1. The novel modified asphalt concrete pavement pouring construction method for the continuous steel box girder bridge floor is characterized by comprising the following steps of:

step one, sand blasting and rust removing of a steel bridge deck: before sand blasting, the stains on the surface of the steel plate are cleared, and the parts with serious rust are firstly subjected to local pretreatment by using fine steel grit and then subjected to overall sand blasting;

step two, the construction of a methacrylic resin waterproof bonding system:

1) and (3) methacrylic acid anticorrosive primer construction: after the steel bridge deck panel is qualified by sand blasting and rust removing inspection, an anticorrosion base coat is applied within 3 hours, roller coating construction is adopted, and the using amount is not less than 200g/m²The thickness of the dry film is 50 μm;

2) and (3) construction of a methacrylic resin waterproof layer: after the anti-corrosion primer is cured, spraying a methacrylic resin waterproof material, constructing in two layers, wherein the total dosage is 2500-;

3) and (3) construction of a methacrylic resin binder: after the methacrylic resin waterproof layer is sprayed and completely cured, immediately spraying an acrylic resin binder, and constructing by adopting a brush coating and roll coating method;

step three, paving a lower-layer pouring type asphalt concrete GA10 construction:

1) construction preparation: keeping the waterproof layer clean and dry;

2) mixing of the pouring type asphalt mixture: controlling the mixing temperature of the mixture: if the mineral powder is not heated, the heating temperature of the stone is 320 ℃, the discharging temperature of the mixed mixture is 220-250 ℃, and if the mineral powder is heated, the temperature of the stone is 230-260 ℃;

3) paving a pouring type asphalt mixture:

the side limit pouring type asphalt concrete has fluidity when being paved at 220-260 ℃, and a steel baffle plate with the thickness of 45mm and the width of 100mm is used as the edge of the side limit arranged at the connection part of the driveway; after a self-propelled gravel spreader follows a paver, spreading 5-10 mm pre-mixed 0.3-0.5% asphalt gravel with the dosage of 3-6 kg/m when the temperature of the paved concrete is reduced to a proper temperature²Pressing the broken stone into the pouring asphalt concrete by using a manual roller;

4) processing seams and boundaries;

step four, self-repairing type bonding emulsified asphalt construction: the bonding layer adopts self-repairing type bonding emulsified asphalt, the lower layer pouring type asphalt concrete GA10 and the upper layer paving modified asphalt SMA13 are adopted, the aggregate selected at the bonding layer between the lower layer paving and the upper layer paving is crushed stone aggregate with the grain diameter of 5-10 mm, and the bonding material adopts modified emulsified asphalt;

step five, paving an upper layer of modified asphalt SMA 13: the construction process of the modified asphalt SMA13 is a conventional construction process and comprises mixing, transporting, paving and compacting;

step six, transverse seam, longitudinal seam and edge treatment: the horizontal construction joint is made into a 45-degree or 60-degree hot oblique joint, bonding material is sprayed on the oblique joint surface during construction to ensure good interlayer bonding, and different paving widths are added at the longitudinal joint and the edge of the bridge deck to be bonded together well to form a whole.

2. The novel continuous steel box girder bridge floor modified asphalt concrete pavement pouring construction method as claimed in claim 1, wherein the methacrylic resin waterproof material in the second step comprises two resin components A and B and a catalyst, the catalyst is added into the component B before construction, and then the mixture is stirred and sprayed with the component A; when the acrylic resin adhesive is sprayed, the adhesive is separated from the short-term joints and the lap joint areas by using a straight ruler or other tools, and the dosage of the waterproof adhesive is not less than 300 g/square meter.

3. The novel continuous steel box girder bridge floor modified asphalt concrete pavement pouring construction method is characterized in that the mixing time of the three-step pouring asphalt mixture is 15 seconds of dry mixing and 90 seconds of wet mixing; during the paving process of the cast asphalt concrete, partial bubbles are generated, and a tool with a pointed end is used for puncturing and discharging internal air.

4. The novel continuous steel box girder bridge floor modified asphalt concrete pavement pouring construction method as claimed in claim 1, wherein the step four is to perform interlayer gravel spreading after the lower layer is paved for a certain distance and before the pouring asphalt mixture is solidified, the gravel spreading vehicle is required to perform continuous uniform speed in the spreading process to ensure the uniformity of gravel spreading, and then the gravel spreading vehicle is rolled by an artificial rollerThe method comprises the steps of pressing 1/3-1/2 particle size parts of the scattered gravels into a paved lower layer, spraying modified emulsified asphalt on the paved lower layer after paving the paved lower layer and before paving an upper layer, paving an SMA surface layer, and paving a self-repairing type bonding emulsified asphalt layer with the dosage of 300-500 g/m-²The construction is carried out one day before the SMA13 construction, and the uniform spreading and the full spreading are required.

Background

The application proportion of the steel bridge in domestic bridge construction is gradually improved, and the pavement of the steel bridge deck is also an industrial problem all the time. In terms of technical aspect, the steel box girder is a large thin-wall space structure, under the action of vehicle load, temperature and wind load, the stress inside the bridge deck system is complex, the steel box girder can deform by extension, shortening, bending, torsion and the like, and the bridge deck pavement requires the capability of cooperatively deforming along with the steel box girder. And because the structure of the pavement is different from that of a highway pavement or an airport pavement, the traditional bridge pavement layer is often damaged shortly after being used. Typical diseases mainly include the defects of cracks, waves, choking, pushing, ruts and the like on the bridge deck caused by insufficient bonding force between a bridge deck pavement layer and a bridge deck and overhigh temperature of the bridge deck system.

Disclosure of Invention

The invention aims to provide a novel pouring type construction method for a modified asphalt concrete pavement, which is suitable for paving a large-span steel structure bridge floor by using asphalt concrete and a continuous steel box girder bridge floor.

The novel modified asphalt concrete pavement pouring construction method for the continuous steel box girder bridge floor comprises the following steps:

step one, sand blasting and rust removing of a steel bridge deck: before sand blasting, the stains on the surface of the steel plate are cleared, and the parts with serious rust are firstly subjected to local pretreatment by using fine steel grit and then subjected to overall sand blasting;

step two, the construction of a methacrylic resin waterproof bonding system:

1) methacrylic acid inhibitorAnd (3) corrosion primer construction: after the steel bridge deck panel is qualified by sand blasting and rust removing inspection, an anticorrosion base coat is applied within 3 hours, roller coating construction is adopted, and the using amount is not less than 200g/m²The thickness of the dry film is 50 μm;

2) and (3) construction of a methacrylic resin waterproof layer: after the anti-corrosion primer is cured, spraying a methacrylic resin waterproof material, constructing in two layers, wherein the total dosage is 2500-;

3) and (3) construction of a methacrylic resin binder: after the methacrylic resin waterproof layer is sprayed and completely cured, immediately spraying an acrylic resin binder, and constructing by adopting a brush coating and roll coating method;

step three, paving a lower-layer pouring type asphalt concrete GA10 construction:

1) construction preparation: keeping the waterproof layer clean and dry;

2) mixing of the pouring type asphalt mixture: controlling the mixing temperature of the mixture: if the mineral powder is not heated, the heating temperature of the stone is 320 ℃, the discharging temperature of the mixed mixture is 220-250 ℃, and if the mineral powder is heated, the temperature of the stone is 230-260 ℃;

3) paving a pouring type asphalt mixture:

the side limit pouring type asphalt concrete has fluidity when being paved at 220-260 ℃, and a steel baffle plate with the thickness of 45mm and the width of 100mm is used as the edge of the side limit arranged at the connection part of the driveway; after a self-propelled gravel spreader follows a paver, spreading 5-10 mm pre-mixed 0.3-0.5% asphalt gravel with the dosage of 3-6 kg/m when the temperature of the paved concrete is reduced to a proper temperature²Pressing the broken stone into the pouring asphalt concrete by using a manual roller;

4) processing seams and boundaries;

step four, self-repairing type bonding emulsified asphalt construction: the bonding layer adopts self-repairing type bonding emulsified asphalt, the lower layer pouring type asphalt concrete GA10 and the upper layer paving modified asphalt SMA13 are adopted, the aggregate selected at the bonding layer between the lower layer paving and the upper layer paving is crushed stone aggregate with the grain diameter of 5-10 mm, and the bonding material adopts modified emulsified asphalt;

step five, paving an upper layer of modified asphalt SMA 13: the construction process of the modified asphalt SMA13 is a conventional construction process and comprises mixing, transporting, paving and compacting;

step six, transverse seam, longitudinal seam and edge treatment: the horizontal construction joint is made into a 45-degree or 60-degree hot oblique joint, bonding material is sprayed on the oblique joint surface during construction to ensure good interlayer bonding, and different paving widths are added at the longitudinal joint and the edge of the bridge deck to be bonded together well to form a whole.

Furthermore, the methacrylic resin waterproof material in the step two contains two resin components A and B and a catalyst, and the catalyst is added into the component B before construction, is fully stirred uniformly, and is then stirred and sprayed with the component A; when the acrylic resin adhesive is sprayed, the adhesive is separated from the short-term joints and the lap joint areas by using a straight ruler or other tools, and the dosage of the waterproof adhesive is not less than 300 g/square meter.

Further, the mixing time of the pouring type asphalt mixture in the third step is 15s in dry mixing and 90s in wet mixing; during the paving process of the cast asphalt concrete, partial bubbles are generated, and a tool with a pointed end is used for puncturing and discharging internal air.

Further, after the paved lower layer is paved for a certain distance, before the pouring type asphalt mixture is solidified, interlayer broken stone spreading is carried out, a broken stone spreading vehicle is continuously carried out at a constant speed in the spreading process to ensure the uniformity of broken stone spreading, then the 1/3-1/2 particle diameter part of the spread broken stones is pressed into the paved lower layer in a manual roller rolling mode, after the paved lower layer is paved, before the paved upper layer is paved, modified emulsified asphalt is sprayed on the paved lower layer, then an SMA surface layer is carried out, and the using amount of the self-repairing type bonding emulsified asphalt layer is 300-²The construction is carried out one day before the SMA13 construction, and the uniform spreading and the full spreading are required.

Compared with the prior art, the invention has the advantages that:

based on the MA type pouring mode and the GA type pouring mode, the construction method is a construction technology M & GA construction method formed by combining the advantages of the two construction modes and carrying out process improvement on the traditional construction mode. The MA class pouring type asphalt concrete has the technical characteristics of high natural lake asphalt content and strict fine aggregate gradation, so that the MA mixture has stable performance; however, the production process comprises the steps of firstly mixing asphalt, mineral process powder and fine aggregates to generate asphalt mortar, then mixing the asphalt mortar with coarse aggregates to mix the finished mixture, wherein the mixing time is long (4-6h), the construction efficiency is low, and the requirements of large project engineering quantity and tight construction period cannot be well met. The GA pouring type asphalt concrete technology adopts an asphalt mixing plant to mix and produce intensively, can be continuously supplied for construction, and has higher construction efficiency; in the design of the mixing proportion, the natural lake asphalt has less use amount, the fine aggregate grading requirement is loose, and the performance stability of the GA mixture is inferior to that of the MA mixture. Therefore, after the advantages of stable MA performance and the work efficiency of GA process are fully exerted, according to the engineering characteristics and the technical characteristics of MA and GA, the construction mode of mixing MA pouring type asphalt mixture by GA production process is adopted, and the mixture is paved and formed by means of the self-fluidity of the mixture without rolling.

Drawings

FIG. 1 is a process flow diagram of the present invention.

Detailed Description

The novel modified asphalt concrete pavement pouring construction method for the continuous steel box girder bridge floor comprises the following steps:

step one, sand blasting and rust removing of a steel bridge deck:

(1) treatment before blasting

Firstly, before sand blasting, the appearance of a steel bridge deck is checked to ensure that the surface has no welding beading, splashing, pinholes, flash and burrs, or the appearance is eliminated by polishing;

secondly, cleaning the polluted part on the surface of the steel plate by using a cleaning agent or a solvent, and after treating the severely polluted place, completely cleaning the steel bridge deck by using a cleaning agent and high-pressure water;

thirdly, after the cleaning is finished, performing salt content test by using test paper, and performing the next procedure after the test paper is qualified;

(2) the sand blasting rust removal is to carry out local pretreatment on the severely rusted part by using thinner steel grit and then carry out overall sand blasting treatment, after the sand blasting treatment, whether the surface cleanliness reaches Sa2.5 grade or not is compared by using a standard diagram of the surface cleanliness of national standard GB8923-88, and the roughness of the surface is between 50 and 100 mu m;

step two, the construction of a methacrylic resin waterproof bonding system:

(1) and (3) methacrylic acid anticorrosive primer construction:

after the steel bridge deck panel is qualified by sand blasting and rust removing inspection, an anticorrosion base coat is applied within 3h, roller coating construction is generally adopted, the using amount is not less than 200g/m2, the thickness of a dry film is about 50 mu m, the drying time of the base coat is determined according to the field environment, the curing time at the temperature of 10 ℃ is about 60min, and the curing time at other temperatures is referred to a product specification;

(2) and (3) construction of a methacrylic resin waterproof layer:

after the anti-corrosion primer is cured, spraying a methacrylic resin waterproof material, constructing in two layers, wherein the total dosage is 2500-;

(3) and (3) construction of a methacrylic resin binder:

after the methacrylic resin waterproof layer is sprayed and completely cured, the acrylic resin binder is sprayed immediately, construction is carried out by adopting a brushing and rolling method, and during construction, a ruler or other tools are used for separating the binder from the short-term joint and the lap joint area. The dosage of the waterproof adhesive is not less than 300g per square meter, and the next procedure of construction can be carried out after the waterproof adhesive is completely cured;

step three, paving a lower-layer pouring type asphalt concrete GA10 construction:

1) construction preparation:

1. before the pouring type paving, the waterproof layer is kept clean and dry;

2. the casting paver controls the flatness of the pavement layer according to the heights of the cushion block and the side limit baffle plate, so that accurate measurement is required to be carried out, and the height of the side limit baffle plate is accurately positioned;

and 3, before the Cooker transport vehicle enters a construction site, cleaning the tire and the bottom plate of the Cooker transport vehicle to prevent the transport vehicle from polluting the bridge deck. Workers on site should put on the shoe covers to ensure that the construction site is clean;

4. timely supply of materials is guaranteed, inspection of construction machinery and allocation of personnel are enhanced, and artificial cold joints caused by the materials, the personnel or the machinery are prevented;

5. the pouring type asphalt concrete paving needs to fully perform safety protection work and prepare necessary labor protection supplies because of high labor intensity and high environmental temperature;

2) mixing of the pouring type asphalt mixture: because pouring type bituminous mixture mixes the temperature height, the stirring time is long, consequently, have very high requirement to the ability of mixing and high temperature resistance ability of batching plant, and simultaneously, the used pitch viscosity of pouring type bituminous mixture is big, and pitch content is than higher, and the mixture adheres easily on equipment, after production finishes every time, when equipment is not totally cooled yet, the mixture of reply adhesion thoroughly clears up, should handle fortune material dolly, storage tank or discharge hopper clearance and apply paint the separant before production, mixture mix temperature control: if the mineral powder is not heated, the heating temperature of stone is about 320 ℃, the discharging temperature of the mixed material is controlled according to the target of 220-250 ℃, the mixing time of the mixed material is long due to the high content of the mineral powder in the mixed material, the mixing time is 15s for dry mixing and 90s for wet mixing, the processes are determined after field trial mixing, and if the mineral powder is heated, the temperature of stone is about 230-260 ℃;

3) paving a pouring type asphalt mixture:

1. the side limit pouring type asphalt concrete has fluidity when being paved at 220-260 ℃, side limit needs to be set to prevent the mixture from flowing laterally, the side limit adopts a steel baffle plate with the thickness of about 45mm and the width of 100mm, the steel baffle plate 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 a steel plate so as to achieve the purpose of ensuring the paved surface to be smooth;

2. the thickness control is that before the paving, the measurement and lofting are carried out according to the surface condition of the steel plate, the paving thickness at a certain point is determined, then the height of the guide rail and the side limiting plate are adjusted, so that the paving thickness is determined, the leveling plate of the paver is controlled by automatic horizontal equipment, and the pavement with the specified thickness is paved according to the height of the side limiting plate;

3. the pavement of the roadway is to set a reasonable paving width according to the width of the paver and the bridge deck, but the seam is prevented from being positioned in the roadway as much as possible. In the process of paving the cast asphalt concrete, partial bubbles are generated, a tool with a sharp head is adopted for puncturing, the internal air is exhausted, a self-propelled gravel spreader is used for cooling the paved concrete to a proper temperature, 5-10 mm of premixed 0.3-0.5% asphalt gravel is spread, the amount of the premixed 0.3-0.5% asphalt gravel is 3-6 kg/m2, the gravel is pressed into the cast asphalt concrete by a manual roller, a pavement layer is cooled before the limit of the side is removed, a side with clear outline is left for connection, and the traveling speed of the spreader is slowed down as far as possible so as to be matched with the mixing and transporting capacity;

4) processing seams and boundaries;

firstly, in the process of paving a transverse construction joint, arranging transverse construction joints at other parts except a bridge expansion joint as far as possible, if the transverse construction joints are required to be arranged at other parts due to reasons of material waiting, weather change and the like, arranging the transverse construction joints according to the following method, cutting a steel or wood baffle limited by the side into the same length as the width of casting type paving, placing the baffle at the position where the construction joints are arranged, lifting a little of a paver, moving the paver out of the transverse baffle, abutting against the transverse baffle, manually wiping the baffle by hands to wipe the mixture to be close to the baffle, leveling, striking, fixing the transverse baffle, removing the baffle after the mixture is cooled, and finally enabling the concrete to have a vertical transverse section and striking off loose mixture;

secondly, longitudinal joints are generated in the construction process because the bridge deck cannot be paved in a whole width, the joint interface of the original asphalt concrete is checked before the construction of the longitudinal joints, the cast asphalt concrete with rough surfaces, loose surfaces and falling lower layers is removed in time, after the construction is finished clearly, a joint strip is pasted at the longitudinal side joints, meanwhile, the joints are preheated, the compactness and integrity of the whole pavement are ensured, special personnel are arranged behind the paver to timely treat the positions with the missed pavement and the rough surfaces of the joints, if necessary, a spray gun is additionally used for heating to soften the original pavement, a tool is used for rubbing and kneading to flatten the surface of the original pavement, and premixed macadam is pressed in;

step four, self-repairing type bonding emulsified asphalt construction: the bonding layer adopts self-repairing type bonding emulsified asphalt, the lower layer pouring type asphalt concrete GA10 and the upper layer paving modified asphalt SMA13 are adopted, the aggregate selected at the bonding layer between the lower layer paving and the upper layer paving is crushed stone aggregate with the grain diameter of 5-10 mm, and the bonding material adopts modified emulsified asphalt; after paving a lower layer for a certain distance, before a pouring type asphalt mixture is solidified, carrying out interlayer broken stone spreading, continuously carrying out a broken stone spreading vehicle at a constant speed in the spreading process to ensure the uniformity of the broken stone spreading, then pressing 1/3-1/2 particle diameter parts of the spread broken stones into the lower layer, after the lower layer is paved, before paving the upper layer, spraying modified emulsified asphalt on the lower layer, then paving an SMA surface layer, and using the amount of a self-repairing type bonding emulsified asphalt layer of 300-500g/m²The construction is carried out one day before the construction of the SMA13, and the uniform spreading is required and is basically full;

step five, paving an upper layer of modified asphalt SMA 13: the construction process of the modified asphalt SMA13 is a conventional construction process and comprises mixing, transporting, paving and compacting;

step six, transverse seam, longitudinal seam and edge treatment: in the construction process, the paving amplitude is reasonably determined, longitudinal joints are reduced as much as possible on the premise of ensuring the paving quality, according to engineering practice experience, the general paving width is about 3m, the width is set as much as possible to be a lane width, the stress of the longitudinal joints is fully considered when the paving amplitude is determined, under the action of static load of a bridge deck and vehicle load, the maximum transverse tensile stress is borne on the top surface of the bridge deck pavement layer at a longitudinal web plate or a stiffening rib plate and is the most unfavorable transverse stress position through stress analysis of the bridge deck system, so that the longitudinal joint position is prevented from being overlapped with the longitudinal web plate or the longitudinal stiffening rib plate, the distance between the longitudinal joint position and the longitudinal web plate or the longitudinal stiffening rib plate is ensured to be more than 20cm, the longitudinal tensile stress borne by the bridge deck pavement layer at a transverse partition plate is the maximum and is the most unfavorable longitudinal stress position, transverse joints are prevented from being generated within 1m of the longitudinal joint at the position, and the transverse joints of the pavement lower layer and the pavement upper layer are prevented from being overlapped, the interval between the longitudinal joints of the upper layer and the lower layer is not less than 15cm, the interval between the transverse joints is more than 1m, the longitudinal joints, the transverse joints and the edges are weak links for generating pavement layer diseases, the positions of the longitudinal joints and the transverse joints are recorded, the positions are monitored in the later operation bridge deck maintenance, the transverse construction joints are made into 45-degree or 60-degree hot oblique joints, bonding materials are sprayed on the oblique joint surfaces during construction to ensure good interlayer bonding, and different pavement widths are added at the longitudinal joints and the bridge deck edges to be bonded together well to form a whole.

The process principle is as follows:

the construction method combines the advantages of GA and MA processes, coarse and fine aggregates are mixed by cold materials according to a target mixing ratio, dried and heated to a specified temperature, secondary screening is carried out, the materials are stored in hot storage bins, then the materials are supplied according to a production mixing ratio, the materials are heated to the specified temperature and a specified ratio of SBS modified asphalt with a certain proportion of fillers, asphalt, mineral powder and fine aggregates are mixed to generate asphalt mortar, then coarse aggregates are mixed to mix a finished mixture, and the mixture is put into a mixer to be forcibly mixed. The novel polymer-mixed modified asphalt concrete is generated after uniform stirring, the asphalt content, the fine aggregate content, the mineral powder content (up to 25%) and the porosity are high, the porosity is small (less than 1%), the gaps are not communicated with each other, the following performance along with the deformation of the steel plate is good, the water tightness is good, the bonding with the steel plate is good, the ageing resistance is good, and the typical problem existing in the pavement of the steel bridge deck can be well solved. The structural layer is transported to the site by a transport vehicle, and a high-power paver with a vibratory rammer and an automatic leveling system is adopted for paving, so that the structural layer meets the use function requirement. The bonding layer is laid by using self-repairing type bonding emulsified asphalt, self-repairing bonding of an upper layer and a lower layer is realized, excellent deformation following performance is achieved, and cracking of the steel box girder caused by load deformation is prevented.