A rural highway pavement widening construction method in a rainy area

Abstract

The present application relates to a kind of rural road pavement widening construction methods in rainy area, including the following steps, the material component, density and moisture content of widening section subgrade should be same with the material component, density and moisture content of old roadbed same level layer, the side middle part of old road cement concrete layer is drilled and planted with reinforcement with interval distance, adjacent planted reinforcement interval is 40-50cm, then a layer of SBS anti-cracking paste is uniformly arranged along joint;1-1.5cm thick rubber stress absorbing layer is spread on the upper end surface of new and old road cement concrete layer;With new asphalt, regenerating agent material, graded RAP material, aggregate and mineral powder are mixed in hot state, then asphalt concrete surface layer is paved on the upper end of rubber stress absorbing layer, and the thickness is 5-8cm.The present application prevents water damage caused by rain, delays damage at joint, reduces the probability of crack occurrence, and improves the service performance and durability of pavement.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of rural highway pavement widening construction method in rainy area. BACKGROUND

[0002] In recent years, with the rapid development of social economy, rural roads in various places gradually begin to be reconstructed and upgraded, and widening the road on the basis of the original road is one of the main means of current road reconstruction.

[0003] The present highway is usually composed of a 0.5-1.5m thick roadbed layer, a 15cm thick gravel bottom base layer, an 18-22cm thick cement concrete layer on the top of the bottom base layer, and a 5cm thick asphalt surface layer on the top of the cement concrete. In today's numerous rural road widening reconstruction construction, cracks and even settlement problems are easily generated between the new and old roads after the pavement widening construction, especially in the rainy areas of Central China, where the rainy season is long and rain is frequent, and the water damage, cracks and even settlement problems are more serious. SUMMARY

[0004] The purpose of the present application is to solve the problems existing in the prior art and to provide a rural highway pavement widening construction method in rainy area, which prevents water damage caused by rain, delays damage at the joint, reduces the probability of crack occurrence, and improves the service performance and durability of the pavement.

[0005] To achieve the above purpose, the present application adopts the following technical scheme: a construction method for widening and reconstructing road foundation, comprising the following steps:

[0006] (1) survey and accept the roadbed of the widened area of the outer expansion highway, the natural topography of the site of the widened roadbed section needs to be surveyed on site, the state of the outer expansion and the original roadbed is surveyed, the widened roadbed is sampled on site, and the relevant construction data is recorded in detail, accepted and completed, and then the subsequent construction is started;

[0007] (2) measure and lay out, according to the original roadbed, lay out the edge line of the old pavement layer, set a stake point every 10m for widening edge line layout, and after the layout is completed, spread lime line to mark the boundary of the outer expansion and widening area;

[0008] (3) dig the widened roadbed section of the roadbed along the side of the old highway outward and downward at an angle, to the depth of the roadbed bottom layer, and the width is the width of the widened area plus 1.5m;

[0009] (4) compact or compact the excavated ground of the widened construction section of the roadbed, and the density of the compacted or compacted roadbed should be the same as that of the excavated ground of the same level layer of the old highway;

[0010] (5) On the rammed excavated ground, lay the widened section roadbed layer, the widened section roadbed layer is laid by layer, compacted by layer, and detected by layer, the material composition, density and moisture content of the widened section roadbed layer should be the same as those of the same horizontal layer of the old roadbed, and the widened section roadbed layer and the original roadbed layer are spattered with adhesive at the joint part;

[0011] (6) Lay 15cm-thick gravel on the widened section roadbed layer as the bottom base layer, the material composition, density and moisture content of the bottom base layer should be the same as those of the same horizontal layer of the old roadbed, compacted, and detected to meet the standard;

[0012] (7) Clean the side surface of the old road cement concrete layer, make the side surface form a two-step joint part inward, the step surface is 40cm wide, drill holes and plant steel bars at the middle part of the side surface of the old road cement concrete layer, the interval distance between the adjacent steel bars is 40-50cm, the steel bar is 1.4-2cm in diameter, the length of the steel bar is 100-120cm, the surface is painted with anti-rust paint, the length of the steel bar in the old road cement concrete layer is 50-60cm, the steel bar is filled with adhesive before planting, the length of the steel bar in the widened section cement concrete layer is 50-60cm, then install the template according to the measured and sampled widened section road edge line, pour concrete in the template and carry out curing, the material composition, thickness and density of the widened section cement concrete layer should be the same as those of the cement concrete layer of the old roadbed, and the widened section cement concrete layer is formed;

[0013] (8) The upper asphalt surface layer of the old road is removed by cold milling, the milled material is concentrated and recycled, crushed and screened to obtain the graded RAP material;

[0014] (9) The cracks, cracks and depressions on the upper end surface of the old road cement concrete layer are repaired with cement mortar;

[0015] (10) Clean the upper end surface of the joint part between the new and old road cement concrete layers, and then evenly arrange a layer of SBS anti-cracking paste along the joint part;

[0016] (11) The upper end surface of the new and old road cement concrete layer is cleaned as a whole, and then a 1-1.5cm-thick rubber stress absorbing layer is laid;

[0017] (12) The graded RAP material, aggregate and mineral powder are mixed with new asphalt and regenerating agent material in hot state, and then the asphalt concrete surface layer located on the upper end of the rubber stress absorbing layer is paved, which is 5-8cm thick.

[0018] As a further description of the above technical solution: the layered paving of the widened section subgrade layer is that each layer is paved with a thickness of 20-25 cm, and the overlap joints of the upper and lower layers are staggered by 1 m; after the paving is completed, the paving layer is immediately rolled, the paving layer is rolled first with an HD130 double steel wheel roller with static pressure when advancing and weak vibration when retreating for 2 times, the rolling speed is 1.1-1.2 km / h, then the rolling speed is 1.8-2.1 km / h with a YL37 rubber wheel roller for kneading and pressing for 3 times to ensure the flatness, then the rolling speed is 2.0-2.5 km / h with a Yz36 single steel wheel roller for strong vibration for 3 times, and finally the rolling speed is 2.0-2.5 km / h with a YL37 rubber wheel roller for kneading and pressing for 2 times to ensure the compactness.

[0019] As a further description of the above technical solution: the outwardly inclined angle in the outwardly inclined widened area subgrade along the old concrete road side is 45°-60°.

[0020] As a further description of the above technical solution: the adhesive is the same as the adhesive material contained in the original horizontal road layer, and when the original horizontal road layer does not contain adhesive material, the adhesive is cement or lime, and the spreading thickness of the adhesive is 1 mm.

[0021] As a further description of the above technical solution: the width of the SBS anti-cracking tape is 25 cm, the thickness is 3 mm, the tensile force is >800 N / 50 mm, the water impermeability is that it does not permeate water under 0.3 MPa pressure for 30 min, and the adhesion is ≥4 N / mm.

[0022] As a further description of the above technical solution: the upper end surface of the widened section cement concrete layer is flush with the upper end surface of the old road cement concrete layer.

[0023] As a further description of the above technical solution: the material weight component ratio of the rubber stress absorbing layer is that the base asphalt: waste tire rubber powder: gravel with a particle size of 0.4-0.6 cm: basalt fiber = 100: 20-23: 18-22: 5-6; the gravel is granite or pebbles, the base asphalt is selected from 70# asphalt, the fiber length of the basalt fiber is 10-14 mm, the diameter is 23-37 um, the base asphalt is heated in a heating container to 90-170℃, after being dissolved, the uniformly mixed waste tire rubber powder, gravel and basalt fiber are added, the temperature is increased to 190-200℃, and the rubber stress absorbing layer material is uniformly stirred.

[0024] As a further description of the above technical solution: the RAP material content is 32%, the component ratio is as follows: coarse aggregate with a particle size of 8-15mm: fine aggregate with a particle size of 0-8mm: RAP material: mineral powder is 30:35:32:3, the new asphalt content is 4%, the regenerating agent content is 0.3%, the regenerating agent is RA-25 type regenerating agent, the particle size of the RAP material is 8-12mm, accounting for 45%, and the particle size of the RAP material is less than 8mm, accounting for 55%, the new asphalt is SK70 type base asphalt, the mineral powder is limestone mineral powder with a particle size less than 0.5mm, the coarse aggregate and the fine aggregate meet the local aggregate of the standard place, and the hot-state mixing heating temperature is 110-170 DEG C.

[0025] As a further description of the above technical solution: the material weight ratio in the cement mortar is cement: sand: basalt fiber: water = 1:2.6:0.05:3.3; the cement selects 425 cement, the fiber length of the basalt fiber is 10-14mm, and the diameter is 23-37um.

[0026] The present application has the following beneficial effects:

[0027] 1. It has been proved in practice that the present application is suitable for rural road pavement construction in rainy areas, can effectively prevent the penetration of rainwater, delay the damage at the joint, and reduce the probability of crack occurrence, thereby greatly improving the service performance and durability of the pavement.

[0028] By using the roadbed widening construction method, the construction period can be shortened by 15%, the construction cost can be reduced by 20%, the labor can be saved, the construction efficiency can be improved, the quality of the widened roadbed is good, and the strength of the expanded roadbed is high.

[0029] 2. The present application adopts the construction method that the material components, density and water content of the widened roadbed are the same as those of the same horizontal layer of the old roadbed, so that the bearing data of the new and old roadbeds can be kept consistent, and the damage consequences caused by the inconsistent bearing data of the new and old roadbeds are avoided.

[0030] Meanwhile, the use of the embedded steel bars in the old concrete panel and the use of the butt joint adhesive enable the corresponding layers of the new and old roadbeds to be effectively connected, form a whole, work together, bear stress as a whole, and be beneficial to reducing the generation of cracks at the joint.

[0031] A layer of SBS anti-cracking paste is laid at the joint of the new and old concrete layers, the high-strength high-temperature-resistant fabric on the surface of the anti-cracking paste has great tensile strength, can effectively resist the tensile stress at the interlayer joint, limit the development of crack width, and play a role of reinforcement, meanwhile, the anti-cracking paste can form a complete water-blocking and anti-seepage layer, cut off the downward infiltration path of rain and snow, thereby reducing the water damage of the pavement and the roadbed, and secondly, the anti-cracking paste can also improve the force transmission effect between the panels and delay the damage at the joint.

[0032] A rubber stress-absorbing layer is installed beneath the asphalt surface layer. Within this layer, asphalt is strongly bonded to waste tire rubber powder, crushed stone, and basalt fibers, forming a crack-reflecting structure layer approximately 1-1.5 cm thick. Cracks at the joints between new and old concrete, as well as in the old cement pavement, will have difficulty penetrating this layer, effectively inhibiting crack reflection. Simultaneously, the rubber asphalt forms an asphalt film approximately 3 mm thick on the road surface, preventing rainwater penetration and protecting the base course and subgrade. Furthermore, during the paving of the asphalt mixture, the rubber asphalt at the top of the stress-absorbing layer melts a second time, and after compaction, it fully fills the gaps at the bottom of the surface mixture, eliminating the possibility of water accumulation between layers and preventing water damage. The rubber asphalt also possesses superior adhesion, allowing it to firmly bond to the old cement concrete pavement, thus providing adhesion to the asphalt surface layer. This invention effectively prevents rainwater penetration, delays damage at joints, and reduces the likelihood of cracking, thereby significantly improving the pavement's performance and durability. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the widened roadbed structure of the present invention. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. To facilitate understanding of the technical means, creative features, and achieved objectives and effects of the present invention, the present invention will be further elaborated below with reference to specific embodiments. However, the following embodiments are merely preferred embodiments of the present invention and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation details without creative effort are all within the protection scope of the present invention. Unless otherwise specified, the methods in the following embodiments are conventional methods, and the materials, devices, equipment, etc., used in the following embodiments can be obtained commercially unless otherwise specified.

[0035] Example 1: As Figure 1 As shown, a construction method for widening and renovating the road foundation includes the following steps:

[0036] (1) Conduct a survey and acceptance inspection of the roadbed for the widened and expanded area highway. This includes an on-site survey of the natural topography of the area requiring roadbed widening, the condition of each layer of the existing and expanded roadbed, and on-site sampling and detailed recording of the widened roadbed. This includes drilling and sampling of each layer of the old roadbed, analyzing the material composition of each layer, and obtaining construction records for each layer of the old roadbed. After completing the survey and other data, and ensuring acceptance, and based on this, complete the design and related construction data for the widened and expanded area highway before commencing subsequent construction.

[0037] (2) Measurement loft, according to the original roadbed loft old pavement layer edge line, set a stake point for each 10 m to widen the edge loft, loft after the spread lime line to mark the boundary of the outer expansion widening area.

[0038] (3) along the old road side outward oblique down digging widening area road section roadbed, depth to the roadbed bottom layer, width is the width of the widening area plus 1.5 m. In the construction of Tianmen City SH-1 rural road project rural road reconstruction, the old road width is 6 m, after widening to 15 m, then along the old road side outward oblique down digging widening area road section roadbed width is 10.5 m, outward oblique angle is 45°-60°.

[0039] (4) ramming or compaction of roadbed widening construction section of the excavated ground, the ramming or compaction of roadbed density should be the same as the old road of the same level layer of the excavated ground density.

[0040] (5) on the rammed excavated ground paving widening section roadbed layer 1, widening section roadbed layer using layer paving, layer compaction, layer detection, the material composition, density and moisture content of the widening section roadbed should be the same as the old roadbed of the same level layer of the material composition, density and moisture content, the widening section roadbed layer and the original roadbed layer interface spread with adhesive. If the same level layer of the material obtained in the construction of the old roadbed is volume ratio: lime: gravel: soil = 2:3:5, thickness 0.6 m; the maximum density (KN / m 3 ) 1.95, moisture content 12%, then the material composition, density and moisture content of the widening section roadbed layer should be the same as this. The adhesive is white lime, the thickness of the adhesive is 1 mm.

[0041] The widening section roadbed layer is divided into 3 layers: each layer paving thickness is 20 cm, the upper and lower layers of lap joint stagger 1 m, rolling is completed after paving, immediately for the paving layer rolling, paving layer rolling is first with HD130 double steel wheel roller forward static pressure backward weak vibration 2 times, rolling speed 1.1-1.2 km / h, ensure the flatness, then with YL37 rubber wheel roller kneading pressure 3 times, rolling speed 1.8-2.1 km / h; then with Yz36 single steel wheel roller strong vibration 3 times, finally with YL37 rubber wheel roller kneading pressure 2 times, rolling speed 2.0-2.5 km / h, ensure the compaction degree.

[0042] (6) on the widening section roadbed layer paving 15 cm thick gravel as the bottom layer 9, the material composition, density and moisture content of the bottom layer should be the same as the old roadbed of the same level layer of the material composition, density and moisture content, compaction, detection of the bottom layer.

[0043] (7) Clean the side surface of the old road cement concrete layer 3, so that the side surface forms a two-step interface inward, the step surface is 40 cm wide, and the longitudinal road in the middle of the side surface of the old road cement concrete layer is drilled with a spacing distance to plant a steel bar, the spacing distance between adjacent steel bars is 40-50 cm, the steel bar is a steel bar 4 with a diameter of 1.4-2 cm, the length of the steel bar is 100-120 cm, the surface is coated with anti-rust paint, the length of the steel bar in the old road cement concrete layer is 50-60 cm, the steel bar is injected with a steel bar glue into the steel bar hole before planting, the length of the steel bar in the cement concrete layer 2 of the widened section is 50-60 cm, then a template is installed according to the measured and sampled widened section road edge line, the template is poured with concrete and is cured, the material composition, thickness and density of the widened section cement concrete layer should be the same as those of the old road cement concrete layer, so as to form the widened section cement concrete layer 2.

[0044] (8) The upper asphalt surface layer of the old road surface is removed by cold milling, the milled material is concentrated and recycled, then is crushed and screened to obtain a graded RAP material. The upper end surface of the widened section cement concrete layer is flush with the upper end surface of the old road cement concrete layer.

[0045] (9) The cracks, cracks and depressions on the upper end surface of the old road cement concrete are repaired with cement mortar; the material weight ratio in the cement mortar is cement: sand: basalt fiber: water = 1:2.6:0.05:3.3; the cement is selected from 425 cement, the fiber length of the basalt fiber is 10-14 mm, and the diameter is 23-37 um. The sand is screened river sand. The repair adopts the traditional method of grouting cracks, repairing cracks and depressions with cement mortar.

[0046] (10) The upper end surface of the joint between the new and old road cement concrete layers is cleaned, and then a layer of SBS anti-cracking paste 5 is uniformly arranged along the joint. The width of the SBS anti-cracking paste is 25 cm, the thickness is 3 mm, the tensile force is >800 N / 50 mm, the water impermeability is that it does not permeate water for 30 min under 0.3 MPa pressure water, and the adhesion is ≥4 N / mm.

[0047] (11) The upper end surface of the new and old road cement concrete layer is cleaned, and then a 1-1.5 cm thick rubber stress absorbing layer 6 is laid on the upper end surface of the new and old road cement concrete layer. The material weight component ratio of the rubber stress absorbing layer is matrix asphalt: waste tire rubber powder: crushed stone with a particle size of 0.4-0.6 cm: basalt fiber = 100: 20-23: 18-22: 5-6; the crushed stone is granite or pebble, the matrix asphalt is selected from 70 asphalt, the fiber length of the basalt fiber is 10-14 mm, and the diameter is 23-37 um, the matrix asphalt is heated in a heating container at 90-170℃, after being dissolved, the waste tire rubber powder, crushed stone and basalt fiber are added and uniformly mixed, the temperature is raised to 190-200℃, the rubber stress absorbing layer material is obtained after being uniformly stirred, and the laying temperature is 135-170℃.

[0048] (12) with graded RAP material, aggregate, mineral powder and new asphalt, regenerative material for hot mixing, and then paving the asphalt concrete surface layer 7 on the upper end of the rubber stress absorbing layer, with a thickness of 5-8 cm. The RAP material content is 32%, and the ratio of each component is as follows: coarse aggregate with a particle size of 8-15 mm: fine aggregate with a particle size of 0-8 mm: RAP material: mineral powder is 30:35:32:3, the new asphalt content is 4%, the regenerative agent content is 0.3%, the regenerative agent is RA-25 type regenerative agent, the particle size of RAP material is 8-12 mm, accounting for 45%, and the particle size below 8 mm accounts for 55%, the new asphalt is SK70 base asphalt, the mineral powder is limestone powder with a particle size of less than 0.5 mm, the coarse and fine aggregates meet the local production aggregate standards, and the hot mixing heating temperature is 110-170℃. The paving temperature is 135-170℃, the initial pressing temperature is 130-140℃, and the re-pressing and final pressing temperature is not less than 80℃.

[0049] Then, the curbstone and the construction side slope 8 are arranged on the outer side of the asphalt surface layer, that is, the outer extension surface of the pavement structure layer is arranged with column grooves at an interval distance in the longitudinal direction, the anti-collision plate is arranged on the inner side of the upper part of the guardrail column, the water collecting tank with a rain grate is arranged on the inner side of the upper end of the pavement structure layer of the drain pipe, the lower end of the water collecting tank is communicated with the upper end of the drain pipe, and the construction of the widened roadbed is completed. The traditional technology is not repeated.

[0050] The method of example 1 is applied to a test section of 3 kilometers in the rural road reconstruction construction of Tianmen City SH-1 rural road project (referred to as the present invention), and the remaining sections are constructed by the traditional method. After the construction is completed, the appearance comparison data after 720 days is as follows:

[0051] Table 1:

[0052]

[0053] The comparison data in table 1 shows that the present invention is suitable for rural road pavement construction in rainy areas, can effectively prevent the penetration of rainwater, delay the damage at the joint, and reduce the probability of crack occurrence, thereby greatly improving the service performance and durability of the pavement.

[0054] The above is only the preferred specific implementation of the present invention, but the protection scope of the present invention is not limited to this. Any skilled person in the art can make equivalent replacement or change according to the technical solution and the inventive concept of the present invention within the technical range disclosed by the present invention, which should be covered within the protection scope of the present invention.

Claims

1. A method for widening the pavement of a rural road in a rainy area, characterized by, It comprises the following steps: (1) The roadbed of the widened road is surveyed and accepted, and the natural conditions of the site of the widened roadbed section, the widening and the state of each layer of the original roadbed are surveyed on site. After sampling, detailed records are made, and after the relevant construction data are accepted and completed, the subsequent construction is started; (2) The measurement and setting out are carried out according to the original roadbed, and the edge line of the old pavement layer is set out. The edge line setting out is carried out every 10 m, and the widening edge line setting out is carried out. After setting out, lime line is scattered to mark the boundary of the widened area; (3) The roadbed of the widened area is excavated obliquely downward along the side of the old road, and the depth is to the bottom layer of the roadbed, and the width is the width of the widened area plus 1.5 m; (4) The excavated ground of the roadbed widening construction section is tamped or compacted, and the density of the tamped or compacted roadbed should be the same as that of the excavated ground of the same level layer of the old road; (5) The roadbed layer of the widened section is laid on the tamped excavated ground, and the roadbed layer of the widened section is laid by layer paving, layer compaction, layer detection, and the material composition, density and moisture content of the roadbed layer of the widened section should be the same as those of the same level layer of the old roadbed, and the roadbed layer of the widened section and the original roadbed layer are bonded with adhesive; (6) A 15 cm thick gravel is laid on the roadbed layer of the widened section as a bottom base layer, and the material composition, density and moisture content of the bottom base layer should be the same as those of the same level layer of the old roadbed, and the bottom base layer is compacted and detected; (7) The side of the old road cement concrete layer is cleaned to form a two-step interface inward, and the step surface is 40 cm wide. The steel bars are planted in the middle of the side of the old road cement concrete layer with a longitudinal road at an interval distance, and the interval distance between adjacent steel bars is 40-50 cm. The steel bar is 1.4-2 cm in diameter, and the length is 100-120 cm. The surface is coated with anti-rust paint. The length of the steel bar in the old road cement concrete layer is 50-60 cm. The steel bar is filled with adhesive before planting. The length of the steel bar in the widened section of the cement concrete layer is 50-60 cm. Then the template is installed according to the measurement and setting out of the widened section of the road edge line. The concrete is poured in the template and cured. The material composition, thickness and density of the cement concrete layer of the widened section should be the same as those of the cement concrete layer of the old roadbed, and the cement concrete layer of the widened section is formed; (8) The upper asphalt surface layer of the old road is removed by cold milling. The milled material is concentrated and recycled for crushing and screening to obtain graded RAP material; (9) The cracks, cracks and depressions of the upper end surface of the old road cement concrete layer are repaired with cement mortar; (10) The upper end surface of the joint between the new and old road cement concrete layers is cleaned, and then a layer of SBS crack prevention paste is uniformly arranged along the joint; (11) The upper end surface of the cement concrete layer of the new and old road is cleaned as a whole, and then a 1-1.5 cm thick rubber stress absorbing layer is paved; the material weight component ratio of the rubber stress absorbing layer is as follows: base asphalt: waste tire rubber powder: 0.4-0.6 cm particle size of crushed stone: basalt fiber = 100: 20-23: 18-22: 5-6; the crushed stone is granite or pebble, the base asphalt is selected from No. 70 asphalt, the fiber length of the basalt fiber is 10-14 mm, the diameter is 23-37 um, the base asphalt is heated in a heating container at 90-170 DEG C, and after being dissolved, the waste tire rubber powder, the crushed stone and the basalt fiber are added and uniformly mixed, and the temperature is increased to 190-200 DEG C, and the rubber stress absorbing layer material is obtained after uniform stirring; (12) The graded RAP material, aggregate, mineral powder, new asphalt and regenerating agent material are hot mixed, and then the asphalt concrete surface layer located on the upper end of the rubber stress absorbing layer is paved, and the thickness is 5-8 cm; the RAP material content is 32%, the component ratio is as follows: 8-15 mm particle size of coarse aggregate: 0-8 mm particle size of fine aggregate: RAP material: mineral powder = 30: 35: 32: 3, the new asphalt content is 4%, the regenerating agent content is 0.3%, the regenerating agent is RA-25 type regenerating agent, the particle size of the RAP material is 8-12 mm, accounting for 45%, and the particle size below 8 mm accounts for 55%, the new asphalt is SK70 base asphalt, the mineral powder is selected from limestone mineral powder with a particle size of less than 0.5 mm, the coarse and fine aggregates meet the local aggregate production standards, and the hot mixing heating temperature is 110-170 DEG C; the outward inclined angle of the outward inclined clamping angle in the widened area roadbed of the old concrete road side is 45 DEG-60 DEG.

2. The method of claim 1, wherein: The layer-by-layer paving of the widened roadbed layer is as follows: the paving thickness of each layer is 20-25 cm, the upper and lower two layers are staggered by 1 m, and the rolling is performed immediately after the paving is completed; the rolling of the paving layer is as follows: first, the HD130 double steel wheel roller is used to advance with static pressure and retreat with weak vibration for 2 times, the rolling speed is 1.1-1.2 km / h, the flatness is ensured, then the YL37 rubber tire roller is used for kneading and pressing for 3 times, the rolling speed is 1.8-2.1 km / h, then the Yz36 single steel wheel roller is used for strong vibration for 3 times, and finally the YL37 rubber tire roller is used for kneading and pressing for 2 times, the rolling speed is 2.0-2.5 km / h, and the compaction degree is ensured.

3. The method of claim 1, wherein: The adhesive is the same as the adhesive material contained in the original same horizontal road layer, and the adhesive is cement or lime when the original same horizontal road layer does not contain the adhesive material, and the spreading thickness of the adhesive is 1 mm.

4. The method of claim 1, wherein: The width of the SBS anti-cracking patch is 25 cm, the thickness is 3 mm, the tensile force is greater than 800 N / 50 mm, the water impermeability is that no water is permeated under 0.3 MPa pressure water for 30 min, and the adhesion is greater than or equal to 4 N / mm.

5. The method of claim 1, wherein: The upper end surface of the widened cement concrete layer is flush with the upper end surface of the old cement concrete layer.

6. The method of claim 1, wherein: The RAP material content is 32%, the component ratio is as follows: coarse aggregate with particle size of 8-15mm: fine aggregate with particle size of 0-8mm: RAP material: mineral powder is 30:35:32:3, the new asphalt content is 4%, the regenerating agent content is 0.3%, the regenerating agent is RA-25 type regenerating agent, the particle size of the RAP material is 8-12mm, accounting for 45%, and the particle size below 8mm accounts for 55%, the new asphalt is SK70 type base asphalt, the mineral powder is limestone mineral powder with particle size less than 0.5mm, the coarse aggregate and fine aggregate conform to the local standard aggregate, and the hot state mixing heating temperature is 110-170℃.

7. The method of claim 1, wherein: The material weight ratio in the cement mortar is as follows: cement: sand: basalt fiber: water = 1:2.6:0.05:3.3; The cement is 425 type cement, the basalt fiber length is 10-14mm, and the diameter is 23-37um.

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