High-speed railway control network and measuring and setting method thereof

Abstract

The invention relates to the technical field of railway surveying and mapping, in particular to a high-speed railway control network and a surveying and setting method thereof, and the high-speed railway control network comprises a CPI control network, a CPII control network and a CPIII control network; the method comprises the following steps: arranging a CPI control network; on-line and off-line simultaneous measurement is carried out on the CPI control network, and coordinates of the on-line CPI control points are calibrated through multi-period calculation; a CPII control network is arranged; a CPIII control net is arranged, when the CPIII control points are arranged on the two sides of a track of a bridge beam face, the horizontal distance between every two adjacent CPIII control points is 55-65 m, and coordinates of the CPIII control points are calculated according to point position attributes of the control points, the design temperature of a beam section, the actually-measured temperature of the beam section, the pier height and the concrete expansion coefficient of the beam section. Through the setting, the influence of the temperature change on the measurement result of the CPIII control point coordinate is reduced, and the measurement precision of the CPIII control network is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of railway surveying and mapping, and in particular to a high-speed railway control network and a surveying and setting method thereof. Background Art

[0002] At present, the "Railway Engineering Surveying Specification" (TB10101-2018) is applicable to the CPIII control network survey and design of railways with a design speed of 200km / h and below, and the "High-speed Railway Engineering Surveying Specification" (TB10601-2009) is applicable to the CPIII control network survey and design of high-speed railways with a design speed of 250-350km / h. There are relatively few specifications related to railways with a design speed of 400km / h and above. The CPIII control network survey and design scheme specified in the existing relevant specifications is applied to railways with a design speed of more than 400km / h, especially bridge sections of railways with a design speed of 400km / h and above. Since the size of the bridge beam section will change due to thermal expansion and contraction, when the CPIII control points are set on the bridge beam surface, the change in the size of the bridge beam section will cause the relative position between the CPIII control points to change, thereby causing the measurement accuracy of the CPIII control network to decrease. For railways with a design speed of 400km / h and above, the accuracy error caused by this reason will have a greater impact on railway operations. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art that the size of the bridge beam section will change due to thermal expansion and contraction. When the CPIII control points are set on the bridge beam surface, the change in the size of the bridge beam section will cause the relative position between the CPIII control points to change, thereby causing the measurement accuracy of the CPIII control network to decrease, and provide a high-speed railway control network and a measurement and setting method thereof.

[0004] In a first aspect, the present invention provides a high-speed railway control network, including a CPI control network, a CPII control network, and a CPIII control network;

[0005] The CPI control network includes a number of online CPI control points and offline CPI control points, and the horizontal distance between two adjacent online CPI control points is 1.5km-2.5km;

[0006] The CPII control network includes a plurality of CPII control points on the line, and the horizontal distance between two adjacent CPII control points on the line is 500m-800m;

[0007] The CPIII control network includes a number of CPIII control points, and the horizontal distance between two adjacent CPIII control points is 55m-65m. When the CPIII control points are set on both sides of the track of the bridge beam surface, the coordinates of the CPIII control points are set according to the point attributes of the CPIII control points, the design temperature of the beam section, the measured temperature of the beam section, the pier height, and the concrete expansion coefficient of the beam section; the coordinate setting method of the CPIII control points is:

[0008] Conduct free station measurement and record the air temperature at each free station and the distance between each free station and the fixed end of the beam section;

[0009] The coordinates of each freely set station at the measured temperature are x in the line direction and y perpendicular to the line direction, and the coordinates of each freely set station at the measured temperature are calculated based on the observation data of each freely set station;

[0010] Calculate the plane coordinates of each freely set point at the design temperature of the beam section according to the concrete expansion coefficient;

[0011] According to the plane coordinates of each freely set point at the design temperature of the beam section, the angle and distance between each freely set point and each CPIII control point and the CPII control point on the line at the design temperature are calculated by the inverse calculation method;

[0012] According to the angle and distance between each freely set station and each CPIII control point and the CPII control point on the line at the design temperature, the plane coordinates of each CPIII control point are calculated;

[0013] The design elevation of the CPIII control point is calculated based on the elevation of the CPIII control point at the design temperature and the elevation of the CPIII control point at the measured temperature, and the coordinates of the CPIII control point are obtained.

[0014] Preferably, the point attributes of the CPIII control point include the CPIII control point being located at the movable end or the transverse movable end or the fixed end or the transverse fixed end of the beam section, the spacing between two CPIII control points relatively arranged on both sides of the line, and the spacing between two adjacent CPIII control points on the same side of the line.

[0015] The online CPI control points and the online and offline CPII control points refer to the control points set up for the convenience of operation, and the offline CPI control points refer to the control points set up for survey.

[0016] Through this setting, when the temperature changes, the distance between two adjacent CPIII control points located at the movable end and the fixed end of the beam segment will change due to the thermal expansion and contraction of the beam segment. By setting the coordinates of the CPIII control points according to the point attributes of the CPIII control points, the design temperature of the beam segment, the measured temperature of the beam segment, the pier height, and the concrete expansion coefficient of the beam segment, the temperature can be made to correspond to the coordinates of the CPIII control points at that temperature, thereby reducing the influence of temperature changes on the measurement results of the CPIII control point coordinates, thereby improving the measurement accuracy of the CPIII control network.

[0017] In a second aspect, the present invention provides a method for surveying and setting up a high-speed railway control network, which is used to survey and set up the high-speed railway control network, comprising the following steps:

[0018] S1: Lay out CPI control network;

[0019] S2: Conducting online and offline joint testing on the CPI control network, and calibrating the coordinates of the online CPI control points through multi-period calculation;

[0020] S3: Laying out the CPII control network, wherein the online CPII control points are arranged in such a manner that 2-3 online CPII control points are arranged between two adjacent online CPI control points, and the two adjacent online CPII control points can have a line of sight with each other, and the online CPI control point can have a line of sight with the adjacent online CPII control point;

[0021] S4: Lay out the CPIII control network.

[0022] The online and offline joint testing of the CPI control network refers to the joint testing of online CPI control points and offline CPI control points.

[0023] The step S2 comprises:

[0024] S21: The CPI control network is measured online and offline, the coordinates of the CPI control point on the ith line are calculated by adjustment, and the CPI control point on the ith line is projected onto the line to obtain the projection coordinates (xi, yi);

[0025] S22: After an interval of n, the CPI control network is tested online and offline again, and the coordinates of the i-th online CPI control point and the coordinates (x′i, y′i) of the projection of the i-th online CPI control point on the line are calculated;

[0026] S23: The preset distance error threshold is a. When the difference between y′i and yi is greater than or equal to a, adjust the coordinates of the CPI control point on the i-th line, and repeat steps S21 and S22 until the difference between y′i and yi is less than a, and obtain the coordinates of the CPI control point on the i-th line, where i represents the number of CPI control points on the line.

[0027] The time n is set to 3 days-7 days, and the distance error threshold a is set to 10 mm-20 mm.

[0028] The step S3 comprises:

[0029] S31: Lay out online CPII control points, use GNSS to conduct online joint measurement of CPI control network and CPII control network, and use total station to conduct round-trip observation of two adjacent online CPII control points and two adjacent online CPI control points and online CPII control points;

[0030] S32: The data obtained through GNSS joint measurement is jointly adjusted with the data observed through the total station to complete the layout of the CPII control network.

[0031] The step S4 comprises:

[0032] S41: Conduct free measuring stations and record the temperature when each free measuring station is set and the distance between each free measuring station and the fixed end of the beam section;

[0033] S42: The coordinates of each freely set station at the measured temperature are calculated with the line direction as x and the direction perpendicular to the line as y. The coordinates (x) of the mth freely set station at the measured temperature are calculated based on the observation data of each freely set station. m ,y m ),

[0034] Where m represents the number of free sites;

[0035] S43: Calculate the plane coordinates (x′) of each freely set point at the design temperature of the beam segment according to the concrete expansion coefficient. m , y′ m );

[0036] The calculation formula is: y′ m =y m +K*Dy*(C 设计 -C 实测 ); x′ m =x m +K*Dx*(C 设计 -C 实测 );

[0037] Where: K is the expansion coefficient of the concrete of the beam segment; Dy is the distance from the CPIII control point to the fixed end of the beam segment along the y-axis direction; Dx is the distance from the CPIII control point to the fixed end of the beam segment along the x-axis direction; C 设计 is the design temperature of the beam segment; C 实测 is the measured temperature of the beam section;

[0038] S44: According to the plane coordinates (x′) of each freely set point at the design temperature of the beam segment m , y′ m ), using the inverse calculation method to calculate the angle and distance between each free station and each CPIII control point and the CPII control point on the line at the design temperature;

[0039] S45: Adjustment calculation of the plane coordinates of each freely set station at the design temperature of the beam segment;

[0040] S46: Calculate the design elevation of the CPIII control point based on the elevation at the design temperature of the CPIII control point and the elevation at the measured temperature of the CPIII control point; the calculation formula is: H 设 =H+K*S*(C 设计 -C 实测 ), get the coordinates of the CPIII control points;

[0041] Where: H 设 is the elevation of the CPIII control point at the design temperature, H is the elevation of the CPIII control point at the measured temperature; K is the expansion coefficient of the beam concrete; S is the distance from the ground to the CPIII control point; C 设计 is the design temperature of the beam segment; C 实测 is the actual measured temperature of the beam section.

[0042] The method for measuring and setting up the high-speed railway control network also includes steps S5 and S6:

[0043] S5: Use the total station to re-measure the online CPI control points and online CPII control points;

[0044] S6: Set the angle error threshold to b. When the absolute value of the difference between the remeasured angle and the network construction angle is greater than or equal to b, adjust the position of the online CPI control point or the online CPII control point, and repeat step S41 until the remeasured angle is less than b.

[0045] The angle error threshold b is set to 2″-4″.

[0046] Through this method, the CPI control network and the CPII control network are all moved online. There is no need to re-measure the offline CPI control network during the line operation period, which greatly reduces the re-measurement workload. Since the operating line contact network, sound barriers, etc. will block and affect the GNSS signal, thereby affecting the measurement accuracy, during the re-measurement, only the total station measurement is required, which is not affected by the obstruction of sound barriers, etc., and can quickly measure and judge the point stability, and improve the re-measurement error of the CPI control network from 20mm to 15mm in the horizontal direction of the line. The CPII control network is re-measured by the method of joint measurement of GNSS and total station, and the re-measurement accuracy is improved from 15mm in the horizontal direction of the line to 12mm in the horizontal direction of the line, laying a foundation for improving the smoothness of the line.

[0047] Through this method, the influence of temperature on the layout accuracy of the high-speed railway control network is reduced, and the control accuracy of the high-speed railway control network is improved.

[0048] In a third aspect, the present invention provides a high-speed railway control network surveying and setting system, which adopts the high-speed railway control network surveying and setting method, including a CPI control point layout calibration module, a CPII control point layout calibration module and a CPIII control point layout calibration module.

[0049] The CPI control network deployment module is used to deploy the CPI control network;

[0050] The CPII control network deployment module is used to deploy the CPII control network;

[0051] The CPIII control network layout module is used to layout the CPIII control network.

[0052] Through this setting, the efficiency of high-speed railway control network surveying and setting up is improved, and the convenience of high-speed railway control network surveying and setting up is improved.

[0053] Compared with the prior art, the present invention has the following beneficial effects:

[0054] 1. The present invention provides a high-speed railway control network. By setting the control network, when the temperature changes, the distance between two adjacent CPIII control points located at the movable end and the fixed end of the beam section will change due to the thermal expansion and contraction of the beam section. By setting the coordinates of the CPIII control points according to the point attributes of the CPIII control points, the design temperature of the beam section, the measured temperature of the beam section, the pier height, and the concrete expansion coefficient of the beam section, the temperature can be made to correspond to the coordinates of the CPIII control points at the temperature, thereby reducing the influence of the temperature change on the measurement results of the coordinates of the CPIII control points, solving the multi-value problem of the CPIII control network measurement at different temperatures in the past, and thus improving the measurement accuracy of the CPIII control network; by encrypting the setting of CPI control points, the lateral accuracy of the line of the CPI control network can be improved, and the re-measurement accuracy of the CPI control network can be improved from ±20mm to ±15mm; by using GNSS and total station joint measurement, the characteristics of GNSS being able to improve measurement accuracy and total station being able to improve measurement smoothness are utilized, and the lateral accuracy of the CPII control network can be improved, and the re-measurement accuracy can be improved from coordinates ±15mm to ±12mm;

[0055] 2. The present invention provides a method for surveying and setting up a high-speed railway control network, which is used to survey and set up the high-speed railway control network. Through this method, the influence of temperature on the layout accuracy of the high-speed railway control network is reduced, and the control accuracy of the high-speed railway control network is improved.

[0056] 3. The present invention provides a high-speed railway control network surveying and setting system, which adopts the high-speed railway control network surveying and setting method. Through this setting, the efficiency of high-speed railway control network surveying and setting is improved, and the convenience of high-speed railway control network surveying and setting is improved.

[0057] 4. The present invention provides a high-speed railway control network, which encrypts the CPI control points for the first time, laying a foundation for simplifying the subsequent re-measurement of the CPI control network. There is no need to re-measure the offline CPI control network during the operation period, thus reducing the workload of re-measurement of the CPI control network. The GNSS signal is affected by the obstruction of the operating line contact network, sound barriers, etc., thereby affecting the measurement accuracy and even eliminating the observation conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1 This is a schematic diagram of the CPIII control points of Example 1 provided by the present invention being set on the point attributes of the bridge beam surface.

[0059] Figure 2 This is a schematic diagram of the layout of the online CPI control network of Example 2 provided by the present invention.

[0060] Figure 3 This is a schematic diagram of the layout of the online CPII control network of Example 2 provided by the present invention.

[0061] Figure 4 This is a schematic diagram of retesting the CPII control network according to Embodiment 2 provided by the present invention. DETAILED DESCRIPTION

[0062] The present invention is further described in detail below in conjunction with specific embodiments. However, this should not be understood as the scope of the above subject matter of the present invention being limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0063] Unless otherwise specified, in the description of the specific embodiments of the present invention, the terms indicating the orientation or position relationship such as "up", "down", "left", "right", "center", "inside", "outside", etc. are all expressions based on the orientation or position relationship shown in the drawings, or are the orientation or position relationship when the invented product / equipment / device is usually used. These terms of orientation or position relationship are only for the convenience of describing the scheme of the present invention or simplifying the description in the specific embodiments, so as to facilitate the technicians to quickly understand the scheme, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific position relationship, and therefore cannot be understood as a limitation on the present invention.

[0064] In addition, if the terms "horizontal", "vertical", "overhanging", "parallel" and the like appear, it does not mean that the corresponding devices / components / elements are required to be absolutely horizontal or vertical or overhanging or parallel, but may be slightly tilted or have deviations. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but may be slightly tilted. Alternatively, it can be simplified to mean that the corresponding devices / components / elements are set in directions such as "horizontal", "vertical", "overhanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably an error / deviation within ±8%, more preferably an error / deviation within ±6%, more preferably an error / deviation within ±5%, and more preferably an error / deviation within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its role in the scheme of the present invention.

[0065] In addition, the expressions “first”, “second”, “third”, etc., which appear in the terms, are merely used to distinguish the description of the same or similar components and should not be understood as emphasizing or implying the relative importance of specific components.

[0066] In addition, in the description of the embodiments of the present invention, "several", "plurality" and "a number" represent at least 2. It can be any number such as 2, 3, 4, 5, 6, 7, 8, 9, and even more than 9.

[0067] In addition, in the description of the technical solution of the present invention, unless otherwise clearly specified / defined / restricted, the terms "set", "install", "connect", "connected", "provided with", "laid", and "arranged" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, and can be welding, riveting, bolting, threading, and other commonly used connection means in the field. This connection can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the internal connection of two elements.

[0068] Example 1

[0069] like Figure 1 As shown, this embodiment provides a high-speed railway control network, including a CPI control network, a CPII control network and a CPIII control network; the CPI control network includes a plurality of online CPI control points and offline CPI control points, and the horizontal distance between two adjacent online CPI control points is 1.5km-2.5km; the CPII control network includes a plurality of online CPII control points, and the horizontal distance between two adjacent online CPII control points is 500m-800m; the CPIII control network includes a plurality of CPIII control points, and the horizontal distance between two adjacent CPIII control points is 55m-65m. When the CPIII control points are set on both sides of the track of the bridge beam surface, the coordinates of the CPIII control points are set according to the point attributes of the CPIII control points, the design temperature of the beam section, the measured temperature of the beam section, the pier height, and the concrete expansion coefficient of the beam section;

[0070] The coordinate setting method of the CPIII control point is:

[0071] Conduct free station measurement and record the air temperature at each free station and the distance between each free station and the fixed end of the beam section;

[0072] The coordinates of each freely set station at the measured temperature are x in the line direction and y perpendicular to the line direction, and the coordinates of each freely set station at the measured temperature are calculated based on the observation data of each freely set station;

[0073] Calculate the plane coordinates of each freely set point at the design temperature of the beam section according to the concrete expansion coefficient;

[0074] According to the plane coordinates of each freely set point at the design temperature of the beam section, the angle and distance between each freely set point and each CPIII control point and the CPII control point on the line at the design temperature are calculated by the inverse calculation method;

[0075] According to the angle and distance between each freely set station and each CPIII control point and the CPII control point on the line at the design temperature, the plane coordinates of each CPIII control point are calculated;

[0076] The design elevation of the CPIII control point is calculated based on the elevation of the CPIII control point at the design temperature and the elevation of the CPIII control point at the measured temperature, and the coordinates of the CPIII control point are obtained.

[0077] Preferably, the point attributes of the CPIII control point include the CPIII control point being located at the movable end or the transverse movable end or the fixed end or the transverse fixed end of the beam section, the spacing between two CPIII control points relatively arranged on both sides of the line, and the spacing between two adjacent CPIII control points on the same side of the line.

[0078] The online CPI control points and the online and offline CPII control points refer to the control points set up for the convenience of operation, and the offline CPI control points refer to the control points set up for survey.

[0079] Through this setting, when the temperature changes, the distance between two adjacent CPIII control points located at the movable end and the fixed end of the beam segment will change due to the thermal expansion and contraction of the beam segment. By setting the coordinates of the CPIII control points according to the point attributes of the CPIII control points, the design temperature of the beam segment, the measured temperature of the beam segment, the pier height, and the concrete expansion coefficient of the beam segment, the temperature can be made to correspond to the coordinates of the CPIII control points at that temperature, thereby reducing the influence of temperature changes on the measurement results of the CPIII control point coordinates, thereby improving the measurement accuracy of the CPIII control network.

[0080] Example 2

[0081] like Figure 2-4 As shown, this embodiment provides a method for measuring and setting a high-speed railway control network, which is used to measure and set a high-speed railway control network, including the following steps:

[0082] S1: Lay out CPI control network;

[0083] S2: Conducting online and offline joint testing on the CPI control network, and calibrating the coordinates of the online CPI control points through multi-period calculation;

[0084] S3: Laying out the CPII control network, wherein the online CPII control points are arranged in such a manner that 2-3 online CPII control points are arranged between two adjacent online CPI control points, and the two adjacent online CPII control points can have a line of sight with each other, and the online CPI control point can have a line of sight with the adjacent online CPII control point;

[0085] S4: Lay out CPIII control network;

[0086] The online and offline joint testing of the CPI control network refers to the joint testing of online CPI control points and offline CPI control points.

[0087] The step S2 comprises:

[0088] S21: The CPI control network is measured online and offline, the coordinates of the CPI control point on the ith line are calculated by adjustment, and the CPI control point on the ith line is projected onto the line to obtain the projection coordinates (xi, yi);

[0089] S22: After an interval of n, the CPI control network is tested online and offline again, and the coordinates of the i-th online CPI control point and the coordinates (x′i, y′i) of the projection of the i-th online CPI control point on the line are calculated;

[0090] S23: The preset distance error threshold is a. When the difference between y′i and yi is greater than or equal to a, adjust the coordinates of the CPI control point on the i-th line, and repeat steps S21 and S22 until the difference between y′i and yi is less than a, and obtain the coordinates of the CPI control point on the i-th line, where i represents the number of CPI control points on the line.

[0091] The time n is set to 4 days, and the distance error threshold a is set to 15 mm.

[0092] The step S3 comprises:

[0093] S31: Lay out online CPII control points, use GNSS to conduct online joint measurement of CPI control network and CPII control network, and use total station to conduct round-trip observation of two adjacent online CPII control points and two adjacent online CPI control points and online CPII control points;

[0094] S32: The data obtained through GNSS joint measurement is jointly adjusted with the data observed through the total station to complete the layout of the CPII control network.

[0095] The step S4 comprises:

[0096] S41: Conduct free measuring stations and record the temperature when each free measuring station is set and the distance between each free measuring station and the fixed end of the beam section;

[0097] S42: The coordinates of each freely set station at the measured temperature are calculated with the line direction as x and the direction perpendicular to the line as y, and the coordinates (x) of the mth freely set station at the measured temperature are calculated based on the observation data of each freely set station. m ,y m ), where m represents the number of free sites;

[0098] S43: Calculate the plane coordinates (x′) of each freely set point at the design temperature of the beam segment according to the concrete expansion coefficient. m , y′ m);

[0099] The calculation formula is: y′ m =y m +K*Dy*(C 设计 -C 实测 ); x′ m =x m +K*Dx*(C 设计 -C 实测 );

[0100] Where: K is the expansion coefficient of the concrete of the beam segment; Dy is the distance from the CPIII control point to the fixed end of the beam segment along the y-axis direction; Dx is the distance from the CPIII control point to the fixed end of the beam segment along the x-axis direction; C 设计 is the design temperature of the beam segment; C 实测 is the measured temperature of the beam section;

[0101] S44: According to the plane coordinates (x′) of each freely set point at the design temperature of the beam segment m , y′ m ), using the inverse calculation method to calculate the angle and distance between each free station and each CPIII control point and the CPII control point on the line at the design temperature;

[0102] S45: Adjustment calculation of the plane coordinates of each freely set station at the design temperature of the beam segment;

[0103] S46: Calculate the design elevation of the CPIII control point based on the elevation at the design temperature of the CPIII control point and the elevation at the measured temperature of the CPIII control point; the calculation formula is: H 设 =H+K*S*(C 设计 -C 实测 ), get the coordinates of the CPIII control points;

[0104] Where: H 设 is the elevation of the CPIII control point at the design temperature, H is the elevation of the CPIII control point at the measured temperature; K is the expansion coefficient of the beam concrete; S is the distance from the ground to the CPIII control point; C 设计 is the design temperature of the beam segment; C 实测 is the actual measured temperature of the beam section.

[0105] The method for measuring and setting up the high-speed railway control network also includes steps S5 and S6:

[0106] S5: Use the total station to re-measure the online CPI control points and online CPII control points;

[0107] S6: Set the angle error threshold to b. When the absolute value of the difference between the remeasured angle and the network construction angle is greater than or equal to b, adjust the position of the online CPI control point or the online CPII control point, and repeat step S41 until the remeasured angle is less than b.

[0108] The angle error threshold b is set to 3″.

[0109] Through this method, the CPI control network and the CPII control network are all moved online. There is no need to re-measure the offline CPI control network during the line operation period, which greatly reduces the re-measurement workload. Since the operating line contact network, sound barriers, etc. will block and affect the GNSS signal, thereby affecting the measurement accuracy, during the re-measurement, only the total station measurement is required, which is not affected by the obstruction of sound barriers, etc., and can quickly measure and judge the point stability, and improve the re-measurement error of the CPI control network from 20mm to 15mm in the horizontal direction of the line. The CPII control network is re-measured by the method of joint measurement of GNSS and total station, and the re-measurement accuracy is improved from 15mm in the horizontal direction of the line to 12mm in the horizontal direction of the line, laying a foundation for improving the smoothness of the line.

[0110] Through this method, the influence of temperature on the layout accuracy of the high-speed railway control network is reduced, and the control accuracy of the high-speed railway control network is improved.

[0111] Example 3

[0112] This embodiment provides a high-speed railway control network surveying and setting system, which adopts the high-speed railway control network surveying and setting method, including a CPI control point layout calibration module, a CPII control point layout calibration module and a CPIII control point layout calibration module.

[0113] The CPI control network deployment module is used to deploy the CPI control network;

[0114] The CPII control network deployment module is used to deploy the CPII control network;

[0115] The CPIII control network layout module is used to layout the CPIII control network.

[0116] Through this setting, the efficiency of high-speed railway control network surveying and setting up is improved, and the convenience of high-speed railway control network surveying and setting up is improved.

[0117] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-speed railway control network, characterized in that: Including CPI control network, CPII control network and CPIII control network; The CPI control network includes a number of online CPI control points and offline CPI control points, and the horizontal distance between two adjacent online CPI control points is 1.5km-2.5km; The CPII control network includes a plurality of CPII control points on the line, and the horizontal distance between two adjacent CPII control points on the line is 500m-800m; The CPIII control network includes a number of CPIII control points, and the horizontal distance between two adjacent CPIII control points is 55m-65m. When the CPIII control points are set on both sides of the track of the bridge beam surface, the coordinates of the CPIII control points are set according to the point attributes of the CPIII control points, the design temperature of the beam section, the measured temperature of the beam section, the pier height, and the concrete expansion coefficient of the beam section; the coordinate setting method of the CPIII control points is: Conduct free station measurement and record the air temperature at each free station and the distance between each free station and the fixed end of the beam section; The coordinates of each freely set station at the measured temperature are x in the line direction and y perpendicular to the line direction, and the coordinates of each freely set station at the measured temperature are calculated based on the observation data of each freely set station; Calculate the plane coordinates of each freely set point at the design temperature of the beam section according to the concrete expansion coefficient; According to the plane coordinates of each freely set point at the design temperature of the beam section, the angle and distance between each freely set point and each CPIII control point and the CPII control point on the line at the design temperature are calculated by the inverse calculation method; According to the angle and distance between each freely set station and each CPIII control point and the CPII control point on the line at the design temperature, the plane coordinates of each CPIII control point are calculated; The design elevation of the CPIII control point is calculated based on the elevation of the CPIII control point at the design temperature and the elevation of the CPIII control point at the measured temperature, and the coordinates of the CPIII control point are obtained.

2. A high-speed railway control network according to claim 1, characterized in that: The point attributes of the CPIII control point include the position of the CPIII control point on the beam section, the distance between two CPIII control points relatively arranged on both sides of the line, and the distance between two adjacent CPIII control points on the same side of the line.

3. A method for surveying and setting up a high-speed railway control network, characterized in that: The method for measuring and setting up a high-speed railway control network as claimed in claim 1 or 2 comprises the following steps: S1: Lay out CPI control network; S2: Conducting online and offline joint testing on the CPI control network, and calibrating the coordinates of the online CPI control points through multi-period calculation; S3: Laying out the CPII control network, wherein the online CPII control points are arranged in such a manner that 2-3 online CPII control points are arranged between two adjacent online CPI control points, and the two adjacent online CPII control points can have a line of sight with each other, and the online CPI control point can have a line of sight with the adjacent online CPII control point; S4: Lay out the CPIII control network.

4. A method for surveying and setting up a high-speed railway control network according to claim 3, characterized in that: The step S2 comprises: S21: The CPI control network is measured online and offline, the coordinates of the CPI control point on the ith line are calculated by adjustment, and the CPI control point on the ith line is projected onto the line to obtain the projection coordinates (xi, yi); S22: After an interval of n, the CPI control network is tested online and offline again, and the coordinates of the i-th online CPI control point and the coordinates (x′i, y′i) of the projection of the i-th online CPI control point on the line are calculated; S23: The preset distance error threshold is a. When the difference between y′i and yi is greater than or equal to a, the coordinates of the CPI control point on the i-th line are adjusted, and steps S21 and S22 are repeated until the difference between y′i and yi is less than a, and the coordinates of the CPI control point on the i-th line are obtained; Among them, i represents the number of online CPI control points.

5. A method for surveying and setting up a high-speed railway control network according to claim 4, characterized in that: The time n is set to 3 days-7 days, and the distance error threshold a is set to 10 mm-20 mm.

6. The method for surveying and setting up a high-speed railway control network according to claim 3, characterized in that: The step S3 comprises: S31: Lay out online CPII control points, use GNSS to conduct online joint measurement of CPI control network and CPII control network, and use total station to conduct round-trip observation of two adjacent online CPII control points and two adjacent online CPI control points and online CPII control points; S32: The data obtained through GNSS joint measurement is jointly adjusted with the data observed through the total station to complete the layout of the CPII control network.

7. The method for surveying and setting up a high-speed railway control network according to claim 3, characterized in that: The step S4 comprises: S41: Conduct free measuring stations and record the temperature when each free measuring station is set and the distance between each free measuring station and the fixed end of the beam section; S42: The coordinates of each freely set station at the measured temperature are calculated with the line direction as x and the direction perpendicular to the line as y, and the coordinates (x) of the mth freely set station at the measured temperature are calculated based on the observation data of each freely set station. m ,y m ), Where m represents the number of free sites; S43: Calculate the plane coordinates (x′) of each freely set point at the design temperature of the beam segment according to the concrete expansion coefficient. m , y′ m ); The calculation formula is: y′ m =y m +K*Dy*(C 设计 -C 实测 ); x′ m =x m +K*Dx*(C 设计 -C 实测 ); Where: K is the expansion coefficient of the concrete of the beam segment; Dy is the distance from the CPIII control point to the fixed end of the beam segment along the y-axis direction; Dx is the distance from the CPIII control point to the fixed end of the beam segment along the x-axis direction; C 设计 is the design temperature of the beam segment; C 实测 is the measured temperature of the beam section; S44: According to the plane coordinates (x′) of each freely set point at the design temperature of the beam segment m , y′ m ), using the inverse calculation method to calculate the angle and distance between each free station and each CPIII control point and the CPII control point on the line at the design temperature; S45: Adjustment calculation of the plane coordinates of each freely set station at the design temperature of the beam segment; S46: Calculate the design elevation of the CPIII control point based on the elevation at the design temperature of the CPIII control point and the elevation at the measured temperature of the CPIII control point; the calculation formula is: H 设 =H+K*S*(C 设计 -C 实测 ), get the coordinates of the CPIII control points; Where: H 设 is the elevation of the CPIII control point at the design temperature, H is the elevation of the CPIII control point at the measured temperature; K is the expansion coefficient of the beam concrete, S is the distance from the ground to the CPIII control point, C 设计 is the design temperature of the beam segment, C 实测 is the measured temperature of the beam section.

8. The method for surveying and setting up a high-speed railway control network according to claim 3, characterized in that: The method comprises steps S5 and S6: S5: Use the total station to re-measure the online CPI control points and online CPII control points; S6: Set the angle error threshold to b. When the absolute value of the difference between the remeasured angle and the network construction angle is greater than or equal to b, adjust the position of the online CPI control point or the online CPII control point, and repeat step S41 until the remeasured angle is less than b.

9. A method for surveying and setting up a high-speed railway control network according to claim 8, characterized in that: The angle error threshold b is set to 2″-4″.

10. A high-speed railway control network survey and design system, characterized in that: A high-speed railway control network surveying and laying method according to any one of claims 3 to 9 is adopted, comprising a CPI control network laying module, a CPII control network laying module and a CPIII control network laying module; The CPI control network deployment module is used to deploy the CPI control network; The CPII control network deployment module is used to deploy the CPII control network; The CPIII control network layout module is used to layout the CPIII control network.

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