CN114032731A - Imitation reduction method for special road of automobile test yard - Google Patents
Imitation reduction method for special road of automobile test yard Download PDFInfo
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- CN114032731A CN114032731A CN202111293279.3A CN202111293279A CN114032731A CN 114032731 A CN114032731 A CN 114032731A CN 202111293279 A CN202111293279 A CN 202111293279A CN 114032731 A CN114032731 A CN 114032731A
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000012360 testing method Methods 0.000 title claims abstract description 18
- 230000009467 reduction Effects 0.000 title claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 59
- 239000010959 steel Substances 0.000 claims abstract description 59
- 230000001788 irregular Effects 0.000 claims abstract description 14
- 230000011218 segmentation Effects 0.000 claims abstract description 9
- 238000004088 simulation Methods 0.000 claims abstract description 6
- 238000010146 3D printing Methods 0.000 claims abstract description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 16
- 239000010410 layer Substances 0.000 claims description 15
- 238000003698 laser cutting Methods 0.000 claims description 11
- 239000011159 matrix material Substances 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 8
- 239000004575 stone Substances 0.000 claims description 8
- 238000000465 moulding Methods 0.000 claims description 7
- 238000004140 cleaning Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 6
- 238000005516 engineering process Methods 0.000 claims description 4
- 230000000740 bleeding effect Effects 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 239000000428 dust Substances 0.000 claims description 3
- 239000004746 geotextile Substances 0.000 claims description 3
- 230000003116 impacting effect Effects 0.000 claims description 3
- 238000009417 prefabrication Methods 0.000 claims description 3
- 239000003755 preservative agent Substances 0.000 claims description 3
- 230000002335 preservative effect Effects 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 230000002787 reinforcement Effects 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- 238000007790 scraping Methods 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 239000002344 surface layer Substances 0.000 claims description 3
- 230000007306 turnover Effects 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 9
- 238000013519 translation Methods 0.000 abstract description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C9/00—Special pavings; Pavings for special parts of roads or airfields
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C5/00—Pavings made of prefabricated single units
- E01C5/06—Pavings made of prefabricated single units made of units with cement or like binders
- E01C5/08—Reinforced units with steel frames
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C9/00—Special pavings; Pavings for special parts of roads or airfields
- E01C9/001—Paving elements formed in situ; Permanent shutterings therefor ; Inlays or reinforcements which divide the cast material in a great number of individual units
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Road Repair (AREA)
Abstract
The invention discloses a simulation reduction method of a special road of an automobile test field, which comprises the steps of firstly establishing a 3D road digital model of a source road surface, then carrying out block segmentation on the 3D road digital model, generating contour surfaces of blocks on a regular road section, generating contour lines on two sides of the blocks on an irregular road section, pouring prefabricated block male molds on the regular road section by adopting a 3D printing template, then assembling the prefabricated block male molds into male molds, then sequentially carrying out male mold copying female molds, pouring prefabricated road panels by the female molds, then hoisting and paving the road panels in the road, and realizing the simulation of the irregular road section by adopting a laser-cut special-shaped steel mold to simulate the contour lines in a cast-in-place mode. The method perfectly performs the imitation translation restoration of the source pavement, saves the construction cost and accelerates the construction period.
Description
Technical Field
The invention relates to the technical field of construction of automobile test yards, in particular to a method for copying and restoring special roads of an automobile test yard.
Background
The automobile test field is an examination field for the research and development of novel automobiles, the road spectrum of the special road is unique to the automobile test field, and each special road is unique to each performance or certain performances of the automobiles. Most special road maps of the domestic test yards are all provided with roads 1 by the test yards of foreign mature vehicle enterprises: 1, simulating and restoring, and ensuring that the precision of the special road is controlled to be +/-2 mm. The existing special road imitation technology can not completely imitate and reduce the stone pavement, can only change the imitation mode that the material is changed from stone assembly into concrete pouring, and can not realize real imitation and reduction.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for copying and restoring a special road in an automobile test yard, perfectly perform copying and translation restoration of a source road surface, save the construction cost and accelerate the construction period.
The technical scheme of the invention is as follows:
a simulation reduction method for special roads in an automobile test yard comprises the following steps:
(1) and establishing a 3D road digital model: firstly, scanning by adopting a photographing type three-dimensional scanner to obtain three-dimensional laser dot matrix cloud information of a source pavement, and then establishing a 3D road digital model according to the three-dimensional laser dot matrix cloud information;
(2) and block division: performing block segmentation on the generated 3D road digital model, generating contour surfaces of the blocks by regular road sections, and generating contour lines on two sides of the blocks by irregular road sections;
(3) and manufacturing a road panel of the regular road section: for blocks of regular road sections, processing the blocks into templates by adopting a 3D printing technology according to profile data of the blocks, pouring according to the templates to form block prefabricated block male molds, splicing the block prefabricated block male molds into male molds, copying female molds according to the male molds, using the copied female molds as bottom molds, copying to prefabricate road outgoing panels, and hoisting and paving the road outgoing panels in a road;
(4) and manufacturing an irregular road section panel: for the blocks of irregular road sections, the contour lines on the two sides of the blocks are simulated by the special-shaped steel templates through laser cutting, and then the special-shaped steel templates are transported to the road to carry out cast-in-place molding of the road deck, namely, vertical molding, reinforcement cage binding, concrete pouring and curing molding are carried out in sequence.
In the step (1), the specific scanning operation of the photographing type three-dimensional scanner is as follows: the method comprises the steps of projecting specific grating stripes onto the surface of a source road surface by adopting visible light emitted by a 3D laser scanner, photographing the grating stripes by means of two CCD digital cameras with high resolution and included angles formed between the two CCD digital cameras, and finally processing photographed images to extract phase information of complete point clouds, so that three-dimensional laser dot matrix cloud information of the source road surface is obtained.
In the step (3), the male die copying female die comprises the following specific steps:
(a) cleaning a male die: before the mold turnover prefabrication, a soft hairbrush and a blower are used for cleaning dust and sundries on the surface of the male mold, so that the surface characteristic block of the male mold is prevented from being damaged;
(b) in the process of copying the female die by the male die, the male die is positioned at the lower part, the copied female die is positioned at the upper part, the surface of the male die at the lower part is cleaned, then a first-time release agent is smeared, a second-time release agent is smeared before binding the steel bar mesh, the smearing process of the second time needs to be careful and uniform, the first-time deposited release agent needs to be completely swept away, a small number of parts which are not smeared with the release agent are smeared uniformly, and after the second-time release agent is smeared, the steel bar mesh is bound on the male die;
(c) after the template of the female die is erected, the template is firmly connected and fixed by using a steel pipe scaffold, so that slurry leakage in the pouring process is prevented;
(d) after the template is reinforced, slowly pouring concrete to prevent the concrete from impacting the surface of the template and the reinforcing meshes, during pouring, pouring layer by layer, and after the first layer of concrete is poured and laid manually, pouring the concrete to the top of the template;
(e) after pouring is finished, the vibrating rod is obliquely inserted into the concrete for vibrating, after vibrating, a scraping ruler is used for drawing a plane, the flatness of the surface is guaranteed, and finally, geotextile is covered in time, water is sprayed for maintaining, and cracks of the concrete due to temperature difference are prevented;
(f) and after the curing period is finished, a jack is fixed between the embedded parts which are vertically corresponding to the two sides of the male die and the female die, so that the male die and the copied female die are subjected to jacking separation.
In the step (4), the specific steps of laser cutting the special-shaped steel template are as follows: firstly, segmenting a layer height line formed by a longitudinal section of a steel plate to be cut by adopting a horizontal segmentation line, numbering after segmentation, and identifying numbering data by laser equipment and carrying out laser cutting on a deformed steel template with a corresponding shape; after laser cutting is finished, a transverse rib plate and a plurality of vertical rib plates are fixedly welded on the inner side surface of the deformed steel template, the transverse rib plate is adjacent to the upper edge of the deformed steel template, and the top ends and the bottom ends of the plurality of vertical rib plates are respectively flush with the top end and the bottom end of the deformed steel template.
The thickness of the steel plate to be cut is 5mm, the steel plate with 2.5m layer height is segmented and numbered during cutting, the transverse rib plates and the vertical rib plates are steel plates with the width of 5cm and the thickness of 5mm, the distance between the adjacent vertical rib plates on the deformed steel template is 60cm, and when the template is erected, the channel steel with the height of 20cm is arranged at the bottom end of the deformed steel template and the vertical rib plates on the deformed steel template are welded and fixed, so that the deformed steel template is ensured to be integrally reliable and not to be loosened.
In the step (4), after the concrete pouring is finished, secondary plastering is carried out: the first time is rough and flat and is used for expelling bleeding and pressing stones down to ensure that the surface has a better surface, the second time is fine and flat, when the concrete is in an initial setting state and the surface is still wet, the concrete is longitudinally and transversely checked by a long straight ruler, and the concrete is smeared for four times while being checked; after the concrete surface layer is leveled, smoothed and molded, the surface is flat and compact, has no smearing mark, exposed stones, sand holes and air bubbles, has certain roughness, and the pass rate of the detected flatness reaches 100 percent; napping after plastering, wherein the texture is vertical to the central line of the road; and after the galling is finished, spraying a concrete preservative on the surface of the concrete to protect the surface of the concrete and covering a film for covering and curing.
The invention has the advantages that:
(1) the method establishes the 3D road digital model, performs data analysis on the source pavement on the basis of the 3D road digital model, provides accurate data support for subsequent simulated reduction operation, and ensures the accuracy of reduction;
(2) the regular road sections and the irregular road sections are divided into blocks, so that the subsequent regular road sections and the irregular road sections are restored by adopting different imitation methods, the construction difficulty is reduced, and the construction period is shortened;
(3) the regular road section of the invention realizes imitation by adopting a mode of paving a prefabricated block male die, a reproduction female die and a road deck, and realizes the following steps of 1: 1, copying and restoring, and prefabricating a block prefabricated block male die, so that domestic transportation is facilitated from a source road surface of a foreign country;
(4) according to the invention, the irregular road section is imitated by a special-shaped steel die simulation contour line cut by laser to realize imitation in a cast-in-place mode, and the on-site construction assembly combination with the regular road section is realized, so that the imitation reduction accuracy is high.
Drawings
FIG. 1 is a schematic view of the construction of a male mold-copying female mold of the present invention.
FIG. 2 is a schematic structural diagram of the deformed steel form of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A simulation reduction method for special roads in an automobile test yard comprises the following steps:
(1) and establishing a 3D road digital model: firstly, scanning by adopting a photographing type three-dimensional scanner to obtain three-dimensional laser dot matrix cloud information of a source pavement, namely projecting specific grating stripes onto the surface of the source pavement by adopting visible light emitted by a 3D laser scanner, photographing the grating stripes by virtue of two CCD (charge coupled device) digital cameras with high resolution and included angles formed between the two CCD digital cameras, finally processing photographed images to extract phase information of complete point cloud so as to obtain the three-dimensional laser dot matrix cloud information of the source pavement, and finally establishing a 3D road digital model according to the three-dimensional laser dot matrix cloud information;
(2) and block division: performing block segmentation on the generated 3D road digital model, generating contour surfaces of the blocks by regular road sections, and generating contour lines on two sides of the blocks by irregular road sections;
(3) and manufacturing a road panel of the regular road section: for blocks of regular road sections, processing the blocks into templates by adopting a 3D printing technology according to profile data of the blocks, pouring according to the templates to form block prefabricated block male molds, splicing the block prefabricated block male molds into male molds, then copying female molds 2 according to the male molds 1, using the copied female molds 2 as bottom molds, copying to prefabricate road outgoing panels, and then hoisting and paving the road outgoing panels in a road;
the method comprises the following specific steps of copying a female die 2 by a male die 1:
(a) cleaning a male die: before the mold turnover prefabrication, a soft hairbrush and a blower are used for cleaning dust and sundries on the surface of the male mold 1, so that the surface characteristic block of the male mold is prevented from being damaged;
(b) in the process of copying the female die by the male die, the male die 1 is positioned at the lower part, the copied female die 2 is positioned at the upper part (see figure 1), the surface of the male die 1 at the lower part is cleaned, a first-time release agent is coated, a second-time release agent is coated before the steel mesh is bound, the second-time release agent is carefully and uniformly coated, the first-time deposited release agent is completely swept, a small number of parts which are not coated with the release agent are uniformly coated, and the steel mesh is bound on the male die 1 after the second-time release agent is coated;
(c) after the template of the female die 2 is erected, the template is firmly connected and fixed by using a steel pipe scaffold, so that slurry leakage in the pouring process is prevented;
(d) after the template is reinforced, slowly pouring concrete to prevent the concrete from impacting the surface of the template and the reinforcing meshes, during pouring, pouring layer by layer, and after the first layer of concrete is poured and laid manually, pouring the concrete to the top of the template;
(e) after pouring is finished, the vibrating rod is obliquely inserted into the concrete for vibrating, after vibrating, a scraping ruler is used for drawing a plane, the flatness of the surface is guaranteed, and finally, geotextile is covered in time, water is sprayed for maintaining, and cracks of the concrete due to temperature difference are prevented;
(f) after the curing period is finished, a jack is fixed between the embedded parts corresponding to the male die and the female die up and down, so that the male die 1 and the copied female die 2 are subjected to jacking separation;
(4) and manufacturing an irregular road section panel: for the blocks of irregular road sections, the contour lines on the two sides of the block are simulated by the special-shaped steel template through laser cutting, firstly, the layer height line formed by longitudinal section of steel plate to be cut is divided into sections by adopting horizontal dividing line, then the sections are numbered, the laser equipment can be used for identifying number data and making laser cutting of special-shaped steel template with correspondent shape, after the laser cutting is completed, a transverse rib plate 4 and a plurality of vertical rib plates 5 (see figure 2) are welded and fixed on the inner side surface of the deformed steel template 3, the transverse rib plate 4 is adjacent to the upper edge of the deformed steel template 3, the top ends and the bottom ends of the plurality of vertical rib plates 5 are respectively flush with the top end and the bottom end of the deformed steel template 3, then transporting the welded deformed steel template to a road for cast-in-situ molding of a road slab, the formwork erection, reinforcement cage binding and concrete pouring are carried out in sequence, and after the concrete pouring is finished, secondary plastering is carried out: the first time is rough and flat and is used for expelling bleeding and pressing stones down to ensure that the surface has a better surface, the second time is fine and flat, when the concrete is in an initial setting state and the surface is still wet, the concrete is longitudinally and transversely checked by a long straight ruler, and the concrete is smeared for four times while being checked; after the concrete surface layer is leveled, smoothed and molded, the surface is flat and compact, has no smearing mark, exposed stones, sand holes and air bubbles, has certain roughness, and the pass rate of the detected flatness reaches 100 percent; napping after plastering, wherein the texture is vertical to the central line of the road; and after the galling is finished, spraying a concrete preservative on the surface of the concrete to protect the surface of the concrete and covering a film for covering and curing.
Wherein, foretell steel sheet thickness of waiting to cut is 5mm, adopts the steel sheet of 2.5m layer height to carry out the segmentation and serial number during the cutting, and horizontal rib plate 4 and perpendicular rib plate 5 are width 5cm, thickness 5 mm's steel sheet, and the distance between the adjacent perpendicular rib plate 5 on the deformed steel template 3 is 60cm, and during the template founds the mould, sets up 20cm high channel-section steel and the perpendicular rib plate 5 welded fastening on the deformed steel template in the 3 bottom of deformed steel template, ensures that the deformed steel template is whole reliably not hard up.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A simulation reduction method for special roads in an automobile test yard is characterized by comprising the following steps: the method comprises the following steps:
(1) and establishing a 3D road digital model: firstly, scanning by adopting a photographing type three-dimensional scanner to obtain three-dimensional laser dot matrix cloud information of a source pavement, and then establishing a 3D road digital model according to the three-dimensional laser dot matrix cloud information;
(2) and block division: performing block segmentation on the generated 3D road digital model, generating contour surfaces of the blocks by regular road sections, and generating contour lines on two sides of the blocks by irregular road sections;
(3) and manufacturing a road panel of the regular road section: for blocks of regular road sections, processing the blocks into templates by adopting a 3D printing technology according to profile data of the blocks, pouring according to the templates to form block prefabricated block male molds, splicing the block prefabricated block male molds into male molds, copying female molds according to the male molds, using the copied female molds as bottom molds, copying to prefabricate road outgoing panels, and hoisting and paving the road outgoing panels in a road;
(4) and manufacturing an irregular road section panel: for the blocks of irregular road sections, the contour lines on the two sides of the blocks are simulated by the special-shaped steel templates through laser cutting, and then the special-shaped steel templates are transported to the road to carry out cast-in-place molding of the road deck, namely, vertical molding, reinforcement cage binding, concrete pouring and curing molding are carried out in sequence.
2. The imitation reduction method for the special road of the automobile test yard according to claim 1, characterized in that: in the step (1), the specific scanning operation of the photographing type three-dimensional scanner is as follows: the method comprises the steps of projecting specific grating stripes onto the surface of a source road surface by adopting visible light emitted by a 3D laser scanner, photographing the grating stripes by means of two CCD digital cameras with high resolution and included angles formed between the two CCD digital cameras, and finally processing photographed images to extract phase information of complete point clouds, so that three-dimensional laser dot matrix cloud information of the source road surface is obtained.
3. The imitation reduction method for the special road of the automobile test yard according to claim 1, characterized in that: in the step (3), the male die copying female die comprises the following specific steps:
(a) cleaning a male die: before the mold turnover prefabrication, a soft hairbrush and a blower are used for cleaning dust and sundries on the surface of the male mold, so that the surface characteristic block of the male mold is prevented from being damaged;
(b) in the process of copying the female die by the male die, the male die is positioned at the lower part, the copied female die is positioned at the upper part, the surface of the male die at the lower part is cleaned, then a first-time release agent is smeared, a second-time release agent is smeared before binding the steel bar mesh, the smearing process of the second time needs to be careful and uniform, the first-time deposited release agent needs to be completely swept away, a small number of parts which are not smeared with the release agent are smeared uniformly, and after the second-time release agent is smeared, the steel bar mesh is bound on the male die;
(c) after the template of the female die is erected, the template is firmly connected and fixed by using a steel pipe scaffold, so that slurry leakage in the pouring process is prevented;
(d) after the template is reinforced, slowly pouring concrete to prevent the concrete from impacting the surface of the template and the reinforcing meshes, during pouring, pouring layer by layer, and after the first layer of concrete is poured and laid manually, pouring the concrete to the top of the template;
(e) after pouring is finished, the vibrating rod is obliquely inserted into the concrete for vibrating, after vibrating, a scraping ruler is used for drawing a plane, the flatness of the surface is guaranteed, and finally, geotextile is covered in time, water is sprayed for maintaining, and cracks of the concrete due to temperature difference are prevented;
(f) and after the curing period is finished, a jack is fixed between the embedded parts which are vertically corresponding to the two sides of the male die and the female die, so that the male die and the copied female die are subjected to jacking separation.
4. The imitation reduction method for the special road of the automobile test yard according to claim 1, characterized in that: in the step (4), the specific steps of laser cutting the special-shaped steel template are as follows: firstly, segmenting a layer height line formed by a longitudinal section of a steel plate to be cut by adopting a horizontal segmentation line, numbering after segmentation, and identifying numbering data by laser equipment and carrying out laser cutting on a deformed steel template with a corresponding shape; after laser cutting is finished, a transverse rib plate and a plurality of vertical rib plates are fixedly welded on the inner side surface of the deformed steel template, the transverse rib plate is adjacent to the upper edge of the deformed steel template, and the top ends and the bottom ends of the plurality of vertical rib plates are respectively flush with the top end and the bottom end of the deformed steel template.
5. The imitation reduction method for the special road of the automobile test yard as claimed in claim 4, wherein the imitation reduction method comprises the following steps: the thickness of the steel plate to be cut is 5mm, the steel plate with 2.5m layer height is segmented and numbered during cutting, the transverse rib plates and the vertical rib plates are steel plates with the width of 5cm and the thickness of 5mm, the distance between the adjacent vertical rib plates on the deformed steel template is 60cm, and when the template is erected, the channel steel with the height of 20cm is arranged at the bottom end of the deformed steel template and the vertical rib plates on the deformed steel template are welded and fixed, so that the deformed steel template is ensured to be integrally reliable and not to be loosened.
6. The imitation reduction method for the special road of the automobile test yard according to claim 1, characterized in that: in the step (4), after the concrete pouring is finished, secondary plastering is carried out: the first time is rough and flat and is used for expelling bleeding and pressing stones down to ensure that the surface has a better surface, the second time is fine and flat, when the concrete is in an initial setting state and the surface is still wet, the concrete is longitudinally and transversely checked by a long straight ruler, and the concrete is smeared for four times while being checked; after the concrete surface layer is leveled, smoothed and molded, the surface is flat and compact, has no smearing mark, exposed stones, sand holes and air bubbles, has certain roughness, and the pass rate of the detected flatness reaches 100 percent; napping after plastering, wherein the texture is vertical to the central line of the road; and after the galling is finished, spraying a concrete preservative on the surface of the concrete to protect the surface of the concrete and covering a film for covering and curing.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116005510A (en) * | 2022-12-20 | 2023-04-25 | 中交一公局集团有限公司 | Construction method of chessboard type mixed pavement of automobile test field |
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