Construction waste roadbed construction method

Abstract

The invention discloses a construction waste roadbed construction method, and relates to the technical field of roadbed construction, the construction waste roadbed construction method comprises the following construction steps: A) construction preparation; b) substrate treatment; c) paving and leveling; d) sprinkling water and sealing the materials; e) rolling; f) roadbed construction quality inspection; g) subgrade handover acceptance; and before subgrade handover acceptance in the step G, the construction from the step C to the step F is repeated to form an embankment, so that the top of the subgrade which is subjected to layered filling and tamping is used for arranging a pavement. According to the construction method of the construction waste roadbed, the construction quality of the construction waste roadbed is guaranteed by controlling the construction waste roadbed rolling machine combination, the technological parameters, the compaction degree, the PFWD modulus and the rebound deflection value of a special layer, and a construction waste roadbed filling layer filler selection method is provided. Therefore, the safety and the stability of the construction waste roadbed structure including the road surface are protected.

Description

Technical Field

[0001] The invention relates to the technical field of roadbed construction, and in particular to a construction method for a building waste roadbed. Background Art

[0002] As of now, China's urbanization rate has reached 65%, and the output of construction waste is increasing day by day. The stock of construction waste is huge and easy to obtain. If it can be made into a good road construction material and used in road engineering, it will have a good economic, environmental and application prospect for China's transportation industry.

[0003] With the continuous improvement of China's highway network, there are still many new and pending highways. In this context, the demand for sand and gravel materials is very strong, but the environmental protection situation is becoming increasingly severe. The ban and restriction policies on river sand and mines have made the supply of sand and gravel resources in various parts of the country insufficient to meet the demand, and the price has been rising. Therefore, using construction waste recycled materials as roadbed fillers can solve the problems of environmental pollution caused by mountain quarrying, and is a powerful measure to promote the greening of transportation infrastructure and the resource utilization of solid waste.

[0004] Recycled materials from construction waste are similar to "soil-rock mixture". Compared with ordinary roadbed fillers, recycled materials from construction waste have significant characteristics: complex composition, large variability of components, low strength of mortar and bricks in recycled materials, and easy to break. Due to some characteristics of recycled materials from construction waste that are different from ordinary fillers, it is difficult to accurately evaluate the construction quality of construction waste roadbeds. Compactness, a commonly used roadbed compaction quality control indicator, can accurately judge the quality of roadbed construction for ordinary fill roadbeds with homogeneous roadbed fillers, but it is more difficult to judge the quality of roadbed compaction for construction waste roadbeds. Even if it is the same batch of recycled materials from construction waste, if its gradation and components are not strictly controlled, the test results of compaction may also be extremely discrete, and the compaction on site is difficult to measure. The evaluation of compaction indicators is not very operational and the test efficiency is low. Some projects use experimental engineering detection methods, such as settlement difference and rolling times. Although the results are relatively reliable, the method itself is not rigorous enough and lacks unified quantitative indicators. It relies more on construction experience and judgment. The results are only applicable to a certain area and a certain material and are not suitable for large-scale promotion. The indicators of the resistance detection method, such as elastic modulus, foundation coefficient plasticity, deformation modulus, etc., require professional operation. Usually, the required instruments have high precision and sensitivity and need to be constantly calibrated and carefully maintained.

[0005] The existing Huzhou-Zhoushan-Meizhou Expressway project requires more than 12 million cubic meters of construction waste to fill the roadbed. How to control the construction quality of the construction waste roadbed is crucial. How to comprehensively evaluate the construction quality of the construction waste roadbed plays a very important role in the promotion and application of soil-rock mixed filling roadbeds such as construction waste roadbeds. The technical results obtained from the test section of the Huzhou-Zhoushan-Meizhou Expressway will guide the large-scale construction of the entire Huzhou-Zhoushan-Meizhou Expressway and improve the construction quality of the Huzhou-Zhoushan-Meizhou Expressway roadbed. Summary of the invention

[0006] At least one of the purposes of the present invention is to provide a construction method for a construction waste roadbed, which is similar to a soil-rock mixed fill roadbed and is difficult to evaluate in terms of compaction quality. The construction method for a construction waste roadbed ensures the construction quality of the construction waste roadbed by controlling the combination of construction waste roadbed rolling machinery and process parameters, compaction degree, dynamic deformation modulus and rebound deflection value of special layers, thereby protecting the safety and stability of the construction waste roadbed structure including the road surface.

[0007] In order to achieve the above object, the present invention adopts the following technical solution: The present invention provides a construction waste roadbed construction method, which comprises the following steps: Step A: Construction preparation: Before construction, check the source and quality of recycled construction waste materials. The source, variety and quality of recycled construction waste materials entering the site should meet the requirements. Materials that do not meet the requirements shall not be allowed to enter the site. Take samples of the recycled construction waste materials transported to the site in three layers: upper, middle and lower. Determine the brick content and stone content of the recycled construction waste materials before paving. According to the brick content and stone content on site, find the optimal moisture content and maximum dry density of the recycled construction waste materials under the corresponding brick content and stone content measured by the indoor standard compaction experiment. Measure the water absorption rate of the recycled construction waste materials on site, and use this as the basis for calculating the theoretical maximum dry density of the on-site compaction quality and the amount of water to be sprinkled on site. Step B: Substrate treatment: All trees and shrubs within the building red line shall be cut down and transported out of the site, the soil layer on the top of the soil foundation shall be cleaned, and the humus soil, surface bark, grass, tree roots and domestic garbage on the original ground shall be transported to the abandoned soil site for centralized stacking; after the roadbed base is cleaned, the base shall be fully rolled; Step C: Paving and leveling: Before paving, the construction surface is divided into 5m*10m squares and the squares are marked with lime; the filling height of each layer of the embankment and roadbed is 35cm and 30cm respectively. After unloading according to the above squares, a bulldozer is used immediately for initial leveling. After initial leveling, a single steel wheel roller is used for 1-2 times of steady pressure. For local segregated parts, fine aggregates of construction waste are used for manual leveling, potholes are filled, and elevation is controlled to achieve the purpose of surface flatness; Step D: Sprinkle water and suffocate the material: The watering process is divided into two times. The amount of water to be sprinkled is the value of the optimal moisture content of the recycled construction waste material minus its water absorption rate. The first watering is 60%-70% of the required water volume. After watering, the material is stuffed. After 2-4 hours, several points are dug for inspection. When the penetration depth exceeds 3 / 4 of the thickness and there is no large area of ​​water accumulation on the roadbed surface, a sheep horn roller is used to stabilize the pressure 1-2 times; then the second water is sprayed, and the amount of water to be sprinkled is 30%-40% of the required water volume. After sprinkling, a sheep horn roller can be used for re-compaction to allow the water to continue to infiltrate during the vibration rolling process, and then a grader is used to scrape it flat, and the material is stuffed for 2-4 hours with a non-stick wheel as the degree, and then a steel wheel roller is used for final compaction; Step E: rolling: Before rolling the roadbed, check the thickness, flatness, moisture content of the fill layer and the width of the roadbed. Roll the roadbed only if they meet the predetermined requirements. When rolling the roadbed, perform the first static compaction, which is slow at first and fast later, and weak vibration at first and strong vibration later. The maximum speed of the roller shall not exceed 4km / h. The compaction routes shall be parallel to each other longitudinally. The straight sections shall be rolled from both sides to the center of the roadbed, and the curved sections shall be rolled from the inside to the outside of the curve. The transverse joints shall overlap by 0.4-0.5m, and the front and rear adjacent sections shall overlap longitudinally by 2.0-5.0m. When rolling, follow the principles of light first and heavy later, slow first and fast later, static first and dynamic later, and overlapping wheel tracks.

[0008] Step F: Roadbed construction quality inspection: After each layer of filler is compacted, the compacted roadbed is inspected according to the evaluation criteria of compaction degree, PFWD modulus and rebound deflection value of key layers; Step G: acceptance inspection of roadbed; Before the roadbed in step G is handed over for inspection, the construction of steps C to F is repeated to form a construction waste roadbed, so that the layered and compacted construction waste roadbed is used for arranging the road surface.

[0009] As a further solution of the present invention, when the roadbed is rolled in step E, when the construction waste fill roadbed is rolled, the compacting machinery used is a 26t single steel wheel roller and a 26t ram horn roller.

[0010] As a further solution of the present invention, during the rolling in step E, when the layer is in the roadbed structure of the construction waste fill roadbed, the initial compaction adopts a 26t single steel wheel roller to perform static compaction once, and the secondary compaction adopts a 26t ram horn roller to perform strong vibration twice and weak vibration three times, and then a 26t single steel wheel roller is used to perform weak vibration once and strong vibration three times, and the final compaction adopts a 26t single steel wheel static compaction once; when the layer is in the roadbed structure of the construction waste fill roadbed, the initial compaction adopts a 26 The 26t single steel wheel was used for static compaction once, and the re-compaction was carried out by a 26t ram horn roller with strong vibration twice and then weak vibration twice. Then a 26t single steel wheel roller was used for weak vibration once and then strong vibration three times. The final compaction was carried out by a 26t single steel wheel for static compaction twice and then finishing once. The speed gear of the above-mentioned rollers was 1st gear. The combination of construction waste roadbed compaction machinery and process parameters were obtained through the roadbed test road of the HZM-C03 contract section of Shaanxi Huyi-Zhouzhi Meixian Expressway.

[0011] As a further solution of the present invention, during the quality management and acceptance of step F, the rebound deflection value of the key layer of the construction waste roadbed is used to control the construction quality of the construction waste fill roadbed, and the compaction degree and PFWD modulus are used to control the compaction quality during the construction of the construction waste fill roadbed.

[0012] As a further solution of the present invention, the rebound deflection value is measured by using a Beckman beam, and the length of the Beckman beam is 5.4m; the key layers of the construction waste fill roadbed are the top surface of the lower embankment, the top surface of the upper embankment and the top surface of the lower roadbed.

[0013] As a further solution of the present invention, the setting of the rebound deflection value control standard of the key layer of the construction waste fill roadbed takes into account the construction waste roadbed design documents and theoretical calculation results; the theoretical calculation model adopts an elastic half-space layered system.

[0014] As a further solution of the present invention, when using the compaction degree to control the construction quality of the construction waste roadbed and when determining the maximum dry density of the construction waste recycled material, the influence of the stone content and the brick content on the maximum dry density of the filler is considered at the same time.

[0015] As a further solution of the present invention, during paving and leveling in step C, the filling material of the roadbed of the construction waste filling layer should be selected according to the design nomogram of the filling material of the roadbed of the construction waste filling layer.

[0016] As a further solution of the present invention, during paving and leveling in step C, the maximum loose paving thickness of the construction waste fill embankment portion is less than 35 cm, and the maximum loose paving thickness of the construction waste roadbed portion is less than 30 cm.

[0017] As a further solution of the present invention, when selecting construction waste recycled materials as roadbed filler, the stone content of the construction waste recycled materials, that is, the mass percentage of recycled materials with a particle size of more than 4.75 mm in the total construction waste recycled materials is between 50% and 60%; the brick content, that is, the mass of bricks in the construction waste recycled materials accounts for 0% to 30% of the total mass of the construction waste recycled materials; the rebound modulus value of the construction waste recycled materials meets the rebound modulus value of the layer to be filled.

[0018] In summary, due to the adoption of the above technical solution, the present invention has at least the following beneficial effects: 1. By controlling the stone content and brick content of each layer of the roadbed filler made of recycled construction waste, the roadbed can be compacted and settled evenly; by controlling the loose laying thickness of the layered roadbed filler made of recycled construction waste, the compaction degree of the roadbed can reach the predetermined requirements, thereby enhancing the stability of the roadbed; 2. By considering the influence of stone content and brick-concrete ratio on the maximum dry density of construction waste recycled materials, the compaction index is made more accurate and better represents the compaction quality of construction waste roadbed; 3. By combining the compaction machinery combination and process parameters obtained from the test section, the construction parameters of different layers are determined, and the construction waste roadbed is rolled in layers to make the construction waste roadbed firm and avoid collapse, thereby increasing the stability of the roadbed and ensuring the stability of construction quality; 4. The construction quality of the construction waste roadbed is controlled by construction control indicators such as compaction degree, PFWD modulus and rebound deflection value of key layers, ensuring the safety and stability of the construction waste roadbed, which plays a very important role in the promotion and application of soil-rock mixed roadbed such as construction waste roadbed. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0020] Figure 1 Flow chart for construction waste roadbed construction Figure 2 Theoretical calculation flow chart of rebound bending settlement value of key layers of construction waste roadbed Figure 3 Flowchart for selecting filling materials for roadbed of construction waste Figure 4 Design of Nomograph for Construction Waste Roadbed Filling Layer DETAILED DESCRIPTION

[0021] The following is a further detailed description of the construction waste roadbed structure and construction method of the present invention in conjunction with the accompanying drawings and embodiments, so that the purpose, technical solutions and advantages of the present invention are more clearly understood. 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.

[0022] Example 1, the present invention discloses a construction method of a construction waste roadbed of an exemplary embodiment, such as Figure 1 As shown, the construction method includes the following steps: A) construction preparation; B) base treatment; C) paving and leveling; D) watering and stuffing; E) rolling; F) roadbed construction quality inspection; G) roadbed completion acceptance; each step is explained in detail below.

[0023] Construction preparation Before construction, the source and quality of construction waste recycled materials should be checked. The source, variety and quality of construction waste recycled materials entering the site should meet the requirements. Materials that do not meet the requirements shall not be allowed to enter the site. The brick content and stone content of the construction waste recycled materials before paving are determined by sampling the quality of the upper, middle and lower layers of the construction waste recycled materials transported to the site by the transport vehicle. According to the brick content and stone content on site, the optimal moisture content and maximum dry density of the construction waste recycled materials under the corresponding brick content and stone content measured by the indoor standard compaction experiment are found. At the same time, the water absorption rate of the construction waste recycled materials on site is measured, which is used as the basis for calculating the theoretical maximum dry density of the on-site compaction quality and the amount of watering on site.

[0024] Substrate treatment All trees and shrubs within the building red line will be cut down and transported out of the site; the soil layer on the top of the soil foundation, including the humus soil, surface skin, grass, tree roots, and domestic garbage on the original ground, will be transported to the abandoned soil site for centralized stacking; after the roadbed base is cleaned, the base will be fully rolled. After the base is rolled, the compaction degree will be tested, and after passing the test, the construction waste roadbed will be filled.

[0025] Paving and leveling Before paving, the construction surface is divided into 5m*10m squares and the squares are marked with lime. The filling material of the roadbed of construction waste filling layer is selected according to the design model diagram of the filling material of the roadbed of construction waste filling layer. The filling height of each layer of the embankment and the roadbed is 35cm and 30cm respectively. After unloading according to the above grid, a bulldozer is used for initial leveling immediately. After initial leveling, a single steel wheel roller is used to stabilize the pressure 1 to 2 times. For the local segregation parts, fine aggregates of construction waste are used for leveling, potholes are filled, and the elevation is controlled to achieve the purpose of surface flatness. The grader should be finely leveled according to the loose paving elevation control pile (the loose paving coefficient should be adjusted according to the actual rolling thickness on site). When leveling, the middle should be kept high and the sides should be low along the longitudinal direction of the route, and the aggregate should be scraped from both sides of the road to the center to avoid the concentration of aggregate at the junction of the filling material and the edge soil. The horizontal slope required by the design is formed, and there is no obvious misalignment and potholes on the roadbed surface after leveling. The loose paving thickness of the construction waste roadbed filling material should be measured in time after leveling. If the requirements are not met, a grader should be used immediately to continue leveling until the requirements are met.

[0026] Sprinkling water, stuffing Strictly controlling the moisture content of construction waste recycled materials is an especially important key link in the construction of construction waste roadbed. Due to the particularity of the composition of construction waste recycled materials, bricks, mortar blocks, etc. are loose and porous structures with high porosity, which directly leads to a high water absorption rate of recycled materials. At the same time, due to the heterogeneity of the material composition, water absorption of recycled materials is a relatively slow process. The time required for water absorption of recycled materials should be strictly controlled during the construction process. Therefore, in order to ensure the quality of roadbed rolling, the watering process is carried out twice for the uniformity of watering of the filler. The amount of watering is the value of the optimal moisture content of the construction waste recycled materials minus its water absorption rate. The first watering is about 60%~70% of the required water volume (generally slightly larger than the theoretical value, adjusted according to the on-site temperature). After watering, the material is stuffed. After 2~4 hours, several points are dug for inspection. When the penetration depth exceeds 3 / 4 of the thickness and there is no large area of ​​water accumulation on the roadbed surface, the sheep horn roller is used to stabilize the pressure 1~2 times. Then spray the second water, and the amount of watering is about 30%~40% of the required water volume. After sprinkling, you can use a sheep horn roller for re-compaction, so that the water continues to seep in the process of vibration rolling, then use a grader to level it, continue to stuff the material for 2 to 4 hours (adjust according to the site conditions, so that the wheels do not stick), and then use a steel wheel roller for final compaction.

[0027] Rolling Before rolling the roadbed, check the thickness, flatness, moisture content and roadbed width of the fill layer. Roll the roadbed after it meets the predetermined requirements. When rolling the roadbed, use a 26t single steel wheel roller for the first static compaction. The static compaction is slow first and then fast, and the weak vibration is first and then the strong vibration. The maximum speed of the roller is no more than 4km / h. The compaction routes are parallel to each other in the longitudinal direction. The straight sections are rolled from both sides to the center of the roadbed, and the curved sections are rolled from the inside to the outside of the curve. The transverse joints should overlap by 0.4~0.5m, and the longitudinal overlap between the two adjacent sections should be 2.0~5.0m. When rolling, follow the principles of light first and heavy later, slow first and then fast, static first and then dynamic, and overlapping wheel tracks. The number of times the construction waste roadbed is rolled should be based on the compaction machinery combination and construction parameters provided by the test section.

[0028] Roadbed construction quality inspection After each layer of filler is compacted, the compacted roadbed is inspected according to the evaluation criteria (compaction degree, PFWD modulus and rebound deflection value of key layers). The compaction degree is not less than 96% within a depth of 0 to 80 cm below the top surface of the roadbed, not less than 94% within a depth of 80 to 150 cm below the top surface of the roadbed, and not less than 93% when the depth is greater than 150 cm below the top surface of the roadbed; the PFWD modulus is greater than 40 MPa in the roadbed part of the construction waste roadbed, and the PFWD modulus is greater than 30 MPa in the embankment structure part of the construction waste roadbed. The width of each compacted filling layer is not less than the predetermined width. For the filling section with a height greater than 12 m, the roadbed is impact rolled once every 2 m to ensure the overall stability and compaction quality of the roadbed. Specifically, when the roadbed is filled to the key layer of the construction waste roadbed, the construction quality inspection project of the key layer of the construction waste roadbed should be supplemented with the inspection of the rebound deflection value. The control standard should not only meet the requirements of the theoretical calculation documents but also correspond to the roadbed design documents. Specifically, the theoretical calculation process of the rebound deflection value of the key layer of the construction waste roadbed is as follows: Figure 2 As shown in the figure, the specific process is as follows: first, the foundation soil parameters, construction waste recycled material parameters, roadbed structure parameters and the design value of the equivalent rebound modulus of the roadbed top surface are determined through the design documents of the construction waste roadbed pavement, relevant geological reports and relevant literature. The theoretical calculation value of the rebound deflection of the key layer of the construction waste roadbed is obtained based on the elastic layered system model. Combining the theoretical calculation results with the actual engineering design documents, the control requirements for the rebound deflection value of the key layer of the construction waste roadbed are obtained. The rebound deflection value of the key layer of the construction waste roadbed needs to meet the following requirements: the rebound deflection value of the top surface of the roadbed is less than 100 (0.01mm), the rebound deflection value of the top surface of the upper embankment is less than 130 (0.01mm), and the top surface of the lower embankment is less than 160 (0.01mm). The unqualified roadbed is re-pressed until it is qualified; after the inspection is qualified, a random inspection is carried out, and the filling construction of the next layer or section of the roadbed is carried out after the random inspection is qualified.

[0029] Roadbed completion acceptance After the completion of the roadbed project, the roadbed surface should be flat, dense, and without obvious segregation. Rigorous quality inspection is required for the acceptance of the construction waste roadbed filling material, including comprehensive inspection and evaluation of the roadbed filling material. If necessary, a third-party organization can be entrusted to conduct inspection and appraisal to ensure that the construction quality meets the engineering standards and design requirements.

[0030] Embodiment 2, Figure 3 The present invention shows the process of selecting filler materials for the roadbed to be filled in the filling layer. The roadbed filler selection process is as follows: 1) selection of the material modulus of the construction waste recycled material; 2) selection of the equivalent rebound modulus value of the construction surface; 3) theoretical calculation; 4) drawing of the design model diagram of the filler material for the roadbed filling layer of the construction waste; 5) determination of the material modulus of the roadbed filler material for the filling layer to be filled. Each step is described in detail below.

[0031] Selection of modulus of filling material The material modulus of construction waste recycled materials is estimated according to the CBR value of construction waste recycled materials, and several more reasonable material modulus values ​​(40MPa, 50MPa, 60MPa, 70MPa) are selected as calculation parameters.

[0032] Selection of the value of the elastic modulus of the construction surface According to the geological report, construction waste roadbed design documents and previous theoretical calculation results, the equivalent rebound modulus values ​​of the construction surface (20MPa, 30MPa, 40MPa) and the target equivalent rebound modulus of the roadbed top surface (50MPa) that may appear during the construction of the construction waste roadbed were selected.

[0033] Theoretical calculations Based on the elastic half-space layered system theory and the displacement equivalence principle, the rebound deflection values ​​corresponding to the construction waste recycled materials with different material moduli, the equivalent rebound modulus of the construction surface and the thickness of the filling layer are calculated.

[0034] Drawing of the Nomograph for the Design of Filling Material for Roadbed Filling Layer Made of Construction Waste Combined with the theoretical calculation results, the change of the equivalent elastic modulus of the construction waste recycled material with a certain material modulus under a certain construction surface top surface equivalent elastic modulus is analyzed with the thickness of the filling layer. The change curves of the construction waste recycled material with each material modulus under a certain condition are summarized into a figure, which is the design model diagram of the filling material of the construction waste roadbed filling layer, such as Figure 4 shown.

[0035] Determination of recycled materials from construction waste in the filling layer By determining the equivalent elastic modulus of the top surface of the roadbed construction layer, the thickness of the layer to be filled, and the target equivalent elastic modulus of the top surface of the roadbed, and further combining the drawn design nomenclature of the filling material of the construction waste roadbed filling layer, the range of the material modulus of the construction waste recycled material to be filled is determined. Assuming that the equivalent elastic modulus of the construction layer is 40MPa, the thickness of the layer to be filled is 0.5m, and the target equivalent elastic modulus of the top surface of the roadbed is 50MPa, it can be seen from the design nomenclature of the filling material of the construction waste roadbed filling layer that the material modulus of the construction waste recycled material to be filled must be greater than 60MPa.

[0036] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A construction waste roadbed construction method, characterized in that: The steps include: Step A: Construction preparation: Before construction, check the source and quality of recycled materials from construction waste. The source, variety and quality of recycled materials from construction waste entering the site must meet the requirements. Materials that do not meet the requirements shall not be allowed to enter the site. Take samples of the construction waste recycled materials transported to the site in three layers: upper, middle and lower, and determine the brick content and stone content of the construction waste recycled materials before paving. According to the brick content and stone content on site, find the optimal moisture content and maximum dry density of the construction waste recycled materials under the corresponding brick content and stone content measured by the indoor standard compaction experiment, and measure the water absorption rate of the construction waste recycled materials on site, which will be used as the basis for calculating the theoretical maximum dry density of the on-site compaction quality and the amount of water to be sprinkled on site; Step B: Substrate treatment: All trees and shrubs within the building red line shall be cut down and transported out of the site, the soil layer on the top of the soil foundation shall be cleaned, and the humus soil, surface bark, grass, tree roots and domestic garbage on the original ground shall be transported to the abandoned soil site for centralized stacking; after the roadbed base is cleaned, the base shall be fully rolled; Step C: Paving and leveling: Before paving, the construction surface is divided into 5m*10m squares and the squares are marked with lime; the filling height of each layer of the embankment and roadbed is 35cm and 30cm respectively. After unloading according to the above squares, a bulldozer is used immediately for initial leveling. After initial leveling, a single steel wheel roller is used for 1-2 times of steady pressure. For local segregated parts, fine aggregates of construction waste are used for manual leveling, potholes are filled, and elevation is controlled to achieve the purpose of surface flatness; Step D: Sprinkle water and suffocate the material: The watering process is divided into two times. The amount of water to be sprinkled is the value of the optimal moisture content of the recycled construction waste material minus its water absorption rate. The first watering is 60%-70% of the required water volume. After watering, the material is stuffed. After 2-4 hours, several points are dug for inspection. When the penetration depth exceeds 3 / 4 of the thickness and there is no large area of ​​water accumulation on the roadbed surface, a sheep horn roller is used to stabilize the pressure 1-2 times; then the second water is sprayed, and the amount of water to be sprinkled is 30%-40% of the required water volume. After sprinkling, a sheep horn roller can be used for re-compaction to allow the water to continue to infiltrate during the vibration rolling process, and then a grader is used to scrape it flat, and the material is stuffed for 2-4 hours with a non-stick wheel as the degree, and then a steel wheel roller is used for final compaction; Step E: rolling: Before rolling the roadbed, check the thickness, flatness, moisture content and width of the fill layer, and roll the roadbed after it meets the predetermined requirements; when rolling the roadbed, first perform the first static compaction, which is slow at first and then fast, and weak vibration at first and then strong vibration; the maximum speed of the roller rolling shall not exceed 4km / h; the compaction routes shall be parallel to each other in the longitudinal direction, and the straight sections shall be rolled from both sides to the center of the roadbed, and the curved sections shall be rolled from the inside to the outside of the curve; the transverse joints shall overlap by 0.4-0.5m, and the longitudinal overlap between the two adjacent sections shall be 2.0-5.0m. When rolling, follow the principles of light first and then heavy, slow first and then fast, static first and then dynamic, and overlapping wheel tracks; Step F: Roadbed construction quality inspection: After each layer of filler is compacted, the compacted roadbed is inspected according to the evaluation criteria of compaction degree, PFWD modulus and rebound deflection value of key layers; Step G: acceptance inspection of roadbed; Before the roadbed in step G is handed over for inspection, the construction of steps C to F is repeated to form a construction waste roadbed, so that the layered and compacted construction waste roadbed is used for arranging the road surface.

2. The construction method of building waste filling roadbed according to claim 1, characterized in that: When the roadbed is rolled in step E, when the construction waste fill roadbed is rolled, the compacting machinery used is a 26t single steel wheel roller and a 26t ram horn roller.

3. The construction method of building waste filling roadbed according to claim 2, characterized in that: During the rolling in the step E, when the layer is in the embankment structure of the roadbed filled with construction waste, the initial compaction adopts a 26t single steel wheel roller to statically compact once, and the secondary compaction adopts a 26t ram horn roller to first strongly vibrate twice and then weakly vibrate three times, and then a 26t single steel wheel roller is used for weak vibration once and then strong vibration three times, and the final compaction adopts a 26t single steel wheel to statically compact once; when the layer is in the roadbed structure of the roadbed filled with construction waste, the initial compaction adopts a 26t single steel wheel to statically compact once, and the secondary compaction adopts a 26t ram horn roller to first strongly vibrate twice and then weakly vibrate two times, and then a 26t single steel wheel roller is used for weak vibration once and then strong vibration three times, and the final compaction adopts a 26t single steel wheel to statically compact twice and then finish once, and the driving speed gear of the above rollers are all in gear 1, and the combination of construction waste roadbed compaction machinery and process parameters are all obtained through the roadbed test road of the HZM-C03 contract section of Shaanxi Huyi Zhouzhi Meixian Expressway.

4. The construction method of building waste filling roadbed according to claim 1, characterized in that: During the quality management and acceptance of step F, the rebound deflection value of the key layer of the construction waste roadbed is used to control the construction quality of the construction waste fill roadbed, and the compaction degree and PFWD modulus are used to control the compaction quality during the construction of the construction waste fill roadbed.

5. The construction method of building waste filling roadbed according to claim 4, characterized in that: The rebound deflection value is measured by using a Beckman beam, and the length of the Beckman beam is 5.4m; the key layers of the construction waste fill roadbed are the top surface of the lower embankment, the top surface of the upper embankment and the top surface of the lower roadbed.

6. The construction method of building waste filling roadbed according to claim 4, characterized in that: The setting of the rebound deflection control standard of the key layer of the construction waste fill roadbed takes into account both the construction waste roadbed design documents and the theoretical calculation results; the theoretical calculation model adopts an elastic half-space layered system.

7. The construction method of building waste filling roadbed according to claim 4, characterized in that: When using the compaction degree to control the construction quality of the construction waste roadbed and when determining the maximum dry density of the construction waste recycled materials, the influence of the stone content and the brick content on the maximum dry density of the filler is considered at the same time.

8. The construction waste roadbed construction method according to claim 1, characterized in that: During paving and leveling in step C, the filling material of the roadbed of the construction waste filling layer should be selected according to the design nomenclature of the filling material of the roadbed of the construction waste filling layer.

9. The construction waste roadbed construction method according to any one of claims 1 to 6, characterized in that: During paving and leveling in step C, the maximum loose paving thickness of the construction waste embankment portion is less than 35 cm, and the maximum loose paving thickness of the construction waste roadbed portion is less than 30 cm.

10. The construction waste roadbed construction method according to any one of claims 1 to 6, characterized in that: When selecting recycled materials from construction waste as roadbed filling materials, the stone content of the recycled materials from construction waste, that is, the mass percentage of recycled materials with a particle size of 4.75 mm or above, is between 50% and 60% of the total mass of recycled materials from construction waste; the brick content, that is, the mass of bricks in the recycled materials from construction waste accounts for 0% to 30% of the total mass of recycled materials from construction waste; the rebound modulus of the recycled materials from construction waste meets the rebound modulus of the layer to be filled.

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