Pavement cold-in-place recycling construction method

Abstract

The invention relates to the technical field of road construction, and discloses a pavement in-situ cold recycling construction method which comprises the following construction steps: 1) traffic closing is performed on a construction road section; 2) cutting the two sides of the construction road surface to form a milling road section; (3) milling the milled road section to obtain an old asphalt material, adding a regeneration stabilizer, water and gravel aggregate into the old asphalt material, and stirring and mixing to form a mixture; 4) paving the mixture on a construction pavement by an asphalt paver; (5) a rolling scheme is formulated, so that the rolling times of all the parts are the same, and later maintenance is conducted; the in-situ cold regeneration process is carried out through a series of operation such as pretreatment of a construction pavement, addition of cement, a regeneration stabilizer, water and gravel aggregate, milling, paving and compaction, all the regeneration steps are completed step by step in sequence, the operation controllability is high, construction is flexible, the cost is lower, and waste discharge is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of road construction, and in particular to an in-situ cold regeneration construction method for a road surface. Background Art

[0002] Highways are an important indicator of a country's economic strength and modernization level, and have a significant driving effect on the national economy and social development. With the rapid development of my country's highway industry, the maintenance task of highways has become increasingly heavy. my country's highways are mainly asphalt pavements, which are widely used in road projects, from rural roads to urban roads, from third-level highways to expressways. However, due to the differences in the asphalt concrete material itself, as well as the influence of the design, construction and maintenance level and the external environment, asphalt pavements often have cracks, looseness, subsidence, cracking, oil spills, rutting, potholes and other defects. The emergence of these defects seriously affects the driving speed and driving safety, shortens the service life of the asphalt pavement, and thus shortens the service life of the pavement. Therefore, it is necessary to repair the damaged asphalt pavement.

[0003] In the related art, when repairing the semi-rigid base and subbase roads that were damaged in the early stage, the traditional process is to plan the cracks and then repave with gravel and asphalt for repair. The inventors found that this process has obvious disadvantages. First, the scraped asphalt and other waste materials need to be disposed of harmlessly. Secondly, repaving requires a lot of construction costs, which is not in line with the circular economy model industrial chain advocated by the country. Summary of the invention

[0004] The purpose of the present invention is to provide a method for in-situ cold regeneration of a pavement, aiming to solve the problem of increased waste discharge in the process of asphalt pavement repair in the prior art.

[0005] The present invention is implemented in this way: the construction method of cold regeneration of pavement in situ comprises the following construction steps:

[0006] 1) Construction preparation, traffic closure of the construction section;

[0007] 2) First, cut both sides of the construction road surface to form a milling section between the construction road surface and the intact road surface;

[0008] 3) Spreading powdered cement on the milling section by a spreader, milling the milling section by a cold regeneration machine to obtain old asphalt material, and adding a regeneration stabilizer, water and crushed stone aggregate to the old asphalt material to form a mixture;

[0009] 4) The mixture is spread continuously, evenly and uninterruptedly on the construction road surface behind it by the asphalt paver;

[0010] 5) According to the width of the milling section, the wheel width and wheelbase of the roller, a rolling plan is formulated to ensure that each part is rolled the same number of times, and both sides of the construction road surface are rolled two to three times more; and subsequent maintenance is carried out.

[0011] Furthermore, in the construction step 2), the milling section is cut by a road surface cutting device, and marking lines are drawn before cutting, and cutting is performed along the marking lines during the cutting process.

[0012] Furthermore, in the construction step 2), after the cutting of both sides of the milling section is completed, both ends of the milling section need to be cut so that the two sides of the milling section are butted together to form a square milling area.

[0013] Furthermore, in the construction step 3), before construction, an isolation board is set outside the milling section, and the isolation board is laid along the length direction of the milling section, blocking the side of the milling section away from the construction road surface, and the height is greater than the height of the construction road surface.

[0014] Furthermore, in the construction step 3), the cold regenerator mills the asphalt waste material and adds a regeneration stabilizer and water to form a stabilized waste material, which is transported to the asphalt paver at the rear by the onboard conveyor belt of the cold regenerator.

[0015] Furthermore, in the construction step 4), the asphalt paver adds the stabilized old material to the crushed stone aggregate during the mixing process to obtain the mixture.

[0016] Furthermore, in the construction step 5), double steel wheel rolling equipment or rubber wheel rolling equipment is used for static pressure to eliminate wheel marks.

[0017] Furthermore, in the construction step 3), the spreader has a discharge port for sprinkling powdered cement, the discharge port is connected to an external pressure cover, the external pressure cover is arranged in an inclined state with respect to the discharge port, a plurality of elastically retractable guide wheels are arranged on the bottom of the external pressure cover, a pressure panel away from the discharge port is arranged on the external pressure cover, the pressure panel is located at the bottom of the external pressure cover, and the pressure panel is extended along the length direction of the external pressure cover.

[0018] Furthermore, a scraper bar is provided on one end of the outer pressure cover away from the discharge port, the scraper bar is hingedly connected to the outer pressure cover, the scraper bar and the pressure plate are arranged adjacent to each other, a plurality of rake teeth are provided on the bottom of the scraper bar, the plurality of rake teeth are arranged in sequence along the length direction of the scraper bar, and adjacent rake teeth are spaced apart to form a hollow opening.

[0019] Furthermore, enclosing plates are respectively provided on both sides of the outer pressure cover, and the enclosing plates are hingedly connected to the outer pressure cover. The outer pressure cover and the two enclosing plates and the scraper strip form a material guiding area, and the material guiding area is connected to the discharge port. The guide wheel is located in the material guiding area, and a wear-resistant strip is provided at the bottom of the enclosing plate, and the wear-resistant strip is fixedly connected to the enclosing plate. One end of the enclosing plate is movably abutted against one end of the scraper strip.

[0020] Compared with the prior art, the in-situ cold regeneration construction method of the pavement provided by the present invention performs an in-situ cold regeneration process through a series of operations such as pretreatment of the construction pavement, addition of cement, regeneration stabilizer and water, crushed stone aggregate, milling, paving and compaction, etc., and each step of the regeneration is completed step by step in sequence, the operation is highly controllable, and the construction is flexible. The cost is lower and waste emissions are reduced. Cutting on both sides of the construction pavement can avoid damage to the intact pavement during the milling process; the problem of increased waste emissions in the process of asphalt pavement repair is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the construction process of the in-situ cold regeneration construction method of the pavement provided by the present invention;

[0022] Figure 2 It is a schematic side view of the structure of the outer gland provided by the present invention;

[0023] Figure 3 It is a schematic diagram of the structure of the outer pressure cover provided by the present invention when viewed from above.

[0024] In the figure: an outer pressure cover 10, a guide wheel 20, a pressure plate 30, an enclosure plate 40, a material guide area 50, a scraper bar 11, a rake tooth 12, a hollow opening 13, and a wear-resistant strip 41. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0026] The implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0027] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0028] Reference Figure 1-3 The figure shows a preferred embodiment of the present invention.

[0029] The construction method of in-situ cold regeneration of pavement includes the following construction steps:

[0030] 1) Construction preparation, traffic closure of the construction section;

[0031] 2) First, cut both sides of the construction road surface to form a milling section between the construction road surface and the intact road surface;

[0032] 3) Spreading powdered cement on the milling section by a spreader, milling the milling section by a cold regeneration machine to obtain old asphalt material, and adding a regeneration stabilizer, water and crushed stone aggregate to the old asphalt material to form a mixture;

[0033] 4) The mixture is spread continuously, evenly and uninterruptedly on the construction road surface behind it by the asphalt paver;

[0034] 5) According to the width of the milling section, the wheel width and wheelbase of the roller, a rolling plan is formulated to ensure that each part is rolled the same number of times, and both sides of the construction road surface are rolled two to three times more; and subsequent maintenance is carried out.

[0035] The above-mentioned on-site cold regeneration construction method of the pavement is a process of on-site cold regeneration through a series of operations such as pretreatment of the construction pavement, addition of cement, regeneration stabilizer and water, crushed stone aggregate, milling, paving and compaction. The various steps of regeneration are completed step by step in sequence, the operation is highly controllable, and the construction is flexible. The cost is lower and waste emissions are reduced. Cutting on both sides of the construction pavement can avoid damage to the intact pavement during the milling process; the problem of increased waste emissions in the process of asphalt pavement repair is solved.

[0036] A double-steel-wheel oscillating roller is installed behind the asphalt paver for initial compaction. During the initial compaction, the roller is first followed closely behind the asphalt paver for static compaction. After static compaction, an oscillating roller is used for vibration compaction. The number of compaction passes should be sufficient to ensure that the compaction degree within 2 / 3 of the thickness of the bottom of the regenerated layer meets the specified requirements. Each rolling starts from the starting point of the construction section and ends at the edge of the asphalt paver. The rolling width should exceed the regenerated width.

[0037] The working speed of the roller shall not exceed 3km / h. If wheel sticking occurs during the initial compaction with a large-tonnage single-steel-wheel roller, first let the rubber-wheel roller sprinkle water in advance for pre-compaction and then perform the initial compaction. After the initial compaction, use a double-steel-wheel oscillating roller to vibrate for re-compaction. For straight lines and flat curves without superelevation, when rolling from the shoulder to the center of the road, 1 / 2 wheel width should be overlapped. One pass is when the entire width of the road surface is rolled, and generally 6 to 8 passes are required. The rolling speed of the roller should be 1.5 to 1.7 km / h for the first two passes, and 2.0 to 2.5 km / h thereafter. Finally, use a rubber-wheel roller for final compaction, not less than 8 times, and sprinkle water for rolling when necessary.

[0038] In this embodiment, in the construction step 2), the milling section is cut by the road surface cutting device, and the marking line is drawn before cutting, and the cutting is carried out along the marking line during the cutting process. In this way, it can be avoided that the construction range is exceeded during the cutting process, and the construction efficiency can also be improved.

[0039] In this embodiment, in construction step 2), after the cutting of both sides of the milling section is completed, the two ends of the milling section need to be cut so that the two sides of the milling section are butted together to form a square milling area. In this way, the cutting route can form a closed loop to determine the starting point and end point of subsequent construction.

[0040] In this embodiment, in construction step 3), before construction, an isolation board is set outside the milling section. The isolation board is laid along the length direction of the milling section, blocking the side of the milling section away from the construction road surface, and the height is greater than the height of the construction road surface. In this way, some waste materials of the cold regeneration machine can be prevented from splashing out of the construction section during the milling process, thereby improving the safety during the construction process.

[0041] In this embodiment, in construction step 3), the cold regenerator mills the asphalt waste material and adds the regeneration stabilizer and water to form a stable waste material, which is then transported to the asphalt paver at the rear by the onboard conveyor belt of the cold regenerator. In this way, it is convenient for the asphalt paver to recycle and pave.

[0042] In this embodiment, in construction step 4), the asphalt paver adds the stabilized old material to the crushed stone aggregate during the mixing process to obtain a mixture. In this way, the construction efficiency can be improved.

[0043] In construction step 5), double steel wheel rolling equipment or rubber wheel rolling equipment is used for static pressure to eliminate wheel marks.

[0044] In this embodiment, in construction step 3), the spreader has a discharge port for sprinkling powdered cement, the discharge port is connected to an outer pressure cover 10, the outer pressure cover 10 and the discharge port are arranged in an inclined state, a plurality of elastically retractable guide wheels 20 are arranged on the bottom of the outer pressure cover 10, a pressure panel 30 away from the discharge port is arranged on the outer pressure cover 10, the pressure panel 30 is located at the bottom of the outer pressure cover 10, and the pressure panel 30 is extended along the length direction of the outer pressure cover 10.

[0045] The spreader covers the spread powdered cement through an external pressure cover 10 to prevent dust from being generated during the spreading process. The external pressure cover 10 rolls the spread powdered cement using a pressure plate 30 so that the powdered cement can be spread more densely on the milling section. The external pressure cover 10 can achieve a shock-absorbing effect during the rolling and covering process through a plurality of elastically retractable guide wheels 20.

[0046] In this embodiment, a scraper bar 11 is provided on one end of the outer gland 10 away from the discharge port, and the scraper bar 11 is hingedly connected to the outer gland 10. The scraper bar 11 and the pressure plate 30 are arranged adjacent to each other. A plurality of rake teeth 12 are provided on the bottom of the scraper bar 11, and the plurality of rake teeth 12 are arranged in sequence along the length direction of the scraper bar 11, and adjacent rake teeth 12 are spaced apart to form a hollow opening 13. In this way, the outer gland 10 can rake and plow the paved powdered cement through the plurality of rake teeth 12 on the scraper bar 11, so that the powdered cement forms a pile, and dust is not easy to appear. The hollow opening 13 can be used to discharge the crushed stones under the outer gland 10, and prevent excessive crushed stones from accumulating under the outer gland 10; the scraper bar 11 is hingedly connected to the outer gland 10 to facilitate the collision and damage of the plurality of rake teeth 12 during the process.

[0047] In this embodiment, enclosing plates 40 are respectively provided on both sides of the outer pressure cover 10, and the enclosing plates 40 are hingedly connected to the outer pressure cover 10. The outer pressure cover 10 and the two enclosing plates 40 and the scraper strip 11 enclose a material guide area 50, and the material guide area 50 is connected to the discharge port. The guide wheel 20 is located in the material guide area 50, and a wear-resistant strip 41 is provided at the bottom of the enclosing plate 40. The wear-resistant strip 41 is fixedly connected to the enclosing plate 40, and one end of the enclosing plate 40 is movably abutted against one end of the scraper strip 11.

[0048] The outer pressure cover 10 is enclosed by two enclosure plates 40 and a scraper strip 11 to cover the powdered cement entering the material guide area 50, further preventing dust from being generated during the spreading of the powdered cement. The enclosure plate 40 is protected from collision damage by a wear-resistant strip 41.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. In-situ cold regeneration construction method of pavement, It is characterized in that The construction steps include: 1) Construction preparation, traffic closure of the construction section; 2) First, cut both sides of the construction road surface to form a milling section between the construction road surface and the intact road surface; 3) Spreading powdered cement on the milling section by a spreader, milling the milling section by a cold regeneration machine to obtain old asphalt material, and adding a regeneration stabilizer, water and crushed stone aggregate to the old asphalt material to form a mixture; 4) The mixture is spread continuously, evenly and uninterruptedly on the construction road surface behind it by the asphalt paver; 5) According to the width of the milling section, the wheel width and wheelbase of the roller, a rolling plan is formulated to ensure that each part is rolled the same number of times, and both sides of the construction road surface are rolled two to three times more; and subsequent maintenance is carried out.

2. The method for cold in-situ regeneration of a road surface as claimed in claim 1, It is characterized in that In the construction step 2), the milling road section is cut by a road surface cutting device. Before cutting, a marking line is drawn, and cutting is performed along the marking line during the cutting process.

3. The method for cold in-situ regeneration of a road surface as claimed in claim 2, It is characterized in that In the construction step 2), after the cutting of both sides of the milling section is completed, both ends of the milling section need to be cut so that the two sides of the milling section are butted together to form a square milling area.

4. The method for cold in-situ regeneration of a road surface as claimed in claim 3, It is characterized in that In the construction step 3), before construction, an isolation board is set outside the milling section, and the isolation board is laid along the length direction of the milling section, blocking the side of the milling section away from the construction road surface, and the height is greater than the height of the construction road surface.

5. The method for cold in-situ regeneration of a road surface as claimed in claim 4, It is characterized in that In the construction step 3), the cold regenerator mills the asphalt waste material and adds a regeneration stabilizer and water to form a stabilized waste material, which is then transported to the asphalt paver at the rear by the onboard conveyor belt of the cold regenerator.

6. The method for cold in-situ regeneration of a road surface as claimed in claim 5, It is characterized in that In the construction step 4), the asphalt paver adds the stabilized old material to the crushed stone aggregate during the mixing process to obtain the mixture.

7. The method for cold in-situ regeneration of a road surface as claimed in claim 6, It is characterized in that In the construction step 5), double steel wheel rolling equipment or rubber wheel rolling equipment is used for static pressure to eliminate wheel marks.

8. The method for in-situ cold regeneration of a pavement according to any one of claims 1 to 7, It is characterized in that In the construction step 3), the spreader has a discharge port for sprinkling powdered cement, the discharge port is connected to an outer pressure cover, the outer pressure cover and the discharge port are arranged in an inclined state, a plurality of elastically retractable guide wheels are arranged on the bottom of the outer pressure cover, a pressure panel away from the discharge port is arranged on the outer pressure cover, the pressure panel is located at the bottom of the outer pressure cover, and the pressure panel is extended along the length direction of the outer pressure cover.

9. The method for cold in-situ regeneration of a road surface as claimed in claim 8, It is characterized in that A scraper bar is provided on one end of the outer pressure cover away from the discharge port, and the scraper bar is hingedly connected to the outer pressure cover. The scraper bar and the pressure plate are arranged adjacent to each other, and a plurality of rake teeth are provided on the bottom of the scraper bar. The plurality of rake teeth are arranged in sequence along the length direction of the scraper bar, and adjacent rake teeth are spaced apart to form a hollow opening.

10. The method for cold in-situ regeneration of a road surface as claimed in claim 9, It is characterized in that Enclosing plates are respectively provided on both sides of the outer pressure cover, and the enclosing plates are hingedly connected to the outer pressure cover. The outer pressure cover, the two enclosing plates and the scraper strip form a material guiding area, and the material guiding area is connected to the discharge port. The guide wheel is located in the material guiding area, and a wear-resistant strip is provided at the bottom of the enclosing plate, and the wear-resistant strip is fixedly connected to the enclosing plate. One end of the enclosing plate is movably abutted against one end of the scraper strip.

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