Road intersection construction method based on BIM model

Abstract

The invention relates to a road intersection construction method based on a BIM model. The method comprises the steps that S1, the BIM model is established; s2, correcting the BIM model; s3, roadbed construction; s4, constructing a cushion layer; s5, construction of a base layer; s6, curbstone construction; s7, surface layer construction; s8, carrying out marking construction; according to the method, the BIM three-dimensional model of the road intersection is established through the BIM technology according to the vertical design drawing of the intersection, then the BIM three-dimensional model is connected with the intelligent measurement lofting equipment for real-time lofting, the elevation of a structural layer of the road intersection is monitored and adjusted in real time, smoothness and attractiveness of a transition section of the intersection are guaranteed, the elevation of the intersection after construction meets the design requirement, and the construction efficiency is improved. And the elevation deviation meets related specification requirements.

Description

Technical Field

[0001] The present invention relates to the technical field of road construction, and in particular to a road intersection construction method based on a BIM model. Background Art

[0002] With the development of urban construction and the improvement of people's living standards, there are more and more vehicles in cities. However, the intensity and quality of urban road construction often cannot keep up with the speed of urban development. During the road construction process, the construction of road intersections has always been a difficult point in road construction, mainly in the elevation control during the construction of road intersections.

[0003] At present, when constructing urban road intersections, it is usually necessary to mark reference points at the road intersections according to the design drawings provided by the design institute, mark multiple control points on the road intersection edge lines, circular curves, etc., and hang lines between the reference points and the control points according to the elevations in the vertical design drawings of the road intersections provided by the design institute, and use the hanging lines to control the elevation of the road intersection.

[0004] However, the vertical design drawing of the road intersection is a plane drawing, which cannot directly reflect whether the elevation of each control point can smoothly transition, the conflict of the horizontal and vertical slopes of the road, the straightness of the road intersection, and the uneven transition of the curve, which directly affects the smoothness of the road intersection after the construction is completed. The elevation can only be controlled by hanging lines, and the elevation of the control points at both ends of the line can only be guaranteed. The elevation of the middle part is difficult to control and the construction accuracy is difficult to ensure. After the construction of the road structure layer is completed, the local elevation often does not match the design elevation, resulting in an uneven road surface after the construction is completed, affecting people's requirements for road comfort. Summary of the invention

[0005] In view of this, in order to overcome the shortcomings of the prior art problems, the present invention provides a road intersection construction method based on the BIM model, the method is to establish a BIM three-dimensional model of the road intersection according to the vertical design drawing of the intersection through BIM technology, and then connect the BIM three-dimensional model to the intelligent measurement and layout equipment for real-time layout, real-time monitoring and adjustment of the elevation of the road intersection structure layer, to ensure that the transition section of the intersection is smooth and beautiful, so that the elevation of the intersection after construction meets the design requirements, and the elevation deviation meets the requirements of relevant specifications.

[0006] To achieve the above purpose, the technical solution provided by the present invention is: A road intersection construction method based on a BIM model, comprising the following construction steps: S1. Construct a BIM model of the road intersection according to the vertical design drawing of the road intersection; S2. Modify the BIM model Correct the straightness of road intersections in the BIM model, the uneven transition of curves, the uneven transition of local elevations, and the conflict between the horizontal and vertical slopes of the road; S3. Roadbed construction S31, positioning and setting out Determine the on-site layout points and control points of the road intersection from the revised BIM model, and use intelligent surveying and layout equipment to layout the road intersection to form the construction area of ​​the road intersection. S32, Excavation of roadbed trench Dig out the soil and rocks in the construction area and roll and compact them to form a soil base; S33, roadbed trench backfilling Spread backfill soil in the roadbed trench, repair the road crown, and compact it by rolling to form the roadbed; S4. Pad construction S41. Use intelligent measurement and layout equipment to measure the actual elevation of each control point on the roadbed surface, and import the data into the BIM model. Adjust the BIM model according to the actual elevation of each control point on the roadbed surface, and obtain the amount of cushion filler and the stacking position of each vehicle cushion filler from the adjusted BIM model; S42, transporting and stacking cushion fillers, and spreading, rolling and compacting the stacked cushion fillers to form a cushion layer; S5. Base construction S51, using intelligent measurement and layout equipment to measure the actual elevation of the cushion surface of each control point, and importing the measurement data into the BIM model, adjusting the BIM model according to the actual elevation of each control point on the cushion surface, obtaining the amount of base filler from the adjusted BIM model, and determining the layout point from the adjusted BIM model; S52, using intelligent surveying and staking equipment to stake out the roadbed surface; S53, spread the base filler on the roadbed surface and compact it by rolling; S54, check the compaction degree, and complete the base construction after the compaction degree meets the design requirements; S6, curb construction S61. Use intelligent measurement and layout equipment to measure the actual elevation of the base surface of each control point, import the measurement data into the BIM model, adjust the BIM model according to the measurement data, and obtain the amount of side stones and curb stones, side stones and curb stone control points and layout points from the adjusted BIM model; S62, using intelligent measurement and layout equipment to lay out on the surface of the base layer to form an installation area for side flat stones and curb stones; S63, dig a groove on the surface of the base, level the bottom of the groove, and manually install side stones and curbstones in the groove to form curbs; S7, surface construction S71, determining the surface layer lofting points from the BIM model adjusted in step S61, and lofting on the surface of the base layer using an intelligent measurement and lofting device; and obtaining the amount of surface layer filler from the adjusted BIM model; S72, evenly spread the surface filler and compact it by rolling; S73. Check the compaction degree and complete the surface layer construction after the compaction degree meets the design requirements; S8, road marking construction Intelligent surveying and setting out equipment is used to set out traffic markings on the surface layer according to the BIM model, and finally traffic marking construction equipment is used to draw traffic markings on the surface layer; The construction of the road intersection is now completed.

[0007] Furthermore, in step S33, when the roadbed trench is backfilled, the elevation of each control point on the surface of the soil base is firstly re-measured using intelligent measurement and setting-out equipment, and the data is imported into the BIM model, and the amount of backfill soil used for the roadbed trench and the stacking position of each truck of backfill soil are obtained from the BIM model; Then, after the backfill soil is piled up at the corresponding position, the backfill soil is spread by a grader and the road crown is repaired; Then, the intelligent surveying and setting out equipment is used to measure the elevation of each control point on the surface of the loose backfill soil, and the elevation data is imported into the BIM model. The BIM model analyzes whether the elevation of each control point meets the design requirements and gives the data for reducing or replenishing materials. The materials are manually reduced or replenished based on the data. After the elevations of all control points on the backfill soil surface meet the design requirements, the soil is compacted mechanically. After the compaction degree meets the design requirements, the roadbed construction is completed.

[0008] Furthermore, during the cushion construction in step S4, the cushion is constructed in a layered manner, and the elevation of the control point of each cushion layer, the amount of cushion filler in each cushion layer, and the stacking position of cushion filler for each vehicle in each cushion layer are obtained from the adjusted BIM model; The cushion filler is spread layer by layer from bottom to top. After each layer of cushion filler is spread, the elevation of each control point on the surface of the loosely laid cushion filler is measured by intelligent measuring and layout equipment, and the elevation data is imported into the BIM model. The BIM model analyzes whether the elevation of each control point meets the design requirements, and gives the data for reducing or supplementing material. Material is manually reduced or supplemented based on the data. After the elevation of each control point on the surface of this layer meets the design requirements, it is compacted mechanically before the next layer of cushion filler is spread.

[0009] Furthermore, in the step S53, when spreading the base filler, a transport vehicle is used to assist the paver to evenly spread the base filler on the roadbed. The paving surface is required to be flat and have a specified road arch. Then, the loose thickness of the base layer and the surface elevation of the base layer at each detection point are detected by intelligent measurement and layout equipment, and the data is imported into the BIM model to analyze whether the elevation of each control point meets the design requirements. If necessary, material is manually reduced or supplemented, and rolling is performed only after the elevation of each control point meets the design requirements.

[0010] Furthermore, the base filler is a mixture of cement, lime, crushed stone, sand and water, and the particle size of the crushed stone is less than or equal to 10 mm.

[0011] Furthermore, during the curb construction in step S6, for the curb construction of the straight section of the road intersection, control points can be set at both ends and / or in the middle of the straight section, and the elevation and installation position of the side stones and curb stones of the straight section can be controlled by pulling lines at the control points; for the construction of side stones and curb stones in the curved section of the road intersection, the elevation and installation position of each side stone and curb stone can be monitored by intelligent measuring and layout equipment.

[0012] Furthermore, during the surface layer construction in step S7, the surface layer is one layer or multiple layers. When the surface layer is multiple layers, it is constructed layer by layer from bottom to top. After the filler of one layer is spread and rolled, the next layer is constructed.

[0013] Furthermore, when spreading the surface filler, a transport vehicle is used to assist the paver to evenly spread the surface filler on the base layer. The paving surface is required to be flat and have a specified road arch. Then, an intelligent measuring and layout equipment is used to detect the loose paving thickness of the surface layer and the surface elevation of the surface filler at each control point. The data is imported into the BIM model to analyze whether the elevation of each control point meets the design requirements. If necessary, material is manually reduced or supplemented. Rolling is performed only after the elevation of each control point meets the design requirements.

[0014] Furthermore, the intelligent measurement and layout equipment is a BIM layout robot.

[0015] The beneficial effects of the present invention are: 1. The present invention establishes a BIM three-dimensional model of a road intersection through BIM technology according to the vertical design drawing of the intersection, and then connects the BIM three-dimensional model to the intelligent measurement and layout equipment for real-time layout, and monitors and adjusts the elevation of the structural layer of the road intersection in real time to ensure that the transition section of the intersection is smooth and beautiful, so that the elevation of the intersection after construction meets the design requirements and the elevation deviation meets the requirements of relevant specifications.

[0016] 2. The present invention establishes a BIM model to intuitively reflect the designed road intersection conditions, which is convenient for discovering design deficiencies or defects in advance and correcting the BIM model so that the transition between straight and curved lines in the BIM model is smooth, the transition between local elevations is smooth, and the horizontal and vertical slopes of the road do not conflict and the transition is smooth. This can effectively solve the problem that the existing road surface unevenness cannot be discovered in advance during construction based on vertical design drawings.

[0017] 3. During the construction of the cushion layer, the base layer and the surface layer of the present invention, the BIM model is adjusted according to the actual elevation of each control point, and the construction is guided by the adjusted BIM model. The model is closely integrated with the actual construction, and the BIM model is adjusted in time according to the actual construction situation to avoid the accumulation of differences between the actual construction and the design, providing a basis for the elevation after the construction is completed to meet the design requirements.

[0018] 4. The construction method of the present invention is simple and easy to operate, has low construction cost, low difficulty in quality control, good appearance, and can effectively improve construction efficiency, shorten construction period, and reduce cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the construction process of the present invention. DETAILED DESCRIPTION

[0020] The present invention is further described in detail below in conjunction with the accompanying drawings: like Figure 1 As shown, a road intersection construction method based on a BIM model includes the following construction steps: S1. Construct a BIM model of the road intersection according to the vertical design drawing of the road intersection; S2. Modify the BIM model Correct the straightness of road intersections in the BIM model, the uneven transition of curves, the uneven transition of local elevations, and the conflict between the horizontal and vertical slopes of the road; S3. Roadbed construction S31, positioning and setting out Determine the on-site stakeout points and control points of the road intersection from the revised BIM model, and use the BIM stakeout robot to stake out the road intersection to form the road intersection construction area; In this embodiment, a BIM layout robot is used. In this embodiment, the center point of the road intersection is used as the reference point. The total station host of the BIM layout robot is set up at the reference point, and the corrected BIM model is imported into the field tablet computer. The layout points in the BIM model are selected through the tablet computer. The total station host emits an infrared laser to automatically aim at the layout points on the construction site, and the layout points are accurately reflected to the construction site. The layout is done by drawing lines with white lime according to the layout points.

[0021] S32, Excavation of roadbed trench Dig out the soil and rocks in the construction area and roll and compact them to form a soil base; The roadbed trench is excavated according to the geological conditions. In the marked construction area, the surface is cleaned, and the humus layer and soft soil layer in the construction area are excavated. If necessary, gravel is laid in the roadbed trench, and then the roadbed trench is compacted by a roller to form a soil base.

[0022] S33, roadbed trench backfilling Spread backfill soil in the roadbed trench, repair the road crown, and compact it by rolling to form the roadbed; First, the BIM layout robot measures the actual elevation of each control point on the soil base surface and imports the data into the BIM model. The amount of backfill soil for the roadbed trench and the stacking position of each truckload of backfill soil are obtained from the BIM model. Then, after the backfill soil is piled up at the corresponding position, the backfill soil is spread by a grader and the road crown is repaired; The BIM layout robot is then used to measure the elevation of each control point on the loose backfill surface, and the elevation data is imported into the BIM model. The BIM model analyzes whether the elevation of each control point meets the design requirements and provides material reduction or replenishment data, based on which material is manually reduced or replenished. After the elevations of all control points on the backfill soil surface meet the design requirements, the soil is compacted mechanically. After the compaction degree meets the design requirements, the roadbed construction is completed.

[0023] S4. Pad construction S41, using a BIM layout robot to measure the actual elevation of each control point on the roadbed surface, and importing the data into the BIM model, adjusting the BIM model according to the actual elevation of each control point on the roadbed surface, and obtaining the amount of cushion filler and the stacking position of each vehicle cushion filler from the adjusted BIM model; S42, transporting and stacking cushion fillers, and spreading, rolling and compacting the stacked cushion fillers to form a cushion layer; In this embodiment, the cushion layer is constructed in a layered manner, and the cushion layer is divided into an upper layer and a lower layer. The lower cushion layer and the upper cushion layer are constructed sequentially from bottom to top. First, the actual elevation of each control point on the roadbed surface is measured using a BIM layout robot, and the data is imported into the BIM model. The BIM model is adjusted according to the actual elevation of each control point on the roadbed surface, and the amount of cushion filler for the lower cushion layer and the stacking position of each vehicle cushion filler are obtained from the adjusted BIM model. When adjusting the BIM model, the lower end surface of the underlying layer in the BIM model is mainly adjusted to make the lower end surface of the underlying layer fit with the actual upper surface of the roadbed.

[0024] The cushion filler is transported and lowered into place with the assistance of the BIM layout robot. The cushion filler is spread by bulldozer and grader. The paving surface is required to be flat and have the specified road arch. After the lower cushion filler is spread, the BIM layout robot is used to measure the elevation of each control point on the surface of the loose cushion filler, and the elevation data is imported into the BIM model. The BIM model analyzes whether the elevation of each control point meets the design requirements and gives the data for reducing or supplementing material. The material is manually reduced or supplemented based on the data. After the elevation of each control point on the surface of this layer meets the design requirements, it is compacted with a roller.

[0025] The BIM layout robot is used again to measure the actual elevation of each control point on the surface of the lower cushion layer, and the data is imported into the BIM model. The BIM model is adjusted according to the actual elevation of each control point on the surface of the lower cushion layer, and the amount of cushion filler used in the upper cushion layer and the stacking position of each vehicle cushion filler are obtained from the adjusted BIM model; When adjusting the BIM model, mainly adjust the lower end surface of the upper cushion layer in the BIM model so that the lower end surface of the upper cushion layer fits with the upper surface of the actual lower cushion layer.

[0026] The cushion filler is transported and piled on the surface of the upper cushion layer with the assistance of the BIM layout robot. The cushion filler is spread by bulldozer and grader. The spread surface is required to be flat and have the specified road arch. After the upper cushion filler is spread, the BIM layout robot is used to measure the elevation of each control point on the surface of the loose cushion filler, and the elevation data is imported into the BIM model. The BIM model analyzes whether the elevation of each control point meets the design requirements and gives the data for reducing or supplementing material. The material is manually reduced or supplemented according to the data. After the elevation of each control point on the surface of this layer meets the design requirements, it is compacted by a roller to complete the cushion construction.

[0027] S5. Base construction S51, using the BIM layout robot to measure the actual elevation of the cushion surface of each control point, and import the measurement data into the BIM model, adjust the BIM model according to the actual elevation of each control point on the cushion surface, obtain the amount of base filler from the adjusted BIM model, and determine the layout point from the adjusted BIM model, When adjusting the BIM model, mainly adjust the lower end surface of the base layer in the BIM model so that the lower end surface of the base layer fits with the upper end surface of the actual cushion layer.

[0028] S52. Use the BIM layout robot to layout on the cushion surface; S53, spreading the base filler on the surface of the cushion layer and rolling and compacting it; The base filler is a mixture made by uniformly mixing 50 kg of cement, 300 kg of lime, 400 kg of crushed stone, 50 kg of sand and 50 kg of water in parts by weight, wherein the particle size of the crushed stone is less than or equal to 10 mm.

[0029] When paving the base filler, use a transport vehicle to assist the paver to evenly spread the base filler on the roadbed. The paving surface is required to be flat and have the specified road arch. Then, use the BIM layout robot to detect the loose paving thickness and surface elevation of the base at each test point, and import the data into the BIM model to analyze whether the elevation of each control point meets the design requirements. If necessary, manually reduce or add material, and roll it after the elevation of each control point meets the design requirements.

[0030] S54, check the compaction degree, and complete the base construction after the compaction degree meets the design requirements; S6. Curb Construction S61. Use a BIM layout robot to measure the actual elevation of the base surface of each control point, and import the measurement data into the BIM model. Adjust the BIM model according to the measurement data, and obtain the usage of side stones and curb stones, side stones and curb stone control points and layout points from the adjusted BIM model. For the curb construction of the straight section of the road intersection, control points are set at both ends of the straight section. For the curved section of the road intersection, the two ends and the middle point of each side stone and curb stone are used as control points. When adjusting the BIM model, the main thing is to adjust the lower end surface of the surface layer of the BIM model so that the lower end surface of the surface layer fits with the upper surface of the base layer.

[0031] S62, using a BIM layout robot to layout on the surface of the base layer to form an installation area for side flat stones and curb stones; S63. Dig a groove on the surface of the base layer and level the bottom of the groove. Manually install side stones and curbs in the groove. Pull lines at the control points at both ends of the straight section to control the elevation and installation position of the side stones and curbs in the straight section. For the construction of side stones and curbs in the curved section of the road intersection, the BIM layout robot can be used to monitor the elevation and installation position of each side stone and curb. After the side stones and curbs at the road intersection are installed, the curbs are formed.

[0032] S7, surface construction S71, determine the surface layer lofting points from the BIM model adjusted in step S61, and use the BIM lofting robot to loft on the surface of the base layer; and obtain the surface layer filler dosage from the adjusted BIM model, S72, evenly spread the surface filler and compact it. S73. Check the compaction degree and complete the surface layer construction after the compaction degree meets the design requirements; In this embodiment, the surface layer is divided into an upper layer, a middle layer and a lower layer from top to bottom. When the surface layer is constructed, the lower layer is constructed first, then the middle layer, and finally the upper layer.

[0033] When constructing the lower layer, use the BIM layout robot to layout the surface of the base layer; and obtain the amount of the lower layer filler from the adjusted BIM model, and use the transport vehicle to assist the paver to evenly spread the surface filler on the base layer. The paving surface is required to be flat and have the specified road humps. Then use the BIM layout robot to detect the loose paving thickness of the lower layer and the surface elevation of the lower layer filler at each control point, import the data into the BIM model, analyze whether the elevation of each control point meets the design requirements, and manually reduce or supplement the material when necessary. Rolling is carried out after the elevation of each control point meets the design requirements. Check the compaction degree, and complete the construction of the lower layer after the compaction degree meets the design requirements; After the construction of the lower layer is completed, the BIM layout robot is used to measure the actual elevation of each control point on the surface of the lower layer, and the data is imported into the BIM model. The BIM model is adjusted according to the actual elevation of each control point, and the amount of surface filler of the middle surface layer is obtained from the adjusted BIM model. The transport vehicle is used to assist the paver to evenly spread the surface filler on the surface of the lower layer. The paving surface is required to be flat and have the specified road arch. Then the BIM layout robot is used to detect the loose paving thickness of the middle surface layer and the surface elevation of the middle surface filler at each control point. The data is imported into the BIM model to analyze whether the elevation of each control point meets the design requirements. If necessary, the material is manually reduced or supplemented. After the elevation of each control point meets the design requirements, rolling is carried out. Check the compaction degree, and when the compaction degree meets the design requirements, the construction of the middle surface layer is completed; After the construction of the middle surface layer is completed, the BIM layout robot is used to measure the actual elevation of each control point on the surface of the middle surface layer, and the data is imported into the BIM model. The BIM model is adjusted according to the actual elevation of each control point, and the amount of surface filler of the upper layer is obtained from the adjusted BIM model. The transport vehicle is used to assist the paver to evenly spread the surface filler on the surface of the middle surface layer. The paving surface is required to be flat and have the specified road arch. Then the BIM layout robot is used to detect the loose paving thickness of the middle surface layer and the surface elevation of the middle surface filler at each control point. The data is imported into the BIM model to analyze whether the elevation of each control point meets the design requirements. If necessary, the material is manually reduced or supplemented. After the elevation of each control point meets the design requirements, rolling is carried out. Check the compaction degree, and complete the construction of the upper layer after the compaction degree meets the design requirements; Use a BIM layout robot to measure the actual elevation of each control point on the upper surface, and import the data into the BIM model to analyze whether the actual elevation of each control point meets the design requirements. Analyze the smoothness of the upper surface based on the elevation. If it does not meet the design requirements, manually increase or decrease the upper layer filler and compact it if necessary.

[0034] S8, road marking construction A BIM layout robot is used to layout traffic markings on the surface according to the BIM model. When staking out traffic markings, an intelligent BIM layout robot that can walk can be used. After the BIM model is input into the intelligent BIM layout robot, the layout robot can automatically walk along the set route to layout, and finally use traffic marking construction equipment to carry out traffic marking construction on the surface.

[0035] The construction of the road intersection is now completed.

[0036] It should be noted that the above embodiments are illustrative of the technical solution of the present invention rather than limiting. Equivalent substitutions made by ordinary technicians in the relevant technical field or other modifications made according to the prior art should be included in the scope of rights required by the present invention as long as they do not exceed the concept and scope of the technical solution of the present invention.

Claims

1. A road intersection construction method based on a BIM model, characterized by: The construction steps include: S1. Establish BIM model Construct a road intersection BIM model based on the vertical design drawing of the road intersection; S2. Modify the BIM model Correct the straightness of road intersections in the BIM model, the uneven transition of curves, the uneven transition of local elevations, and the conflict between the horizontal and vertical slopes of the road; S3. Roadbed construction S31, positioning and setting out Determine the on-site stakeout points and control points of the road intersection from the revised BIM model, and use intelligent surveying and stakeout equipment to stake out the road intersection to form the construction area of ​​the road intersection; S32, Excavation of roadbed trench Dig out the soil and rocks in the construction area and roll and compact them to form a soil base; S33, roadbed trench backfilling Spread backfill soil in the roadbed trench, repair the road crown, and compact it by rolling to form the roadbed; S4. Pad construction S41. Use intelligent measurement and layout equipment to measure the actual elevation of each control point on the roadbed surface, and import the data into the BIM model. Adjust the BIM model according to the actual elevation of each control point on the roadbed surface, and obtain the amount of cushion filler and the stacking position of each vehicle cushion filler from the adjusted BIM model; S42, transporting and stacking cushion fillers, and spreading, rolling and compacting the stacked cushion fillers to form a cushion layer; S5. Base construction S51, using intelligent measurement and layout equipment to measure the actual elevation of the cushion surface of each control point, and importing the measurement data into the BIM model, adjusting the BIM model according to the actual elevation of each control point on the cushion surface, obtaining the amount of base filler from the adjusted BIM model, and determining the layout point from the adjusted BIM model; S52, using intelligent surveying and staking equipment to stake out the roadbed surface; S53, spread the base filler on the roadbed surface and compact it by rolling; S54, check the compaction degree, and complete the base construction after the compaction degree meets the design requirements; S6, curb construction S61. Use intelligent measurement and layout equipment to measure the actual elevation of the base surface of each control point, import the measurement data into the BIM model, adjust the BIM model according to the measurement data, and obtain the amount of side stones and curb stones, side stones and curb stone control points and layout points from the adjusted BIM model; S62, using intelligent measurement and layout equipment to lay out on the surface of the base layer to form an installation area for side flat stones and curb stones; S63, dig a groove on the surface of the base, level the bottom of the groove, and manually install side stones and curbstones in the groove to form curbs; S7, surface construction S71, determine the surface layer lofting points from the BIM model adjusted in step S61, and use the intelligent measurement and lofting equipment to loft on the surface of the base layer; and obtain the surface layer filler dosage from the adjusted BIM model, S72, evenly spread the surface filler and compact it. S73. Check the compaction degree and complete the surface layer construction after the compaction degree meets the design requirements; S8, road marking construction Intelligent surveying and setting out equipment is used to set out traffic markings on the surface layer according to the BIM model, and finally traffic marking construction equipment is used to draw traffic markings on the surface layer; The construction of the road intersection is now completed.

2. The road intersection construction method based on the BIM model according to claim 1 is characterized in that: In the step S33, when the roadbed trench is backfilled, the elevation of each control point on the surface of the soil base is firstly re-measured using intelligent measurement and setting-out equipment, and the data is imported into the BIM model, and the amount of backfill soil used for the roadbed trench and the stacking position of each truck of backfill soil are obtained from the BIM model; Then, after the backfill soil is piled up at the corresponding position, the backfill soil is spread by a grader and the road crown is repaired; Then, the intelligent surveying and setting out equipment is used to measure the elevation of each control point on the surface of the loose backfill soil, and the elevation data is imported into the BIM model. The BIM model analyzes whether the elevation of each control point meets the design requirements and gives the data for reducing or replenishing materials. The materials are manually reduced or replenished based on the data. After the elevations of all control points on the backfill soil surface meet the design requirements, the soil is compacted mechanically. After the compaction degree meets the design requirements, the roadbed construction is completed.

3. The road intersection construction method based on the BIM model according to claim 1 is characterized in that: During the cushion construction in step S4, the cushion is constructed in a layered manner, and the elevation of the control point of each cushion layer, the amount of cushion filler for each cushion layer, and the stacking position of cushion filler for each vehicle in each cushion layer are obtained from the adjusted BIM model; The cushion filler is spread layer by layer from bottom to top. After each layer of cushion filler is spread, the elevation of each control point on the surface of the loosely laid cushion filler is measured by intelligent measuring and layout equipment, and the elevation data is imported into the BIM model. The BIM model analyzes whether the elevation of each control point meets the design requirements, and gives the data for reducing or supplementing material. Material is manually reduced or supplemented based on the data. After the elevation of each control point on the surface of this layer meets the design requirements, it is compacted mechanically before the next layer of cushion filler is spread.

4. The road intersection construction method based on the BIM model according to claim 1 is characterized in that: When spreading the base filler in step S53, a transport vehicle is used to assist the paver in evenly spreading the base filler on the roadbed. The paving surface is required to be flat and have a specified road arch. Then, the loose paving thickness of the base layer and the base layer surface elevation of each detection point are detected by intelligent measurement and layout equipment, and the data is imported into the BIM model to analyze whether the elevation of each control point meets the design requirements. If necessary, material is manually reduced or supplemented, and rolling is performed only after the elevation of each control point meets the design requirements.

5. The road intersection construction method based on the BIM model according to claim 4 is characterized in that: The base filler is a mixture of cement, lime, crushed stone, sand and water, and the particle size of the crushed stone is less than or equal to 10 mm.

6. The road intersection construction method based on the BIM model according to claim 1 is characterized in that: During the curb construction in step S6, for the curb construction of the straight section of the road intersection, control points can be set at both ends and / or in the middle of the straight section, and the elevation and installation position of the side stones and curb stones of the straight section can be controlled by pulling lines at the control points; for the curb stone and curb stone construction of the curved section of the road intersection, the elevation and installation position of each side stone and curb stone can be monitored by intelligent measurement and layout equipment.

7. The road intersection construction method based on the BIM model according to claim 1 is characterized in that: When the surface layer is constructed in step S7, the surface layer is one layer or multiple layers. When the surface layer is multiple layers, it is constructed layer by layer from bottom to top. After the filler of one layer is spread and rolled, the next layer is constructed.

8. The road intersection construction method based on the BIM model according to claim 7 is characterized in that: When spreading the surface filler, a transport vehicle is used to assist the paver to evenly spread the surface filler on the base layer. The paving surface is required to be flat and have a specified road arch. Then, an intelligent measuring and layout equipment is used to detect the loose paving thickness of the surface layer and the surface elevation of the surface filler at each control point. The data is imported into the BIM model to analyze whether the elevation of each control point meets the design requirements. If necessary, material is manually reduced or supplemented. Rolling is performed only after the elevation of each control point meets the design requirements.

9. The road intersection construction method based on the BIM model according to any one of claims 1 to 8, characterized in that: The intelligent measurement and layout equipment is a BIM layout robot.

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