Construction method of 3D printing assembly type damaged test road surface based on BIM technology

Abstract

The application discloses a 3D printing assembly type broken test road pavement construction method based on BIM technology, a broken test area exists in 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 the broken road section in an assembly type, is beneficial to guarantee the convenient construction of the broken test road section and the high-precision compliance with the design requirements, and is used for the application of the BIM technology and the 3D printing technology, so that the construction quality and speed can be greatly provided; through the setting of the key points of the pits and depressions, the boundary and the longitudinal section positions are finely copied in modeling, and the three-dimensional accurate printing in the later period is facilitated; through the zigzag jointing and the tooth rubbing jointing, the horizontal and vertical jointing of the broken test area and the poured test road is facilitated, and the integrity of the jointing is guaranteed.

Description

TECHNICAL FIELD

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

[0002] With the development of extreme activities, extreme tracks have also entered the field of vision of people. Due to the multifunctionality and complexity of the extreme tracks, they are different from other general roads. Some of the tracks are used for simulating 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] The rural traffic scene test road includes damaged cement roads, non-signaled intersections, gravel roads, damaged asphalt roads, non-marked intersections, sherbet roads, shaded roads, and waterlogged roads. When testing the damaged road sections, 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 develop a damaged test road pavement construction method that is easy to implement and has high precision and meets the design requirements. SUMMARY

[0004] The application provides a 3D printing assembly type damaged test road pavement construction method based on BIM technology, which solves the technical problems of assembly type manufacturing, construction, and overall connection of damaged areas in test roads.

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

[0006] The 3D printing assembly type damaged test road pavement construction method based on BIM technology has a damaged test area in the design of the test road, and the damaged test area has irregular potholes that are gradually changing 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. The damaged test area is provided in the upper layer.

[0007] Step one, determine the damaged test area on site and mark the potholes, and perform lofting on the damaged 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, and remove the lower layer of the damage test area to be assembled and installed according to the designated damage test area, so that the surface forms a toothed joint; The connection between the area poured and the damage test area is also corrected, so that the side surface of the upper layer forms a zigzag shape;

[0013] Step six, establish software interface, import BIM three-dimensional model into 3D printer system, and perform 3D printing of the upper layer of the damage test area in the factory. After the raw materials are mixed qualified, the printing work is completed;

[0014] Step seven, transport the printed upper layer to the construction site, align the upper layer boundary with the lower layer boundary, complete the assembly work of the damage test area, and perform heat treatment on the transverse joint of the upper layer and pour asphalt paste to form a whole with the original poured pavement.

[0015] Further, the pits are unevenly arranged in 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 small radius; The damage test area is arranged in a fan shape from inside to outside.

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

[0018] Further, for step three, the key node coordinates of the longitudinal section are supplemented, respectively 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 overlap length of the damage 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 sawtooth-shaped stubble length direction is arranged along the road length direction, and the width direction is perpendicular to the road length direction; at the arc-shaped turning road, the sawtooth-shaped stubble 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 toothed stubble arranged in the lower layer is 2-4 mm, and the adhesive is applied in advance when the lower layer and the upper layer are assembled.

[0022] Further, the verification point is arranged at the printed assembled damage test area pavement, and the precision of the assembly is positioned and verified according to the coordinates of the verification point after field installation.

[0023] The beneficial effects of the present application are embodied in:

[0024] 1) The present application constructs the damaged road section in an assembled manner, which is beneficial to guarantee the convenient construction and high-precision design requirements 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;

[0025] 2) The present application sets the key points of the potholes, which is beneficial to finely reproduce the boundary and longitudinal section positions during modeling, and is beneficial to the later three-dimensional accurate printing;

[0026] 3) The present application uses the sawtooth-shaped stubble and the toothed stubble, which is beneficial to the horizontal and vertical stubble connection of the damaged test area and the poured test road, and guarantees the integrity of the connection.

[0027] Other features and advantages of the present application will be set forth in the following description, and become apparent from the description, or be learned by practice of the present application; the main purpose and other advantages of the present application can be realized and obtained by the specific schemes indicated in the description. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a schematic diagram of a damaged test area in a curved test road;

[0029] Figure 2 is a local schematic diagram of a damaged test area in a curved test road;

[0030] Figure 3 is a schematic diagram of a road surface level at a sawtooth-shaped stubble connection;

[0031] Figure 4 is a schematic diagram of a road surface section at a toothed stubble connection;

[0032] Figure 5 is a schematic diagram of key node coordinates in a pothole boundary;

[0033] Figure 6 is a schematic view of key node coordinates in a longitudinal section of a pothole.

[0034] Reference signs: 1 - test road, 2 - damaged test area, 3 - pothole, 4 - zigzag joint, 5 - base layer, 6 - lower layer, 7 - upper layer, 8 - toothed joint. DETAILED DESCRIPTION

[0035] Taking a certain intelligent networked vehicle test field project as an example, the main construction contents include high-speed and extreme 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, extreme speed test area, etc.

[0036] 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 capable of testing 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 makes full use of advanced technologies such as big data, artificial intelligence, 5G, edge computing, and parallel driving. Among them, 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, road width 7 meters, and 0.5 meters wide shoulder outside the road.

[0037] Taking the damaged test area provided with a bend as an example, 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 test road 1 is divided into a base layer 5, a lower layer 6 and an upper layer 7 from bottom to top; wherein the damaged test area 2 is provided in the upper layer 7.

[0038] Combined with as shown in Figures 1 to 6 , the damaged test area 2 is provided at the turning position, and the radius of the turning position is a small radius; the damaged test area 2 is provided in a fan shape from inside to 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.

[0039] Further illustrate the 3D printing assembly type damaged test road pavement construction method based on BIM technology, the specific steps are as follows:

[0040] 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,

[0041] 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 is convenient for subsequent conversion of the local coordinate system into the overall coordinate system.

[0042] Step 2: Determine the coordinates of the key nodes for the boundary changes of pit 3 in the plan view. Determine the coordinates of the key nodes for each linear segment according to the drawings, and then map them to the cross-sectional view to determine the three-dimensional coordinate system of the key nodes. Use the same method to determine the coordinates of the internal nodes.

[0043] When determining the key node coordinates for step two, specifically the outer boundary of pit 3, coordinates are set at both turning points and points of curvature change; the number of points selected for the arc segment at curvature change points is determined based on the detailing accuracy. For example... Figure 5 As shown, key nodes are represented by points P1 to P15.

[0044] Step 3: Supplement the coordinates of key nodes in the longitudinal section. Supplement the corresponding node coordinates at the changes in the arc curve of the longitudinal section of pit 3.

[0045] For step three, such as Figure 6 As shown, the coordinates of key nodes in 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. Then, the corresponding nodes are obtained in the plan view. After obtaining the local coordinates in CAD, they are converted into global coordinates.

[0046] Step 4: Based on the above layout data and detailed drawings, convert all the obtained local coordinates into global coordinates, and build a BIM 3D model based on the organized coordinate data.

[0047] Step 5: Lay the lower layer 6 on the base layer 5 according to the original design construction method. According to the designated damage test area 2, remove the lower layer 6 of the damage test area 2 that needs to be assembled and installed, so that the surface forms a toothed joint 8. Also correct the connection between the poured area and the damage test area 2, so that the side of the upper layer 7 forms a sawtooth shape.

[0048] Step 6: Establish a software interface, import the BIM 3D model into the 3D printer system, and perform 3D printing on the upper layer 7 of the damage test area 2 in the factory. After the raw materials are mixed to meet the requirements by the mixing system, the printing work is completed.

[0049] Specifically, the depth of the toothed joint 8 in the lower layer 6 is 2-4mm, and adhesive is pre-applied when the lower layer 6 and the upper layer 7 are assembled together.

[0050] In this embodiment, at the horizontal joint between the damaged test area 2 and the already poured areas on both sides, the overlap length is not less than 1m, and the width of each sawtooth joint 4 is not less than 0.5m. The sawtooth joint 4 is set along the length of the road and perpendicular to the length of the road in the width direction; at the curved road bend, the sawtooth joint 4 is set along the direction of the arc in the length direction and perpendicular to the direction of the arc in the width direction.

[0051] Step seven, the printed upper layer 7 is transported to the construction site, after aligning the boundary of the upper layer 7 with the boundary of the lower layer 6, the assembly work of the damage test area 2 is completed, the transverse joint of the upper layer 7 is heat treated, and the asphalt paste is poured to form a whole with the original pavement.

[0052] In addition, a check point is arranged at the printed assembly type damage test area 2 pavement, and after field installation, the accuracy of assembly is positioned and checked according to the coordinates of the check point.

[0053] The above merely describes the preferred embodiments of the present application, but the protection scope of the present application is not limited to this, any changes or replacements thought by those skilled in the art within the technical range disclosed by the present application should be covered within the protection scope of the present application.

Claims

1. A 3D-printed prefabricated road surface construction method based on BIM technology for damage testing, characterized in that, The test road (1) is designed with a damaged test area (2), which has irregular potholes (3). The potholes (3) are gradually changing or uneven in the depth direction. Potholes (3) are not uniformly distributed on the upper layer (7), and the size and number of potholes (3) are determined according to the location of the test road (1); Step 1: Determine the on-site damage test area (2) and mark the pits (3); Lay out the damage test area (2) and the pits (3). For the pits and depressions that need to be modeled (3), establish a local coordinate system and establish the corresponding relationship between the local coordinate system and the global coordinate system to facilitate the subsequent transformation of the local coordinate system into the global coordinate system; Step 2: Determine the coordinates of the key nodes for the boundary changes of the pit (3) in the plan view. Determine the coordinates of the key nodes for each line segment according to the drawings, and correspond them to the cross-sectional view to determine the three-dimensional coordinate system of the key nodes. Use the same method to determine the coordinates of the internal nodes. Step 3: Supplement the coordinates of key nodes in the longitudinal section. Supplement the corresponding node coordinates at the changes in the arc curve of the longitudinal section of the pit (3). Step 4: Based on the above layout data and detailed drawings, convert all the obtained local coordinates into global coordinates, and build a BIM 3D model based on the organized coordinate data. Step 5: Lay the lower layer (6) on the base layer (5) according to the original design construction method. According to the designated damage test area (2), remove the lower layer (6) of the damage test area (2) that needs to be assembled and installed, so that the surface forms a toothed joint (8). Also correct the connection between the poured area and the damage test area (2), so that the side of the upper layer (7) forms a sawtooth joint (4). The depth of the toothed joint (8) in the lower layer (6) is 2-4mm, and the adhesive is applied in advance when the lower layer (6) and the upper layer (7) are assembled together; Step 6: Establish a software interface, import the BIM 3D model into the 3D printer system, and perform 3D printing of the upper layer (7) of the damage test area (2) in the factory. After the raw materials are mixed to meet the requirements by the mixing system, the printing work is completed. Step 7: Transport the printed top layer (7) to the construction site, align the boundary of the top layer (7) with the boundary of the bottom layer (6), complete the assembly of the damaged test area (2), and heat-treat the transverse joint of the top layer (7) and fill it with asphalt grout to form an integral whole with the original poured pavement.

2. The method for constructing a 3D-printed prefabricated road surface for damage testing based on BIM technology as described in claim 1, characterized in that, The damage test area (2) is set at the turning point, and the radius of the turning point is a small radius; the damage test area (2) is set in a fan shape from the inside to the outside.

3. The method for constructing a 3D-printed prefabricated road surface for damage testing based on BIM technology as described in claim 1, characterized in that, In step two, when determining the coordinates of key nodes on the outer boundary of the pit (3), key nodes are set at both the turning point and the arc change point; the number of points to be selected for the arc segment at the arc change point is determined according to the deepening accuracy.

4. The method for constructing a 3D-printed prefabricated road surface for damage testing based on BIM technology as described in claim 3, characterized in that, In step three, the coordinates of key nodes in the longitudinal section are supplemented by taking the midpoint and endpoint of the arc line at the longitudinal section, and then obtaining the corresponding nodes in the plan view. After obtaining the local coordinates in CAD, they are converted into global coordinates.

5. The method for constructing a 3D-printed prefabricated road surface for damage testing based on BIM technology as described in claim 1, characterized in that, The horizontal overlap length between the damaged test area (2) and the areas already poured on both sides shall not be less than 1m, and the width of each sawtooth joint (4) shall not be less than 0.5m.

6. The method for constructing a 3D-printed prefabricated road surface for damage testing based on BIM technology as described in claim 5, characterized in that, The serrated joint (4) is set along the length of the road and perpendicular to the length of the road in the width direction; at the curved road bend, the serrated joint (4) is set along the arc of the curve in the length direction and perpendicular to the arc of the curve in the width direction.

7. The method for constructing a 3D-printed prefabricated road surface for damage testing based on BIM technology as described in claim 1, characterized in that, After printing, a verification point is set on the road surface of the assembled damage test area (2). After on-site installation, the accuracy of the assembly is checked according to the coordinates of the verification point.

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