CN112982175A - Pouring type asphalt concrete paving construction process - Google Patents
Pouring type asphalt concrete paving construction process Download PDFInfo
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- CN112982175A CN112982175A CN202110266142.2A CN202110266142A CN112982175A CN 112982175 A CN112982175 A CN 112982175A CN 202110266142 A CN202110266142 A CN 202110266142A CN 112982175 A CN112982175 A CN 112982175A
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Images
Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/18—Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/12—Grating or flooring for bridges; Fastening railway sleepers or tracks to bridges
- E01D19/125—Grating or flooring for bridges
Abstract
The invention discloses a pouring type asphalt concrete paving construction process, which comprises the following steps: 1) preparing a section, and performing raw material mix proportion design, resource inspection, transport vehicle preheating, bridge deck measurement and bridge deck cleaning; 2) a production section for producing a mixture and performing quality inspection; 3) a transport section; 4) a paving section, which comprises preparation before paving, paving of a mixture, penetration test and post-paving treatment; 5) and detecting the section, setting the seam, processing the boundary, and checking and accepting. The pouring asphalt concrete has the advantages of good seepage resistance, high construction speed, strong adaptive deformation capability, convenient and easy construction, weak dependence on environmental climate, small influence by the environmental climate, capability of being constructed even in winter, quick paving time and capability of reducing the interference to the surrounding environment.
Description
Technical Field
The invention relates to the technical field of steel box girder bridge deck construction, in particular to a pouring type asphalt concrete paving construction process.
Background
Modern clean production requires clean and wear-resistant floor of a workshop and low dust content in indoor air as much as possible, which not only improves the requirement of labor conditions, but also ensures the product quality. As an industrial floor coating, the epoxy resin coating has good wear resistance, dust resistance, chemical resistance and mechanical impact resistance, so that the existing road surface and bridge floor are mostly in a form of directly spreading epoxy resin.
The prior epoxy resin coating has the following problems of high raw material cost, long construction period, time and labor waste; 2. the dependence on the climate environment is strong during paving, and the construction efficiency is influenced; 3. when in paving, rolling is needed, which causes great noise pollution in the construction process and has great influence on the surrounding environment.
Disclosure of Invention
The invention aims to solve the problems and provides a pouring type asphalt concrete paving construction process which is low in cost, weak in dependence on environmental climate, small in influence of the environmental climate, free of rolling during paving, free of vibration, noise and pollution in the construction process and capable of reducing influence on surrounding buildings and underground ditch pipes.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a pouring type asphalt concrete paving construction process comprises the following steps:
1) preparation section
Performing raw material mixing ratio design, resource inspection, transport vehicle preheating, bridge deck measurement and bridge deck cleaning;
2) production section
Carrying out production of the mixture and carrying out quality inspection;
3) transport section
4) Paving section
The method comprises preparation before paving, paving of a mixture, penetration test and post-paving treatment;
5) detecting a segment
Setting and processing the boundary of the seam, and checking and accepting.
Further, the raw material mixing proportion design in the step 1 comprises the following steps:
a) selecting raw materials comprising aggregate, mineral powder, modified asphalt and additives;
b) detecting whether the performance of the raw materials meets the requirements, if so, reselecting the raw materials, and if so, executing the step c);
c) selecting mineral aggregate gradation, fitting coarse, medium and fine three-level gradation in a design gradation range, and performing initial oil and petrochemical processing by 7.7%;
d) carrying out a Liu-Eel fluidity test and a penetration test to determine the optimal gradation;
e) changing the oilstone ratio by +/-0.3 percent, carrying out five groups of different oilstone ratios, respectively carrying out a Liu-Er fluidity test and a penetration test, detecting whether the requirements are met, if not, adjusting the oilstone ratio to carry out the test again, and if so, executing the step f);
f) and (4) detecting whether the low-temperature performance meets the requirement, if not, adjusting the oilstone ratio to perform the test again, and if so, determining the final mixing ratio.
Further, the design control of the mix proportion comprises the following four aspects:
a. raw material selection
The performance of the modified asphalt reaches the design requirement and meets the actual requirement of the cast mixture; the aggregate performance meets the design, and the strength is not attenuated after the action at the high temperature of 300 ℃; the mineral powder is required to be pure, the impurity content does not exceed 5 percent, the passing rate of 0.075mm is required to be more than 80 percent, and the quality is stable;
b. target ratio and production ratio
The feeding speed of the cold storage bin is accurately calibrated, and the measured data is ensured to be consistent with the actual feeding quantity; the error is not more than 2%. The casting yield of the project is 60t/h, the total speed of cold material feeding is 80t/h, and when the hot material used for the design of the production mix proportion is sampled, the stirring station is set according to the parameters. And when the hot material is sampled, removing the bottom and the face material of the hot material bin, and taking the middle part as a sample. The grading used for the design of the production mix proportion is fitted according to the optimal grading of the target mix proportion;
c. mix proportion design verification
Setting a stirring station according to production parameters determined by target mixing ratio design and production mixing ratio design, producing at least 20t of mixture, continuously heating and stirring in a Cooker, and testing the performances of the pouring type asphalt mixture with different stirring time (40min, 2h, 4h and 6h) including fluidity and penetration;
d. matters of attention
Paying attention to the balance of evaluation indexes, the design principle of the project is as follows: on the premise of meeting the fluidity requirement of the mixture, the high-temperature stability is improved as much as possible. The test temperature is strictly controlled: heating the mineral aggregate to 240 ℃, asphalt to 185 ℃, and mixing the mineral aggregate with a mixer to 240 ℃. Strictly controlling the process parameters: and (4) dry-mixing the aggregate for 15s, adding the modified asphalt, stirring for 30s, adding the mineral powder, and continuously stirring for 30 min. And strictly unifying the performance test standards to obtain accurate test data.
Further, in the step 2), the cast asphalt concrete is produced by the following steps:
a) the mixing station is debugged normally, and the raw materials are detected to be qualified;
b) heating the broken stone and screening stone;
c) adding mineral powder, and mixing the mineral powder and stone according to the installation and production mix proportion;
d) dry mixing for 15 seconds;
e) adding asphalt and wet-mixing;
f) and (3) loading the raw materials into a Cooker, checking whether the pressure, the temperature and the state of the mixture of the raw materials are normal or not, if not, manually observing and processing the raw materials until the raw materials are qualified, then delivering the raw materials out of the factory, if the raw materials are unqualified, discarding the raw materials, and if the pressure, the temperature and the state of the mixture of the raw materials are normal, directly delivering the raw materials out of the factory.
Further, the heating temperature of the modified asphalt is as follows: 175-185 ℃, heating temperature of stone: 290 ℃ and 320 ℃, and the discharge temperature of the mixture is as follows: adding asphalt at 220-240 ℃, and wet-mixing for 90 s.
Further, in step 4), the paving section comprises:
a) preparation before paving: performing performance detection before the Cooker enters a working surface, wherein the appearance state of the mixture is normal, the temperature of the mixture is more than or equal to 220 ℃, and the construction workability is subject to proper paving; cleaning the bridge deck; the side baffle is placed according to a pre-planned paving scheme, so that the accuracy of the paving width is ensured, and if a bidirectional cross slope bridge floor is met, the bridge cannot be paved across a slope; the thickness of the paving baffle is set, a high-temperature non-deformable steel template is adopted, and the paving height is adjusted through the cushion blocks with different heights according to elevation measurement data.
b) Spreading the mixture: the Cooker is unloaded to the bridge deck, and the unloading speed is matched with the paving speed; the traveling speed of the paver: 1.5 m/min; measuring the thickness by an inserting and tamping method, and controlling the height between the ironing plate and the steel plate; spreading broken stones next to the mixture; spreading amount of broken stones: 4 to 7kg/m 2.
c) Penetration test: in the paving process, 3 vehicles are randomly selected from all transport vehicles for sampling, each vehicle is used for preparing a penetration test block, and the test blocks are cooled and brought back to a test room for penetration and penetration increment tests.
d) And (3) post-paving treatment: observing the bubble swelling position at any time, and puncturing bubbles caused by water vapor before the mixture loses fluidity; rolling the gravels with poor embedding effect by a roller; the temperature of the mixture is slightly reduced, and the paving template is removed when the mixture is basically formed
Further, in the step 5), the construction joints are arranged in a manner that construction joints are required to be arranged according to specific conditions of engineering during the construction of the cast asphalt concrete, longitudinal construction joints are arranged as much as possible, the longitudinal construction joints are respectively interfaces between lanes and between the lanes and the side bands, no transverse construction joint is arranged, and if special conditions are met and construction transverse joints are required to be arranged, the transverse joints are arranged at positions about 1/4 away from the top beam.
Further, in the step 5), the boundary processing mode is as follows, in order to facilitate the paving operation of the paver, an edge band with the width of 50-60 cm is left at the position close to the sidewalk for paving and leveling by manpower when the cast asphalt concrete is paved; the construction process of the edge band comprises the following steps: unloading the cast asphalt concrete into a sealed hopper car, manually conveying the cast asphalt concrete to an edge zone construction position, manually paving and leveling the cast asphalt concrete by using a leveling tool, and spreading asphalt pre-mixed broken stones; spreading amount of broken stones: 4-7 kg/m2, and rolling the gravels with poor embedding effect by using a roller.
The invention has the beneficial effects that:
1. compared with the traditional epoxy resin concrete paving mode, the construction period of the pouring type asphalt concrete construction method is shorter, a foundation is laid for realizing construction investment return in advance, and greater economic benefits are obtained: compared with the epoxy resin paving process, the bridge deck pouring type asphalt concrete paving construction has the advantages of low raw material cost and low labor and equipment cost.
2. The invention selects the construction mode of the pouring asphalt concrete, has good seepage-proofing property, high construction speed, strong adaptive deformation capability, convenient and easy construction, weaker dependence on environmental climate, small influence by the environmental climate, even can be constructed in winter, has quick paving time, can reduce the interference to the surrounding environment and reduces the construction cost.
3. The invention selects the construction mode of the pouring asphalt concrete, does not need rolling when spreading, has no vibration, no noise and no pollution in the construction process, and has little influence on surrounding buildings and underground ditch pipes.
4. The internal porosity of the cast asphalt concrete is close to zero, and the paved cast asphalt concrete structure layer has very good impermeability, so that moisture and other substances cannot permeate into the mixture, and the main structure of the bridge is effectively protected from corrosion; the excellent deformation performance can better adapt to the deformation of a bridge structure, the bonding strength and the anti-shearing performance of the spreading layer and the bridge deck plate are improved, the service life of the pavement is prolonged, the maintenance, repair and management costs are reduced, the total life cycle cost of the pavement is reduced, and the direct economic benefit can be generated.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a schematic view of the present invention;
FIG. 2 is a flow chart of raw material mix design according to the present invention;
FIG. 3 is a schematic diagram of a design control method for mix proportion according to the present invention;
FIG. 4 is a flow chart of the process of producing the cast asphalt concrete of the present invention;
FIG. 5 is a graph showing the relationship between the feeding speed of a single cold storage bin and the rotating speed of a motor.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, a pouring type asphalt concrete paving construction process includes the following steps:
1) preparing a section, calibrating a metering instrument and equipment, and performing raw material mix proportion design, resource inspection, transport vehicle preheating, bridge deck measurement and bridge deck cleaning; 2) a production section for producing a mixture and performing quality inspection; 3) the transport section, cast asphalt concrete from the mixing plant, is also constantly stirred and warmed, and therefore cast asphalt concrete requires the use of a special transport equipment cast asphalt truck (commonly known as a cookie) with heating and stirring devices. The pouring asphalt transport vehicle (Cooker) is a container with a heating and heat-insulating control system and a stirring device, and the Cooker is fixed on the transport vehicle in the construction process; and after the Cooker is filled with the mixture in the mixing station, the Cooker is transported to a construction site for spreading. 4) A paving section, which comprises preparation before paving, paving of a mixture, penetration test and post-paving treatment; 5) and detecting the section, setting the seam, processing the boundary, and checking and accepting.
And all the devices are immediately installed and debugged after entering the field. The metering precision of the metering elements restricts the accuracy of test detection results and mixture ratio, and influences the engineering quality, so that before construction, the metering elements in the metering instruments/equipment and various production equipment and detection instruments are calibrated according to the regulations of various verification/calibration instruction manuals for road engineering test detection instruments (engineering quality supervision bureau of department of transportation) and metrological verification regulations of department of transportation. The calibration of the main metering elements is qualified through the verification of a metering department, and the self-inspection calibration of the self-calibration equipment is carried out under a supervision side station. All the measuring instruments/equipment are used within the calibration period of validity. The calibration work of the feeding speed of the cold material bin of the asphalt mixing plant is very important, for the same aggregate, the actual feeding speed of the cold material bin depends on the opening size of a single-bin discharging bin door and the rotating speed of a single-bin motor, and the feeding speed of the cold material bin must be calibrated before the production of asphalt mixture. The calibration of the feeding speed of the cold storage bin of the asphalt mixing plant in the step 1 comprises the following steps;
a) preliminarily determining the size of an opening of a discharge port of a cold bunker of a mixing plant according to the requirement of the production progress of the asphalt mixture of the project, and fixing the size of the opening;
b) respectively adopting the rated lowest rotating speed to the highest rotating speed of a mixing plant, independently feeding a certain cold storage bin for 5min at 5 points, and adopting a mixing plant metering system to meter the fed stone material to obtain a relation curve of the rotating speed and the feeding speed of the storage bin under the condition of the opening size;
c) when the feeding rotating speed required by a certain graded mixture is higher or lower than the allowable rotating speed range of the mixing plant, re-adjusting the opening size of the cold storage bin, and re-completing the measurement to ensure that the rotating speeds corresponding to all the required feeding speeds are within the allowable range of mechanical equipment;
d) after the calibration of the single cold material bin is completed, a relation curve chart between the feeding speed of the single cold material bin and the motor rotating speed shown in fig. 5 is formed, and the motor rotating speed value corresponding to each feeding speed value is calculated by adopting an interpolation method.
As shown in fig. 2, the raw material mix proportion design in step 1 includes the following steps:
a) selecting raw materials comprising aggregate, mineral powder, modified asphalt and additives;
b) detecting whether the performance of the raw materials meets the requirements, if so, reselecting the raw materials, and if so, executing the step c);
c) selecting mineral aggregate gradation, fitting coarse, medium and fine three-level gradation in a design gradation range, and performing initial oil and petrochemical processing by 7.7%;
d) carrying out a Liu-Eel fluidity test and a penetration test to determine the optimal gradation;
e) changing the oilstone ratio by +/-0.3 percent, carrying out five groups of different oilstone ratios, respectively carrying out a Liu-Er fluidity test and a penetration test, detecting whether the requirements are met, if not, adjusting the oilstone ratio to carry out the test again, and if so, executing the step f);
f) and (4) detecting whether the low-temperature performance meets the requirement, if not, adjusting the oilstone ratio to perform the test again, and if so, determining the final mixing ratio.
The design process of the mix proportion of the pouring asphalt concrete is relatively simple, the compatibility between the fluidity of the mixture and the high-temperature stability is mainly considered in the design process, the formula of the pouring mixture obtained by the design of the mix proportion can be suitable for the large-scale production of a mixing plant, the selection of various test parameters of a laboratory is also depended, and the determination of the test parameters is greatly derived from the correlation between the test result of the laboratory and the actual condition of the mixture of a construction site.
Whether reasonable, the direct influence cast asphalt concrete's construction quality is compared to the mix proportion design result, if the mix proportion design is improper, then cast asphalt concrete's construction is wrong from the source, must lead to cast asphalt concrete production the dry or segregation phenomenon of mixture to appear.
As shown in fig. 3, the mix design control includes the following four aspects:
a. raw material selection
The performance of the modified asphalt reaches the design requirement and meets the actual requirement of the cast mixture; the aggregate performance meets the design, and the strength is not attenuated after the action at the high temperature of 300 ℃; the mineral powder is required to be pure, the impurity content does not exceed 5 percent, the passing rate of 0.075mm is required to be more than 80 percent, and the quality is stable;
b. target ratio and production ratio
The feeding speed of the cold storage bin is accurately calibrated, and the measured data is ensured to be consistent with the actual feeding quantity; the error is not more than 2%. The casting yield of the project is 60t/h, the total speed of cold material feeding is 80t/h, and when the hot material used for the design of the production mix proportion is sampled, the stirring station is set according to the parameters. And when the hot material is sampled, removing the bottom and the face material of the hot material bin, and taking the middle part as a sample. The grading used for the design of the production mix proportion is fitted according to the optimal grading of the target mix proportion;
c. mix proportion design verification
Setting a stirring station according to production parameters determined by target mixing ratio design and production mixing ratio design, producing at least 20t of mixture, continuously heating and stirring in a Cooker, and testing the performances of the pouring type asphalt mixture with different stirring time (40min, 2h, 4h and 6h) including fluidity and penetration;
d. matters of attention
Paying attention to the balance of evaluation indexes, the design principle of the project is as follows: on the premise of meeting the fluidity requirement of the mixture, the high-temperature stability is improved as much as possible. The test temperature is strictly controlled: heating the mineral aggregate to 240 ℃, asphalt to 185 ℃, and mixing the mineral aggregate with a mixer to 240 ℃. Strictly controlling the process parameters: and (4) dry-mixing the aggregate for 15s, adding the modified asphalt, stirring for 30s, adding the mineral powder, and continuously stirring for 30 min. And strictly unifying the performance test standards to obtain accurate test data.
As shown in fig. 4, in step 2), the cast asphalt concrete is produced by the following steps:
a) the mixing station is debugged normally, and the raw materials are detected to be qualified;
b) heating the broken stone and screening stone;
c) adding mineral powder, and mixing the mineral powder and stone according to the installation and production mix proportion;
d) dry mixing for 15 seconds;
e) adding asphalt and wet-mixing;
f) and (3) loading the raw materials into a Cooker, checking whether the pressure, the temperature and the state of the mixture of the raw materials are normal or not, if not, manually observing and processing the raw materials until the raw materials are qualified, then delivering the raw materials out of the factory, if the raw materials are unqualified, discarding the raw materials, and if the pressure, the temperature and the state of the mixture of the raw materials are normal, directly delivering the raw materials out of the factory.
The heating temperature of the polymer modified asphalt used for the cast asphalt mixture is 175-185 ℃, if the mineral powder is not heated, the stone heating temperature is 290-340 ℃, if the mineral powder is heated, the stone temperature is about 230-260 ℃, the discharge temperature after the mixture is stirred is 220-250 ℃, because the mineral powder content in the mixture is very large, the mixing time of the mixture is longer, the mixing time is 15s of dry mixing and 90s of wet mixing, and a proper amount of warm mixing agent for improving the fluidity can be added in the wet mixing process, and the processes are determined after the on-site test mixing. The pouring asphalt mixture has high mixing temperature and long mixing time, so that the pouring asphalt mixture has high requirements on the mixing capability and the high-temperature resistance of a mixing plant. Meanwhile, the asphalt used by the cast asphalt mixture has high viscosity and high asphalt content, the mixture is easy to adhere to equipment, after production is finished each time and the equipment is not completely cooled, the adhered mixture is thoroughly cleaned, and a material conveying trolley, a storage tank or a discharge hopper is cleaned and coated with a separant before production. The mixing process should be fully careful about the addition of the mineral powder, the use level of the modified asphalt and the control of the discharging temperature. Meanwhile, the feeding speed of the cold storage bin is set to fully take the powder loss (<0.3mm material) of the fine aggregate in heating blast air into consideration. If any abnormal condition is found, the machine is stopped immediately to process, the paving site is informed, and the construction cannot be recovered before the reason for the abnormal condition is not found and solved.
In step 4), a) preparing before paving comprises: performing performance detection before the Cooker enters a working surface, wherein the appearance state of the mixture is normal, the temperature of the mixture is more than or equal to 220 ℃, and the construction workability is subject to proper paving; the side baffle is placed according to a pre-planned paving scheme, so that the accuracy of the paving width is ensured, and if a bidirectional cross slope bridge floor is met, the bridge cannot be paved across a slope; setting the thickness of the paving baffle, adopting a high-temperature non-deformable steel template, and adjusting the paving height through cushion blocks with different heights according to the elevation measurement data; before the pouring type paving, the waterproof layer is kept clean and dry, a blower is used for blowing and drying when necessary, oil stains are polluted and cleaned in time, and oil stains are absolutely not allowed to exist; the condition of the epoxy resin waterproof system layer at the construction area one day after construction should be carefully checked one day before construction, and if the epoxy resin waterproof system layer is damaged, the epoxy resin waterproof system layer should be timely treated. The casting type paving controls the flatness of the paving layer according to the heights of the cushion blocks and the side limit baffles, so that accurate measurement is needed to be carried out, and the heights of the side limit baffles are accurately positioned. Before the Cooker transport vehicle enters a construction site, the tires and the bottom plate of the Cooker transport vehicle are cleaned, so that the transport vehicle is prevented from polluting the bridge deck. The field constructor should put on the shoe cover to ensure the cleanness of the construction field. The timely supply of materials should be ensured, the inspection of construction machinery and the allocation of personnel should be enhanced, and artificial cold joints caused by materials, personnel or machinery should be prevented. The pouring asphalt concrete paves, because its intensity of labour is big, and ambient temperature is high, should make the safety protection work fully, equip necessary labour protection articles for use.
b) The cast asphalt transportation comprises the following steps: the cast asphalt mixture produced from a mixing plant needs to be continuously stirred and heated, so that the cast asphalt mixture uses special transportation equipment (foreign called Cooker), the temperature of the Cooker is preheated to about 160 ℃ before the initial feeding of the Cooker, the mixture filled in the Cooker is continuously stirred, and the temperature of the mixture is increased to 220-250 ℃; the pouring type asphalt mixture should be prevented from staying too long in a high-temperature Cooker vehicle as much as possible, the staying time cannot be too long when the temperature exceeds 250 ℃, and the stirring time of the mixture in the Cooker is at least more than 40 min; the heating temperature must be adjusted when discharging from the Cooker vehicle transporting the mixture to avoid the binder from hardening, and the stirring speed must be slowed down to prevent oxygen in the air from entering the cast asphalt to reduce the oxidation of the binder;
c) the mixture spreading comprises the following steps: the pouring type asphalt mixture is self-flow formed without rolling, and the GA10 type pouring type asphalt mixture needs to be paved by a special pouring type paver.
(1) Side limitation and thickness control, wherein the cast asphalt concrete has fluidity when being paved at 220-260 ℃, the side limitation needs to be set to prevent the mixture from flowing laterally, the side limitation adopts a square steel pipe with the thickness of 32mm as a template and is arranged at the edge of a lane joint, and iron sheets or wood sheets with different thicknesses are used for adjustment according to the surface flatness of the steel plate so as to achieve the purpose of ensuring the paved surface to be smooth;
(2) pouring type paving is adopted in the project plan, two paving machines are adopted for paving, the edge part of each half bridge is manually paved, the reserved paving machines are in crawler running and safe areas, a Cooker is backwards moved to the front of the paving machines when a pouring type mixture is paved, the mixture is directly unloaded on a bridge deck through a discharge chute at the back of the pouring type mixture, a distributing plate in the position right in front of a leveling plate of the paving machines moves left and right, the pouring type asphalt mixture is paved, the paving machines move forwards at the speed of 1-2m/min, and the asphalt mixture is leveled to the control thickness;
(3) spreading of ready-mixed gravel
In order to improve the binding force and the overall shear strength between the cast asphalt concrete and the upper pavement layer, after the cast asphalt concrete construction is completed, 4.75-9.5 mm of pre-mixed asphalt macadam is spread with the use amount of 5-10 kg/m2, when the temperature of the spread cast asphalt concrete is lowered to a proper temperature (about 190-210 ℃), 4.75-9.5 mm of macadam pre-mixed with 0.3-0.5% of asphalt is manually spread, and the macadam is pressed into the cast asphalt concrete by a manual roller. In the process of spreading the ready-mixed asphalt macadam, a specially assigned person is responsible for checking the spreading condition of the macadam, timely cleaning and processing the spreading and stacking part, and timely supplementing the missing spreading in place. And after molding, uniformly distributing the premixed asphalt macadam on the surface of the cast concrete, and embedding 1/2-2/3 of the premixed asphalt macadam into the cast concrete.
(4) Removing the side, fully cooling the pavement layer before the limitation of the side is removed, and leaving a side connection with clear outline;
d) the penetration test included: in the paving process, 3 vehicles are randomly selected from all transport vehicles for sampling, each vehicle is used for preparing a penetration test block, and the test blocks to be tested are cooled and brought back to a test room for penetration and penetration increment tests;
e) the post-paving treatment comprises the following steps: observing the bubble swelling position at any time, and puncturing bubbles caused by water vapor before the mixture loses fluidity; rolling the gravels with poor embedding effect by a roller; and (5) slightly reducing the temperature of the mixture, and removing the paving template when the mixture is basically molded.
The steel bridge floor sand blasting waterproof construction comprises the following steps;
a) treatment before blasting
Before sand blasting, the appearance of the steel bridge deck plate is firstly checked to ensure that the surface has no welding beading, splashes, pinholes, flash, burrs and the like, otherwise, the steel bridge deck plate is cleaned by polishing, and sharp corners are required to be processed to be round corners with the radius of more than 2 mm; cleaning oil, grease, salt and other dirt on the surface of the steel bridge deck by using a cleaning agent or a solvent; cleaning with high-pressure clear water until no oil stain or dust dirt exists;
b) sand blasting rust removal
The environmental requirement is that when the weather such as rain, condensation and the like is met, the rust removal operation is strictly forbidden, the temperature of the steel plate is higher than the dew point by more than 3 ℃, and the relative humidity is less than or equal to 85 percent; the grinding material is required to be steel shots and steel corner sand, the proportion of the steel shots and steel corner sand is determined through experiments, and the grinding material must be kept dry and clean and does not contain harmful substances such as grease and salt; the quality requirement of sand blasting, the requirement that the surface of the steel bridge deck plate after sand blasting and rust removal should reach the required roughness of GB/T8923.1-2011 standard Sa2.5 must reach Rz: 50-100 μm; the sand blasting equipment adopts a movable automatic dust-free shot blasting machine with a dust suction device, and can adopt a side belt type sand blasting machine for operation or manual treatment on areas and edges which cannot be constructed by the automatic dust-free shot blasting machine;
c) construction of waterproof bonding layer
(1) The environment is required, the sprayed base surface is dry, clean, free of oil stain, foreign matters and dust, and when the sprayed base surface meets weather conditions such as rain, snow and dew, the coating operation is strictly prohibited, the environment temperature is-10-50 ℃, the relative humidity is less than or equal to 85%, and the temperature of the steel plate is higher than the dew point by more than 3 ℃; (2) waterproof bonding layer operation: and (3) constructing the epoxy zinc-rich paint, and after the sand blasting rust removal inspection is qualified, implementing the anticorrosion primer within 3 h. Construction is carried out by adopting a spraying mode, the using amount of the primer is 100-200 g/m2, the drying time of the anticorrosion primer depends on the field environment, the curing time at the temperature of 10 ℃ is about 3 hours, and the curing time at other temperatures refers to the product specification; the construction of an epoxy resin waterproof layer, after the anticorrosion primer is cured, manually scraping and coating an epoxy resin waterproof material, and constructing in two layers, wherein the first layer is strictly executed according to the formula of 150 plus 250 g/square meter, the second layer is strictly executed according to the formula of 250 plus 350 g/square meter, after the first coating is cured, the next layer is executed, the interval time depends on the temperature, the site determination is carried out by referring to a product specification and combining with a complete curing standard, and after all components of the epoxy resin are prepared in proportion, a stirrer is used for stirring for more than 5 min; the small broken stone spreading is carried out by experienced construction personnel according to the design requirement (spreading 1.18-2.36mm coarse sand, the using amount of 600 plus 700 g/square meter), the small broken stone spreading is carried out by following the construction progress of the epoxy resin, and when the broken stones are spread, nailing shoes are needed to enter, so that sundries cannot be brought in, and the spreading is uniform and has no overlap. The steel bridge deck pavement of the project adopts double-layer epoxy resin scattered broken stones as a waterproof layer, and simultaneously adopts solvent type rubber asphalt binder as a bonding layer, so that effective waterproof bonding of the steel bridge deck and the pavement layer is ensured.
In the process of waterproof layer construction, the vertical surfaces of structures such as wheel-protecting safety belts, water drainage grooves and the like which are connected with the steel plates of the traffic lanes are coated with epoxy resin waterproof materials together in a manual roll coating mode. During construction, the part which does not need to be coated with the epoxy resin waterproof layer is protected. The painted area is also protected, and the pollution of oil, grease, dirt and the like is severely prevented. If the painted area is damaged, the painted area is repaired according to the damage degree. During construction, the appearance of the epoxy bonding layer is inspected by naked eyes, the appearance is required to be flat and uniform without bubbles, cracks, falling off and missing coating, and if the requirement is not met, the epoxy bonding layer needs to be repaired or coated again. During construction, a certain area is coated by fixed weight for control, and rechecking is carried out according to the daily material consumption and the constructed area.
(3) Constructing a solvent type binder, namely completely curing an epoxy resin waterproof layer and then constructing the solvent type binder; the construction of the solvent-based binder can adopt a spraying or rolling mode, the coating omission and excess are ensured, and the pavement layer can be constructed only after the solvent-based binder is completely volatilized after the construction is finished.
In the step 5), the construction joints are arranged in a mode that construction joints are required to be arranged according to the specific conditions of engineering during the construction of the pouring type asphalt concrete, longitudinal construction joints are arranged as far as possible and are interfaces between lanes and between the lanes and the side bands, no transverse construction joint is arranged, and if special conditions are met and construction transverse joints need to be arranged, the transverse joints are arranged at the position of 1/4 degrees of the interval between the top beams.
In the paving process, except the bridge expansion joint, transverse construction joints are not arranged at other parts as much as possible. If the material is equal and the weather changes and other reasons happen, construction joints are required to be arranged at other parts, and transverse construction joints are arranged according to the following method. The steel or wood baffle limited by the side is cut into the same length as the width of the cast paving, the cast paving is placed at the position where a construction joint is arranged, the paver is lifted a little, the cast paving is moved out of the transverse baffle to abut against the transverse baffle, the mixed material is plastered to the close-fitting baffle by manually plastering the plate, and the mixed material is plastered and beaten to be solid. Fixing the transverse baffle, and dismantling the baffle after the mixture is cooled. Finally, the concrete is given a vertical transverse section and the loose mix is knocked off. Before the pouring type mixture is laid at the joint, a joint strip is pasted along the joint, the height of the spreading machine is adjusted to be the same as that of a paving layer, and after the mixture is uniformly spread by the cloth plate, the spreading machine can be started to carry out normal paving. The newly laid mixture at the joint should be observed and should be immediately handled manually if loose pitted surface occurs.
Longitudinal joints are produced during construction because the deck cannot be paved in full width. The baffle plate used for side limitation should be coated with a release agent, and after the mixture is cooled to form a certain strength, the baffle plate can be removed, so that the seam keeps a smooth and vertical cross section. Before the construction of the longitudinal joint, the joint interface of the original asphalt concrete is checked, the cast asphalt concrete with pitted surface, loose and lower layer falling off is removed in time, after the construction is finished clearly, a joint strip is pasted at the longitudinal side joint, and simultaneously, the joint is preheated, so that the compactness and integrity of the whole pavement are ensured. After the spreading machine, special personnel should be arranged to timely treat the place where the seam has missed pavement and pitted surface, if necessary, a spray gun is additionally used for heating to soften the original pavement, a tool is used for kneading to flatten the surface of the pavement, and the premixed macadam is pressed in.
In the step 5), the boundary processing mode is as follows, in order to facilitate the paving operation of the paver, an edge band with the width of 50-60 cm is left at the position, close to a sidewalk, of the poured asphalt concrete, and the edge band is paved and leveled manually; the construction process of the edge band comprises the following steps: unloading the cast asphalt concrete into a sealed hopper car, manually conveying the cast asphalt concrete to an edge zone construction position, manually paving and leveling the cast asphalt concrete by using a leveling tool, and spreading asphalt pre-mixed broken stones; spreading amount of broken stones: 4-7 kg/m2, and rolling the gravels with poor embedding effect by using a roller.
In the description of the present invention, it should be noted that the terms "left", "right", "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be mechanically or electrically connected, directly or indirectly through intervening media, or may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Claims (9)
1. A pouring type asphalt concrete paving construction process is characterized by comprising the following steps:
1) preparation section
Calibrating a metering instrument and equipment, and carrying out raw material mixing ratio design, transport vehicle preheating, bridge deck measurement and bridge deck cleaning;
2) production section
Carrying out production of the mixture and carrying out quality inspection;
3) transport section
4) Paving section
The method comprises the steps of steel bridge deck sand blasting waterproof construction, preparation before paving, pouring type asphalt transportation, mixture paving, penetration test and after-paving treatment;
a) the preparation before paving comprises the following steps: before the Cooker enters a working surface, performing performance detection, wherein the appearance state of the mixture is normal, and the temperature of the mixture is more than or equal to 220 ℃; placing a side baffle plate, wherein the paving baffle plate adopts a high-temperature non-deformable steel template;
b) the cast asphalt transportation comprises the following steps: before the primary feeding of the Cooker, preheating the Cooker to about 160 ℃, continuously stirring the mixture filled into the Cooker, and simultaneously heating the mixture to 220-250 ℃; the stirring time of the mixture in the Cooker is more than 40 min;
c) the mixture spreading comprises the following steps:
(1) side limit and thickness control, wherein the side limit adopts a 32mm square steel pipe as a template and is arranged at the edge of a lane joint;
(2) pouring type paving, wherein during the pouring type mixture paving, the Cooker moves backwards to the front of the paver, the mixture is directly unloaded on the bridge deck through a discharge chute at the back of the Cooker, a distributing plate in the position, right in front of a leveling plate of the paver, moves left and right, the pouring type asphalt mixture is spread, the paver moves forwards at the speed of 1-2m/min, and the asphalt mixture is leveled to a controlled thickness;
(3) spreading of ready-mixed gravel
After the cast asphalt concrete construction is completed, 4.75-9.5 mm of premixed asphalt macadam is spread, and the using amount is 5-10 kg per square meter;
(4) removing the side, fully cooling the pavement layer before the limitation of the side is removed, and leaving a side connection with clear outline;
d) the penetration test included: in the paving process, 3 vehicles are randomly selected from all transport vehicles for sampling, each vehicle is used for preparing a penetration test block, and the test blocks to be tested are cooled and brought back to a test room for penetration and penetration increment tests;
e) the post-paving treatment comprises the following steps: observing the bubble bulging position at any time, puncturing bubbles caused by water vapor before the mixture loses fluidity, rolling and embedding gravels with poor effect by using a roller, slightly reducing the temperature of the mixture, and removing the paving template during basic molding;
5) detecting a segment
Setting and processing the boundary of the seam, and checking and accepting.
2. The pouring type asphalt concrete paving construction process according to claim 1, wherein the calibration of the feeding speed of the cold storage bin of the asphalt mixing plant in the step 1 comprises the following steps;
a) preliminarily determining the size of an opening of a discharge port of a cold bunker of a mixing plant according to the requirement of the production progress of the asphalt mixture of the project, and fixing the size of the opening;
b) respectively adopting the rated lowest rotating speed to the highest rotating speed of a mixing plant, independently feeding a certain cold storage bin for 5min at 5 points, and adopting a mixing plant metering system to meter the fed stone material to obtain a relation curve of the rotating speed and the feeding speed of the storage bin under the condition of the opening size;
c) when the feeding rotating speed required by a certain graded mixture is higher or lower than the allowable rotating speed range of the mixing plant, re-adjusting the opening size of the cold storage bin, and re-completing the measurement to ensure that the rotating speeds corresponding to all the required feeding speeds are within the allowable range of mechanical equipment;
d) after the calibration of the single cold material bin is completed, a relation curve chart between the feeding speed of the single cold material bin and the rotating speed of the motor is formed, and the rotating speed value of the motor corresponding to each feeding speed value is calculated by adopting an interpolation method.
3. The cast asphalt concrete paving construction process according to claim 1, wherein the raw material mix proportion design in the step 1 comprises the following steps:
a) selecting raw materials comprising aggregate, mineral powder, modified asphalt and additives;
b) detecting whether the performance of the raw materials meets the requirements, if so, reselecting the raw materials, and if so, executing the step c);
c) selecting mineral aggregate gradation, fitting coarse, medium and fine three-level gradation in a design gradation range, wherein the initial oilstone ratio is 7.7%;
d) carrying out a Liu-Eel fluidity test and a penetration test to determine the optimal gradation;
e) changing the oilstone ratio by +/-0.3 percent, carrying out five groups of different oilstone ratios, respectively carrying out a Liu-Er fluidity test and a penetration test, detecting whether the requirements are met, if not, adjusting the oilstone ratio to carry out the test again, and if so, executing the step f);
f) and (4) detecting whether the low-temperature performance meets the requirement, if not, adjusting the oilstone ratio to perform the test again, and if so, determining the final mixing ratio.
4. The process of claim 3, wherein the design control of the mix ratio comprises the following four aspects:
a. raw material selection
The performance of the modified asphalt reaches the design requirement and meets the actual requirement of the cast mixture; the aggregate performance meets the design, and the strength is not attenuated after the action at the high temperature of 300 ℃; the mineral powder is required to be pure, the impurity content does not exceed 5 percent, the passing rate of 0.075mm is required to be more than 80 percent, and the quality is stable;
b. target ratio and production ratio
The feeding speed of the cold storage bin is accurately calibrated, and the measured data is ensured to be consistent with the actual feeding quantity; the error is not more than 2%. The casting yield of the project is 60t/h, the total speed of cold material feeding is 80t/h, and when the hot material used for the design of the production mix proportion is sampled, the stirring station is set according to the parameters. And when the hot material is sampled, removing the bottom and the face material of the hot material bin, and taking the middle part as a sample. The grading used for the design of the production mix proportion is fitted according to the optimal grading of the target mix proportion;
c. mix proportion design verification
And setting a stirring station according to production parameters determined by the target mixing ratio design and the production mixing ratio design, producing at least 20t of mixture, continuously heating and stirring in a Cooker, and testing the performances of the cast asphalt mixture including fluidity and penetration degree for different stirring time (40min, 2h, 4h and 6 h).
5. The process for paving and constructing the cast asphalt concrete according to claim 1, wherein in the step 2), the cast asphalt concrete is produced by the following steps:
a) the mixing station is debugged normally, and the raw materials are detected to be qualified;
b) heating the broken stone and screening stone;
c) adding mineral powder, and mixing the mineral powder and stone according to the installation and production mix proportion;
d) dry mixing for 15 seconds;
e) adding asphalt and wet-mixing;
f) and (3) loading the raw materials into a Cooker, checking whether the pressure, the temperature and the state of the mixture of the raw materials are normal or not, if not, manually observing and processing the raw materials until the raw materials are qualified, then delivering the raw materials out of the factory, if the raw materials are unqualified, discarding the raw materials, and if the pressure, the temperature and the state of the mixture of the raw materials are normal, directly delivering the raw materials out of the factory.
6. The cast asphalt concrete pavement construction process as claimed in claim 5, wherein the heating temperature of the polymer modified asphalt used in the cast asphalt mixture is 175-185 ℃, if the ore powder is not heated, the heating temperature of the stone material is 290-340 ℃, if the ore powder is heated, the temperature of the stone material is about 230-260 ℃, the discharging temperature after the mixture is mixed is 220-250 ℃, the mixing time is 15s for dry mixing and 90s for wet mixing, and a proper amount of warm mixing agent for improving fluidity can be added in the wet mixing process.
7. The pouring type asphalt concrete pavement construction process according to claim 1, wherein in the step 4), the steel bridge deck sand blasting waterproof construction comprises the following steps;
a) treatment before blasting
Before sand blasting, the appearance of the steel bridge deck plate is firstly checked to ensure that the surface has no welding beading, splashes, pinholes, flash, burrs and the like, otherwise, the steel bridge deck plate is cleaned by polishing, and sharp corners are required to be processed to be round corners with the radius of more than 2 mm; cleaning oil, grease, salt and other dirt on the surface of the steel bridge deck by using a cleaning agent or a solvent; cleaning with high-pressure clear water until no oil stain or dust dirt exists;
b) sand blasting rust removal
The environmental requirement is that when the weather such as rain, condensation and the like is met, the rust removal operation is strictly forbidden, the temperature of the steel plate is higher than the dew point by more than 3 ℃, and the relative humidity is less than or equal to 85 percent; the grinding material is required to be steel shots and steel corner sand, the proportion of the steel shots and steel corner sand is determined through tests, and the grinding material must be kept dry and clean and does not contain harmful substances; the quality requirement of sand blasting, the surface of the steel bridge deck after sand blasting and rust removal should meet the requirement of GB/T8923.1-2011 standard Sa2.5, and the requirement of roughness must reach Rz: 50-100 μm; the sand blasting equipment adopts a movable automatic dust-free shot blasting machine with a dust suction device;
c) construction of waterproof bonding layer
(1) The environment is required, the sprayed base surface is dry, clean, free of oil stain, foreign matters and dust, and when the sprayed base surface meets weather conditions such as rain, snow and dew, the coating operation is strictly prohibited, the environment temperature is-10-50 ℃, the relative humidity is less than or equal to 85%, and the temperature of the steel plate is higher than the dew point by more than 3 ℃;
(2) waterproof bonding layer operation: and (3) constructing the epoxy zinc-rich paint, and after the sand blasting rust removal inspection is qualified, implementing the anticorrosion primer within 3 h. The construction is carried out by adopting a spraying way, and the using amount of the primer is 100-200 g/m2The curing time is 3 hours at the temperature of 10 ℃; then, carrying out epoxy resin waterproof layer construction, after the anticorrosion primer is cured, manually scraping and coating an epoxy resin waterproof material, and constructing in two layers, wherein the first layer is 250 grams per square meter according to 150-Strictly executing 0-350 g/square meter, and applying the next layer after the first coating is cured; after the epoxy resin waterproof layer is constructed, small broken stones should be spread immediately.
(3) Constructing a solvent type binder, namely completely curing an epoxy resin waterproof layer and then constructing the solvent type binder; the construction of the solvent type binder adopts a spraying mode, and the paving layer is constructed after the solvent type binder is completely volatilized after the construction is finished.
8. A poured asphalt concrete paving construction process as claimed in claim 1, wherein, in step 5), the construction joints are arranged in such a way that construction joints are arranged according to the specific conditions of the engineering during the poured asphalt concrete construction, longitudinal construction joints are arranged, which are the interfaces between the traffic lanes and the side bands respectively, no transverse construction joint is arranged, and if special conditions are met, the construction transverse joints are arranged at about 1/4 of the top beam interval.
9. The process of claim 1, wherein in step 5), the boundary is processed in such a way that, in order to facilitate the paving operation of the paver, an edge band with a width of 50-60 cm is left at a position close to the sidewalk for paving and leveling by manual work; the construction process of the edge band comprises the following steps: unloading the cast asphalt concrete into a sealed hopper car, manually conveying the cast asphalt concrete to an edge zone construction position, manually paving and leveling the cast asphalt concrete by using a leveling tool, and spreading asphalt pre-mixed broken stones; spreading amount of broken stones: 4-7 kg/m2, and rolling the gravels with poor embedding effect by using a roller.
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