Track plate laying precision control method and device based on three-dimensional scanning

Abstract

The invention discloses a track board laying precision control method and device based on three-dimensional scanning, and relates to the technical field of bridge construction.The method comprises the following steps that three-dimensional coordinates of a whole railway deck are constructed, and the actual concrete dosage for pouring a reinforced concrete base is counted; obtaining angular point coordinates of the reinforced concrete base by combining the three-dimensional coordinates of the whole railway bridge floor; based on the angular point coordinates of the reinforced concrete base and the actual concrete dosage, a thickness adjusting strategy of the reinforced concrete base, the self-compacting concrete and the prefabricated track plate is obtained through analysis; and based on the thickness adjusting strategy of the reinforced concrete base, the self-compacting concrete and the prefabricated track plates, the padding amount of the thickness of each prefabricated track plate is obtained through calculation. Through the three-dimensional scanning and point cloud modeling technology, the plane state and the three-dimensional coordinates of the railway deck are obtained, the positioning height of the prefabricated track plate is rapidly calculated, initial adjustment and fine adjustment of the prefabricated track plate are achieved, and the efficiency of bridge construction work is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction, and in particular to a method and device for controlling track slab laying accuracy based on three-dimensional scanning. Background Art

[0002] RTS-III slab ballastless track is a high-speed rail construction technology with complete intellectual property rights in China, which demonstrates the technical level of my country's high-speed rail and the country's comprehensive strength. The structural scheme of this track slab is a new unit slab ballastless track structure with shoulders, mainly composed of rails, fasteners, prefabricated track slabs, reinforced self-compacting concrete (self-leveling concrete adjustment layer), limit stops, intermediate isolation layer (geotextile) and reinforced concrete base.

[0003] In order to ensure the safe operation of high-speed railways, the RTS-III slab track needs to have extremely high flatness. At present, many large-span cable-stayed bridges with a main span of more than 400m in China use the RTS-III slab track structure. However, the deck alignment of cable-stayed bridges is greatly affected by temperature, wind speed, and temporary loads during the construction process, causing large fluctuations in the deck alignment at different time periods, which makes it difficult to position the RTS-III slab track on the bridge deck during construction, and easily makes the final smoothness of the bridge deck poor, affecting the operation of high-speed railway trains, and even requiring the train to slow down to pass through the bridge deck.

[0004] In order to ensure the laying accuracy of CRTS III slab track, the total station is mainly used to measure and lay out the railway bridge deck. The workload is huge, and a large amount of measurement data is needed to determine the relationship between environmental factors such as temperature and wind speed and the railway bridge deck line shape. At the same time, the total station measurement points are relatively small, and a large amount of railway bridge deck coordinate information cannot be obtained.

[0005] Therefore, in order to meet actual needs, a track slab laying accuracy control technology based on three-dimensional scanning is provided. Summary of the invention

[0006] In view of the defects existing in the prior art, the purpose of the present invention is to provide a method and device for track slab laying accuracy control based on three-dimensional scanning. Through three-dimensional scanning and point cloud modeling technology, the plane state and three-dimensional coordinates of the railway bridge deck are obtained, and then the positioning height of the prefabricated track slab is quickly calculated, so as to realize the initial adjustment and fine adjustment of the prefabricated track slab, and effectively improve the efficiency of bridge construction work.

[0007] In order to achieve the above purpose, the technical solution adopted by the present invention is:

[0008] In a first aspect, the present application provides a track slab laying accuracy control method based on three-dimensional scanning, the method comprising the following steps:

[0009] Construct the three-dimensional coordinates of the entire railway bridge deck, determine the initial smoothness of the railway deck, and calculate the actual amount of concrete used to cast the reinforced concrete base;

[0010] Combined with the three-dimensional coordinates of the entire railway bridge deck, the coordinates of the corner points of the reinforced concrete base are obtained;

[0011] Based on the coordinates of the corner points of the reinforced concrete base and the actual amount of concrete used, combined with the three-dimensional scanning of the track slab thickness information, the thickness adjustment strategy of the reinforced concrete base, self-compacting concrete and prefabricated track slab is analyzed and obtained;

[0012] Based on the thickness adjustment strategy of reinforced concrete base, self-compacting concrete and precast track slab, the padding amount of each precast track slab is calculated.

[0013] On the basis of the above technical solution, the three-dimensional coordinates of the entire railway bridge deck are constructed, including the following steps:

[0014] Set measurement reference points at the mid-span of the railway bridge deck and on the main towers on both sides and set the three-dimensional coordinates of the measurement reference points;

[0015] The railway bridge deck is scanned 360° in three dimensions based on the measurement reference points in the mid-span and the main towers on both sides to obtain the point cloud data corresponding to the railway bridge deck;

[0016] Based on the point cloud data corresponding to the railway bridge deck, a three-dimensional model of the railway bridge deck is obtained, and combined with the three-dimensional coordinates of the measurement reference points, the three-dimensional coordinates of the entire railway bridge deck are obtained.

[0017] On the basis of the above technical solution, when a 360° three-dimensional scan is performed on the railway bridge deck based on the measurement reference points at the mid-span and the main towers on both sides respectively, the scanning range corresponding to each of the measurement reference points at least covers the entire area of ​​the railway bridge deck and the other two measurement reference points.

[0018] On the basis of the above technical solution, the method further comprises the following steps:

[0019] The longitudinal edge line of the slab-type ballastless track slab of the set model is selected as the baseline. The three-dimensional coordinates of the baseline are extracted through three-dimensional scanning with a preset scanning cycle, and a regular curve of the baseline line shape and temperature change is formed to estimate the baseline line shape at the bridge design reference temperature of 20 degrees.

[0020] Based on the baseline alignment of the bridge at a design reference temperature of 20 degrees, the initial longitudinal alignment of the railway bridge deck at a design reference temperature of 20 degrees is obtained. Combined with the baseline alignment obtained by 3D scanning, the initial smoothness of the railway bridge deck is determined, and the actual amount of concrete used for casting the reinforced concrete base is calculated.

[0021] On the basis of the above technical solution, the method further comprises the following steps:

[0022] Combined with the three-dimensional coordinates of the entire railway bridge deck, the three-dimensional coordinates of the four corner points of each reinforced concrete base are obtained, and then the coordinates of the corner points of the reinforced concrete base are obtained.

[0023] In a second aspect, the present application further provides a track slab laying accuracy control device based on three-dimensional scanning, the device comprising:

[0024] The actual concrete usage calculation module is used to construct the three-dimensional coordinates of the entire railway bridge deck, determine the initial smoothness of the railway deck, and calculate the actual concrete usage for pouring the reinforced concrete base;

[0025] A corner point coordinate calculation module, which is used to obtain the corner point coordinates of the reinforced concrete base in combination with the three-dimensional coordinates of the entire railway bridge deck;

[0026] Thickness adjustment strategy acquisition module, which is used to analyze and obtain the thickness adjustment strategy of the reinforced concrete base, self-compacting concrete and prefabricated track slab based on the corner point coordinates of the reinforced concrete base and the actual concrete usage, combined with the three-dimensional scanning of the track slab thickness information;

[0027] The thickness padding calculation module is used to calculate the padding amount of the thickness of each prefabricated track slab based on the thickness adjustment strategy of the reinforced concrete base, self-compacting concrete and prefabricated track slab.

[0028] On the basis of the above technical solution, a measurement reference point measurement module is used to perform 360° three-dimensional scanning of the railway bridge deck based on the measurement reference points of the mid-span and the main towers on both sides, and obtain point cloud data corresponding to the railway bridge deck;

[0029] A three-dimensional coordinate calculation module is used to obtain a three-dimensional model of the railway bridge deck based on the point cloud data corresponding to the railway bridge deck, and to obtain the three-dimensional coordinates of the entire railway bridge deck in combination with the three-dimensional coordinates of the measurement reference points; wherein,

[0030] The measurement reference points are set at the mid-span of the railway bridge deck and on the main towers on both sides, and their three-dimensional coordinates are known.

[0031] On the basis of the above technical solution, when a 360° three-dimensional scan is performed on the railway bridge deck based on the measurement reference points at the mid-span and the main towers on both sides respectively, the scanning range corresponding to each of the measurement reference points at least covers the entire area of ​​the railway bridge deck and the other two measurement reference points.

[0032] On the basis of the above technical solution, the actual concrete consumption calculation module is also used to select the longitudinal edge line of the set model of the slab-type ballastless track slab as the baseline, extract the three-dimensional coordinates of the baseline through three-dimensional scanning of a preset scanning cycle, form a regular curve of the baseline line shape and temperature change, and infer the baseline line shape at the bridge design reference temperature of 20 degrees;

[0033] The actual concrete usage calculation module is also used to obtain the initial longitudinal alignment of the railway bridge deck at a bridge design reference temperature of 20 degrees based on the baseline alignment at a bridge design reference temperature of 20 degrees, and to determine the initial smoothness of the railway bridge deck in combination with the baseline alignment obtained by three-dimensional scanning, and to calculate the actual concrete usage for casting the reinforced concrete base.

[0034] On the basis of the above technical solution, the corner point coordinate calculation module is also used to obtain the three-dimensional coordinates of the four corner points of each reinforced concrete base in combination with the three-dimensional coordinates of the entire railway bridge deck, and then obtain the corner point coordinates of the reinforced concrete base.

[0035] Compared with the prior art, the advantages of the present invention are:

[0036] The present invention obtains the plane state and three-dimensional coordinates of the railway bridge deck through three-dimensional scanning and point cloud modeling technology, and then quickly calculates the positioning height of the prefabricated track slab, so as to realize the initial adjustment and fine adjustment of the prefabricated track slab, effectively improving the efficiency of bridge construction work. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0038] Figure 1 It is a principle structure diagram of a CRTS III type slab ballastless track slab in a track slab laying accuracy control method based on three-dimensional scanning according to an embodiment of the present invention;

[0039] Figure 2 This is a flowchart of the steps of a track slab laying accuracy control method based on three-dimensional scanning according to an embodiment of the present invention;

[0040] Figure 3 It is a structural block diagram of a track slab laying accuracy control device based on three-dimensional scanning according to an embodiment of the present invention. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0042] The embodiments of the present invention are further described in detail below with reference to the accompanying drawings.

[0043] The embodiment of the present application provides a method and device for controlling the accuracy of track slab laying based on three-dimensional scanning. Through three-dimensional scanning and point cloud modeling technology, the plane state and three-dimensional coordinates of the railway bridge deck are obtained, and then the positioning height of the prefabricated track slab is quickly calculated, so as to realize the initial adjustment and fine adjustment of the prefabricated track slab, effectively improving the efficiency of bridge construction work.

[0044] In order to achieve the above technical effects, the overall idea of ​​this application is as follows:

[0045] A track slab laying accuracy control method based on three-dimensional scanning, the track slab laying accuracy control method based on three-dimensional scanning comprises the following steps:

[0046] S1. Construct the three-dimensional coordinates of the entire railway bridge deck, determine the initial smoothness of the railway deck, and calculate the actual amount of concrete used for pouring the reinforced concrete base;

[0047] S2. Combining the three-dimensional coordinates of the entire railway bridge deck, obtain the coordinates of the corner points of the reinforced concrete base;

[0048] S3. Based on the coordinates of the corner points of the reinforced concrete base and the actual amount of concrete used, combined with the three-dimensional scanning of the track slab thickness information, the thickness adjustment strategy of the reinforced concrete base, self-compacting concrete and prefabricated track slab is analyzed and obtained;

[0049] S4. Based on the thickness adjustment strategy of the reinforced concrete base, self-compacting concrete and prefabricated track slab, the thickness padding amount of each prefabricated track slab is calculated.

[0050] The embodiments of the present application are further described in detail below in conjunction with the accompanying drawings.

[0051] First, see Figures 1-2 As shown, the embodiment of the present application provides a track plate laying accuracy control method based on three-dimensional scanning, the method comprising the following steps:

[0052] S1. Construct the three-dimensional coordinates of the entire railway bridge deck, determine the initial smoothness of the railway deck, and calculate the actual amount of concrete used for pouring the reinforced concrete base;

[0053] S2. Combining the three-dimensional coordinates of the entire railway bridge deck, obtain the coordinates of the corner points of the reinforced concrete base;

[0054] S3. Based on the coordinates of the corner points of the reinforced concrete base and the actual amount of concrete used, combined with the three-dimensional scanning of the track slab thickness information, the thickness adjustment strategy of the reinforced concrete base, self-compacting concrete and prefabricated track slab is analyzed and obtained;

[0055] S4. Based on the thickness adjustment strategy of the reinforced concrete base, self-compacting concrete and prefabricated track slab, the thickness padding amount of each prefabricated track slab is calculated.

[0056] In the embodiment of the present application, the plane state and three-dimensional coordinates of the railway bridge deck are obtained through three-dimensional scanning and point cloud modeling technology, and then the positioning height of the prefabricated track slab is quickly calculated to achieve initial adjustment and fine adjustment of the prefabricated track slab, effectively improving the efficiency of bridge construction work.

[0057] Furthermore, the three-dimensional coordinates of the entire railway bridge deck are constructed, including the following steps:

[0058] Set measurement reference points at the mid-span of the railway bridge deck and on the main towers on both sides and set the three-dimensional coordinates of the measurement reference points;

[0059] The railway bridge deck is scanned 360° in three dimensions based on the measurement reference points in the mid-span and the main towers on both sides to obtain the point cloud data corresponding to the railway bridge deck;

[0060] Based on the point cloud data corresponding to the railway bridge deck, a three-dimensional model of the railway bridge deck is obtained, and combined with the three-dimensional coordinates of the measurement reference points, the three-dimensional coordinates of the entire railway bridge deck are obtained.

[0061] Furthermore, when a 360° three-dimensional scan is performed on the railway bridge deck based on the measurement reference points at the mid-span and the main towers on both sides respectively, the scanning range corresponding to each of the measurement reference points at least covers the entire area of ​​the railway bridge deck and the other two measurement reference points.

[0062] Furthermore, the method further comprises the following steps:

[0063] The longitudinal edge line of the slab-type ballastless track slab of the set model is selected as the baseline. The three-dimensional coordinates of the baseline are extracted through three-dimensional scanning with a preset scanning cycle, and a regular curve of the baseline line shape and temperature change is formed to estimate the baseline line shape at the bridge design reference temperature of 20 degrees.

[0064] Based on the baseline alignment of the bridge at a design reference temperature of 20 degrees, the initial longitudinal alignment of the railway bridge deck at a design reference temperature of 20 degrees is obtained. Combined with the baseline alignment obtained by 3D scanning, the initial smoothness of the railway bridge deck is determined, and the actual amount of concrete used for casting the reinforced concrete base is calculated.

[0065] Furthermore, the method further comprises the following steps:

[0066] Combined with the three-dimensional coordinates of the entire railway bridge deck, the three-dimensional coordinates of the four corner points of each reinforced concrete base are obtained, and then the coordinates of the corner points of the reinforced concrete base are obtained.

[0067] It should be noted that the core process of the embodiment of the present application is as follows:

[0068] Station construction method: Scanning and station construction are carried out before 3D scanning. A measuring station is set up in the middle of the span and on the railway bridge deck of the main towers on both sides. Two reference points are established on the tower bodies of the main towers on both sides (about 1.5m above the bridge deck). The coordinates of the reference points are known.

[0069] Scanning method: First, conduct a 360° three-dimensional scan on the railway bridge deck at the mid-span, and then conduct a 360° three-dimensional scan on the railway bridge deck near the two main towers in turn, to ensure that the scanning range can cover the railway bridge deck of the entire bridge and the reference points on the main tower body. Select two consecutive non-rainy days to conduct a three-dimensional scan of the railway bridge deck, scan once every 3 hours, and record the ambient temperature simultaneously during each scan.

[0070] Data processing method: After 3D scanning, point cloud data of the railway bridge deck is formed, and the point cloud data is processed to form a 3D model of the railway bridge deck. With the reference point as a reference, the 3D coordinates of the entire railway bridge deck are obtained.

[0071] Determination of initial smoothness of railway pavement: The longitudinal edge line of the CRTS III ballastless track slab was selected as the baseline. Through continuous 3D scanning for 2 days, the 3D coordinates of the baseline were extracted to form a regular curve of baseline linear shape and temperature change, and the baseline linear shape at the design reference temperature of 20 degrees was estimated. The initial longitudinal linear shape of the railway bridge deck at the design reference temperature of 20 degrees was obtained through design drawings and finite element calculations. Combined with the baseline linear shape of the 3D scanning, the initial smoothness of the railway bridge deck was determined, and the actual amount of concrete used for pouring the reinforced concrete base was calculated.

[0072] Rapid stakeout of reinforced concrete base: Combine the 3D coordinates of the entire railway bridge deck obtained by 3D scanning to obtain the 3D coordinates of the four corner points of each reinforced concrete base. Enter the coordinates into the GPS (Global Positioning System) using RTK (Real-time kinematic) to stake out the corner point position of each reinforced concrete base on the railway bridge deck. This method can quickly stake out the coordinates of the corner points of the reinforced concrete base.

[0073] Strategy for adjusting the thickness of reinforced concrete base: When the initial longitudinal line shape of the railway bridge deck at the design reference temperature of 20 degrees is higher than the measured baseline line shape H1, the casting height of the cast-in-place reinforced concrete base is increased by H1 (when H1 is greater than 3cm, the height is reduced by 3cm); conversely, when it is lower than the measured baseline line shape, the casting height of the cast-in-place reinforced concrete base is reduced.

[0074] Thickness adjustment strategy for self-compacting concrete and track slab: After the track slab and reinforced concrete base are demolded, the railway bridge deck alignment is re-scanned to obtain the alignment after the reinforced concrete base is poured. The theoretical longitudinal alignment of the railway bridge deck after pouring the concrete base at the bridge design reference temperature of 20 degrees is obtained through design drawings and finite element calculations, and compared with the measured alignment. When the measured alignment is higher than the theoretical alignment H2, the thickness of the self-compacting concrete is reduced. When H2 is greater than 1cm, the thickness of the precast track slab needs to be further reduced; when the measured alignment is lower than the theoretical alignment H3, the thickness of the self-compacting concrete is increased. When H3 is greater than 2cm, the thickness of the precast track slab needs to be further increased.

[0075] 3D scanning of track slab thickness information: Combined with step 8 and the designed thickness of the precast track slab, cast the precast track slab in the factory and number them, corresponding to their positions on the railway bridge deck. Use 3D scanning to scan the 3D information of the precast track slab (especially the thickness information).

[0076] Auxiliary strategies for initial and fine adjustment of track slabs. Based on the obtained linear conditions after the pouring of the reinforced concrete base and the thickness of the precast track slab, and the linear conditions after the thickness of the precast track slab is placed at the design reference temperature of 20 degrees for the bridge, the padding amount of the thickness of each precast track slab is calculated to guide the rapid initial and fine adjustment of the precast track slab.

[0077] In summary, the technical advantages of the above technical solution are:

[0078] Innovated the way of 3D scanning and station building for cable-stayed railway bridge deck and the method of 3D scanning;

[0079] The point cloud data of the railway bridge deck is formed through 3D scanning, and the 3D model of the railway bridge deck is formed to obtain the 3D coordinates of the entire railway bridge deck, determine the initial smoothness of the railway deck, and calculate the actual amount of concrete used for pouring the reinforced concrete base;

[0080] Combined with the 3D coordinates of the entire railway bridge deck obtained by 3D scanning, the corner coordinates of the reinforced concrete base are quickly staked out;

[0081] By comparing with the designed line shape and combining the 3D scanning of the track slab thickness information, the thickness adjustment strategy of the reinforced concrete base, self-compacting concrete and track slab is analyzed:

[0082] Calculate the thickness of each precast track slab to guide the quick initial adjustment and fine adjustment of the precast track slab.

[0083] The technical solution of the embodiment of the present application realizes the laying accuracy control of CRTS III type ballastless track slab based on three-dimensional scanning. Compared with total station measurement, the advantages are:

[0084] 1) It can determine the initial smoothness of the entire railway bridge deck and calculate the actual amount of concrete used in pouring the reinforced concrete base;

[0085] 2) Quickly obtain the coordinates of a large number of corner points of reinforced concrete bases to guide layout;

[0086] 3) Combined with RTK GPS for rapid stakeout, improving construction efficiency;

[0087] 4) By comparing the scanned line shape with the design theoretical line shape, adjust the thickness of the reinforced concrete base, prefabricated track slab, and self-compacting concrete layers;

[0088] 5) The thickness of each prefabricated track slab can be accurately calculated to guide the rapid initial adjustment and fine adjustment of the prefabricated track slab.

[0089] It should be noted that the technical solution of the embodiment of the present application applies a set of 3D scanning technology to the three main construction stages of the base of the ballastless track slab, the precast track slab, and the self-compacting concrete. Through rapid scanning and point cloud modeling, the plane state and 3D coordinates of the railway bridge deck are obtained, the processing of the precast track slab is guided and its 3D dimensions are obtained, the thickness selection of the self-compacting concrete is guided, and the positioning height of the precast track slab is quickly calculated to achieve the initial adjustment and fine adjustment of the precast track slab.

[0090] Taking the CRTS III slab track slab as an example, combined with the technical solution of the embodiment of the present application, a CRTS III slab track slab laying accuracy control method based on three-dimensional scanning is formed.

[0091] As shown in the attached figure of the specification Figure 1 As shown, in the construction of CRTS III slab-type ballastless track, the heights of three parts are mainly controlled, namely, the prefabricated track slab, the reinforced self-compacting concrete (self-leveling concrete adjustment layer), and the reinforced concrete base.

[0092] This method takes the above three aspects into consideration and includes the following steps:

[0093] In the first step, taking a large-span cable-stayed bridge with a main span of 400m as an example, when the main span of the large-span cable-stayed bridge is closed and the construction of the CRTS III type ballastless track slab begins, a 3D scanner is used to perform a 3D scan of the railway surface base, and the scanning radius of the scanner should be no less than 150m.

[0094] The second step is to conduct a scanning station before the 3D scanning. A measuring station is set up in the middle of the span and on the railway bridge deck of the main towers on both sides. Two reference points are established on the tower bodies of the main towers on both sides (about 1.5m above the bridge deck). The coordinates of the reference points are known. First, a 360° 3D scanning is performed on the railway bridge deck at the middle of the span, and then a 360° 3D scanning is performed on the railway bridge deck near the two main towers in turn to ensure that the scanning range can cover the railway bridge deck of the entire bridge and the reference points on the tower bodies of the main towers.

[0095] The third step is to select two consecutive non-rainy days to perform 3D scanning of the railway bridge deck, scanning every 3 hours, and recording the ambient temperature during each scan. After the 3D scanning, the point cloud data of the railway bridge deck is formed, and the point cloud data is processed to form a 3D model of the railway bridge deck. Using the reference point as a reference, the 3D coordinates of the entire railway bridge deck are obtained.

[0096] The fourth step is to select the longitudinal edge line of the CRTS III ballastless track slab as the baseline. Through two consecutive days of three-dimensional scanning, the three-dimensional coordinates of the baseline are extracted to form a regular curve of the baseline line shape and temperature change, and the baseline line shape at the bridge design reference temperature of 20 degrees is estimated.

[0097] The fifth step is to obtain the initial longitudinal line shape of the railway bridge deck at the design base temperature of 20 degrees through design drawings and finite element calculations. Combined with the baseline line shape of three-dimensional scanning, the initial smoothness of the railway bridge deck is determined, and the actual amount of concrete used for pouring the reinforced concrete base is calculated.

[0098] The sixth step is to obtain the three-dimensional coordinates of the entire railway bridge deck obtained by three-dimensional scanning, obtain the three-dimensional coordinates of the four corner points of each reinforced concrete base, enter the coordinates into the GPS using RTK, and stake out the corner point position of each reinforced concrete base on the railway bridge deck. This method can quickly stake out the coordinates of the corner points of the reinforced concrete base.

[0099] The seventh step is to set up the casting formwork and cast the reinforced concrete base. When the initial longitudinal alignment of the railway bridge deck at the design reference temperature of 20 degrees is higher than the measured baseline alignment H1, the casting height of the cast-in-place reinforced concrete base is increased by H1 (when H1 is greater than 3cm, the height is reduced by 3cm); conversely, when it is lower than the measured baseline alignment, the casting height of the cast-in-place reinforced concrete base is reduced.

[0100] Step 8. After the reinforced concrete base is demolded, the railway bridge deck alignment is re-scanned according to the requirements of step 3 to obtain the alignment after the reinforced concrete base is poured. The theoretical longitudinal alignment of the railway bridge deck after pouring the concrete base at the design reference temperature of 20 degrees is obtained through design drawings and finite element calculations, and compared with the measured alignment. When the measured alignment is higher than the theoretical alignment H2, the thickness of the self-compacting concrete casting is reduced. When H2 is greater than 1cm, the thickness of the precast track slab needs to be further reduced; when the measured alignment is lower than the theoretical alignment H3, the thickness of the self-compacting concrete casting is increased. When H3 is greater than 2cm, the thickness of the precast track slab needs to be further increased.

[0101] In the ninth step, in combination with the ninth step and the designed thickness of the precast track slab, the precast track slab is cast in the factory and numbered, corresponding to its position on the railway bridge deck. The three-dimensional information (especially the thickness information) of the precast track slab is scanned by three-dimensional scanning.

[0102] The tenth step is to calculate the height increase of each precast track slab based on the linear condition of the reinforced concrete base after pouring and the thickness of the precast track slab obtained in the eighth step, and the linear condition after placing the precast track slab at the design reference temperature of 20 degrees Celsius. This is used to guide the rapid initial and fine adjustment of the precast track slab.

[0103] Second, see Figure 3 As shown, an embodiment of the present application provides a track plate laying accuracy control device based on three-dimensional scanning, the device comprising:

[0104] The actual concrete usage calculation module is used to construct the three-dimensional coordinates of the entire railway bridge deck, determine the initial smoothness of the railway deck, and calculate the actual concrete usage for pouring the reinforced concrete base;

[0105] A corner point coordinate calculation module, which is used to obtain the corner point coordinates of the reinforced concrete base in combination with the three-dimensional coordinates of the entire railway bridge deck;

[0106] Thickness adjustment strategy acquisition module, which is used to analyze and obtain the thickness adjustment strategy of the reinforced concrete base, self-compacting concrete and prefabricated track slab based on the corner point coordinates of the reinforced concrete base and the actual concrete usage, combined with the three-dimensional scanning of the track slab thickness information;

[0107] The thickness padding calculation module is used to calculate the padding amount of the thickness of each prefabricated track slab based on the thickness adjustment strategy of the reinforced concrete base, self-compacting concrete and prefabricated track slab.

[0108] In the embodiment of the present application, the plane state and three-dimensional coordinates of the railway bridge deck are obtained through three-dimensional scanning and point cloud modeling technology, and then the positioning height of the prefabricated track slab is quickly calculated to achieve initial adjustment and fine adjustment of the prefabricated track slab, effectively improving the efficiency of bridge construction work.

[0109] Furthermore, a measurement reference point measurement module is used to perform 360° three-dimensional scanning of the railway bridge deck based on the measurement reference points of the mid-span and the main towers on both sides in turn, to obtain point cloud data corresponding to the railway bridge deck;

[0110] A three-dimensional coordinate calculation module is used to obtain a three-dimensional model of the railway bridge deck based on the point cloud data corresponding to the railway bridge deck, and to obtain the three-dimensional coordinates of the entire railway bridge deck in combination with the three-dimensional coordinates of the measurement reference points; wherein,

[0111] The measurement reference points are set at the mid-span of the railway bridge deck and on the main towers on both sides, and their three-dimensional coordinates are known.

[0112] Furthermore, when a 360° three-dimensional scan is performed on the railway bridge deck based on the measurement reference points at the mid-span and the main towers on both sides respectively, the scanning range corresponding to each of the measurement reference points at least covers the entire area of ​​the railway bridge deck and the other two measurement reference points.

[0113] Furthermore, the actual concrete usage calculation module is also used to select the longitudinal edge line of the set model of the slab-type ballastless track slab as the baseline, extract the three-dimensional coordinates of the baseline through three-dimensional scanning of a preset scanning cycle, form a regular curve of the baseline line shape and temperature change, and infer the baseline line shape at the bridge design reference temperature of 20 degrees;

[0114] The actual concrete usage calculation module is also used to obtain the initial longitudinal alignment of the railway bridge deck at a bridge design reference temperature of 20 degrees based on the baseline alignment at a bridge design reference temperature of 20 degrees, and to determine the initial smoothness of the railway bridge deck in combination with the baseline alignment obtained by three-dimensional scanning, and to calculate the actual concrete usage for casting the reinforced concrete base.

[0115] Furthermore, the corner point coordinate calculation module is also used to obtain the three-dimensional coordinates of the four corner points of each reinforced concrete base in combination with the three-dimensional coordinates of the entire railway bridge deck, and then obtain the corner point coordinates of the reinforced concrete base.

[0116] It should be noted that the track plate laying precision control device based on three-dimensional scanning mentioned in the second aspect is similar to the technical principle of the track plate laying precision control method based on three-dimensional scanning mentioned in the first aspect in terms of technical issues, technical means and technical effects, and will not be elaborated here.

[0117] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0118] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0119] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A track slab laying accuracy control method based on three-dimensional scanning, characterized in that: The method comprises the following steps: Construct the three-dimensional coordinates of the entire railway bridge deck, determine the initial smoothness of the railway deck, and calculate the actual amount of concrete used to cast the reinforced concrete base; Combined with the three-dimensional coordinates of the entire railway bridge deck, the coordinates of the corner points of the reinforced concrete base are obtained; Based on the coordinates of the corner points of the reinforced concrete base and the actual amount of concrete used, combined with the three-dimensional scanning of the track slab thickness information, the thickness adjustment strategy of the reinforced concrete base, self-compacting concrete and prefabricated track slab is analyzed and obtained; Based on the thickness adjustment strategy of reinforced concrete base, self-compacting concrete and precast track slab, the padding amount of each precast track slab is calculated.

2. The track slab laying accuracy control method based on three-dimensional scanning according to claim 1, characterized in that: The three-dimensional coordinates of the entire railway bridge deck are constructed, including the following steps: Set measurement reference points at the mid-span of the railway bridge deck and on the main towers on both sides and set the three-dimensional coordinates of the measurement reference points; The railway bridge deck is scanned 360° in three dimensions based on the measurement reference points in the mid-span and the main towers on both sides to obtain the point cloud data corresponding to the railway bridge deck; Based on the point cloud data corresponding to the railway bridge deck, a three-dimensional model of the railway bridge deck is obtained, and combined with the three-dimensional coordinates of the measurement reference points, the three-dimensional coordinates of the entire railway bridge deck are obtained.

3. The track slab laying accuracy control method based on three-dimensional scanning according to claim 2, characterized in that: When the railway bridge deck is scanned 360° three-dimensionally based on the measurement reference points at the mid-span and the main towers on both sides respectively, the scanning range corresponding to each of the measurement reference points at least covers the entire area of ​​the railway bridge deck and the other two measurement reference points.

4. The track slab laying accuracy control method based on three-dimensional scanning according to claim 1, characterized in that: The method further comprises the following steps: The longitudinal edge line of the slab-type ballastless track slab of the set model is selected as the baseline. The three-dimensional coordinates of the baseline are extracted through three-dimensional scanning with a preset scanning cycle, and a regular curve of the baseline line shape and temperature change is formed to estimate the baseline line shape at the bridge design reference temperature of 20 degrees. Based on the baseline alignment of the bridge at a design reference temperature of 20 degrees, the initial longitudinal alignment of the railway bridge deck at a design reference temperature of 20 degrees is obtained. Combined with the baseline alignment obtained by 3D scanning, the initial smoothness of the railway bridge deck is determined, and the actual amount of concrete used for casting the reinforced concrete base is calculated.

5. The track slab laying accuracy control method based on three-dimensional scanning according to claim 1, characterized in that: The method further comprises the following steps: Combined with the three-dimensional coordinates of the entire railway bridge deck, the three-dimensional coordinates of the four corner points of each reinforced concrete base are obtained, and then the coordinates of the corner points of the reinforced concrete base are obtained.

6. A track slab laying accuracy control device based on three-dimensional scanning, characterized in that: The device comprises: The actual concrete usage calculation module is used to construct the three-dimensional coordinates of the entire railway bridge deck, determine the initial smoothness of the railway deck, and calculate the actual concrete usage for pouring the reinforced concrete base; A corner point coordinate calculation module, which is used to obtain the corner point coordinates of the reinforced concrete base in combination with the three-dimensional coordinates of the entire railway bridge deck; Thickness adjustment strategy acquisition module, which is used to analyze and obtain the thickness adjustment strategy of the reinforced concrete base, self-compacting concrete and prefabricated track slab based on the corner point coordinates of the reinforced concrete base and the actual concrete usage, combined with the three-dimensional scanning of the track slab thickness information; The thickness padding calculation module is used to calculate the padding amount of the thickness of each prefabricated track slab based on the thickness adjustment strategy of the reinforced concrete base, self-compacting concrete and prefabricated track slab.

7. The track slab laying accuracy control device based on three-dimensional scanning according to claim 6, characterized in that: The measurement reference point measurement module is used to perform 360° three-dimensional scanning of the railway bridge deck based on the measurement reference points of the mid-span and the main towers on both sides, and obtain point cloud data corresponding to the railway bridge deck; A three-dimensional coordinate calculation module is used to obtain a three-dimensional model of the railway bridge deck based on the point cloud data corresponding to the railway bridge deck, and to obtain the three-dimensional coordinates of the entire railway bridge deck in combination with the three-dimensional coordinates of the measurement reference points; wherein, The measurement reference points are set at the mid-span of the railway bridge deck and on the main towers on both sides, and their three-dimensional coordinates are known.

8. The track slab laying accuracy control device based on three-dimensional scanning according to claim 7, characterized in that: When the railway bridge deck is scanned 360° three-dimensionally based on the measurement reference points at the mid-span and the main towers on both sides respectively, the scanning range corresponding to each of the measurement reference points at least covers the entire area of ​​the railway bridge deck and the other two measurement reference points.

9. The track slab laying accuracy control device based on three-dimensional scanning according to claim 6, characterized in that: The actual concrete usage calculation module is also used to select the longitudinal edge line of the set model of the slab-type ballastless track slab as the baseline, extract the three-dimensional coordinates of the baseline through three-dimensional scanning of a preset scanning cycle, form a regular curve of the baseline line shape and temperature change, and infer the baseline line shape at the bridge design reference temperature of 20 degrees; The actual concrete usage calculation module is also used to obtain the initial longitudinal alignment of the railway bridge deck at a bridge design reference temperature of 20 degrees based on the baseline alignment at a bridge design reference temperature of 20 degrees, and to determine the initial smoothness of the railway bridge deck in combination with the baseline alignment obtained by three-dimensional scanning, and to calculate the actual concrete usage for casting the reinforced concrete base.

10. The track slab laying accuracy control device based on three-dimensional scanning according to claim 6, characterized in that: The corner point coordinate calculation module is also used to obtain the three-dimensional coordinates of the four corner points of each reinforced concrete base in combination with the three-dimensional coordinates of the entire railway bridge deck, and then obtain the corner point coordinates of the reinforced concrete base.

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