A 3D in-situ printing broken test road pavement construction method based on BIM technology

Abstract

The application discloses a 3D in-situ printing broken test road pavement construction method based on BIM technology, a broken test area exists in a test road design, the broken test area presents irregular pits and depressions, the pits and depressions are in a gradient or uneven state in the depth direction; the test road is divided into a base layer, a lower surface layer and an upper surface layer from bottom to top; and the broken test area is arranged in the upper surface layer. The application is used for the construction of a broken road section in an in-situ mode, is beneficial to guarantee the convenient construction of the broken test road section and the high-precision compliance with the design requirements, and can greatly provide the construction quality and speed by applying the BIM technology and the 3D printing technology. By setting the key points of the pits and depressions, the boundary and the longitudinal section positions and the like can be finely copied during modeling, and the three-dimensional accurate printing in the later period is facilitated. By the zigzag jointing and the embedded parts, the horizontal and vertical jointing connection of the broken test area and the poured test road is facilitated, and the integrity of the connection is guaranteed.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of test road construction, and particularly relates to a 3D in-situ printing broken test road pavement construction method based on BIM technology. BACKGROUND

[0002] With the development of extreme activities, extreme tracks have also begun to enter people's field of vision. Due to the multifunctionality and complexity of the extreme tracks, they are different from other general roads. Some of the tracks are used to simulate extreme environments and complex road conditions, such as high-speed and extreme performance test areas, extreme environment test areas, urban traffic scene test areas, rural traffic scene test areas, automatic parking test areas, mountain road simulation test areas, multifunctional test areas (virtual test squares), high-speed ramp scene test areas, and extreme speed test areas.

[0003] However, for the rural traffic scene test road, it includes broken cement road, non-signaled intersection, gravel road, broken asphalt road, non-marked intersection, sherbet road, shaded road, and waterlogged road. When testing the broken section, there are two common construction methods: 1. partially removing after completing the entire paving, which has the problem of depth and size not meeting the requirements; and 2. using a formwork to support and pave before paving, but the formwork is prone to deformation due to the high temperature of the asphalt paving, and the contact surface between the upper and lower layers may slip. Therefore, it is necessary to design a broken test road pavement construction method that can be constructed in-situ, is easy to implement, and has high precision and meets the design requirements. SUMMARY

[0004] The application provides a 3D in-situ printing broken test road pavement construction method based on BIM technology, which solves the problems of in-situ production, construction, and overall connection of the broken area in the test road.

[0005] To achieve the above-mentioned purpose, the application adopts the following technical solutions:

[0006] A 3D in-situ printing broken test road pavement construction method based on BIM technology, wherein the test road design has a broken test area, the broken test area has irregular potholes, and the potholes are gradually changed or uneven in the depth direction; the test road is divided into a base layer, a lower layer, and an upper layer from bottom to top; and the broken test area is arranged in the upper layer.

[0007] Step one, determining the on-site broken test area and marking the potholes, lofting the broken test area and the potholes,

[0008] For the potholes that need to be modeled, a local coordinate system is established, and the corresponding relationship between the local coordinate system and the overall coordinate system is established, which facilitates the subsequent conversion of the local coordinate system into the overall coordinate system.

[0009] Step two, determine the key node coordinates of the pit boundary change in the plan, determine the key node coordinates of each linear according to the drawing, and correspond to the section, determine the three-dimensional coordinate system of the key node, and determine the coordinates of the internal node in the same way:

[0010] Step three, supplement the key node coordinates of the longitudinal section, supplement the corresponding node coordinates at the change of the pit longitudinal section arc curve;

[0011] Step four, according to the lofting data and deepening drawing, convert all local coordinates into global coordinates, and establish BIM three-dimensional model according to the sorted coordinate data;

[0012] Step five, pave the lower layer on the base according to the original design construction method, remove the lower layer of the damage test area that needs to be installed in situ according to the designated damage test area, and install the embedded part on the surface; The connection between the area that has been poured and the damage test area is also modified, so that the side surface of the upper layer forms a zigzag shape;

[0013] Step six, establish a software interface, import the BIM three-dimensional model into the 3D printer system, and perform 3D printing of the upper layer of the damage test area on site. After the raw materials are mixed by the mixing system, the printing work is completed. The raw materials are mixed by warm mixing or cold mixing. For the same standard damage test area, a pump station is established for printing output, and each pump station is controlled by the same terminal to realize multi-point simultaneous in-situ printing construction;

[0014] Step seven, directly print the upper layer on the damage test area, and heat treat the transverse joint of the upper layer and fill the asphalt paste to form a whole with the original poured pavement.

[0015] Further, the pits are unevenly arranged on the upper layer, and the size and number of the pits are adapted to the position of the test road.

[0016] Further, the damage test area is arranged at the turning place, and the radius of the turning place is a small radius; The damage test area is arranged in a fan shape from the inside to the outside.

[0017] Further, for step two, the key node coordinates of the pit outer boundary are determined at the turning points and the inflection points. The number of selected points of the arc line is determined according to the deepening precision.

[0018] Further, for step three, the key node coordinates of the longitudinal section are supplemented by taking the midpoint and endpoint of the arc shape at the longitudinal section, and then obtaining the corresponding node in the plan, and converting the local coordinates obtained in CAD into global coordinates.

[0019] Further, the overlapping length of the damaged test area and the horizontal joint of the two sides of the poured area is not less than 1m, and the width of each zigzag joint is not less than 0.5m.

[0020] Further, the zigzag joint length direction is sequentially arranged along the road length direction, and the width direction is perpendicular to the road length direction; in the arc-shaped turning road, the zigzag joint length direction is arranged along the direction of the arc radian, and the width direction is perpendicular to the direction of the arc radian.

[0021] Further, the depth of the embedded part in the lower layer is not less than 20mm, and the lower layer and the upper layer are connected in situ and the adhesive is applied in advance.

[0022] Further, the verification point is arranged at the in-situ damaged test area after printing, and the accuracy of the in-situ positioning is positioned and checked according to the coordinates of the verification point after field installation.

[0023] Further, the BIM three-dimensional model also has a verification module, and the spatial coordinates of the field construction verification point and the design point are compared, and if the comparison difference exceeds the design allowable error, an early warning is displayed.

[0024] The beneficial effects of the present application are reflected in:

[0025] 1) The present application constructs the damaged road section by in-situ construction method, which is beneficial to ensure the timely construction and temporary adjustment of the damaged test road section; wherein the BIM technology and 3D printing technology are applied, which can greatly improve the construction quality and speed; the raw materials are warm-mixed or cold-mixed, which is beneficial to the response of double-carbon energy consumption reduction;

[0026] 2) The present application sets key points of potholes, which is beneficial to fine copying of the boundary and longitudinal section positions during modeling, and is beneficial to three-dimensional accurate printing in the later period.

[0027] 3) The present application uses zigzag joints and embedded parts to connect the horizontal and vertical joints of the damaged test area and the poured test road, thereby ensuring the integrity of the connection.

[0028] Other features and advantages of the present application will be set forth in the following description, and will in part be apparent from the description, or will be learned by practice of the present application; the main purpose and other advantages of the present application can be achieved and obtained by the scheme specially pointed out in the description. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a schematic view of the damaged test area in the curved test road;

[0030] Figure 2 is a partial schematic view of the damaged test area in the curved test road;

[0031] Figure 3 is a schematic diagram of a sawtooth joint road surface level;

[0032] Figure 4 is a schematic diagram of a pre-embedded part joint road surface section;

[0033] Figure 5 is a schematic diagram of key node coordinates in a pothole boundary;

[0034] Figure 6 is a schematic diagram of key node coordinates in a pothole longitudinal section.

[0035] Reference signs: 1 - test road, 2 - damaged test area, 3 - pothole, 4 - sawtooth joint, 5 - base layer, 6 - lower layer, 7 - upper layer, 8 - pre-embedded part. DETAILED DESCRIPTION

[0036] Taking a certain intelligent networked vehicle test field project as an example, the main construction contents include high-speed and limit performance test area, extreme environment test area, urban traffic scene test area, rural traffic scene test area, automatic parking test area, mountain road simulation test area, multi-functional test area (virtual test square), high-speed ramp scene test area, limit speed test area, etc.

[0037] The test road meets the requirements of the national closed test field standard specification, and combined with the actual needs of future operation, a domestic first-class closed test site for passenger cars and commercial vehicles (including 20-ton trucks) is built. The test system meets the requirements of the national closed test field standard specification, and fully utilizes advanced technologies such as big data, artificial intelligence, 5G, edge computing, and parallel driving. The rural traffic scene test road includes damaged cement road, no sign intersection, gravel road, damaged asphalt road, no marking intersection, soda road, shaded road, waterlogged road, and 7-meter-wide road shoulder outside the road.

[0038] Taking a damaged test area with a bend as an example, the test road 1 is designed to have a damaged test area 2, which presents irregular potholes 3 that are gradually changing or uneven in the depth direction. The test road 1 is divided into a base layer 5, a lower layer 6, and an upper layer 7 from bottom to top; and the damaged test area 2 is provided in the upper layer 7.

[0039] In combination with as shown in Figures 1 to 6 , the damaged test area 2 is provided at the turning position, and the turning position has a small radius; the damaged test area 2 is provided in a fan shape from the inside to the outside. The potholes 3 are non-uniformly provided in the upper layer 7, and the size and number of the potholes 3 are adapted to the position of the test road 1.

[0040] Further description of the 3D in-situ printing damaged test road pavement construction method based on BIM technology, the specific steps are as follows:

[0041] Step one, determine the field damage test area 2, and demarcate the pothole 3; loft the damage test area 2 and the pothole 3,

[0042] For the pothole 3 that needs to be modeled, a local coordinate system is established, and the corresponding relationship between the local coordinate system and the overall coordinate system is established, which facilitates the subsequent conversion of the local coordinate system into the overall coordinate system.

[0043] Step two, determine the key node coordinates of the boundary change of the pothole 3 in the plan view, determine the key node coordinates of each linear segment according to the drawing, and correspond to the section view, determine the three-dimensional coordinate system of the key node, and determine the coordinates of the internal nodes in the same way.

[0044] For step two, the key node coordinates are determined at the turning points and the arc change of the outer boundary of the pothole 3; wherein the number of selected points of the arc segment is determined according to the deepening accuracy. As shown in Figure 5 The key nodes are represented by points P1 to P15.

[0045] Step three, supplement the key node coordinates of the longitudinal section, and supplement the corresponding node coordinates at the change of the longitudinal section arc curve of the pothole 3.

[0046] For step three, as shown in Figure 6 The key node coordinates of the longitudinal section are supplemented, the midpoint and endpoint of the arc at the longitudinal section are taken respectively, the midpoint and endpoint are represented by points bc1 and bc2, and then the corresponding node is obtained in the plan view, and the local coordinates are obtained in CAD and converted into overall coordinates.

[0047] Step four, convert all local coordinates into overall coordinates according to the lofting data and deepening drawings, and establish a BIM three-dimensional model according to the sorted coordinate data.

[0048] Step five, pave the underlying layer 6 on the base layer 5 according to the original design construction method, remove the underlying layer 6 of the damage test area 2 that needs to be installed in situ according to the demarcated damage test area 2, install the embedded part 8 on the surface; the connection between the poured area and the damage test area 2 is also corrected, so that the side surface of the upper layer 7 forms a zigzag shape.

[0049] Step six, establish a software interface, import the BIM three-dimensional model into the 3D printer system, and perform 3D printing of the upper layer 7 of the damage test area 2 on site. After the raw materials are mixed by the mixing system, the printing work is completed. The raw materials are mixed by warm mixing or cold mixing.

[0050] The depth of the embedded part 8 in the underlying layer 6 is not less than 20 mm, and the underlying layer 6 and the upper layer 7 are connected in situ, and the adhesive is applied in advance.

[0051] For the same standard damage test area, the pump stations are respectively established to print out, and each pump station is controlled by the same terminal control end to realize multi-point simultaneous in-situ printing construction.

[0052] In the embodiment, the damage test area 2 is connected with the horizontal joints of the two sides of the cast area, the overlap joint length is not less than 1 m, and the width of each zigzag joint 4 is not less than 0.5 m. The zigzag joint 4 is arranged along the road length direction in sequence, and is arranged perpendicularly to the road length direction in the width direction; at the arc-shaped turning road, the zigzag joint 4 is arranged along the direction of the arc radian in the length direction, and is arranged perpendicularly to the direction of the arc radian in the width direction.

[0053] Step seven, printing the upper layer 7 directly on the damage test area, and performing heat treatment on the transverse joint of the upper layer 7 and filling the asphalt paste to form a whole with the original cast pavement.

[0054] In addition, the verification points are arranged at the in-situ damage test area 2 after printing, and the in-situ accuracy is positioned and checked according to the coordinates of the verification points after installation. The verification module is also arranged in the BIM three-dimensional model, the spatial coordinates of the field construction verification points and the design points are compared, and if the comparison difference exceeds the design allowable error, the warning is displayed.

[0055] The above merely describes the preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any changes or replacements within the technical range disclosed by the present application should be covered within the protection scope of the present application.

Claims

1. A 3D in-situ printing of damaged test road pavement construction method based on BIM technology, characterized by, The test road (1) is designed to have a damaged test area (2), the damaged test area (2) has irregular potholes (3), and the potholes (3) are gradually changed or uneven in the depth direction; the damaged test area (2) is arranged at a turning position, and the radius of the turning position is a small radius; the damaged test area (2) is arranged in a fan shape from the inside to the outside; Step one, determine the on-site damaged test area (2) and mark the potholes (3); loft the damaged test area (2) and the potholes (3), For the potholes (3) that need to be modeled, a local coordinate system is established, and the corresponding relationship between the local coordinate system and the overall coordinate system is established, which facilitates the subsequent conversion of the local coordinate system into the overall coordinate system; The potholes (3) are unevenly arranged on the upper layer (7), and the size and number of the potholes (3) are determined according to the position of the test road (1); Step two, determine the key node coordinates of the boundary changes of the potholes (3) in the plan view, determine the key node coordinates of each linear segment according to the drawing, and correspond to the section view, determine the three-dimensional coordinate system of the key nodes, and determine the coordinates of the internal nodes by the same method: For step two, when determining the key node coordinates of the outer boundary of the potholes (3), set them at the turning positions and the radian change positions; the number of selected points of the arc segment is determined according to the deepening accuracy at the radian change position; Step three, supplement the key node coordinates of the vertical section, and supplement the corresponding node coordinates at the change position of the vertical section arc curve of the potholes (3); For step three, when supplementing the key node coordinates of the vertical section, take the midpoint and endpoint of the arc shape at the vertical section, respectively, and then obtain the corresponding nodes in the plan view, and convert the local coordinates obtained in CAD into overall coordinates; Step four, according to the lofting data and deepening drawing, convert all local coordinates into overall coordinates, and establish a BIM three-dimensional model according to the sorted coordinate data; Step five, according to the original design construction method, pave the lower layer (6) on the base layer (5), and according to the marked damaged test area (2), remove the lower layer (6) of the damaged test area (2) that needs to be installed in situ, and install the embedded part (8) on the surface; the connection between the poured area and the damaged test area (2) is also modified, so that the side surface of the upper layer (7) forms a zigzag joint (4); The depth of the embedded part (8) in the lower layer (6) is not less than 20mm, and the lower layer (6) and the upper layer (7) are connected in situ, and the adhesive is applied in advance; Step six, establish a software interface, import the BIM three-dimensional model into the 3D printer system, and perform 3D printing of the upper layer (7) of the damaged test area (2) on site, and complete the printing work after the raw materials are mixed by the mixing system; the raw materials are mixed by warm mixing or cold mixing; in the same standard damaged test area (2), a pump station is established for printing output, and each pump station is controlled by the same terminal control to realize multi-point simultaneous in-situ printing construction; Step seven, directly print the upper layer (7) on the damaged test area, and perform heat treatment on the transverse joint of the upper layer (7) and fill the asphalt paste to form a whole with the original poured pavement.

2. A 3D in-situ printing of damaged test road pavement construction method based on BIM technology according to claim 1, characterized in that, The overlap length of the damaged test area (2) and the horizontal joint of the two sides of the cast area is not less than 1m, and the width of each zigzag joint (4) is not less than 0.5m.

3. A 3D as-laid printing broken test road pavement construction method based on BIM technology according to claim 1, characterized in that, The zigzag joint (4) is arranged along the length direction of the road in the long direction and arranged in the width direction perpendicular to the long direction of the road; in the arc-shaped turning road, the zigzag joint (4) is arranged along the direction of the arc radian in the length direction and arranged in the width direction perpendicular to the direction of the arc radian.

4. A 3D as-built printing distress testing pavement construction method based on BIM technology according to claim 1, characterized in that, The verification point is arranged at the in-situ damaged test area (2) of the printed road surface, and the accuracy of the in-situ position is positioned and checked according to the coordinates of the verification point after field installation.

5. A 3D as-built printing distress testing pavement construction method based on BIM technology according to claim 1, characterized in that, The BIM three-dimensional model is also provided with a verification module, and the spatial coordinates of the field construction verification point and the design point are compared. If the comparison difference exceeds the design allowable error, an early warning is displayed.

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