CN114908630A

CN114908630A - Factory road structure and secondary permanent-temporary combined layered construction method

Info

Publication number: CN114908630A
Application number: CN202210519727.5A
Authority: CN
Inventors: 张全鹏; 王金龙; 王琳; 李祥运; 许晓明; 李栋
Original assignee: Shandong Electric Power Engineering Consulting Institute Corp Ltd
Current assignee: Shandong Electric Power Engineering Consulting Institute Corp Ltd
Priority date: 2022-05-13
Filing date: 2022-05-13
Publication date: 2022-08-16

Abstract

The invention relates to the technical field of construction of factory roads and provides a factory road structure and a secondary permanent temporary combined layered construction method. This factory road structure includes: the cement-stabilized macadam comprises a brick slag cushion layer, a cement-stabilized macadam base layer, an asphalt permeable layer, a medium-grain asphalt concrete layer, a sticky layer and a fine-grain asphalt concrete layer which are sequentially laid from bottom to top; the brick slag cushion layer comprises a first layer of brick slag and a second layer of brick slag, and the maximum material diameter of materials in the first layer of brick slag is larger than that of materials in the second layer of brick slag; the cement stabilized macadam in the cement stabilized macadam base layer takes graded macadam as aggregate, adopts a certain amount of cementing materials and mortar volume to fill gaps of the aggregate, and is paved and compacted according to the embedding and extruding principle; the material of the asphalt permeable layer adopts grouting material or emulsified asphalt; the medium-grain asphalt concrete and the fine-grain asphalt concrete both adopt modified asphalt. The invention uses the brick slag material resources for building demolition to replace the relatively expensive rubble layer, thereby greatly saving the cost.

Description

Factory road structure and secondary permanent-temporary combined layered construction method

Technical Field

The invention relates to the technical field of construction of factory roads, in particular to a factory road structure and a secondary permanent temporary combined layered construction method.

Background

The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.

At present, the roads in the general contract project factory area are constructed in a permanent-temporary combination mode, and become a normalization, and the conventional implementation mode is that a concrete pavement is firstly constructed as a temporary construction road and an asphalt concrete pavement is finally constructed as a permanent road in the project construction process; the pre-construction concrete pavement structure comprises: the gravel layer, the water stabilization layer and the concrete layer are sequentially paved from bottom to top, and finally, the asphalt layer is paved on the concrete layer to form a permanent road. The construction method not only increases the cost of the concrete surface layer, but also increases the cost of secondary chiseling and repairing of the concrete road by the pipeline in the construction process.

Disclosure of Invention

In order to solve the problems, the invention provides a plant road structure and a secondary permanent temporary combined layered construction method, which optimize the road structure and realize solid waste utilization and greening environmental protection on the basis of meeting the design requirements.

In some embodiments, the following technical scheme is adopted:

in a first aspect, the present invention provides a factory floor roadway structure.

A factory floor roadway structure comprising: the cement-stabilized macadam comprises a brick slag cushion layer, a cement-stabilized macadam base layer, an asphalt permeable layer, a medium-grain asphalt concrete layer, a sticky layer and a fine-grain asphalt concrete layer which are sequentially laid from bottom to top;

the brick slag cushion layer comprises a first layer of brick slag and a second layer of brick slag, and the maximum material diameter of materials in the first layer of brick slag is larger than that of materials in the second layer of brick slag;

the cement stabilized macadam in the cement stabilized macadam base layer takes graded macadam as aggregate, adopts a certain amount of cementing materials and mortar volume to fill gaps of the aggregate, and is paved and compacted according to the embedding and extruding principle;

the material of the asphalt permeable layer adopts grouting material or emulsified asphalt;

the medium-grain asphalt concrete and the fine-grain asphalt concrete both adopt modified asphalt.

Further, the material specification of the asphalt permeable layer adopts PA-3 pore canal grouting material or PC-3 emulsified asphalt.

Further, the medium-grain asphalt concrete and the fine-grain asphalt concrete both adopt SBS-B modified asphalt.

Furthermore, the sticky layer adopts sticky layer oil, and the sticky layer oil adopts quick-cracking emulsified asphalt or medium-cracking emulsified asphalt or modified emulsified asphalt.

Furthermore, the brick slag cushion layer adopts brick slag resources when the building is dismantled.

In a second aspect, the present invention provides a factory floor roadway structure.

A secondary permanent-temporary combined layered construction method for a factory road comprises the following steps: the method comprises the following steps of (1) performing primary pouring and secondary pouring, wherein secondary permanent-temporary combined layered construction is formed between the primary pouring and the secondary pouring through an adhesive layer;

the first pouring comprises: after the pavement of the road base layer is finished, paving a brick slag cushion layer; when the compaction quality of the brick slag cushion layer meets the set requirement, paving a cement stabilized macadam base layer; paving, compacting, seam processing and maintaining the cement stabilized macadam base layer in sequence, and then paving an asphalt permeable layer; paving, compacting, seam processing and inspection well position processing on the asphalt permeable layer, and then paving a medium-grain asphalt concrete layer;

the second pouring comprises: and paving a fine particle type asphalt concrete layer after paving the adhesive layer on the surface of the medium particle type asphalt concrete layer.

Further, the construction method of the brick slag cushion layer comprises the steps of leveling the bottom of the groove, backfilling a first layer of brick slag, and rolling by adopting a compaction machine until a first compaction quality standard is achieved; and backfilling a second layer of brick slag, adding medium coarse sand, and rolling by using a compacting machine again until a second compacting quality standard is reached.

Furthermore, the first compaction quality standard and the second compaction quality standard are both controlled by rolling passes, and the rolling passes are obtained by determining the number of passes required when the compaction machine rolls to be compact according to the relation between the rolling passes and the degree of compaction of the compaction machine.

Further, concrete process that cement stabilized macadam basic unit was in proper order paved, compaction, seam processing, maintenance includes:

paving: a cross slope instrument is adopted to control the slope, a spiral distributor of the paver keeps rotating at a speed according to the paving speed, and the two sides of the paver keep a mixture with the height not less than 2/3 of a feeder;

compacting: the rolling direction is parallel to the central line of the road, the straight line section is from the side to the center, the super high section is from the inner side to the outer side, the rolling is continuously and uniformly carried out in sequence, and the rolling needs to exceed the joint of the two sections each time;

seam treatment: the longitudinal joint cutting seam is vertical and smooth, and sundries of the cutting seam are cleaned; vertically cutting the transverse joints to be uniform before construction, cleaning cutting seams and removing cutting seam materials;

and (5) maintenance: wetting the permeable non-woven geotextile, and then covering the top surface of the rolled structural layer; after covering, sprinkling water by using a sprinkling nozzle.

Further, the process of paving, compacting, seam processing and inspection well position processing of the asphalt permeable layer comprises the following steps:

paving: cleaning, repairing and treating the lower bearing layer, and before paving the asphalt mixture, spraying a layer of viscous layer oil on the lower bearing layer, the transverse joint interface, the kerb contacted with the newly paved asphalt mixture, the rainwater inlet and the side surface of the inspection well; spreading by a spreading machine;

compacting: according to the set rolling route and the rolling times, the paved surface reaches the specified compaction degree in a short time;

seam treatment: the longitudinal joint of the echelon operation is adopted as the hot joint during paving; when the thermal joint can not be adopted in the half-width construction, the cutting knife is adopted for cutting the steel plate evenly;

well position treatment of the inspection well: marking the center of the well by using a cross line outside the paved road; dismantling a walling crib; cleaning the chiseled well mouth part, building the chiseled well mouth part to a specified height by cement mortar and bricks, hanging down a steel plate which is processed and manufactured in advance, covering the well mouth, and starting to pave asphalt concrete; paving and rolling asphalt concrete on each layer to a specified thickness, finding out the position of a well mouth according to the preset positioning, and chiseling off the asphalt concrete of a well ring by using a steel chisel; lifting out the steel plates, cleaning the well ring, bricking to the height level with each layer of asphalt concrete, and putting down the steel plates; after paving is finished, chiseling and cleaning the asphalt concrete on the top layer, lifting and leveling the well ring to be horizontal to the asphalt concrete pavement by matching a crane, pouring concrete around 10-20cm, and compacting.

Compared with the prior art, the invention has the beneficial effects that:

(1) according to the invention, the building demolition brick slag material resource which meets the design requirement and is low in price is used for replacing a relatively high-price crushed stone layer, the waste of the waste brick slag is utilized, the waste is changed into valuable, and meanwhile, the ground material is saved, so that the cost is greatly saved, the economic benefit is brought, and meanwhile, the great social environmental protection benefit is created.

(2) The invention adopts the brick slag material resources removed from the local building to replace broken stones as the road cushion layer, cancels the concrete layer, realizes solid waste utilization, greens and protects the environment, creates a new process on meeting the design and use requirements, and reduces the cost.

(3) On the basis of meeting the design and use requirements, the invention realizes the secondary permanent temporary combination of roads, reduces the cost by about 200 ten thousand yuan, and realizes cost reduction and efficiency improvement.

Additional features and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

FIG. 1 is a first schematic sectional view of a factory floor road structure according to an embodiment of the present invention;

FIG. 2 is a schematic sectional view of a factory floor road structure according to an embodiment of the invention;

FIG. 3 is a general construction flow diagram in an embodiment of the present invention;

FIG. 4 is a flow chart of layered construction according to an embodiment of the present invention.

Detailed Description

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

Example one

In one or more embodiments, a factory floor roadway structure is disclosed, comprising: the brick slag cushion layer, the cement stabilized macadam base layer, the asphalt permeable layer, the medium particle type asphalt concrete layer, the sticky layer and the fine particle type asphalt concrete layer are laid in sequence from bottom to top;

The brick slag cushion layer has the main functions: the load stress is diffused and the water temperature condition of the roadbed is improved, so that the strength, rigidity and stability of the surface layer and the base layer are not influenced by the change of the water temperature condition of the soil foundation, water resistance, drainage and freeze prevention are realized, and the working conditions of the base layer and the soil foundation can be improved.

The cement stabilized macadam base has the main functions of: the cement stabilized macadam takes graded macadam as aggregate, adopts a certain amount of cementing materials and enough mortar volume to fill the gap of the aggregate, and is paved and compacted according to the embedding and extruding principle. The compactness of the mortar is close to the compactness, the strength mainly depends on the embedding, extruding and locking principles among the gravels, and simultaneously, the mortar has enough volume to fill the gaps of the aggregate. Its initial strength is high, and its strength can be quickly increased with age, and can be quickly formed into plate body, so that it has high strength, and good impermeability and frost resistance. The dosage of the water-stable cement is generally 3% -6% of the mixture, the unconfined compressive strength of 7 days can reach 1.5-4.0 mpa, and the cement is higher than other roadbed materials. After water is stable and survived, the water is not muddy when meeting rain and has a solid surface, thus being an ideal base material for high-grade pavements.

The asphalt permeable layer has the main functions: the road weighing device bears the driving load, and the load of the wheels is transmitted to a lower mechanism together as a main weighing layer and a surface layer of the road; the overall strength of the road and the fatigue resistance of the surface layer are increased, and cracks of the surface layer are prevented or reduced; the adverse effect of uneven frost heaving or uneven volume deformation of the soil foundation on the surface layer can be relieved; and a stable running surface and a stable working surface are provided for the surface layer construction machinery.

1. Asphalt concrete surface course

1) The asphalt of the asphalt concrete adopts SBS-B type finished product modified asphalt, the matrix asphalt for preparing the modified asphalt has good compatibility with a modifier, and the quality of the matrix asphalt meets the technical requirement of the asphalt for the A-grade road. The stone used for the asphalt surface layer is anti-sliding and wear-resistant stone, the stone polishing value is more than 42, and the anti-sliding standard of the asphalt pavement is as follows: the transverse force coefficient is more than or equal to 54, the construction depth is more than or equal to 0.55, and the swing value is more than or equal to 58; the compaction degree of the asphalt mixture should reach 95%.

2) Type of asphalt pavement: an upper layer AC-13; the following layers: and (6) AC-16.

3) Allowable deflection value of road surface: 581/100 mm.

4) The classification of stone material grades, the quality requirements of broken stones, sand, stone chips and mineral powder, the particle size specification of broken stones, the technical standard of asphalt, the construction climate subarea of asphalt pavement, different zones, the selection of asphalt labels of different asphalt surface layers, the grading composition of asphalt mixture, the proportioning calculation example, the construction method, the quality management and acceptance standard, the technical standard of asphalt concrete and the like are all executed according to the relevant regulations of the road asphalt pavement construction technical specification (JTG F40-2004).

2. Adhesive layer

The side face between upper and lower surface layers and the side face of the structure of curb stone etc. contacting with newly laid asphalt mixture must be sprayed with adhesive layer oil, the adhesive layer oil should be quick-cracked or middle-cracked emulsified asphalt, modified emulsified asphalt, its quality and specification should meet the requirements of the standard, the used matrix asphalt should be identical to the main layer asphalt mixture in grade.

The sprayed oil must be in uniform mist shape, and can be uniformly formed into a thin layer in the whole width of the road surface, and no leakage, strip or accumulation can be caused. If the spraying is insufficient, the spraying is supplemented, and the spraying excess part is scraped. After the viscous layer oil is sprayed, other vehicles and pedestrians outside the material transporting vehicle are forbidden to pass through. The adhesive layer oil is sprayed on the same day, and after emulsion breaking and water evaporation are completed or the diluent in the diluted asphalt is basically volatilized, the adhesive layer is paved next to the paving surface layer to ensure that the adhesive layer is not polluted.

3. Asphalt permeable layer

The specification of the asphalt permeable layer material is PA-3(PC-3), and the dosage is 1.0L per square meter.

4. Cement stabilized macadam base

The compaction degree of the cement stabilized macadam base is more than or equal to 0.97 (heavy compaction standard), 42.5-grade cement, and the compressive strength is more than or equal to 3.0MPa (7d, wet-curing at 25 ℃ for 6d, soaking for 1d, and age-based unconfined compressive strength). The maximum particle size of the broken stone is not more than 30mm, the particle composition is preferably graded, and the broken stone does not contain impurities.

The requirements of compression strength of cement stabilized macadam (gravel), control of cement dosage, grading composition range of aggregate, design steps of mixture, construction season, construction method, quality management and acceptance criteria and the like are all executed according to relevant regulations of highway pavement basic course construction technical rules (JTG/T F20-2015).

5. Brick slag cushion layer

The strength of the brick slag is not lower than 15MPa, the maximum grain diameter is not more than 15cm, the mud content is not more than 12%, and the brick slag does not contain garbage, wood materials, organic matters and the like. During construction, the discharge is dense and stable, the upper layer is caulked by fine aggregate, the surface is solid and flat, and phenomena such as pumice, concentration of coarse and fine aggregate and the like cannot occur.

6. The minimum strength and compactness requirements of the roadbed filling are as follows: should not be less than the specification of table 1.

Table 1 roadbed filling minimum strength and compaction requirements (heavy compaction standard)

In the subgrade base range, measures such as interception, drainage and the like are adopted when the subgrade stability is influenced by surface water or underground water; before roadbed filling, the original road structure layer is excavated and broken, and compacted before filling, the compaction degree meets the requirement of table 1, and when sludge is excavated, filling replacement measures are taken.

The resilience modulus of the soil foundation on the bottom surface of the roadbed is not less than 30MPa, and measures are taken when the requirement cannot be met, so that the strength of the soil foundation is improved.

Example two

The embodiment relates to a secondary permanent-temporary combined layered construction method for a factory road.

the first pouring comprises the following steps: after the pavement of the road base layer is finished, paving a brick slag cushion layer; when the compaction quality of the brick slag cushion layer meets the set requirement, paving a cement stabilized macadam base layer; paving, compacting, seam processing and maintaining the cement stabilized macadam base layer in sequence, and then paving an asphalt permeable layer; paving, compacting, joint processing and inspection well position processing on the asphalt permeable layer, and then paving a medium-grain asphalt concrete layer;

The specific scheme of this embodiment can be implemented with reference to the following contents:

(I) construction sequence

The overall process is as follows: measuring and paying-off → road bed earthwork excavation → watering compaction → brick slag replacement and filling → compaction → rainwater pipe, rainwater well, drainage well, road pipe penetrating construction → water stabilization layer construction → compaction → maintenance → curb installation → road surface cleaning → permeable layer oil, viscous layer oil → paving AC-16C → road roller compaction → permeable layer oil, viscous layer oil → paving AC-13C → rainwater port cover plate installation → inspection, acceptance → cleaning site and traffic opening.

(II) preparation for construction

Technical preparation:

1. the design drawings are reviewed and familiar with relevant information. Checking whether the drawings are complete or not, whether the drawings have errors or contradictions or not, whether the design content is consistent with the construction conditions or not, whether the problems exist in the lap joint matching among various types of work or not and the like. At the same time, the design data, structural features, soil layer, geology, hydrology, and construction period requirements should be familiar with.

2. And (4) finishing the meeting of drawings and the design of construction drawings, and familiarizing the design content and the technical specification.

3. Coordinates and elevations are checked.

4. Compiling a construction scheme, finishing scheme review, start work review and finishing technical safety settlement.

Preparing on site:

1. and finishing positioning and paying off.

2. Preparing construction machinery and machines, and performing maintenance and test run work on the existing mechanical machines; and ordering and leasing the lacking mechanical machines and tools.

3. And (4) preparation of supply of construction materials, and planning of the quantity of required construction materials and arrangement of goods sources.

4. Completing the preparation of entering the field of professional construction team

[ III ] Measure paying-off

1. Before the roadbed is worked, the measuring team firstly carries out roadbed retest work. The content comprises wire points, a central line, retesting of the level points, cross section inspection and reconnaissance, addition of the level points, the wire points and the like. The precision of construction measurement meets the requirements of design and specification.

2. Construction measurement: the elevation measurement adopts a level gauge for measurement; and the wire lofting adopts a total station and a GPS to measure. The leveling measurement adopts double-person double-machine independent measurement or single-person single-machine reciprocating measurement, and the double-check signature verification of the measurement is realized, so that the measurement error is avoided. The leveling grade is four, and the wire grade is one grade.

3. Measuring method

1) Conducting wire point, level point retest and joint test:

and (4) carrying out retesting on the lead control point and the elevation datum point by using a GPS (global positioning system), a total station and an automatic leveling instrument. And checking the coordinates of each lead point and the elevation of the leveling point according to the measurement precision requirement of the technical specification. After re-checking, the data can be used as the basis for recovering alignment measurement.

2) And (3) control point recovery and encryption:

and recovering and reinforcing the control points subjected to retesting and joint surveying, encrypting and laying the wire control points and the elevation control piles according to the precision requirements of the first-level wires and the fourth-level wires, wherein the adjacent wire points have good visibility and are not disturbed by the outside, and after the control points are laid, arranging the measurement results and reporting, reviewing and checking.

3) Measuring and paying off:

and recovering the roadbed center line by adopting a total station or a GPS. And releasing the subgrade side line according to the design drawing size and the construction specification requirement. And marking and reinforcing the red line boundary pile by using an obvious mark, and retesting the original ground.

4) And (3) measuring the process:

in the construction process, the middle pile and the side line of each construction layer of the filling section are recovered, the error in the filling process is corrected, and the filling compaction of the side slope is ensured to be in place; measuring the elevations of piles and side piles in the roadbed, ensuring the uniform filling thickness and meeting the requirements of longitudinal and transverse slopes of the roadbed; when the pipe ditch is constructed, the axis of the pipe ditch is tracked, measured and checked.

5) The related requirements are as follows:

the construction layout meets the design drawing and the current standard requirement.

[ FOUR ] roadbed construction

1. Site cleaning

1) Before construction, according to the coordinates of the middle pile and the coordinates of the occupied land line, the middle pile and the occupied land pile are set according to a design drawing, the distance between the piles is 20 meters, the curve is encrypted to 10 meters, the slope toe line is set by a ruler amount or the total station, and the number of the middle pile is marked by red paint. And measuring the original ground elevations of the middle line and the slope toe by using a leveling instrument, recording, drawing a cross section diagram, comparing with the original design, and clearing the surface for construction.

2) And connecting adjacent ground occupying piles by using white lime to form a ground occupying boundary. The garbage, organic residue and humus on the surface of the original ground of the soil pit, turf and root and surface soil of crops are removed from the roadbed.

2. Subgrade excavation

In the embodiment, a transverse excavation method is adopted, and the whole cross section is gradually excavated forwards from one end or two ends or a layer of transverse full width excavation according to the width and the depth of the roadbed.

During earth excavation, a measurer measures the elevation of the roadbed to prevent over excavation, and an original soil layer of 30cm (different soil quality sections are determined by tests) is reserved on the excavated roadbed by considering the subsidence of the roadbed caused by compaction. The compaction degree of 300mm below the top surface of the road bed is not less than 96 percent. And after the compactness detection meets the requirement, leveling to the designed elevation of the road bed by using a land leveler or a bulldozer.

3. Roadbed fill

And (4) discharging side pile points by using a total station and a level gauge by adopting an asymptotic method, wherein the connection line of the side pile points is the roadbed filling sideline. And the construction team reinforces and protects the soil filling sideline pile and makes a striking mark. And when the side line of the filled soil is determined, widening 50cm on each side of the roadbed according to the design width so as to ensure that the side line of the roadbed construction can meet the requirement of roadbed compactness. The side stakes are one per 20 meters and the curve is encrypted to 10 meters. Nailing with bamboo rod, and writing pile number mark on each section.

The construction is carried out according to the process flow of test, filling and detection.

Strictly executing the technical specification of the highway, filling and rolling in layers, paving by adopting a bulldozer, leveling by a land leveler, rolling by a heavy road roller, and detecting the compactness by a ring cutter method.

The roadbed filling construction process and technical parameters are determined through tests on the test section, and roadbed filling construction is organized according to results of the test section.

The method is characterized in that a 12T vibratory roller is adopted for rolling, and the rolling is carried out according to a method of evenly compacting with light weight first and heavy weight second, slow speed first and fast speed second, edge first and middle second. In the rolling process, the walking speed of the road roller is controlled to be about 3km/h (not more than 4 km/h). And (3) firstly carrying out static pressure once by using a 20T road roller, carrying out vibration pressing once by using 1/3 wheel traces after the static pressure is finished, then carrying out vibration pressing once by using a 1/2 wheel trace by using the 20T road roller, after the third time of rolling is finished, carrying out light rolling once by using a 25T road roller and carrying out compaction degree detection, at least 2 points are detected per 1000 square meters, and entering the roadbed filling construction of the next layer after the spot check is qualified.

The surface layer of the top surface of the roadbed is renovated, the compacted thickness of a soil layer to be filled is not less than 100mm, and the surface is smooth after compaction without loosening and peeling. And smooth drainage of the top surface of the roadbed is ensured.

And (4) removing loose or semi-buried stones with the size larger than 100mm from the surface layer of the roadbed, and filling soil, leveling and compacting the stones, wherein the thickness of the finished surface layer of the roadbed is less than 150 mm.

And (3) finishing each project of the roadbed before reworking by making a drainage facility for the roadbed which is shut down for a long time in midway and does not make a road surface temporarily. After the roadbed is renovated, all the waste soil piled in the roadbed range is removed.

[ V ] brick slag replacement and filling

The filling thickness is 50 cm. Compacting and filling in two layers. Because the soil base has large water content and is wet and soft, the first layer is preferably backfilled by 30cm in thickness, the second layer is backfilled by 20cm, and compaction is carried out by using a compaction machine after each backfilling.

1. Material quality requirement

The brick slag is derived from construction waste and contains more impurities, and before the brick slag is used, the construction waste needs to be screened so as to meet the road quality requirement. The method comprises the following specific steps: the method comprises the steps of removing soft or corrosive materials such as wood, plastic strips and blocks, waste materials, weeds, tree roots and cloth strips; the brick slag and the concrete blocks are manually crushed and processed to be used as materials of a lower layer, the particle size can be slightly larger, and the maximum material diameter is not more than 15 cm; and the maximum material diameter of the upper layer material is not more than 10cm, so that gap filling and rolling compaction are facilitated.

2. Construction process

The groove bottom of the leveling groove is leveled, accumulated water and other sundries are cleaned

And the brick slag is backfilled, the excavator is leveled without processes of mixing, adding water and the like, the brick slag can be directly leveled and then rolled twice by the excavator, and then rolled and compacted by a 12-15T road roller. The construction process of the structural layer is simple and convenient, and is easy to master and operate. However, care must be taken during compaction that the excess pressure cannot be exceeded, and that a too heavy compaction machine is not used to crush the brick slag, and that it is not feasible to use a vibratory roller to roll.

And when the second layer of brick slag is backfilled, 15-20% of medium coarse sand can be doped into the brick slag, so that gaps can be filled, the compactness of the structural layer is increased, and the aim of improving the later-stage integral strength can be fulfilled.

3. Compaction quality control

Because the brick slag material contains building materials such as concrete blocks, sand and the like, and the proportion is not fixed, the uniformity is poor, and the maximum dry unit weight of the mixture can not be determined by a conventional test method to measure the compaction quality of the mixture. In engineering construction, an indirect control method may be employed.

1) Surface sedimentation method (advantage: construction speed is fast)

After the brick slag is filled, laid and stabilized, measuring points are arranged every 5m on the surface, and paint is coated to make colored marks. And measuring the elevations of each point after each rolling by using a leveling instrument. Until the elevation no longer decreased, the compaction density was considered to meet compaction standards, and table 2 is the empirical settlement for different compaction passes (specific parameters were based on field trials).

TABLE 2 empirical sedimentation for different rolling passes

Number of passes	1	2	3	4	5
						Sedimentation quantity (mm)	14	4	2.5	1.5	1

And (4) compacting by a pass method. According to different parameters of the compactor, the relationship between the rolling times and the compaction degree of various compaction machines is found out through an experimental section, the times required when various road rollers are rolled to be compact are determined, and the compaction quality is controlled according to the rolling times.

2) The spring-back deflection method (disadvantage: construction speed is slow)

Firstly, a test section is made, the rebound deflection value after each rolling is measured, and a relation curve of compactness and deflection value is found out. Compaction is considered to have been rolled when the deflection value is unchanged or changes very little.

And then, referring to the parameters of the test section, and performing subsequent construction.

(VI) construction of cement stabilized macadam foundation

1. Preparing a lower bearing layer

The surface of the subbase layer is thoroughly cleaned, the floating soil, various impurities and scattered materials are removed, and the surface is kept clean. The cement paste is sprayed on the top surface of the subbase layer within 2 hours before paving, and preferably not less than (1.0-1.5) kg per square meter of cement by mass. When the stabilized macadam is paved, the surface of the lower bearing layer is ensured to be wet.

2. Measuring line

The method comprises the steps of re-checking a wire point coordinate and a leveling point elevation.

Recovering the midline and the sideline and well protecting:

firstly, drilling steel rods on straight line segments at intervals of 10m (every 5m on a flat curve), calculating loose pavement elevation according to the determined loose pavement coefficient, and hanging guide control steel wires, wherein the deflection of the steel wires between two adjacent steel rods is not more than 1 mm. The elevation and the cross slope are controlled by the reference steel wires on two sides of each section, and the elevation and the cross slope are controlled by the movable aluminum alloy frame between the spreading machines.

Secondly, the paving sideline of the base layer is discharged and marked by a white gray line to ensure that the paving width and the sideline are smooth and straight.

3. Mixing of

The method has the advantages that centralized plant mixing is adopted, the condition of a mixing plant mixing machine is checked before mixing, and good performance of construction machinery is guaranteed.

And field test personnel adjust the feeding quantity of the raw materials according to the water content and the mixing proportion of the raw materials, so that the water content in the mixture is slightly larger than the optimal water content by about 2 percent. The mixing uniformity of the mixed material is visually observed, so that the mixed material leaving the factory has uniform color and no segregation phenomenon.

And thirdly, special arrangement personnel at the background check the gradation composition, the water content of the mixture and the cement dosage at any time, so that the construction quality is ensured.

And the mixing water consumption of the mixture is controlled by the optimal water content (1% -2%), so that the surface of the mixture is kept moist after the mixture is rolled and formed. The high-temperature evaporation amount in summer is large, the water content in the morning and at night is different from that in the noon, and the adjustment is carried out in time according to the temperature change, but the water adding amount does not exceed the optimal water content by plus 2 percent.

The discharging of the mixer does not allow the free-falling method of grounding pile forming and loading and transporting of the loader to be adopted. A storage hopper with a valve hopper is required to be equipped, finished mixture is firstly loaded into the storage hopper and is discharged by the hopper, loaded and transported.

Sixthly, arranging a special person to record the time when the vehicle leaves the factory and used for controlling the construction time.

And keeping contact with the foreground by the mixing responsible person, and reporting the operation condition of the background at any time so that the foreground can take related preventive measures in time.

4. Transportation of

The loading method has the advantages that in order to reduce the separation phenomenon of the mixed materials, the dump truck needs to move front and back during loading, loading is carried out for three times, and the separation of the mixed materials is avoided.

And the completeness of the vehicle is checked before charging, the number of the dump trucks is reasonably configured according to the production capacity of a mixer and the spreading capacity of a forecourt, and the continuous construction is ensured due to slight surplus. The carriage of the dumper should be cleaned before loading.

And thirdly, the transport vehicle adopts tarpaulin covering measures to prevent the water of the mixture from being lost.

Fourth, when loading and unloading, the transport vehicle must be instructed by a field manager and driven according to a prescribed route and speed.

5. Paving machine

The method has the advantages that the surface of the operation surface is ensured to be free of floating soil, accumulated water and the like before construction, and the surface of the operation surface is watered and kept moist. Before the base layer is paved, the lower bearing layer is sprayed with water to be wet.

The operation conditions of all parts of the paver are checked before paving, the surface of the subbase layer is properly sprayed with water, moistened and sprayed with cement slurry, the cement mass is preferably not less than (1.0-1.5) kg/square meter of cement, and the loose paving coefficient is accurate to 1.36 of the result obtained according to the test section. And (4) on site, a specially-assigned person is set to measure the loose paving thickness of the mixture, wherein the loose paving thickness is 24.5 cm.

And thirdly, the relation between the sensor arm and the guide control line is adjusted, the thickness and the elevation of the base layer are strictly controlled, and the transverse gradient of the road arch is ensured to meet the design requirement.

The paver is suitable for continuous paving, the feeding capacity and the transport capacity are matched with the paving speed, and more than 3 material transporting vehicles are kept waiting for unloading. And 4-5 trolleys are paved on the site, the lowest speed is selected for paving, the paver is forbidden to stop for waiting for the paving, and the paving speed of the paver is preferably controlled to be about 1.0-3.0 m/min.

The material transporting vehicle is parked at the position 20-30 cm in front of the paver, the paver is prevented from colliding, the discharging vehicle is pushed upwards by the paver, the material is discharged while advancing, and the discharging speed is coordinated with the paving speed.

Sixthly, in the paving process, controlling the gradient by using a transverse slope instrument.

When the mixture of the base course is paved by adopting two pavers to form a ladder-line, the front-rear distance between the two pavers is preferably controlled to be 5-10 m, and the machine type, the paving speed, the paving thickness, the loose paving coefficient, the road arch slope, the paving flatness, the vibration frequency and the like of the mixture are consistent. The paving seams of the two machines are smooth, the paving width of one paver is not more than 1/2 of the width of the roadbed, and the two overlapping positions are suitable for avoiding the wheel track belt of the lane. The latter spreading machine and the former spreading machine should have an overlapping spreading width of about 10-20cm, and roll together from front to back. When one paver is adopted for operation, the half-width paving length is not more than 80 meters according to the paving speed (2-6m/min), the other half-width paving is required to be immediately paved, the exposure time of the base layer mixture is reduced, and the water evaporation capacity is reduced.

And the spiral distributor of the spreading machine rotates uniformly at a stable speed according to the spreading speed, and the mixture with the height not less than the height of the feeder 2/3 is kept on two sides so as to reduce the segregation in the spreading process.

The self-supporting paver should be provided with a special person behind to eliminate segregation of coarse and fine aggregates, and particularly should shovel off local coarse aggregate pits and fill the pits with a newly mixed mixture.

6. Compacting

And (5) rolling after being paved for about 50-80 m. The rolling must follow the principles of "light first then heavy, slow first then fast, quiet first then vibration, edge first then medium, low first then high".

The rolling direction is parallel to the central line of the road, the straight line section is from the side to the middle, the super high section is from the inner side to the outer side, the rolling is continuously and uniformly performed in sequence, and the rolling direction must exceed the joint of the two sections each time.

Initial pressing: the steel wheel road roller runs 2 times of static pressure following the steps of the paver, and is vibrated 1 time and 3 times strongly. The speed per hour is 1.5 km/h-1.7 km/h, the one-time rolling length is generally 50 m-80 m, and the staggered wheels are overlapped 1/2 when the road roller rolls.

Repressing: the rubber-tyred roller rolls for 2 times at the speed of 1.8 km/h-2.2 km/h, and the overlapping width of the roller meets the requirement during rolling, so that no less pressure or pressure leakage is ensured.

Final pressure: the static pressure of the roller is 1 time, the speed per hour is 1.8 km/h-2.2 km/h, and the staggered wheels of the roller are 1/2 overlapped when the roller rolls.

In the rolling process, the surface of the cement gravel is kept wet all the time, and if the water is evaporated too fast, a small amount of water is timely added.

In the rolling process, if the phenomena of 'spring', looseness, peeling and the like exist, the mixed material needs to be opened or replaced by new mixed material in time so as to meet the quality requirement.

And (3) after the rolling is finished, detecting the compaction degree in time by using a sand filling method, compensating the pressure in time within the cement final setting time which does not meet the requirement, backfilling the pit holes subjected to the compaction degree detection by using the sand filling method by using cement stabilized macadam of the same material in time, and tamping by using an iron hammer.

The road roller is strictly prohibited from turning around or suddenly braking on a finished or rolling road section, and the surface layer of the cement stabilized macadam is guaranteed not to be damaged.

The rolling is preferably finished within 2h, the required compactness is achieved, and no obvious wheel tracks exist. And after the self-inspection is qualified, reporting to a supervision engineer for approval, and after the supervision engineer performs the random inspection, performing the next procedure construction.

In the rolling process, a special person is required to detect the compaction degree, elevation, width, transverse gradient and flatness.

7. Seam treatment

During construction, the seam is processed, the longitudinal seam is perpendicular and smooth, sundries of the seam are cleaned up, cement paste is sprayed once before paving if necessary, the original water stability is used as an elevation reference surface during paving, a paver is adjusted to a loosening height, the paver extends to the original water stability surface by 5-10cm, a specially-assigned person is dispatched to produce redundant aggregate, the redundant aggregate is uniformly spread on a new water stability surface, the road roller is firstly on the original water stability surface during rolling and then gradually transversely moves towards the new pavement according to the width of 15-20cm, and when slab staggering and more aggregates are found, fine materials are manually removed or spread in time. And vertically cutting the transverse joints to be uniform before construction, cleaning the cut seams, and removing the cut seam materials by the same method as the longitudinal seams.

8. Health preserving

And immediately carrying out quality inspection after each section of rolling is finished, and starting the curing operation.

The method comprises the steps of wetting the non-woven permeable geotextile and then manually covering the top surface of the rolled structural layer. After covering, spraying water by using a water spraying nozzle, and normally maintaining within 7 days. The shower nozzle needs the atomizing, must not use high-pressure type spray tube to avoid destroying basic unit's structure, the number of times of watering should be decided according to the weather every day, should keep cement throughout during the whole health preserving to stabilize the gravel layer surface moist.

And a specially-assigned person is arranged to carry out traffic control on the health-preserving road section during the health preservation, and the vehicle is strictly prohibited from running.

9. Job site inspection

The method comprises the steps of checking whether rolling meets requirements or not, and detecting items: frequency;

checking whether the loose pavement thickness meets the design requirement;

thirdly, checking the flatness of the paving and making a record;

fourthly, checking the grading of the water-stable mixture, the water content, the cement dosage and no lateral limit for 7 days;

fifthly, after the health preserving period is finished, coring, and checking whether the water-stable macadam is formed;

[ HEV ] construction of asphalt concrete surface course

1. Asphalt concrete pavement construction flow chart

The overall construction process is shown in FIG. 3, and the layered construction process is shown in FIG. 4.

2. Preparation for construction

The method comprises the steps of conducting investigation tests on various materials before construction, wherein the selected and determined materials are stable in the construction process and cannot be changed randomly.

The construction method has the advantages that various construction machines are comprehensively inspected before construction, the construction machines are in a good-performance state through debugging, the number of machines is enough, the construction capacity is matched, and standby equipment is suitable for important machines.

3. Design of mix proportion

The method comprises the steps of calculating the consumption proportion of various materials by using materials actually used in engineering, matching the consumption proportion into mineral aggregate gradation meeting the requirements of design and specification, performing Marshall test, and determining the optimal asphalt consumption. The mineral aggregate gradation and the asphalt dosage are used as target mixing proportion, and the mixer determines the feeding proportion, the feeding speed and the trial mixing use of each cold storage bin.

And sampling and screening the materials entering the hot material bins after secondary screening to determine the material proportion of each hot material bin for a control room of the mixer. And meanwhile, the feeding proportion of the cold material bin is repeatedly adjusted to achieve balanced feeding, and the optimal asphalt using amount of the production mixing proportion is determined.

And the design standard mix proportion cannot be changed randomly in the construction process. In the production process, if the entering materials are changed and the mineral aggregate gradation and Marshall technical indexes of the asphalt mixture do not meet requirements through detection, the mixing proportion is adjusted in time to ensure that the quality of the asphalt mixture meets the requirements and keeps relatively stable, and the mixing proportion design is carried out again when necessary.

4. Mixing of asphalt mixture

The hot-mix asphalt mixture can be mixed by an intermittent mixer, and the mixer has sealing performance for preventing mineral powder from flying and scattering and dust removal equipment and a device for detecting mixing temperature.

And the asphalt material is heated by adopting heat-conducting oil.

And thirdly, the mixing time of the asphalt mixture is determined by the condition that the mixture is uniformly mixed and all the mineral aggregate particles are completely coated with the asphalt binder through test mixing.

The asphalt mixture blended by the blending plant is uniform and consistent, free of white materials, agglomeration and blocking or serious coarse and fine material separation phenomena, incapable of meeting the requirements, and timely adjusted.

5. Transportation of SBS modified asphalt mixture

The method comprises the steps of calculating the number of vehicles according to the production capacities and the transport distances of a mixing plant and a paver, ensuring that 4-5 vehicles to be unloaded are always preserved in the front of the paver during paving, and ensuring that the transport capacity meets requirements by adopting large-tonnage transport vehicles.

The vehicle performance is overhauled before transportation, and the transportation vehicle with good use performance is used for preventing the vehicle from being damaged in the material transportation process.

The carriage of the transport vehicle is cleaned, the oil-water mixture is washed, and the carriage is strictly forbidden to have silt or other impurities left; in order to prevent the asphalt mixture from being bonded with the carriage plate, coating 1 on the side plate and the bottom of the carriage: 3, diesel oil-water mixed liquor.

In the charging process, in order to reduce coarse and fine particle segregation of the asphalt mixture, the charging distance from the discharge port to the carriage is shortened, a bucket of materials is filled into the carriage, and the vehicle moves once.

And fifthly, the material transporting vehicle should use up a good double-layer tarpaulin covering facility regardless of wind blowing and rain falling so as to be convenient for heat preservation and rain prevention or avoid environmental pollution.

Sixthly, the material transporting vehicle cannot stop at will in the material transporting process, and the material transporting vehicle travels at a constant speed as much as possible, so that sudden acceleration and sudden braking are avoided.

And a digital display plug-in thermocouple thermometer is adopted to detect the leaving temperature and the transporting temperature of the asphalt mixture to the site, the insertion depth is more than 150mm, a special detection hole is arranged in the middle of the side surface of the material transporting vehicle, and the distance between the hole opening and the bottom surface of the carriage is about 300mm.

And the material is collected by a material conveying sheet on a paving site, the quality of the asphalt mixture is checked, whether the color of the mixture is consistent, whether the mixture has a white material, whether the mixture has agglomeration or serious segregation phenomenon, and whether the temperature is within an allowable range are checked. If the temperature of the mix is too high or too low, it should be discarded, as well as the mix that has caked or exposed to rain.

6. Paving of SBS modified asphalt mixture

1) The cleaning, repairing and treating of the lower bearing layer are extremely important tasks and must be considered. The work should be completed 1 day before paving and confirmed by acceptance. The concrete requirements are as follows

The method comprises the following steps of thoroughly cleaning and washing pollutants, mortar and other scum of a lower bearing layer by using a steel brush. 2) The pit, the loose and other diseases of the lower bearing layer are repaired by asphalt mixture according to the regulations.

Secondly, the elevation, the cross slope and the flatness of the lower bearing layer are detected, and the defect sections which influence the quality and cannot be eliminated on the upper layer are leveled.

2) And spreading viscous layer oil. In order to ensure that the upper surface layer and the lower bearing layer are bonded completely, before paving the asphalt mixture, a layer of viscous layer oil is sprayed on the lower bearing layer, the transverse joint interface, the side surfaces of the kerbstone, the rainwater inlet, the inspection well and the like which are in contact with the newly paved asphalt mixture. The quality control points are as follows

Firstly, the quality of the viscous layer oil should meet the standard requirement;

secondly, the using amount of the adhesive layer oil is controlled to be 0.3-0.4 kg/m2, the adhesive layer oil is uniformly sprayed, and the local areas with little or more spraying are manually supplemented or scraped;

thirdly, dirt and dust on the road surface should be removed. When sticky soil blocks exist, water is used for brushing, and the soil blocks are poured after the surface is dried;

fourthly, when the temperature is lower than 10 ℃ or the road surface is wet, the asphalt with the sticky layer cannot be sprayed;

fifthly, the adhesion layer asphalt is ensured to be emulsified before paving, and is ensured not to be polluted after water evaporation is finished.

3) Paving machine

The spreading temperature is not lower than 160 ℃.

Secondly, before paving, the paver should be adjusted to the optimal state, the automatic material level devices at two ends of the spiral material distributor are well adjusted, and the rotating speeds of a material door switch and a chain plate feeder are matched. The material quantity of spiral distributing device is with the center that is a little higher than spiral distributing device as the degree, makes the striker plate front and back mixture evenly distributed at full width within range of ironing board, avoids paving and appearing segregation phenomenon to whether analysis, adjustment thickness are gathered materials evenly at any time, whether detect the loose thickness and accord with the regulation, so that carry out above-mentioned each item adjustment at any time. Before the mixture is paved, the ironing plate is preheated (the temperature is not lower than 85 ℃), and the ironing plate of the paver must be tightly spliced without gaps, so that the phenomenon that the pavement is pulled out of streaks due to material blocking is avoided.

Thirdly, the paving thickness and the paving flatness of the upper layer are controlled by the balance beam, a steel wire guide elevation control mode cannot be adopted, the material sticking condition of the balance beam needs to be closely noticed, and the material sticking condition is timely cleared when found, so that the generation of pull marks is prevented. Before the paver walks, the ironing plate is well padded by a wood plate according to the loose paving elevation strictly, so that the initial paving thickness is ensured to meet the requirement.

Continuous and stable paving is the main measure for improving the flatness of the road surface, the paving speed of the paver is adjusted and selected according to the yield of a mixer, the matching condition of a construction machine and the paving thickness according to about 2.5m/min, the paver is slowly, uniformly and uninterruptedly paved, the paver is not required to be quickly paved for a few minutes, then the paver is stopped for the next vehicle, lunch is alternately carried out in batches, the paver is forbidden to be stopped for dining, and the paver is stopped once a day.

Fifthly, before the paved mixture is not compacted, constructors cannot tread.

Sixthly, the loose paving thickness is detected and adjusted at any time in the paving process, and the deviation of the loose paving thickness is ensured to be within 0-3 mm. The quality of the mixed material (including the mixing quality and the mixing proportion) is visually observed, and the problems are found and reported to be processed by technical responsible persons.

Seventhly, attention is paid to the operation procedure of the hopper of the paver, so that continuous feeding is realized, and the concentration of coarse aggregates is avoided, so that the segregation of the coarse aggregates is reduced.

And allowing the skip car to collide with the paver, stopping the skip car at a position 20cm away from the front edge of the paver, adjusting the skip car to be in a neutral position, and pushing the skip car to move forwards by leaning on the paver. The paving quality is observed at any time, and the cause of segregation or other abnormal phenomena is analyzed in time and processed. Bulk materials scattered by the skip car in the paving area must be removed in time.

And ninthly, when the paving machine cannot continuously pave due to machine faults, rain and the like, timely notifying the mixing group of the situation and reporting to a technical responsible person. When the spreading layer is in rain, the construction is immediately stopped, the mixture which is not compacted and formed is removed, the mixture which is in rain is discarded, the mixture cannot be unloaded into a spreading machine for spreading, and the mixture cannot be continuously spread after rain before the lower bearing layer is not fully dried.

7. Compaction of SBS modified asphalt mixture

1) The compaction degree of the SBS modified asphalt mixture is a main control item of the quality of an asphalt surface layer, and the compaction is performed as early as possible on the premise of keeping the rolling temperature and not generating pushing movement according to the principle of 'following, slow compaction, high frequency and low amplitude'.

2) The rolling temperature, speed and number of passes should be performed strictly to specification.

3) The rolling must be carried out evenly and continuously, and the compaction degree change caused by the temperature change is prevented from influencing the compaction degree and the flatness. Rolling should start 30-40 cm inward from the road edge to prevent asphalt mixture extrusion, while allowing the outer edge asphalt to cool to create a stable shear zone to facilitate compaction.

4) When a vibratory roller is adopted to compact the modified asphalt mixture pavement, the overlapping width of the wheel tracks of the roller should not exceed 20 cm; when a static road roller is adopted, the wheel tracks of the road roller are overlapped by the rolling width of 1/3-1/2.

5) When the modified asphalt mixture is rolled, a specially-assigned person is responsible for commanding and coordinating the rolling route and the rolling times of each road roller so that the pavement reaches the specified compaction degree in a short time. The rolling length is not suitable to be too short, too long is not suitable to be too short, rolling is not convenient to be carried out, and the rolling is not solid due to cooling at too long temperature, so that the rolling length is generally controlled within 30-50 m.

Road roller compaction speed, as shown in table 3:

table 3 shows the rolling speed of the road roller

Note: the upper surface layer does not adopt a tyre type road roller.

6) And tracking and detecting the compaction condition by using a nuclear density instrument, finding problems, analyzing reasons in time and adjusting a construction process. The nuclear densitometer should be moved to the outside of the road for cooling every measurement so as to prevent the instrument from being damaged due to high temperature and the detection result from being influenced.

7) In rolling, the machine should start and then vibrate, stop vibrating and then stop, and switch slowly and stably, so that a driving wheel should face a paver in order to avoid a situation that a mixture is crowded to generate a hug during rolling; the rolling route and direction should not change suddenly; the road roller needs to be stepped when turning back, and does not need to be on the same section, and a tyre road roller can not be used during initial pressing

8) Before rolling, adding water; before water in the water tank is sprayed, water should be added in time, the water addition should be carried out on the cooled formed pavement, and the phenomenon that the wheel is stuck due to water shortage is avoided, and the appearance and the quality of the pavement are seriously affected by the drawing mark caused by the wheel sticking.

9) The starting point of the rolling operation section should be marked, preferably indicated by inserting a flag, so as to avoid the phenomenon of pressure leakage.

10) Before the rolled road surface is cooled, any vehicle machine can not be parked on the road surface (including a road roller filled with oil and water), and mineral materials, sundries, oil materials and the like are prevented from falling on the newly paved road surface.

8. Seam treatment

1) The arrangement of the paving work is such that both longitudinal and transverse joints are kept at a minimum.

2) The longitudinal joint of the echelon operation is a thermal joint during paving. The distance between the two spreading machines is preferably 15-30 m, and the ironing plates are arranged on the same level. During construction, the paved mixture part is left with a width of 10-20cm and is not rolled for the time, the paved mixture part is used as an elevation reference surface of a rear paving part, and finally, seam crossing rolling is carried out to eliminate seam marks.

3) When the thermal joint cannot be adopted in the half-width construction, the cutter is adopted for cutting the steel plate evenly. Before laying the other half of the width, the edge of the seam must be cleaned and a small amount of adhesive asphalt is spread. And overlapping the spread layer for 5-10cm during paving, and manually shoveling away the mixed material spread on the front half width after paving. When rolling, the road roller firstly walks on the compacted road surface, rolls a new laying layer for 10-15 cm, then compacts the new laying part, and then stretches over the compacted road surface for 10-15 cm, and fully compacts and tightly the joint seam.

4) The longitudinal seams of the upper layer and the lower layer are staggered by more than 15cm, and the longitudinal seams of the surface layer are straight and are suitable to be left on the lane division line. The longitudinal seam is arranged outside the wheel track of the passing vehicle, is overlapped with the side slope line of the cross slope within 15cm, and has at least 15cm dislocation with the seam of the subjacent layer.

5) When the end of the paving material has cooled due to a work interruption or the work is resumed the next day, a transverse seam is made, which is substantially at right angles to the paving direction, which is staggered by at least 1m between successive levels and adjacent courses, which is vertical and rolled to a good edge.

6) When the newly paved asphalt concrete is connected with the original pavement, bridge deck or other road devices and matched with elevations, the original pavement or bridge deck is cut by enough quantity to ensure that the minimum layer thickness of the newly paved layer specified by the drawing is achieved.

9. Inspection well location treatment

1) Positioning

And marking the center of the well by using a cross line outside the paved road surface and marking.

2) Demolish the walling crib

And (3) chiseling the asphalt concrete protective layer and the cement concrete of the pavement part to 15-20cm below the ground, and transporting the well cover to the roadside in an annular mode.

3) Cover steel plate and paved asphalt concrete

And cleaning the chiseled well mouth part, building the chiseled well mouth part to a specified height by using cement mortar and bricks, hanging down a steel plate which is processed and manufactured in advance, covering the well mouth, and starting to pave asphalt concrete.

4) Chiseling asphalt concrete

And after paving and rolling the asphalt concrete on each layer to a specified thickness, finding out the position of the well mouth according to the preset positioning, and manually chiseling off the asphalt concrete of the well ring by using a steel chisel. And (4) hoisting out the steel plate, cleaning the well ring, laying bricks to the height horizontal to each layer of asphalt concrete, and putting down the steel plate.

5) Installing well ring

After paving is finished and the asphalt concrete on the top layer is chiseled and cleaned, the steel plate is lifted to remove all the built bricks and clean the bricks. And pouring 20# cement mortar into the inner bottom of the wellhead of the well ring, lifting and leveling the well ring to be horizontal to the asphalt concrete pavement by matching a crane, pouring C30 concrete around 10-20cm, and compacting.

10. Seam treatment

3) When the thermal joint cannot be adopted in the half-width construction, the cutter is adopted for cutting the steel plate evenly. Before laying the other half of the width, the edge of the seam must be cleaned and a small amount of adhesive asphalt is spread. And overlapping the spread layer for 5-10cm during paving, and manually shoveling away the mixed material spread on the front half width after paving. When rolling, the road roller firstly walks on the compacted road surface, rolls a new laying layer for 10-15 cm, then compacts a new laying part, and then stretches over the compacted road surface for 10-15 cm, and fully compacts the joint seam tightly.

10. Asphalt pavement finished product protection

1) The specially-assigned person maintains the rolled asphalt concrete surface layer, the enclosure is arranged, and the traffic can be opened after the temperature of the to-be-paved layer of the hot-mixed asphalt mixture road surface is naturally reduced to be lower than 50 ℃.

2) In the time period of not opening traffic, all construction vehicles and machines are strictly forbidden, the vehicles and machines are randomly driven and turned around on the upper layer, and a penalty of 3000 yuan is given once the vehicles and machines are found.

3) The constructor must not walk on the asphalt concrete surface layer which is not rolled.

4) On the asphalt concrete surface layer finished in the same day, no construction machinery equipment is required to be parked so as to avoid the phenomenon of deformation of the asphalt concrete surface layer.

5) Garbage, heavy objects and the like cannot be thrown from high altitude (overpass and the like).

6) And the oil leakage of machinery and equipment and the pollution to the road surface are prevented strictly.

7) Mortar cannot be randomly stacked and poured directly on the asphalt surface layer.

8) Prefabricated parts, rubbles, stones and the like cannot be randomly stacked on the asphalt surface layer directly so as to avoid smashing the surface layer.

9) The crane legs cannot be directly arranged on the asphalt surface layer.

[ eight ] curb stone installation

1. Material

The method comprises the following steps: granite

Mounting and stabilizing mortar: a cement mortar base paddle 3cm thick.

The pointing material: 1:2.5 Cement mortar

Fourthly, reinforcing the concrete by the back: c15 concrete

2. The construction process flow comprises the following steps: measuring and lofting → nailing piles → mortar cushion → building and pointing → back filling and tamping → curing.

The lateral curb foundations should be dug and rolled simultaneously with the roadbed to ensure an overall uniform degree of compaction.

The method includes the steps that 1 control point is arranged every 5M for vertical kerbstone to be hung, installed and built, c15 fine aggregate concrete with design requirements is used as a bedding foundation under the kerbstone, and M10 cement mortar seat slurry with the thickness of 3cm is adopted for the vertical kerbstone. The vertical kerbstone installation joint is pointing with cement mortar. And backfilling plain soil outside the curb and tamping. The paved curb has the advantages of uniform seam width, straight lines, flat top surface and firm construction.

3. Measuring and lofting: after the construction of the base cement stabilized gravel layer is finished, the nailing pile is accurately paid off according to the designed side line, and the edge stone line and the construction elevation are measured and recorded so as to control the direction and the elevation.

4. Nailing a pile: after lofting, grooving to serve as a foundation, nailing piles to hang wires, paying off according to new nailed piles, paying off by using a wire rope in a straight line section, and drawing a line by using lime powder in a curved line section. After the grooving, the stone should be rechecked once before installation, and the side and curb top surface elevation placement marks should be measured.

5. Laying: the curbstone is well arranged along the lime line, after the foundation is made, cement mortar with the thickness of 2 cm is paved to be used as a cushion layer, and the inner side is handed over the bottom content: hanging a wire at a corner; adjustment of inconsistent height of side stones: the lower part of the frame is pried up by a crowbar, and concrete or mortar is filled under the crowbar; the height can be lowered by tamping with wood board or rubber hammer on the top surface until the tolerance is met. Pointing is preferably carried out after pavement laying is finished, and the pointing is carried out by using a pressure meter 1:2.5 the cement mortar is hooked and embedded.

6. Filling and tamping the back of the kerbstone: the compaction degree of the backfill soil is 96 percent. When backfilling, if the kerbstone is inclined or moved, timely trimming; after the kerbstone is built, the inner side is filled with fine stone concrete, and the outer side is filled with soil and tamped, so that the flat kerbstone is prevented from inclining or moving. As shown in fig. 2.

7. Quality requirement

Straight and straight linear parts, smooth and beautiful curved parts and no break angle;

the pointing is full, neat and solid, and the maintenance is not less than three days;

the allowable deviation of the seam width is +/-3 mm;

fourthly, checking that the maximum deviation of the straightness is not more than 10 millimeters by using a 20-meter straight line;

fifthly, the compactness of the filling soil at the bottom of the groove is more than 90 percent.

And sixthly, the height of the upper surface of the curb is controlled, and a line is pulled through the same slope section of the road to ensure that the upper surface of the curb is smooth after the curb is installed.

[ JIU ] road well ring and well grate mounting

1. Process flow

Measuring and paying off → cutting the asphalt surface layer and manually digging a groove → installing a finished rainwater well → installing a rainwater pipe → installing a well ring and a well grate → recovering pavement.

2. Concrete construction method

1) And (3) measurement and paying-off: and (4) according to construction drawings and on-site practice, adding positions of rainwater wells in the ponding road section and scattering lime for burying rainwater pipes.

2) Manual grooving: and cutting the asphalt pavement into a slot by using a cutting machine at the position of the catch basin, and breaking the road water stabilization layer base layer by using an air pick, wherein the breaking size is determined according to the size of the finished catch basin and is 50mm larger than the catch basin so as to fix the catch basin. And the pipeline groove is excavated by using a manual excavation mode according to the pipeline paying-off position, and the slope is paid attention to during excavation, so that water accumulation in the pipeline and the slope is avoided.

3) Installing a rainwater branch pipe: paving gravel sand or broken stone at the bottom of the excavated groove, wherein the thickness is 150mm, and then leveling by using medium sand. And after the pipeline is laid, backfilling the top of the pipeline with medium sand. And backfilling with planting soil to recover greening or paving. When the rainwater pipe is connected with the existing rainwater well, attention should be paid to the fact that the connector is compact and leakage is avoided.

4) Installing a finished catch basin: during installation, the joint of the rainwater branch pipe should not be subject to water seepage. The catch basin should be installed smoothly, squarely, and should pay attention to the installation elevation, confirm according to the road elevation, but should not be higher than the road elevation.

5) Installing a well ring and a rainwater grate: the installation elevation of the walling crib is required to be noticed, the installation is prevented from exceeding the elevation of the pavement, and the installation of the walling crib is required to be square, smooth and firm.

6) And (3) recovering and paving: and (5) recovering pavement in time after the construction of the catch basin is completed.

Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.

Claims

1. A factory floor roadway structure, comprising: the cement-stabilized macadam comprises a brick slag cushion layer, a cement-stabilized macadam base layer, an asphalt permeable layer, a medium-grain asphalt concrete layer, a sticky layer and a fine-grain asphalt concrete layer which are sequentially laid from bottom to top;

2. The factory floor roadway structure of claim 1, wherein the material specification of the asphalt permeable layer is PA-3 pore canal grouting material or PC-3 emulsified asphalt.

3. The factory floor roadway structure of claim 1, wherein the medium-grained asphalt concrete and the fine-grained asphalt concrete are both SBS-B modified asphalt.

4. The factory floor road structure according to claim 1, wherein the adhesive layer is made of adhesive layer oil, and the adhesive layer oil is made of fast-cracking emulsified asphalt or medium-cracking emulsified asphalt or modified emulsified asphalt.

5. The factory floor roadway structure of claim 1, wherein the brick slag cushion layer is made of brick slag resources when the building is dismantled.

6. A secondary permanent-temporary combined layered construction method for a factory road is characterized by comprising the following steps: the method comprises the following steps of (1) performing primary pouring and secondary pouring, wherein secondary permanent-temporary combined layered construction is formed between the primary pouring and the secondary pouring through an adhesive layer;

7. The construction method of the secondary permanent temporary combined layering construction method for the factory road according to claim 6, wherein the construction method of the brick slag cushion layer comprises the steps of leveling the bottom of the groove, backfilling a first layer of brick slag, and rolling by using a compaction machine until a first compaction quality standard is achieved; and backfilling a second layer of brick slag, adding medium coarse sand, and rolling by using a compacting machine again until a second compacting quality standard is reached.

8. The secondary permanent temporary combined layered construction method for the factory road according to claim 7, wherein the first compaction quality standard and the second compaction quality standard are both controlled by rolling passes, and the rolling passes are obtained by determining the passes required when the compaction machine rolls to be compacted according to the relationship between the rolling passes and the degree of compaction of the compaction machine.

9. The secondary permanent temporary combined layered construction method for the factory road according to claim 6, wherein the concrete processes of paving, compacting, seam processing and maintaining of the cement stabilized macadam base layer sequentially comprise:

and (3) maintenance: wetting the permeable non-woven geotextile, and then covering the top surface of the rolled structural layer; after covering, sprinkling water by using a sprinkling nozzle.

10. The secondary permanent temporary combined layered construction method for the factory road according to claim 6, wherein the process of paving, compacting, seam processing and inspection well position processing of the asphalt permeable layer comprises the following steps:

seam treatment: the longitudinal joint of the echelon operation is adopted in the paving process and is a hot joint; when the thermal joint can not be adopted in the half-width construction, the cutting knife is adopted for cutting the steel plate evenly;