar shear stress be doubled and redoubled, accelerate the destruction of pave-load layer.
Weather conditions have direct impact to deck paving, and wherein the effect of temperature and precipitation is the most important.
(2) design of material is on the impact of bridge deck damage
The infiltration of moisture is the principal element causing deck paving generation earlier period damage, after moisture infiltrates along pave-load layer crack or compound UNICOM space, pitch and building stones, adhesive attraction between compound and compound can be destroyed, when penetrating into the inner and cement concrete bridge deck of asphalt surface course and pave-load layer interface, interface bond strength can be made to reduce, make pave-load layer lose intensity and waterproof ability.Be not difficult to find out from existing specification of mating formation, the discussion of pave-load layer structure has mainly been done to the explanation of regulation compared with principle and directiveness to material therefor, way and thickness etc., and do not give elaboration about concrete design theory and method as the Mechanical Calculation and Analysis of pave-load layer, drainage system are arranged etc., the appointment of the deck paving design and construction technical manual of system, specification is formulated extremely urgent.
(3) water-proof system or water-proof tack coat overall performance weakness are not set
For concrete slab, due to the wayward property of temperature and Shi Hanzhang stretch-draw in construction and maintenance processes, often there is fine fisssure defect to a certain degree in bridge deck.By finding the analysis of a large amount of bridge collapse origin cause of formation, the design of China's deck paving experienced by one without water-proof tack coat-mulseal tack coat-heated bitumen, the process of coating and coiled material class water-proof tack coat-diversified water-proof binding system, deck paving design particularly before 2000, water layer how in the air or only at pave-load layer and bridge deck combination interface place spread one deck plain asphalt or mulseal adhesion coating between pave-load layer, with oil mass be difficult to control and easily higher, softening point is on the low side, high temperature is very easily softening and become lubricating layer, mulseal water stability is poor simultaneously, in recent years domestic Ye You research unit has researched and developed some as polymer modified asphalt class (solvent-borne type or latex class), the flexible water binding materials such as polyurethane or epoxy resin asphalt class (solvent-borne type), construction thickness mostly is 1.0 ~ 1.5mm, such material is present between pave-load layer and bridge deck with the pattern of fexible film, the waterproof at the bridge floor position existed there being crack is still without too positive effect.And extremely easily destroyed (as mixed material truck wheel is taken away) by subsequent construction.
(4) construction control is on the impact of bridge deck damage
Bridge floor processing mode is improper, and failing provides good boundary condition.
Interface processing mode ensures to connect good basis between pave-load layer and bridge deck, current conventional bridge floor processing mode mainly contains milling, dabbing, sandblasting, ball blast etc., the operability of these construction technologies, mechanization degree, the feature had nothing in common with each other in the aspects such as environmental factor, deck conditions after process is also different, in current Surfacing Construction process, to the processing mode of bridge floor, treatment process, examination criteria (construction depth, roughness, uniformity) lack specific aim and systematic regulation, cause bridge floor Disposal quality very different, have impact on and the adhesive power of upper strata waterproofing course and frictional resistance.
(5) guarded drainage system imperfection causes detail structure ponding or infiltration seriously
Water is one of main inducing of deck paving damage, brings out moisture and enter after pave-load layer ftractures.Current highway asphalt pavement design criterion and construction technique normalizing etc. only propose principle requirement to the water-proof system of deck paving, this water-proof system mainly refers to the setting of scratch coat and waterproofing course, stress " protection " problem of extraneous water " after entering ", " dredging " before entering preventing extraneous water, lacks corresponding detailed design.If it is improper that the drainage system of bridge floor is arranged, the moisture entered fails to discharge in time, produces " bathtub effect ", will certainly aggravate the destruction of pave-load layer.Therefore, perfect deck paving system and waterproof, drainage system are the key measures guaranteeing bridge deck pavement service performance.
Design a kind of there is the comfortable excellent composite service performance of long-life strong durable height bridge deck pavement material and structure and the sound bridge floor hierarchy of control be the extreme environment concrete bridge deck pavement engineering field key technical problem that must solve from now on.
Summary of the invention
Technical assignment of the present invention is for above-mentioned the deficiencies in the prior art, a kind of cement concrete bridge deck paving structure that can be applicable to extreme environment for use is provided, there is long-life, by force durable, the high feature such as comfortable, can solve that summer high temperature is rainy, winter severe cold is freezing and poor, the water-soluble erosion of fatigue performance of the complicated extreme environment concrete bridge deck pavement functional layer such as the molten erosion of seawater salt and the series of key techniques problem such as bridge floor integrated disease in early days.
Technical assignment of the present invention realizes in the following manner: a kind of cement concrete bridge deck paving structure that can be applicable to extreme environment for use, after dabbing or Shot Blasting are carried out to cement concrete bridge deck plate, water-proof system, Multifunctional layered, anti-shearing layer and abrasion resisting layer is set gradually from bottom to top above cement concrete bridge deck plate, modified emulsifying asphalt adhesion coating is provided with between Multifunctional layered and anti-shearing layer and between anti-shearing layer and abrasion resisting layer, side direction simple grain footpath premixed macadam weeper drain is set at bridge floor avris and directly lets out formula drain hole
Described water-proof system comprises water-proof tack coat, and described water-proof tack coat adopts hot SBS modified bitumen or hot rubber powder modified asphalt, and hot SBS modified bitumen is according to 1.2 ~ 1.5kg/m
2scope carries out spread, and hot rubber powder modified asphalt is by 1.5 ~ 1.8kg/m
2scope carries out spread, after spread, and spreading one deck pitch premixed macadam on water-proof tack coat, ballast grain sizes 3 ~ 8mm, through weight ratio 3 ~ 5 ‰ pitch premixing;
Described Multifunctional layered adopts close water type composite modified hard grades of bitumen glue sand, described close water type composite modified hard grades of bitumen glue sand using matrix pitch, SBS modifier and natural ganoine bitumen according to a certain percentage, the composite modified hard grades of bitumen that processes of order blending, swelling growth, high speed shear as binder, the storage stability according to test determines suitable stabilizer types and volume;
Described anti-shearing layer adopts SBS modified bitumen to make cementitious matter, and nominal maximum particle diameter is the interruption compact compound of 13.2mm; Or adopting composite modified hard grades of bitumen to be cementitious matter, nominal maximum particle diameter is continuous type close-graded, the suspension-compact structure compound of 9.5mm;
Described abrasion resisting layer adopts SBS modified bitumen to make cementitious matter, and nominal maximum particle diameter is the interruption compact compound of 9.5mm;
The spread quantity of described modified emulsifying asphalt adhesion coating is 0.3 ~ 0.6L/m
2;
The width of described side direction simple grain footpath premixed macadam weeper drain is 10-20cm, above the degree of depth to Multifunctional layered, fills ballast grain sizes 10-20mm, and rubble is through weight ratio 2.5 ± 0.3% mulseal premixing.
After cement concrete bridge deck plate carries out dabbing or Shot Blasting, its roughness is preferably 0.4 ~ 1.2mm.
The grading limit of the close water type of Multifunctional layered composite modified hard grades of bitumen glue sand is preferably: 9.5mm percent of pass is 100%; 4.75mm percent of pass is 85 ~ 100%; 2.36mm percent of pass is 60 ~ 85%; 1.18mm percent of pass is 38 ~ 68%; 0.6mm percent of pass is 22 ~ 54%; 0.3mm percent of pass is 14 ~ 32%; 0.15mm percent of pass is 10 ~ 22%; 0.075mm percent of pass is 7 ~ 12%.
In the binder of the close water type of Multifunctional layered composite modified hard grades of bitumen glue sand, matrix pitch and SBS modifier are mixed to join according to the weight ratio of 95% ~ 96%:4% ~ 5% and are formed SBS modified bitumen, and the mixture proportion of SBS modified bitumen and natural ganoine bitumen is determined in conjunction with the type of natural ganoine bitumen and content of ashes.
The mixture proportion (interior volume) of different natural ganoine bitumen is: Qing Chuan kir≤7%; Xinjiang kir 6% ~ 12%, French Albanian kir 10% ~ 20%, Trinidad Lake Asphalt 15% ~ 25%; . when adopting kir impurity content (ash content) more than 10%, its mixture proportion is generally no more than 7%.
The grating of weeper drain medium stone material is preferably: between 25mm-19mm, pellet weight ratio accounts for 0-10%; 9.5mm-12.5mm between pellet ratio account for 35%-80%; Between 4.75mm-9.5mm, pellet weight ratio accounts for 10%-55%; Below 4.75mm pellet weight ratio accounts for 0-10%; Transmission coefficient is not less than 400ml/min.
For improving bridge floor lateral drainage effect, the transverse slope of 2% can be set at abrasion resisting layer end face.
Water-proof system, Multifunctional layered, anti-shearing layer, abrasion resisting layer, modified emulsifying asphalt adhesion coating and lateral drainage french drain etc. form the complete deck paving Rotating fields of the present invention: one, water-proof system adopts heat modification pitch or hot rubber powder modified asphalt to add premixed macadam, strengthens bridge floor adhesion stress and can effectively stop water to the infiltration of concrete bridge deck; Two, Multifunctional layered: close water type composite modified hard grades of bitumen glue sand, has leveling layer and takes into account strong close water function; Three, anti-shearing layer: adopt high-modulus EME or modification SMA deck, effectively can improve the bridge surface mangle that high-temperature behavior is brought in order to resist Heavy Traffic; Four, abrasion resisting layer: adopt modification SMA fine grading structure, have waterproof concurrently, improve high temperature performance, strengthen comfortableness and performance attractive in appearance etc.; Five, lateral drainage french drain and directly let out formula drain hole etc.: adopt pre-buried premixed macadam, arrange the form such as spilled water hole and transverse slope, effective and reasonable guiding face ponding and intermediary water are discharged in time.Heat modification pitch adhesion coating is increased between each layer, fully demonstrate " anti-row combines " theory of water prevention of damage by disease, from pave-load layer end face to bottom, each horizon function complements each other the safety factor increasing waterproof, has both met the design period of waterproof, more ensure the Long-Term Properties of pave-load layer.
Compared with prior art, paving structure of the present invention has following beneficial effect highlightedly:
(1) theory of pay abundant attention waterproof, consider the comprehensive functional performance of bridge floor, in conjunction with extreme environment service condition, appropriate design bridge floor Multifunctional layered structure, embodies the comprehensive pavement performances such as bridge deck water-proof, anti-high and low-temp, endurance, the molten erosion of opposing seawater salt and driving Comfortable attractive;
(2) Multifunctional layered is taken into account Mi Shui (anti-sealing and salinity is entered into cement concrete through pave-load layer, salt is produced to cement concrete and reinforcing bar and melts corrosion), levelling effect, the effect such as there is high/low temperature premium properties and antifatigue is durable;
(3) multifunctional water-proofing layer asphaltmastic bituminous cements that compound adopts is composite modified hard grades of bitumen, this more focuses on bridge deck water-proof effect and high/low temperature pavement performance result of use, the modified asphalt that middle upper layer SMA bituminous mixture adopts has more complicated more excellent mechanics functional performance, and its techno-economic effect brought can be put into practice and verify.
Accompanying drawing explanation
Accompanying drawing 1 is the structural representation that the present invention can be applicable to the cement concrete bridge deck paving structure of extreme environment for use.
Detailed description of the invention
The cement concrete bridge deck paving structure that can be applicable to extreme environment for use of the present invention is described in detail below with specific embodiment with reference to Figure of description.
Embodiment:
The present invention is formed complete deck paving Rotating fields with water-proof system 6, Multifunctional layered 5, anti-shearing layer 3, abrasion resisting layer 1, modified emulsifying asphalt adhesion coating 2, modified emulsifying asphalt adhesion coating 4 and lateral drainage french drain 8, concrete implementation step and technical requirements as follows:
1) concrete bridge deck process: cement concrete bridge deck plate 7 adopts dabbing or Shot Blasting, makes concrete surface expose fresh gathering materials and layer of concrete.Roughness after the process of employing sand patch method mensuration bridge floor, roughness acceptability limit is 0.4 ~ 1.2mm.Ball blast cast steel ball performance used meets GB6484-86, GB6485-86 requirement, and granularity is preferably 1.0 ~ 1.5mm.
2) water-proof system 6: adopt hot SBS modified bitumen or hot rubber powder modified asphalt, SBS modified asphalt technology index should meet " standard specification for construction and acceptance of highway asphalt pavement " (JTG F40-2004) and show I-D standard in 4.6.2, rubber powder modified asphalt technical indicator should meet table 1 requirement, the regulation that its test method should meet " highway engineering pitch and Asphalt Mixture Experiment code " (JTJ052-2000).
Hot SBS modified bitumen is according to 1.2 ~ 1.5kg/m
2scope carries out spread, and hot rubber powder modified asphalt is by 1.5 ~ 1.8kg/m
2scope carries out spread.After sprayed, spreading one deck pitch premixed macadam thereon, ballast grain sizes 3 ~ 8mm, and through weight ratio 3 ~ 5 ‰ pitch premixing.Hot rubber powder modified asphalt water-proof tack coat spread should adopt special, effectively can control spread dosage, has the spread equipment of heat (ensureing that heating-up temperature can reach 220 DEG C), insulation and agitating function.
The technical requirements of table 1 rubber powder modified asphalt
3) Multifunctional layered 5: adopt close water type composite modified hard grades of bitumen glue sand (3cm), its binder (composite modified asphalt) with matrix pitch, SBS modifier and natural ganoine bitumen according to a certain percentage, order blending, swelling growth, high speed shear process.Matrix pitch and SBS modifier are mixed to join according to the weight ratio of 95%:5% and are formed SBS modified bitumen, then are blended into composite modified asphalt with Qing Chuan kir, and the mixture proportion of Qing Chuan kir in composite modified asphalt (interior volume) is 7%.
Composite modified asphalt technical indicator should meet the requirement that table 2 specifies, material grading limit is as table 3, and the technical requirements of close water type composite modified hard grades of bitumen glue sand is as table 4.
The composite modified hard grades of bitumen technical indicator of table 2
Table 3 close water type hard grades of bitumen sand grading limit
The technical requirements of table 4 close water type hard grades of bitumen sand compound
4) spread first floor modified emulsifying asphalt adhesion coating 4: spread quantity is 0.3 ~ 0.6L/m
2, strengthen bituminous mixture interlaminar bonding, its performance meets " standard specification for construction and acceptance of highway asphalt pavement " 4.7 requirements.
5) the anti-shearing layer 3:SMA-13 of 6cm, adopt SBS modified bitumen to make cementitious matter, nominal maximum particle diameter is the interruption compact compound of 13.2mm; Or WHMAC0/10, adopts composite modified hard grades of bitumen to be cementitious matter, nominal maximum particle diameter is continuous type close-graded, the suspension-compact structure compound of 9.5mm.Its grating of SMA-13 compound and technical requirements should meet " standard specification for construction and acceptance of highway asphalt pavement ".The grating of WHMAC0/10 compound and technical requirements should meet table 5,6.
Table 5 WHMAC0/10 grading limit
Table 6 WHMAC0/10 technical requirements
6) spread second layer modified emulsifying asphalt adhesion coating 2: spread quantity is 0.3 ~ 0.6L/m
2,strengthen bituminous mixture interlaminar bonding, its performance meets " standard specification for construction and acceptance of highway asphalt pavement " 4.7 requirements.
7) 4cm abrasion resisting layer 1:SMA-10, makees cementitious matter with SBS modified bitumen, and nominal maximum particle diameter is the interruption compact compound of 9.5mm; Its grating and technical requirements should meet " standard specification for construction and acceptance of highway asphalt pavement ".Abrasion resisting layer 1 end face arranges the transverse slope of 2%.
8) lateral drainage french drain 8: adopt the edge drainage that vertically sluices, side direction simple grain footpath premixed macadam weeper drain width is 15cm, above the degree of depth to Multifunctional layered 5, fills ballast grain sizes 10-20mm, and rubble is through weight ratio 2.5% mulseal premixing; Do baffle plate when pave-load layer is constructed with the plank of wide 20cm, thick 6cm or 8cm, reserve the groove of rubble french drain, before abrasion resisting layer 1 is constructed, carry out that rubble fills, compacting, and spread modified emulsifying asphalt.
Weeper drain medium stone material grating is: between 25mm-19mm, pellet weight ratio accounts for 0-10%; 9.5mm-12.5mm between pellet ratio account for 35%-80%; Between 4.75mm-9.5mm, pellet weight ratio accounts for 10%-55%; Below 4.75mm pellet weight ratio accounts for 0-10%.Transmission coefficient is not less than 400ml/min.
Claims (6)
1. one kind can be applicable to the cement concrete bridge deck paving structure of extreme environment for use, it is characterized in that: after dabbing or Shot Blasting are carried out to cement concrete bridge deck plate, water-proof system, Multifunctional layered, anti-shearing layer and abrasion resisting layer is set gradually from bottom to top above cement concrete bridge deck plate, between Multifunctional layered and anti-shearing layer and between anti-shearing layer and abrasion resisting layer, be provided with modified emulsifying asphalt adhesion coating, side direction simple grain footpath premixed macadam weeper drain be set at bridge floor avris and directly let out formula drain hole;
Described water-proof system comprises water-proof tack coat, and described water-proof tack coat adopts hot SBS modified bitumen or hot rubber powder modified asphalt, and hot SBS modified bitumen is according to 1.2 ~ 1.5kg/m
2scope carries out spread, and hot rubber powder modified asphalt is by 1.5 ~ 1.8kg/m
2scope carries out spread, after spread, and spreading one deck pitch premixed macadam on water-proof tack coat, ballast grain sizes 3 ~ 8mm, through weight ratio 3 ~ 5 ‰ pitch premixing;
Described Multifunctional layered adopts close water type composite modified hard grades of bitumen glue sand, described close water type composite modified hard grades of bitumen glue sand using matrix pitch, SBS modifier and natural ganoine bitumen according to a certain percentage, the composite modified hard grades of bitumen that processes of order blending, swelling growth, high speed shear as binder, the storage stability according to test determines suitable stabilizer types and volume;
Described anti-shearing layer adopts composite modified hard grades of bitumen to make cementitious matter, and nominal maximum particle diameter is the interruption compact compound of 13.2mm; Or adopting composite modified hard grades of bitumen to be cementitious matter, nominal maximum particle diameter is continuous type close-graded, the suspension-compact structure compound of 9.5mm;
Described abrasion resisting layer adopts SBS modified bitumen to make cementitious matter, and nominal maximum particle diameter is the interruption compact compound of 9.5mm;
The spread quantity of described modified emulsifying asphalt adhesion coating is 0.3 ~ 0.6L/m
2;
The width of described side direction simple grain footpath premixed macadam weeper drain is 10-20cm, above the degree of depth to Multifunctional layered, fills ballast grain sizes 10-20mm, and rubble is through weight ratio 2.5 ± 0.3% mulseal premixing.
2. the cement concrete bridge deck paving structure that can be applicable to extreme environment for use according to claim 1, is characterized in that, after cement concrete bridge deck plate carries out dabbing or Shot Blasting, its roughness is 0.4 ~ 1.2mm.
3. the cement concrete bridge deck paving structure that can be applicable to extreme environment for use according to claim 1, is characterized in that, the grading limit of the close water type of Multifunctional layered composite modified hard grades of bitumen glue sand:
9.5mm percent of pass is 100%; 4.75mm percent of pass is 85 ~ 100%; 2.36mm percent of pass is 60 ~ 85%; 1.18mm percent of pass is 38 ~ 68%; 0.6mm percent of pass is 22 ~ 54%; 0.3mm percent of pass is 14 ~ 32%; 0.15mm percent of pass is 10 ~ 22%; 0.075mm percent of pass is 7 ~ 12%.
4. the cement concrete bridge deck paving structure that can be applicable to extreme environment for use according to claim 1, it is characterized in that, in the binder of the close water type of Multifunctional layered composite modified hard grades of bitumen glue sand, matrix pitch and SBS modifier are mixed to join according to the weight ratio of 95% ~ 96%:4% ~ 5% and are formed SBS modified bitumen, and the mixture proportion of SBS modified bitumen and natural ganoine bitumen is determined in conjunction with the type of natural ganoine bitumen and content of ashes.
5. the cement concrete bridge deck paving structure that can be applicable to extreme environment for use according to claim 1, is characterized in that, the grating of weeper drain medium stone material is: between 25mm-19mm, pellet weight ratio accounts for 0-10%; 9.5mm-12.5mm between pellet ratio account for 35%-80%; Between 4.75mm-9.5mm, pellet weight ratio accounts for 10%-55%; Below 4.75mm pellet weight ratio accounts for 0-10%;
Transmission coefficient is not less than 400ml/min.
6. the cement concrete bridge deck paving structure that can be applicable to extreme environment for use according to claim 1, is characterized in that, abrasion resisting layer end face is provided with the transverse slope of 2%.
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| CN115369712A (en) * | 2018-02-09 | 2022-11-22 | 南昌工程学院 | Highway large and medium-sized bridge deck asphalt pavement structure |
| CN109577183A (en) * | 2018-12-17 | 2019-04-05 | 山东汇通建设集团有限公司 | The anti-ponding structure in overhead bridge floor edge and construction |
| CN110172909A (en) * | 2019-06-25 | 2019-08-27 | 山东省路桥集团有限公司 | Cement concrete bridge deck bilayer AC Asphalt mixture pavement structure and method for paving |
| CN113652962A (en) * | 2021-08-25 | 2021-11-16 | 中国石油天然气股份有限公司 | Noise-reducing and ice and snow-resisting bridge deck pavement composite layer and pavement method thereof |
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