Layout method of CPⅢ control points on railway cable-stayed bridge and railway cable-stayed bridge

Abstract

The present invention provides a method for laying out CPⅢ control points on a railway cable-stayed bridge and a railway cable-stayed bridge, wherein the laying out method comprises the following steps: laying out CPⅢ control points on the main beam inside the cable tower of the cable-stayed bridge; laying out CPⅢ control points at the mid-span of the main beam of the cable-stayed bridge; laying out CPⅢ control points at intervals symmetrically relative to the mid-span on the main beam between the cable tower and the mid-span. The laying out method of the present invention lays out CPⅢ control points on the railway cable-stayed bridge, and on the basis of meeting the index requirements of the spacing specification, it can accurately reflect the change amount and change law of the characteristic parts of the main beam, and can have relative stability; and the laid out CPⅢ control points are easy to protect and convenient to construct.

Description

Technical Field

[0001] The invention relates to the technical field of railway precision measurement, and in particular to a method for arranging CPⅢ control points on a railway cable-stayed bridge and the railway cable-stayed bridge. Background Art

[0002] During the construction of high-speed railways, track control points (CPⅢ control points) need to be laid on both sides of the railway track to serve as a benchmark for laying track plates. When crossing rivers and other special terrains, some railway bridges are designed as cable-stayed bridges with large spans of steel-concrete composite beams. This type of large-span cable-stayed bridge with steel-concrete composite beams is generally a semi-floating system. The main beam of the entire bridge is affected by sunlight, temperature, wind force, etc., causing it to change horizontally, vertically, and longitudinally all the time, causing the track to change in plane and elevation all the time, and the deformation of the main span is significantly greater than the deformation of the side span.

[0003] At present, in the relevant railway measurement specifications, the traditional layout method of CPⅢ control points on long-span cable-stayed bridges is: a pair of CPⅢ control points are laid out every 50 meters to 70 meters, a pair of CPⅢ control points should be buried in the middle of the continuous beam span of 80 meters to 120 meters, and two pairs of CPⅢ control points should be buried in the middle of the continuous beam span of 120 meters to 180 meters, and so on. The CPⅢ control points on the main beam of the steel-concrete composite beam cable-stayed bridge have been in constant deformation with the change of the track. Under the above traditional layout rules, the change of the position of the CPⅢ control points and the change mode cannot be predicted, which will bring many problems to the subsequent track control network measurement and its application. Under the existing technical conditions, the conventional treatment method to solve the above problems is to increase the number of re-measurements of CPⅢ control points, increase the update frequency of CPⅢ control point results, and even use them on-site as they are measured. However, this increases the workload, sometimes conflicts with the construction procedure, and due to the influence of external environmental factors, the point position changes too quickly, and the point position results provided are not accurate and feasible. Summary of the invention

[0004] The purpose of the present invention is to provide a method for arranging CPⅢ control points on a railway cable-stayed bridge and a railway cable-stayed bridge, so as to solve the technical problem in the prior art that the CPⅢ control points are constantly changing, resulting in unpredictable changes in the point positions and the manner of changes.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0006] The present invention provides a method for arranging CPⅢ control points on a railway cable-stayed bridge, which specifically comprises the following steps: arranging the CPⅢ control points on the main beam inside the cable tower of the cable-stayed bridge; arranging the CPⅢ control points at the mid-span of the main beam of the cable-stayed bridge; and arranging the CPⅢ control points at symmetrical intervals relative to the mid-span on the main beam between the cable tower and the mid-span.

[0007] Furthermore, the CPⅢ control point between the cable tower and the mid-span is arranged on a crash wall or a ballast retaining wall that corresponds laterally to the connection between the cable and the main beam.

[0008] Furthermore, the CPⅢ control points on the main beam between the cable tower and the mid-span are evenly distributed.

[0009] Furthermore, the CPⅢ control point arranged on the main beam inside the tower of the cable-stayed bridge is co-located with the CPⅡ control point.

[0010] Furthermore, the method further comprises the following steps: arranging the CPⅢ control points on the main beam corresponding to the top surface of the side span transition pier of the cable-stayed bridge.

[0011] Furthermore, the method further comprises the following steps: arranging the CPⅢ control points on the simply supported beam supports outside the expansion joints at both ends of the cable-stayed bridge.

[0012] Furthermore, the CPⅢ control point is arranged at the top of the anti-collision wall or the top of the ballast retaining wall of the main beam.

[0013] Furthermore, the distance between each of the CPⅢ control points is 40m to 80m.

[0014] Furthermore, the CPⅢ control point is buried in a vertical manner.

[0015] According to another aspect of the present invention, a railway cable-stayed bridge is further provided, wherein the CPIII control points on the railway cable-stayed bridge are laid out by the above-mentioned laying method.

[0016] The method for laying out CPⅢ control points on a railway cable-stayed bridge provided by the present invention lays out CPⅢ control points on the inner side of the cable tower of the main beam, in the middle of the span, and between the cable tower and the middle of the span, making full use of the stable or relatively stable structure of the railway cable-stayed bridge in certain directions, and laying out CPⅢ control points that are stable or relatively stable in certain directions on the railway cable-stayed bridge, so as to facilitate the subsequent measurement and application of the track control network. The CPⅢ control points laid out by the laying method of the present invention on the railway cable-stayed bridge can accurately reflect the change amount and change law of the characteristic parts of the main beam on the basis of meeting the index requirements of the spacing specification, and can have relative stability; and the laid CPⅢ control points are easy to protect and convenient for construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the distribution of CPⅢ control points arranged by the arrangement method of an embodiment of the present invention;

[0018] Figure 2 for Figure 1 The schematic diagram of the layout of the CPⅢ control points on the inner side of the tower is shown in the figure;

[0019] Figure 3 for Figure 1 The distribution diagram of CPⅢ control points between the tower and the mid-span is shown in the figure;

[0020] Figure 4 for Figure 1 The schematic diagram of the layout of CPⅢ control points between the tower and the mid-span is shown in the figure.

[0021] Description of reference numerals:

[0022] 1. Main beam; 2. Cable tower; 3. Cable; 4. Side span transition pier; 5. Mid-span; 6. CPⅢ control point; 7. Crash wall. DETAILED DESCRIPTION

[0023] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0024] In a first aspect of an embodiment of the present application, a method for arranging CPⅢ control points on a railway cable-stayed bridge is provided, which specifically includes the following steps: arranging CPⅢ control points 6 on the main beam 1 inside the cable tower 2 of the cable-stayed bridge; arranging CPⅢ control points 6 at the mid-span 5 of the main beam 1 of the cable-stayed bridge; arranging CPⅢ control points 6 on the main beam 1 between the cable tower 2 and the mid-span 5 at symmetrical intervals relative to the mid-span 5.

[0025] Railway cable-stayed bridges, taking the steel-concrete composite beam long-span cable-stayed bridge as an example, the main beam 1 has a long and special structure, and the CPⅢ control points 6 arranged on it have large changes in plane coordinates and elevation. The above-mentioned railway cable-stayed bridge is generally composed of a main beam 1, a tower 2, a cable 3 and a side span transition pier 4. The main beam 1 is connected to the tower 2 through a plurality of cables 3. Among them, the tower 2 is basically stable in the transverse and vertical directions at the height of the main beam 1; the mid-span 5 has the largest changes in the transverse and vertical directions, but because the main beam 1 is a symmetrical structure, the longitudinal displacement of the mid-span 5 is the smallest, or even does not change. In the above description, the transverse and longitudinal directions refer to the directions of the plane coordinate system with the theoretical horizontal bridge deck of the main beam 1 as a reference; the vertical direction refers to the direction perpendicular to the horizontal bridge deck on the main beam 1. Reference Figure 1 In the embodiment of the present application, the CPⅢ control points 6 are arranged in pairs. In the embodiment of the present application, the CPⅢ control points 6 are arranged on structures that are stable or relatively stable in certain directions, so that the arranged CPⅢ control points 6 are also in a stable or relatively stable state in certain directions, so as to facilitate the subsequent measurement and application of the track control network.

[0026] Reference Figure 1 , Figure 2, a pair of symmetrical CPⅢ control points 6 are arranged on the main beam 1 inside the cable tower 2. Since the cable tower 2 is basically stable in the horizontal and vertical directions at the height of the main beam 1, the above-mentioned CPⅢ control points 6 are also basically stable in the horizontal and vertical directions, and the longitudinal variation is within 1mm to 2mm. In some embodiments, the CPⅢ control points 6 arranged on the main beam 1 inside the cable tower 2 of the cable-stayed bridge are co-pointed with the CPⅡ control points. When the CPⅢ control points 6 arranged on the inside of the cable tower 2 are co-pointed with the CPⅡ control points, the CPⅢ control points 6 can be used as CPⅡ control points to measure the positions of other CPⅢ control points 6, which simplifies the arrangement of the CPⅡ control points. Figure 1 The upper part is a schematic diagram of the structure of the cable-stayed bridge, and the lower part is the layout position of the CPⅢ control point 6 when looking down at the cable-stayed bridge.

[0027] Since the mid-span 5 has the largest horizontal and vertical changes and the smallest longitudinal displacement change, arranging the CPⅢ control point 6 at the mid-span 5 of the main beam 1 can accurately reflect the maximum vertical and horizontal displacement changes of the main beam 1, while its plane coordinates are basically stable in the longitudinal direction. In addition, the CPⅢ control points 6 on both sides of the mid-span 5 are arranged symmetrically with respect to the mid-span 5. Figure 3 .

[0028] The layout method of the present invention layouts the CPⅢ control points 6 on the railway cable-stayed bridge. On the basis of meeting the index requirements of the spacing specifications, it can accurately reflect the change amount and change law of the characteristic parts of the main beam 1 and can have relative stability; and the laid CPⅢ control points 6 are easy to protect and convenient to construct.

[0029] In some embodiments, reference Figure 3 , Figure 4 , the CPⅢ control point 6 between the tower 2 and the mid-span 5 is arranged on the crash wall 7 or ballast retaining wall corresponding to the connection between the cable 3 and the main beam 1 in the transverse direction. Specifically, in addition to ensuring that there is a pair of CPⅢ control points 6 at the mid-span 5, the CPⅢ control points 6 are adjusted in distance according to the principle of 60m±20m to ensure that they are arranged on the crash wall 7 or ballast retaining wall near the connection between the cable 3 and the main beam 1, which can directly reflect the changes of the beam body affected by the cable 3. The CPⅢ control point 6 is arranged on the crash wall 7 or ballast retaining wall corresponding to the connection between the cable 3 and the main beam 1 of the railway cable-stayed bridge. On the one hand, the stability of the CPⅢ control point 6 can be guaranteed to be optimal when the cable 3 is not adjusted, and on the other hand, the change amount and change trend of the CPⅢ control point 6 can be subsequently calculated by the adjustment amount of the cable 3 after the cable is adjusted.

[0030] In some embodiments, the CPⅢ control points 6 on the main beam 1 between the cable tower 2 and the mid-span 5 are evenly distributed. Specifically, when arranging the CPⅢ control points 6 between the cable tower 2 and the mid-span 5, the longitudinal length of the main beam 1 is divided into n equal parts according to the adjustable principle of 60m±20m, wherein a pair of CPⅢ control points 6 is guaranteed to be arranged at the mid-span 5 of the main beam 1, and a pair of CPⅢ control points 6 are arranged at the equal parts, and at the same time, the CPⅢ points on both sides of the mid-span 5 are symmetrically spaced relative to the mid-span 5.

[0031] In some embodiments, the method for arranging CPⅢ control points also includes the following steps: arranging CPⅢ control points 6 on the main beam 1 corresponding to the top surface of the side span transition pier 4 of the cable-stayed bridge. The side span transition pier 4 is arranged on the side span of the main beam 1, and the top of the side span transition pier 4 is connected to the side span of the main beam 1. The side span transition pier 4 is located on the outside of the cable tower 2. The side span transition pier 4 supports the side span. The deformation of the side span is not as significant as the deformation of the main span. Arranging CPⅢ control points 6 at a stable or relatively stable position on the side span is also conducive to predicting the change of point positions and the change mode. The top surface of the side span transition pier 4 is vertically stable, so the CPⅢ control points 6 arranged on the top surface of the side span transition pier 4 are also vertically stable, which is convenient for subsequent track control network measurement. Specifically, on the side spans of different lengths on both sides of the cable tower 2, CPⅢ control points 6 are arranged in pairs at a longitudinal interval of about 60 m. The CPⅢ control points 6 on the side spans are arranged as close to the main beam 1 as possible to the top surface of the side span transition pier 4. At this time, the CPⅢ control points 6 are vertically stable.

[0032] In some embodiments, the method for arranging CPⅢ control points further includes the following steps: arranging CPⅢ control points 6 on simply supported beam supports (not shown in the figure) outside the expansion joints at both ends of the cable-stayed bridge. The simply supported beam fixed supports of large and small mileages outside the expansion joints at both ends of the cable-stayed bridge are basically stable in the horizontal, longitudinal and vertical directions, so the CPⅢ control points 6 arranged on the simply supported beam supports are also basically stable, which is convenient for subsequent track control network measurement.

[0033] In some embodiments, the CPⅢ control point 6 is arranged at the top of the anti-collision wall 7 of the main beam 1 or the top of the ballast retaining wall. The CPⅢ control point 6 is buried in a vertical manner. Figure 4The crash barrier 7 is a relatively stable structure in the entire cable-stayed bridge structure. The arrangement of the CPⅢ control point 6 on the crash barrier 7 is conducive to its relative stability, and the arranged CPⅢ control point 6 is easy to protect and convenient for construction. Specifically, when the CPⅢ control point 6 is buried, the installation holes in the vertical direction can be directly drilled in pairs on the top surface of the crash barrier 7, with a hole diameter of 30mm and a hole depth of 60mm, and then the vertical base is buried with marble glue, and the exposed part of the base is not higher than the top surface of the foundation pile by 2mm. After the point is buried and stabilized, the subsequent measurement of the CPⅢ control point 6 can be carried out, and the stable point results are used to guide the subsequent ballastless track laying work. In addition, according to regulations, the CPⅢ control point 6 should be about 30cm higher than the track surface of the rail. Therefore, the CPⅢ control point is arranged at the top of the crash barrier 7, and the CPⅢ control point 6 is buried vertically, without the need to set up additional columns to bury the CPⅢ control point 6, which simplifies the arrangement process of the CPⅢ control point 6. Furthermore, the distance between each CPⅢ control point 6 is 40m to 80m.

[0034] Reference Figure 1 According to a second aspect of an embodiment of the present application, a railway cable-stayed bridge is provided, on which the CPⅢ control points are laid out by the above-mentioned laying method.

[0035] In the embodiment of the present application, CPⅢ control points 6 are arranged on the entire railway cable-stayed bridge. The coordinate elevation results of the CPⅢ control points 6 on the top of the simply supported beams of large and small mileages and the CPⅢ control points 6 on the inner side of the cable tower 2 are relatively stable, and the longitudinal change is within 1mm to 2mm. The CPⅢ control points 6 are arranged on the main beam 1 of the railway cable-stayed bridge. Since the deformation of the main beam 1 caused by environmental changes is mainly longitudinal and vertical deformation, the lateral deformation of the cable-stayed bridge is relatively small, which minimizes the uncertainty factors of the change of the results of the CPⅢ control points 6. The CPⅢ control points 6 are arranged at the connection between the cables 3 and the main beam 1 of the railway cable-stayed bridge. On the one hand, when the cables 3 are not adjusted, the stability of the CPⅢ control points 6 can be guaranteed to be optimal. On the other hand, after the cables are adjusted, the change amount and change trend of the CPⅢ control points 6 can be subsequently calculated by the adjustment amount of the cables 3.

[0036] The CPⅢ control point layout method of the embodiment of the present application can be promoted and used on high-speed railway cable-stayed bridges under construction. When faced with the selection and burying of CPⅢ control points 6 on the bridge deck of a large-span cable-stayed bridge structure, the burying position and burying method of the present invention can be adopted to reasonably formulate a CPⅢ control point 6 burying plan.

[0037] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered within the protection scope of the present invention. In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A method for arranging CPⅢ control points on a railway cable-stayed bridge, characterized in that: The specific steps include: Arranging the CPⅢ control points on the main beam inside the cable tower of the cable-stayed bridge; Arrange the CPⅢ control point in the middle of the span of the main beam of the cable-stayed bridge; The CPⅢ control points are arranged on the main beam between the cable tower and the mid-span at intervals symmetrically with respect to the mid-span; The CPⅢ control point between the cable tower and the mid-span is arranged on the collision wall or ballast retaining wall corresponding to the connection between the cable and the main beam in the transverse direction; CPⅢ control points are arranged in pairs along the transverse direction of the main beam.

2. The laying method according to claim 1, characterized in that: The CPⅢ control points on the main beam between the cable tower and the mid-span are evenly distributed.

3. The laying method according to claim 1, characterized in that: The CPⅢ control point arranged on the main beam inside the cable tower of the cable-stayed bridge is co-located with the CPⅡ control point.

4. The laying method according to claim 1, characterized in that: The following steps are also included: The CPⅢ control points are arranged on the main beam corresponding to the top surface of the side span transition pier of the cable-stayed bridge.

5. The laying method according to claim 1, characterized in that: The following steps are also included: The CPⅢ control points are arranged on the simply supported beam supports outside the expansion joints at both ends of the cable-stayed bridge.

6. The laying method according to any one of claims 1 to 5, characterized in that: The CPⅢ control point is arranged at the top of the anti-collision wall or the top of the ballast retaining wall of the main beam.

7. The laying method according to any one of claims 1 to 5, characterized in that: The distance between each of the CPⅢ control points is 40m to 80m.

8. The laying method according to any one of claims 1 to 5, characterized in that: The burying method of the CPⅢ control point is vertical burying.

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