CN102864758B - Construction method of rolling compaction type asphalt concrete impervious core wall in high altitude and cold areas - Google Patents
Construction method of rolling compaction type asphalt concrete impervious core wall in high altitude and cold areas Download PDFInfo
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- CN102864758B CN102864758B CN201210401770.8A CN201210401770A CN102864758B CN 102864758 B CN102864758 B CN 102864758B CN 201210401770 A CN201210401770 A CN 201210401770A CN 102864758 B CN102864758 B CN 102864758B
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Abstract
The invention discloses a construction method of a rolling compaction type asphalt concrete impervious core wall in high altitude and cold areas. The construction method comprises the following steps of performing preparation for construction; processing ore materials, processing asphalt concrete aggregate through a two-section crushing and primary sand making process, and grading the finished aggregate; and designing the mix proportion of asphalt and concrete, preparing asphalt mixture, building the asphalt concrete impervious core wall and detecting quality of the asphalt concrete impervious core wall. Compared with the prior art, the construction method ensures construction quality and quickens construction speed in the projects of stone dam filling in the high altitude and cold areas and the areas with deep covers. Therefore, stone dams can come into service as soon as possible.
Description
Technical field
The present invention relates to a kind of construction method, be specifically related to a kind of construction method of watertight core.
Background technology
Watertight core is as the important component part of earth and rockfill dam, and in work progress, as priority control position, the material that is used as watertight core generally comprises the materials such as clay, gravelly soil, steel concrete and bituminous concrete.In recent years, the adaptive deformation performance that asphalt-concrete core wall is simple in structure with it, engineering quantity is little, speed of application is fast, barrier performance is reliable and good, is applied in earth-rock works more and more.But guaranteeing to have become technical barrier urgently to be resolved hurrily aspect construction quality and accelerating construction progress at high and cold high height above sea level and deep covering layer area.
Summary of the invention
Given this, the object of the invention is to provide a kind of construction quality of watertight core and construction method of progress of guaranteeing in high and cold high height above sea level and deep covering layer area.
For solving above technical problem, technical scheme provided by the invention is, a kind of high and cold high altitude localities compaction type asphalt-concrete core wall construction method is provided, and its construction sequence is as follows:
1) preparation of construction;
2) mineral aggregate processing, the processing of bituminous concrete aggregate adopts two sections of fragmentations, one-level technology for making sand, and finished aggregate is divided into: coarse aggregate comprises great Shi, and diameter is 10～20mm; Middle stone, diameter is 5～10mm; Gravelstone, diameter 2.5～5mm; Fines: sand, particle diameter is 0.075～2.5mm, filler claims again breeze particle diameter to be less than 0.075mm;
3) design mixture ratio of asphalt concrete, the weight ratio of pitch and building stones is not less than 6.8: 100;
4) bituminous mixture preparation,
Bottled asphalt is stored up height lower than 1.8m; It is fuel that asphalt barrel removing, dehydration and maintenance constant temperature adopt diesel oil, and the mode that combustion furnace heating and the conduction oil of take are heat medium heats, and pitch dewatering temperature is controlled at 110～130 ℃, and moisture gasification is overflowed; After asphalt melting, dehydration, continue to be heated to 150～170 ℃, the heat time is less than 6 hours; After asphalt heating, be delivered to thermostatic tank and store, temperature is controlled at 150～170 ℃, is no more than 24 hours memory time; Pitch adopts double-skin duct to carry from thermostatic tank to batching plant, admittance deep fat between the inner tube of double-skin duct and outer tube;
The aggregate of finished product bin is standby through sealing-tape machine, and cold aggregate evenly enters the heating of dry heat cylinder continuously, and heating and temperature control is 170～190 ℃; Through the combined aggregate of dry heat, through regrading; Heat material, through sieve classification, is stored in hot hopper by grain size, for batching;
During mixing bituminous mixture, first throw aggregate and breeze dry mixing 15～25s, then spray pitch wet-mixing 45～60s; Drop temperature is controlled at 160 ℃;
Bituminous mixture adopts heat insulated tank to store; Asphalt mixture thermal-insulating reduces and is no more than 1 ℃ by every 4 hours temperature in 24 hours, and bituminous mixture storage tank adopts Electric heating heating, and storage tank insulation adopts layer of mineral wool insulation;
1) asphalt-concrete core wall making
A) pedestal is processed
Asphaltic concrete core wall pedestal is mainly taked dabbing, is sprayed cut back bitumen and smear asphalt mortar, bituminous mortar and process; Dabbing is removed base-plates surface clean; Base-plates surface spraying cut back bitumen ratio is pitch: gasoline=3: 7～4: 6; Organic oil volatilization in cut back bitumen, surface is dry smears asphalt mortar, bituminous mortar after not touching with one's hand, and the normal smearing thickness of asphalt mortar, bituminous mortar is 1cm, and controlling construction temperature is 160 ℃;
B) bituminous mixture transportation
C) bituminous mixture laying
1. set up template
2. paving is filled out Transition Materials
3. the making of bituminous mixture
Asphaltic concrete core wall adopts horizontal slice, and it is 20～30cm that layer thickness is controlled, and takes the construction method of a decking and rolling of not segmentation of holoaxial line; Asphaltic concrete core wall and Transition Materials, dam shell material fill synchronizes rising, balanced construction as far as possible; The discrepancy in elevation of core-wall and transition zone and dam shell material is not more than 80cm;
Continuously during the above bituminous concrete of 2 layers of makings, lower floor's bituminous concrete surface temperature should drop to 100 ℃ of upper strata bituminous mixtures that pave below;
D) bituminous mixture rolls
First roll core-wall, then roll Transition Materials; According to different core-wall width adopt that the bilateral junction of the edges of two sheets of paper rolls, the monolateral junction of the edges of two sheets of paper rolls and pastes seam and roll, the overlapping width that rolls is not less than 15cm; The Ying Xianwu that rolls of bituminous mixture shakes and rolls, then has to shake and roll; Rolling speed should be controlled at 20m/min～30m/min;
When bituminous mixture rolls, strict control rolled temperature, just grinds temperature and is controlled at 140 ℃～145 ℃, grinds eventually temperature and is not less than 110 ℃;
E) seam and aspect are processed
1. asphaltic concrete core wall transverse joint is processed
Asphaltic concrete core wall guarantees balanced rising completely as far as possible, guarantees same elevation construction, reduces transverse joint; In the time must there is transverse joint, it makes the slope of being delayed in 1: 3 in conjunction with the gradient, more than levels shift of butts 2m; During seam construction, first reject surperficial coarse granule aggregate, first with gasoline compacting slope to bituminous concrete surface, return oil, then roll and make bituminous mixture closely knit at transverse joint place with vibrating roller; Before next bituminous mixture laying, manually with drill rod, cut the bituminous concrete of slope sharp corner, remove the dirt on bituminous concrete surface, on surface, smear again one deck asphalt mortar, bituminous mortar, during bituminous mixture laying, use infrared heater zone of heating surface temperature to reach more than 70 ℃, then carry out bituminous mixture laying, roll;
2. aspect is processed
On the core-wall of compacting, continue, before making, in connection with face, to clean out; Asphaltic concrete core wall layer temperature is controlled at 70 ℃～100 ℃;
Asphaltic concrete core wall first and second phase joint is processed and is adopted key-wall pattern to process and the processing of enlarged footing pattern;
1) detect asphaltic concrete core wall quality.
Preferably, the ratio of described pitch and building stones is 7.1%.
Compared with prior art, construction method of the present invention has solved at high and cold high height above sea level and deep covering layer area and has filled in the engineering of masonry dam, when guaranteeing construction quality, has also accelerated construction speed.Masonry dam can be put into effect early.
Accompanying drawing explanation
Fig. 1 is compaction type asphalt concrete seepage prevention wall construction flow chart.
Fig. 2 is mineral aggregate flow process chart.
Fig. 3 is bituminous mixture preparation technology flow chart.
Fig. 4 is asphaltic concrete core wall making process chart.
Fig. 5 is artificial making process chart.
Fig. 6 is mechanized paving process chart.
Fig. 7 is first and second phase asphaltic concrete core wall joint key-wall pattern.
Fig. 8 is first and second phase asphaltic concrete core wall joint enlarged footing pattern.
The specific embodiment
Below in conjunction with accompanying drawing and specific embodiment, describe.
The construction process that the present embodiment is described comprises the flow processs such as preparation of construction, mineral aggregate processing, bituminous mixture preparation, asphaltic concrete core wall making, asphaltic concrete core wall quality examination, and construction main-process stream as shown in Figure 1.Mineral aggregate work flow as shown in Figure 2.
Bituminous concrete raw material mainly comprise pitch and mineral aggregate, pitch is general use the same brand of same producer hydraulic asphalt, general with No. 70 pitches of water conservancy project, when dispatching from the factory, every batch of pitch have product certificate and quality restriction report, in transportation packing not damaged, do not weather and pollute, not because of overheated occur aging, bituminous pitch storing should store according to lot number in batches, prevents from mixing.Mineral aggregate mainly comprises coarse-fine aggregate and filler, the quality of mineral aggregate should meet design and code requirement, grating is good, the graduation curve of the composition of each component should meet the graduation curve requirement that test proposes, through site operation practice, the super inferior footpath of aggregate can not controlled as leading indicator, but the maximum one-level of coarse aggregate must not have oversize, in work progress, answer per tour to detect grading of aggregate, according to characteristic curve of aggregate, in time match ratio is adjusted.
Bituminous concrete generally adopts alkali aggregate to process with aggregate, is generally limestone, marble etc. containing CaCO
3the rock of composition, requires its basicity modulus to be greater than 1, CaCO
3content is more than 95%.Piece stone stores the awning of setting up defences.
General two sections of fragmentations, the one-level technology for making sand of adopting of bituminous concrete aggregate processing, general finished aggregate is divided into coarse aggregate, fines and filler.Coarse aggregate comprises: great Shi, and diameter is 10～20mm; Middle stone, diameter is 5～10mm; Gravelstone, diameter is 2.5～5mm.Fines is sand, and particle diameter is 0.075～2.5mm.Filler, claims again breeze, and particle diameter is less than 0.075mm.Detection, rejecting to non magnetic weak magnetic metal object in manufacturing process.
Bituminous mixture preparation technology flow process as shown in Figure 3.The composite type technological process that the preparation of bituminous mixture adopts continuous drying, intermittent dosing and mixes and stirs.Mainly comprise bituminous pitch storing, fusing, dehydration, heating, constant temperature and conveying, aggregate is slightly joined and dry heat, the mixing of bituminous mixture, the links such as the storage of bituminous mixture and insulation.
1. bituminous pitch storing, fusing, dehydration, heating, constant temperature
Bituminous pitch storing quantity meets site operation needs, bottled asphalt is stored up height in 1.8m after being transported to building-site, and there are enough passages for transportation and fire-fighting emergency, the pitch of different lot numbers is stored up respectively and is prevented from mixing, asphalt barrel can not sun direct projection, especially prevents from that ultraviolet ray from irradiating to cause ageing of asphalt in high altitude localities.
It is fuel that asphalt barrel removing, dehydration and constant temperature adopt diesel oil, the mode of heating that combustion furnace heating and conduction oil are heat medium, and pitch dewatering temperature is controlled at 110～130 ℃, by getting blisters and dewatering, moisture gasification is overflowed, and prevents from that heated bitumen is excessive to boil.Asphalt melting, dehydration half an hour after, continue to be heated to 150～170 ℃, low temperature season is got higher temperature value, the heat time was controlled in 6 hours.Pitch thermostat temperature is controlled at 150～170 ℃, strict upper control limit temperature.Asphalt heating is delivered to thermostatic tank storage use to set point of temperature, and constant temperature time is no more than 24 hours, in case ageing of asphalt.Pitch adopts double-skin duct to carry from thermostatic tank to batching plant, admittance deep fat between the inner tube of double-skin duct and outer tube, avoids pitch frozen plug pipeline in course of conveying.
2. aggregate is just joined and dry heat
The aggregate of finished product bin is standby through sealing-tape machine or other equipment batch bins at different levels, and cold aggregate evenly enters the heating of dry heat cylinder continuously, and heating and temperature control is 170～190 ℃.Combined aggregate through dry heat, is promoted to batching plant jacking row regrading with hot elevator.Heat material, through sieve classification, is stored in hot hopper by grain size, for batching.
3. the mixing of bituminous mixture
Bituminous mixture adopts mixing ratio by weight, and mineral aggregate be take dry state as standard, and mineral aggregate and pitch is stage metering and metering separately respectively, and batching is prepared burden in strict accordance with the bituminous concrete charger sheet of supervising engineer's approval.All weighing equipments are all calibrated before use, are tested, and regularly give verification, to guarantee weighing precision.
Before the formal production of bituminous mixture, must mix and stir the various devices of system to compound and detect, mainly detect the operating condition of precision, timing, temperature measuring equipment and other control device of Weighing system.During mixing bituminous mixture, first throw aggregate and breeze dry mixing 15～25s, then spray pitch wet-mixing 45～60s, the concrete mixing time is determined by test.The bituminous mixture of mixing out guarantee color and luster even, rare thick consistent, without grey material, tobacco and other anomalies, do not produce segregation during discharging, outlet temperature should be controlled at 160 ℃, specifically to meet bituminous concrete, paves and rolls temperature requirement and be as the criterion.
4. bituminous mixture stores and insulation
Bituminous mixture adopts heat insulated tank to store.Asphalt mixture thermal-insulating reduces and is no more than 1 ℃ by every 4 hours temperature in 24 hours, and bituminous mixture storage tank adopts Electric heating heating, and storage tank insulation adopts layer of mineral wool insulation.
Asphaltic concrete core wall making technique comprises artificial making technique and the machinery section of paving making technique, and asphaltic concrete core wall making process chart as shown in Figure 4.Artificial making process chart as shown in Figure 5.The machinery section of paving making process chart as shown in Figure 6.Asphaltic concrete core wall pedestal is mainly taked dabbing, is sprayed cut back bitumen and smear asphalt mortar, bituminous mortar and process.Dabbing is removed base-plates surface concrete discrete particles clean, and the complete liquidations such as its surperficial laitance, newborn skin, waste residue and adhesion dirt is clean, guarantees concrete surface clean and dry; Base-plates surface spraying cut back bitumen has a great impact the bonding tool of bituminous concrete and cement concrete.General cut back bitumen ratio is pitch: gasoline=3: 7 or 4: 6, job site adopts sprayer spraying, cut back bitumen coating layer thickness evenly, dry after color be that somber is best spraying effect.During cut back bitumen preparation, carry out in spacious place, note security against fire; The Main Function of asphalt mortar, bituminous mortar is the bond effect improving between bituminous concrete and cement concrete pedestal, makes bituminous concrete and cement concrete pedestal form closely knit, a complete seepage prevention system.In cut back bitumen, organic oil is all volatilized, surface is dry can smear asphalt mortar, bituminous mortar after not touching with one's hand, and asphalt mortar, bituminous mortar is constructed according to test and through the match ratio of approval, and smearing thickness is 1cm conventionally, and controlling construction temperature is 160 ℃.
Bituminous mixture transportation adopts transports through refrigerator wagon and loader.
Manual is used homemade punching block, the punching block manually setting up firmly, splicing is tight, size is accurate, convenient disassembly, be less than ± the 5mm of deviation of the center line centroid wall design centre line behind punching block location, before bituminous mixture rolls, first punching block extracted and in time surface adhesion thing removed clean; Machinery paves and adopts the punching block carrying, and the size that will often correct punching block in construction, to guarantee that the width of core-wall meets design requirement.
Transition Materials paving is filled out: the Transition Materials of Manual section adopts digging machine to carry out, and be aided with manually and coordinate, before filling, should be surperficial with covering core-walls such as waterproof cloth.More than covering width should exceed two side template 30cm; The machinery section of paving, paving width and the thickness of Transition Materials are regulated automatically by paver, and the position that paver cannot pave should adopt artificial other construction machineries that coordinate to mend paving Transition Materials.
The making of bituminous mixture: asphaltic concrete core wall adopts horizontal slice, it is 20～30cm that layer thickness is controlled, and takes the construction method of a decking and rolling of not segmentation of holoaxial line.Asphaltic concrete core wall and Transition Materials, dam shell material fill synchronizes rising as far as possible, and balanced construction, to guarantee compaction quality.The discrepancy in elevation of core-wall and transition zone and dam shell material is not more than 80cm.
Manual, before each making, should be according to relevant parameters such as the structural requirement of asphaltic concrete core wall and transition zone and construction requirement adjustment making width, thickness; When machinery paves, should often detect and proofread and correct the control system of paver, the speed that paves is with 1m/min～3m/min, and the position that machinery is difficult to making is aided with Manual.
Continuously during the above bituminous concrete of 2 layers of makings, lower floor's bituminous concrete surface temperature should drop to 100 ℃ of following upper strata bituminous mixtures that can pave.The placement temperature of bituminous mixture should determine by test, and should control is 140 ℃～170 ℃.
Bituminous mixture rolls employing vibrating roller, by the design width of the different elevations of asphaltic concrete core wall, adopts respectively the special-purpose rolling apparatus of core-wall and the different modes of rolling of different model to roll.For guaranteeing core-wall width, should employing first roll core-wall, then roll Transition Materials.According to different core-wall width adopt that the bilateral junction of the edges of two sheets of paper rolls, the monolateral junction of the edges of two sheets of paper rolls and pastes seam and roll.When vibrating roller muller width is less than the appropriate to the occasion employing of asphaltic concrete core wall width, pastes seam and roll, and should adopt vibrating roller that muller width is larger with minimizing overlapping part.When being greater than the monolateral junction of the edges of two sheets of paper of the appropriate to the occasion employing of asphaltic concrete core wall width, vibrating roller muller width rolls.The overlapping width that rolls is not less than 15cm.Adopt the bilateral junction of the edges of two sheets of paper to roll as avoiding polluting storehouse face, with rolling again after canvas covering bituminous mixture.
The Ying Xianwu that rolls of bituminous mixture shakes and rolls, then has to shake and roll; Rolling speed should be controlled at 20m/min～30m/min; The two sections of overlapping 30cm～50cm that roll in junction in front and back.While rolling, vibrating roller must not be brought to a halt or be driven a vehicle across core-wall.In roller compaction construction process, diesel oil or other oil mixing with water material things should be sprayed directly in aspect, should remove by the bituminous mixture of oil material contamination.Various machinery must not cause disturbance to asphalt-concrete core wall, will be through carefully proving while directly crossing over core-wall.Within the scope of the 2m of core-wall both sides, must not use big machinery operation more than 10t.
When bituminous mixture rolls, strict control rolled temperature, just grinds temperature and should be controlled at 140 ℃～145 ℃, and grinding temperature eventually should not be lower than 110 ℃.The whole process of rolling should be accomplished not glue stone roller, fall into not ground, do not ftracture in bituminous concrete surface.
When bitumen content is larger, can adopt drop cloth to roll, to prevent that bituminous concrete is sticky, grind.After having rolled, in time canvas is taken off, the asphaltic concrete core wall being conducive to after rolling is got rid of bubble.
Asphaltic concrete core wall transverse joint is processed: asphaltic concrete core wall guarantees balanced rising completely as far as possible, guarantees same elevation construction, reduces transverse joint.In the time must there is transverse joint, it makes the slope of being delayed in 1: 3 in conjunction with the gradient, more than levels shift of butts 2m.During seam construction, use the artificial surperficial coarse granule aggregate of rejecting, first with gasoline compacting slope to bituminous concrete surface, return oil, then roll and make bituminous mixture closely knit at transverse joint place with vibrating roller.Before next bituminous mixture laying, manually with drill rod, cut the bituminous concrete of slope sharp corner, and wire brush is removed and is sticked to the dirt on bituminous concrete surface and blow off with high-pressure blast, on surface, smear again one deck asphalt mortar, bituminous mortar, during bituminous mixture laying, use infrared heater zone of heating surface temperature to reach more than 70 ℃, then carry out bituminous mixture laying, roll.
Aspect is processed: on the core-wall of compacting, continue before making, should clean out in connection with face.Pollution face adopts compressed air spraying to remove.As winding-up can not be removed completely, application infrared element baking pollution face, removes its softening rear shovel.When asphaltic concrete core wall layer temperature is during lower than 70 ℃, adopt infrared element to be heated to 70 ℃～100 ℃.During heating, control the heat time in case bituminous concrete is aging.
When bituminous concrete surface idle hours is longer, take covering protection measure.In connection with face, clean out, and aspect be dried, be heated to 70 ℃ when above, can making bituminous concrete, if desired should be separately in aspect even spraying one deck cut back bitumen, after pitch to be diluted is dry, repaves and build upper strata bituminous mixture.
The hole staying after asphaltic concrete core wall boring and coring backfill in time, should be first that boring purge is clean during backfill, dry hole internal water accumulation, with tubular type infrared heater, hole wall is dried and is made bituminous concrete surface temperature to reach more than 70 ℃, reusable heat bituminous mixture is pressed the back-filling in layers of 5cm one deck, manually uses tamper tamping.
Bitumen Concrete Mixture Ratio Design: the mix-design employing mineral aggregate gradation of hydraulic asphalt concrete and asphalt content are as two major parameters of mix-design, wherein three parameter (D for mineral aggregate gradation
max, d
i, P
i) characterize each particle diameter d of aggregate
ipercent of pass P
iall have a particular range, the percent of pass design formulas of each grade mineral aggregate is as follows:
In formula: P
i-particle diameter is total percent of pass of di;
D
max-maximum aggregate size;
P
0.074total percent of pass on-0.074mm sieve.
Each grade mineral aggregate by scope, be to determine according to the mineral aggregate gradation feature of compaction type hydraulic asphalt concrete, therefore, this design theory has stronger pardon, can adapt to preferably different grading of aggregate.
High altitude localities Bitumen Concrete Mixture Ratio Design: high altitude localities is generally located at high earthquake intensity area, for example the earthquake intensity of the other many key water control projects in Tibet is VIII degree, possesses dark covering layer feature simultaneously, add intense radiation climatic influences, bituminous concrete design of concrete will fully take into account and adapt to large deformation, aging-resistant impact, and bitumen content is compared other regional engineerings and will suitably be improved.The pitch of high altitude localities dam compaction type asphaltic concrete core wall and the weight ratio of building stones are not less than 6.8: 100, preferably 7.1: 100.
Determining of construction match ratio: compaction type asphaltic concrete core wall construction parameter is determined through interior ingredient ratio, site operation simulated test and produced on-site test.By laboratory test, recommend the match ratio for site operation simulated test, site operation simulated test is generally simulated normal construction sequence according to site operation situation and is carried out, the length of test section is generally 30～50m, pedestal concrete carries out according to the concrete size of actual base and concrete grade, by simulated test, determines site operation match ratio, construction parameter and temperature control parameter.Produced on-site test is carried out on dam asphaltic concrete core wall pedestal, by Manual and machinery, paves and carries out respectively, determines the construction parameter that core-wall is final.
Asphaltic concrete core wall first and second phase joint is processed: for accelerating site operation progress, bring into play in advance project benefit, core-wall can be divided into first phase and the second phase constructs, and brings thus the problem that same period, did not manage joint.The quality that joint is processed has directly determined the anti-seepage effect of core-wall, because the intense radiation of high altitude localities impact, can cause the aging of pitch core-wall surface, core wall construction intermittent phase first and second phase is longer, after the completion of first phase core-wall, to cover core-wall surface, general employing canvas covering surfaces, then the way of earthing is protected on canvas, the sand gravel thickness that covers is not less than 1m.Joint must increase seepage paths length, and joint geometry comprises key-wall pattern and enlarged footing pattern, and key-wall pattern is referring to Fig. 7, and in fist stage concrete core-wall a and second stage concrete core-wall b joint, the second stage concrete core-wall the top of a wall is protected the top of a wall of fist stage concrete core-wall completely.Enlarged footing pattern is referring to Fig. 8, and the joint of the joint of fist stage concrete core-wall a ' and second stage concrete core-wall b ' is symmetrical with respect to contact face structure, and the thickness of contact surface is greater than the thickness of concrete core-wall.The first phase core-wall surface aging degree of depth will be first determined in joint construction, then by loose the knocking out with aging layer of first phase joint surface, on surface, smear one deck asphalt mortar, bituminous mortar, second phase core-wall joint is constructed according to the joint geometry of design, in second phase joint work progress, to strengthen the baking to first phase joint, to increase the bonding of first and second phase core-wall.
Asphaltic concrete core wall protection: the main protection of surviving the winter to the protection of high altitude localities strong ultraviolet radiation and asphaltic concrete core wall of asphaltic concrete core wall protection, adopts the method for canvas cover sand gravel that ultraviolet ray is irradiated and protected to first and second phase core-wall joint; Core-wall in construction, the method that adopts canvas to cover is protected core-wall.The general construction period of earth and rockfill dam is longer, and this just need to carry out the protection of surviving the winter to core-wall.In high and cold high altitude localities, day and night temperature is larger, is unfavorable for that core-wall is closely knit by self adjusting after rolling, suspension of works in the winter time, and cold snap easily causes external crack.Means of defence is at core-wall surface cover one deck canvas, cover sand gravel on canvas then, and sand gravel thickness is greater than the thickness of local frozen soil layer.
Described in the present embodiment, the main construction equipment of construction method is in Table 1.
The main construction equipment table of table 1 bituminous concrete:
Engineering Quality Control standard
Compaction type asphalt-concrete core wall construction quality is carried out according to < < water conservancy project Construction of roller compacted asphalt concrete standard > > (DL/T5363-2006) and designing requirement.Generally from aspects such as raw-material check and control, the check of bituminous mixture preparation quality and the check of control and asphalt concrete construction quality and controls, carry out.
Raw-material check and control
(1) composition material of bituminous concrete is comprised to the quality of pitch, aggregate, filler etc. should strictly control, accomplishing to dispatch from the factory, (field) controlled, admission detects qualified rear examination.
(2) bituminous concrete raw material quality standard and test item and detection frequency are undertaken by table 2.
Table 2 bituminous concrete raw material test item and detection frequency
(3) pitch is transported to building site, should stack storehouse extraction asphalt sample at pitch and carry out quality restriction.Pitch detects index, and any one does not meet the requirement of 7.1-1, is defective work.The pitch of having accepted by check, no matter when the pitch at any time using marching into the arena carries out sampling Detection, if find, its index and technical requirements do not meet, this pitch is defective work.
(4) aggregate processing plant should set up check system according to production process, by all technical sampling inspection of this standard regulation, material quality check achievement qualified or meet design requirement after can use.
(5) breeze process answers strengthening process to control.Filler should be by the examination of testing of all technical of this standard regulation, if density, moisture content, hydrophilic coefficient index can not all reach requirement, can not use.
(6) bituminous mixture various modifier used, should with test with design determined material property and conform to, and check and accept by the quality requirement of relevant industrial target level of product quality and design, every crowd or every 3t～5t sample one group, can use after the assay was approved.
Below be only the preferred embodiment of the present invention, it should be pointed out that above-mentioned preferred embodiment should not be considered as limitation of the present invention, protection scope of the present invention should be as the criterion with claim limited range.For those skilled in the art, without departing from the spirit and scope of the present invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (2)
1. a high and cold high altitude localities compaction type asphalt-concrete core wall construction method, is characterized in that, its construction sequence is as follows:
Preparation of construction;
Mineral aggregate processing, the processing of bituminous concrete aggregate adopts two sections of fragmentations, one-level technology for making sand, and finished aggregate is divided into: coarse aggregate comprises great Shi, and diameter is 10～20mm; Middle stone, diameter is 5～10mm; Gravelstone, diameter 2.5～5mm; Fines: sand, particle diameter is 0.075～2.5mm, filler claims again breeze particle diameter to be less than 0.075mm;
Design mixture ratio of asphalt concrete, the weight ratio of pitch and building stones is not less than 6.8:100;
Bituminous mixture preparation,
Bottled asphalt is stored up height lower than 1.8m; It is fuel that asphalt barrel removing, dehydration and maintenance constant temperature adopt diesel oil, and the mode that combustion furnace heating and the conduction oil of take are heat medium heats, and pitch dewatering temperature is controlled at 110～130 ℃, and moisture gasification is overflowed; After asphalt melting, dehydration, continue to be heated to 150～170 ℃, the heat time is less than 6 hours; After asphalt heating, be delivered to thermostatic tank and store, temperature is controlled at 150～170 ℃, is no more than 24 hours memory time; Pitch adopts double-skin duct to carry from thermostatic tank to batching plant, admittance deep fat between the inner tube of double-skin duct and outer tube;
The aggregate of finished product bin is standby through sealing-tape machine, and cold aggregate evenly enters the heating of dry heat cylinder continuously, and heating and temperature control is 170～190 ℃; Through the combined aggregate of dry heat, through regrading; Heat material, through sieve classification, is stored in hot hopper by grain size, for batching;
During mixing bituminous mixture, first throw aggregate and breeze dry mixing 15～25s, then spray pitch wet-mixing 45～60s; Drop temperature is controlled at 160 ℃;
Bituminous mixture adopts heat insulated tank to store; Asphalt mixture thermal-insulating reduces and is no more than 1 ℃ by every 4 hours temperature in 24 hours, and bituminous mixture storage tank adopts Electric heating heating, and storage tank insulation adopts layer of mineral wool insulation;
Asphalt-concrete core wall making
A) pedestal is processed
Asphaltic concrete core wall pedestal is mainly taked dabbing, is sprayed cut back bitumen and smear asphalt mortar, bituminous mortar and process; Dabbing is removed base-plates surface clean; Base-plates surface spraying cut back bitumen ratio is pitch: gasoline=3:7 ~ 4:6; Organic oil volatilization in cut back bitumen, surface is dry smears asphalt mortar, bituminous mortar after not touching with one's hand, and the normal smearing thickness of asphalt mortar, bituminous mortar is 1cm, and controlling construction temperature is 160 ℃;
B) bituminous mixture transportation
C) bituminous mixture laying
1. set up template
2. paving is filled out Transition Materials
3. the making of bituminous mixture
Asphaltic concrete core wall adopts horizontal slice, and it is 20～30cm that layer thickness is controlled, and takes the construction method of a decking and rolling of not segmentation of holoaxial line; Asphaltic concrete core wall and Transition Materials, dam shell material fill synchronizes rising, balanced construction as far as possible; The discrepancy in elevation of core-wall and transition zone and dam shell material is not more than 80cm;
Continuously during the above bituminous concrete of 2 layers of makings, lower floor's bituminous concrete surface temperature should drop to 100 ℃ of upper strata bituminous mixtures that pave below;
D) bituminous mixture rolls
First roll core-wall, then roll Transition Materials; According to different core-wall width adopt that the bilateral junction of the edges of two sheets of paper rolls, the monolateral junction of the edges of two sheets of paper rolls and pastes seam and roll, the overlapping width that rolls is not less than 15cm; The Ying Xianwu that rolls of bituminous mixture shakes and rolls, then has to shake and roll; Rolling speed should be controlled at 20m/min～30m/min;
When bituminous mixture rolls, strict control rolled temperature, just grinds temperature and is controlled at 140 ℃～145 ℃, grinds eventually temperature and is not less than 110 ℃;
E) seam and aspect are processed
1. asphaltic concrete core wall transverse joint is processed
Asphaltic concrete core wall guarantees balanced rising completely as far as possible, guarantees same elevation construction, reduces transverse joint; In the time must there is transverse joint, it makes the slope of delaying in 1:3 in conjunction with the gradient, more than levels shift of butts 2m; During seam construction, first reject surperficial coarse granule aggregate, first with gasoline compacting slope to bituminous concrete surface, return oil, then roll and make bituminous mixture closely knit at transverse joint place with vibrating roller; Before next bituminous mixture laying, manually with drill rod, cut the bituminous concrete of slope sharp corner, remove the dirt on bituminous concrete surface, on surface, smear again one deck asphalt mortar, bituminous mortar, during bituminous mixture laying, use infrared heater zone of heating surface temperature to reach more than 70 ℃, then carry out bituminous mixture laying, roll;
2. aspect is processed
On the core-wall of compacting, continue, before making, in connection with face, to clean out; Asphaltic concrete core wall layer temperature is controlled at 70 ℃～100 ℃;
Asphaltic concrete core wall first and second phase joint is processed and is adopted key-wall pattern to process and the processing of enlarged footing pattern; After the completion of first phase core-wall, adopt canvas to cover core-wall surface, then earthing protects on canvas, thickness is not less than 1m; Joint must increase seepage paths length, and joint geometry comprises key-wall pattern or enlarged footing pattern; Key-wall pattern joint, in fist stage concrete core-wall a and second stage concrete core-wall b joint, the top of a wall of the completely coated fist stage concrete core-wall of the second stage concrete core-wall the top of a wall; Enlarged footing pattern joint, the joint of the joint of fist stage concrete core-wall a' and second stage concrete core-wall b' is symmetrical with respect to contact face structure, and the thickness of contact surface is greater than the thickness of concrete core-wall;
Detect asphaltic concrete core wall quality.
2. high and cold high altitude localities according to claim 1 compaction type asphalt-concrete core wall construction method, is characterized in that, the ratio of described pitch and building stones is 7.1%.
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| CN104018464B (en) * | 2014-02-18 | 2016-06-22 | 中国水利水电科学研究院 | Slide-pad type joint design between dam asphalt concrete seepage prevention body and base concrete |
| CN103835266B (en) * | 2014-03-17 | 2016-06-08 | 新疆额尔齐斯河流域开发工程建设管理局 | The bituminous concrete faying face construction method of clay core wall of earth dam |
| CN104314053A (en) * | 2014-10-09 | 2015-01-28 | 葛洲坝集团第二工程有限公司 | Earth and rockfill concrete core wall asphalt concrete and paving method thereof |
| CN105152580A (en) * | 2015-07-31 | 2015-12-16 | 中国水利水电第七工程局有限公司 | Hydraulic asphalt concrete antiseepage material with large particle size |
| CN107100050A (en) * | 2016-02-23 | 2017-08-29 | 新疆农业大学 | Rolled asphalt concrete combination aspect and the aspect of surviving the winter are rapidly heated construction method |
| CN107419706B (en) * | 2017-07-18 | 2019-09-24 | 中国水电基础局有限公司 | The mesoclimate of high altitude localities asphaltic concrete core wall construction builds method |
| CN107237236B (en) * | 2017-07-18 | 2019-08-20 | 中国水电基础局有限公司 | The energy-saving bituminous concrete preparation method of high altitude localities |
| CN107435319B (en) * | 2017-07-18 | 2019-08-23 | 中国水电基础局有限公司 | High altitude localities asphaltic concrete core wall rapid constructing method |
| CN107386060B (en) * | 2017-07-18 | 2019-06-25 | 中国水电基础局有限公司 | The blending method of high altitude localities bituminous concrete |
| CN107386212B (en) * | 2017-07-18 | 2019-08-20 | 中国水电基础局有限公司 | The method of high altitude localities asphalt concrete core dam construction |
| CN107675685A (en) * | 2017-11-01 | 2018-02-09 | 中国水利水电第七工程局有限公司 | Asphaltic concrete core wall pours roller compaction construction method in water retaining structure |
| CN111470806B (en) * | 2020-04-08 | 2022-04-19 | 新疆农业大学 | Large-particle-size aggregate core wall asphalt concrete and mixing proportion optimization method thereof |
| CN112854142A (en) * | 2021-01-15 | 2021-05-28 | 西安理工大学 | Rolling type asphalt concrete core wall construction method under complex climate condition |
| CN112945663B (en) * | 2021-01-27 | 2022-11-25 | 西安理工大学 | Method for detecting cohesiveness of hydraulic asphalt concrete and concrete base |
| CN116535138A (en) * | 2023-05-04 | 2023-08-04 | 广东水电二局股份有限公司 | Asphalt concrete and preparation method and application thereof |
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