阅读说明：本技术 铁路斜拉桥上cpⅲ控制点的布设方法及铁路斜拉桥 (Method for laying CP III control points on railway cable-stayed bridge and railway cable-stayed bridge ) 是由 曹成度 滕焕乐 杨雪峰 刘成龙 汤建凤 闵阳 陶灿 夏艳军 于 2019-10-21 设计创作，主要内容包括：本发明提供了一种铁路斜拉桥上CPⅢ控制点的布设方法及铁路斜拉桥,其中的布设方法包括以下步骤：在斜拉桥的索塔内侧的主梁上布设CPⅢ控制点；在斜拉桥的主梁的跨中布设CPⅢ控制点；在索塔与跨中之间的主梁上相对于跨中对称间隔布设CPⅢ控制点。本发明的布设方法在铁路斜拉桥上布设CPⅢ控制点,在满足其间距规范的指标要求的基础上,能够准确反映主梁特征部位的变化量和变化规律,能够具有相对稳定性；且所布设的CPⅢ控制点易于保护并方便施工。(The invention provides a method for laying CP III control points on a railway cable-stayed bridge and the railway cable-stayed bridge, wherein the method for laying comprises the following steps: arranging CP III control points on a main beam on the inner side of a cable tower of the cable-stayed bridge; arranging CP III control points in the span of a main beam of the cable-stayed bridge; CP III control points are symmetrically distributed on the main beam between the cable tower and the midspan at intervals relative to the midspan. According to the layout method, the CP III control points are laid on the railway cable-stayed bridge, so that the variable quantity and the change rule of the characteristic part of the main beam can be accurately reflected on the basis of meeting the index requirement of the spacing specification, and the relative stability can be realized; and the distributed CP III control points are easy to protect and convenient to construct.)

1. A method for laying CP III control points on a railway cable-stayed bridge is characterized by comprising the following steps: the method specifically comprises the following steps:

laying the CP III control point on a main beam at the inner side of a cable tower of the cable-stayed bridge;

the CP III control points are distributed in the span of a main beam of the cable-stayed bridge;

and arranging the CP III control points on a main beam between the cable tower and the midspan at symmetrical intervals relative to the midspan.

2. The laying method of claim 1, wherein the CP III control point between the cable tower and the span is laid on an anti-collision wall or a ballast wall which is transversely corresponding to the connection position of the stay cable and the main beam.

3. The deployment method of claim 1 wherein the CP iii control points on the main beam between the pylon and the midspan are deployed equally.

4. The laying method of claim 1, wherein the CP III control point and the CP II control point are arranged on the main girder on the inner side of the cable tower of the cable-stayed bridge in a concurrent manner.

5. The deployment method as recited in claim 1, further comprising the steps of:

and arranging the CP III control point on the main beam corresponding to the top surface of the side span transition pier of the cable-stayed bridge.

6. The deployment method as recited in claim 1, further comprising the steps of:

and arranging the CP III control points on the simply supported beam supports outside the expansion joints at the two ends of the cable-stayed bridge.

7. The laying method according to any one of claims 1 to 6, wherein the CP III control points are arranged at the top end of an anti-collision wall or the top end of a ballast wall of the main beam.

8. The layout method as recited in any one of claims 1 to 6, wherein a distance between the CP III control points is 40m to 80 m.

9. The layout method according to any one of claims 1 to 6, wherein the CP III control points are embedded in a vertical manner.

10. A railway cable-stayed bridge is characterized in that CP III control points on the railway cable-stayed bridge are arranged by the arrangement method of any one of claims 1-9.

Technical Field

The invention relates to the technical field of railway precision measurement, in particular to a method for laying a CP III control point on a railway cable-stayed bridge and the railway cable-stayed bridge.

Background

In the process of high-speed railway construction, track control network points (namely CP III control points) need to be arranged on two sides of a track on a railway and are used as a reference for laying track slabs. When crossing over special terrains such as rivers, some railway bridges can be designed into cable-stayed bridges of long-span steel-concrete composite beams. The large-span cable-stayed bridge of the steel-concrete combined beam is generally a semi-floating body system, the main beam of the full bridge is influenced by sunlight, temperature, wind power and the like to be always changed in the transverse direction, the vertical direction and the longitudinal direction, so that the track is always changed in the plane and the elevation, wherein the deformation of the main span is obviously larger than that of the side span.

In the current relevant railway measurement specification, the traditional layout method of CP III control points on a large-span cable-stayed bridge is as follows: and laying a pair of CP III control points every 50-70 meters, burying a pair of CP III control points in a continuous beam span of 80-120 meters, burying two pairs of CP III control points in a continuous beam span of 120-180 meters, and so on. The CP III control point on the main beam of the steel-concrete composite beam cable-stayed bridge is also continuously deformed along with the change of the track, and under the traditional layout rule, the change condition and the change mode of the CP III control point can not be predicted, so that a plurality of problems are brought to the subsequent measurement and application of the track control network. Under the condition of the prior art, the conventional processing method for solving the problems is to increase the retest times of CP III control points, increase the updating frequency of CP III control point results and even use the CP III control points at any time during field measurement. However, the workload is increased, the operation is sometimes in conflict with the construction procedure, the point location changes too fast due to the influence of external environment factors, and the provided point location result is not accurate and practicable.

Disclosure of Invention

The invention aims to provide a method for laying CP III control points on a railway cable-stayed bridge and the railway cable-stayed bridge, and aims to solve the technical problem that in the prior art, the CP III control points are constantly changed to cause the change situation and the change mode of point positions to be difficult to predict.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

the invention provides a method for laying CP III control points on a railway cable-stayed bridge, which specifically comprises the following steps: laying the CP III control point on a main beam at the inner side of a cable tower of the cable-stayed bridge; the CP III control points are distributed in the span of a main beam of the cable-stayed bridge; and arranging the CP III control points on a main beam between the cable tower and the midspan at symmetrical intervals relative to the midspan.

Furthermore, the CP III control point between the cable tower and the span is arranged on an anti-collision wall or a ballast retaining wall which is transversely corresponding to the connection position of the stay cable and the main beam.

Further, the CP III control points on the main beam between the cable tower and the span are distributed in equal parts.

And furthermore, the CP III control point and the CP II control point which are arranged on the main beam on the inner side of the cable tower of the cable-stayed bridge are in the same point.

Further, the method also comprises the following steps: and arranging the CP III control point on the main beam corresponding to the top surface of the side span transition pier of the cable-stayed bridge.

Further, the method also comprises the following steps: and arranging the CP III control points on the simply supported beam supports outside the expansion joints at the two ends of the cable-stayed bridge.

And furthermore, the CP III control point is arranged at the top end of an anti-collision wall or the top end of a ballast blocking wall of the main beam.

Further, the distance between each CP III control point is 40 m-80 m.

Furthermore, the embedding mode of the CP III control point is vertical embedding.

According to another aspect of the invention, the invention also provides a railway cable-stayed bridge, and the CP III control points on the railway cable-stayed bridge are laid by the laying method.

The invention provides a method for arranging CP III control points on a railway cable-stayed bridge, which is characterized in that CP III control points are respectively arranged on the inner side of a cable tower of a main beam, in a span and between the cable tower and the span, and the CP III control points which are stable or relatively stable in some directions are arranged on the railway cable-stayed bridge by fully utilizing a stable or relatively stable structure of the railway cable-stayed bridge in some directions, so that the subsequent measurement and application of a track control network are facilitated. The layout method is arranged on CP III control points on the railway cable-stayed bridge, can accurately reflect the variation and the variation rule of the characteristic part of the main beam on the basis of meeting the index requirement of the spacing specification, and has relative stability; and the distributed CP III control points are easy to protect and convenient to construct.

Drawings

FIG. 1 is a schematic diagram of CP III control point distribution laid by the laying method according to the embodiment of the present invention;

FIG. 2 is a schematic diagram of the location of the CP III control points shown in FIG. 1 inside the pylon;

FIG. 3 is a schematic diagram of the distribution of CP III control points between the pylons and midspans as shown in FIG. 1;

FIG. 4 is a schematic diagram of the location of the CP III control points shown in FIG. 1 deployed between the pylons and midspans.

Description of reference numerals:

1. a main beam; 2. a cable tower; 3. a cable; 4. a side span transition pier; 5. spanning; 6. CP III control points; 7. crashproof wall.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

The first aspect of the embodiment of the application provides a method for laying a CP iii control point on a railway cable-stayed bridge, which specifically includes the following steps: arranging CP III control points 6 on a main beam 1 at the inner side of a cable tower 2 of the cable-stayed bridge; arranging a CP III control point 6 in a span 5 of a main beam 1 of the cable-stayed bridge; CP III control points 6 are symmetrically distributed on the main beam 1 between the cable tower 2 and the midspan 5 at intervals relative to the midspan 5.

A railway cable-stayed bridge takes a steel-concrete composite beam large-span cable-stayed bridge as an example, a main beam 1 is long and special in structure, and CP III control points 6 distributed on the main beam are large in plane coordinate and elevation variation. The railway cable-stayed bridge generally comprises a main beam 1, a cable tower 2, a stay cable 3 and a side span transition pier 4, wherein the main beam 1 is connected with the cable tower 2 through a plurality of stay cables 3. Wherein the cable tower 2 is substantially stable both horizontally and vertically at the height of the main beam 1; the mid-span 5 part has the largest transverse and vertical change, but the main beam 1 has a symmetrical structure, so the longitudinal displacement change of the mid-span 5 part is the smallest, even no change. In the above description, the lateral and longitudinal directions refer to directions of a plane coordinate system with reference to a theoretical horizontal deck of the main beam 1; vertical refers to the direction perpendicular to the horizontal deck on the main beam 1. Referring to fig. 1, CP iii control points 6 in the embodiment of the present application are all arranged in pairs. In the embodiment of the application, the CP iii control points 6 are arranged on the stable or relatively stable structure in some directions, so that the arranged CP iii control points 6 are also in a stable or relatively stable state in some directions, thereby facilitating subsequent measurement and application of the track control network.

Referring to fig. 1 and 2, a pair of symmetrical CP iii control points 6 are respectively arranged on a main beam 1 inside a cable tower 2, and since the cable tower 2 is basically stable in the horizontal and vertical directions at the height of the main beam 1, the CP iii control points 6 are also basically stable in the horizontal and vertical directions, and the longitudinal variation is within 1 mm-2 mm. In some embodiments, the CP III control point 6 and the CP II control point which are arranged on the main beam 1 at the inner side of the cable tower 2 of the cable-stayed bridge are in the same point. When the CP III control point 6 arranged on the inner side of the cable tower 2 is in the same point with the CP II control point, the CP III control point 6 can be used as the CP II control point for measuring the positions of other CP III control points 6, and the arrangement of the CP II control points is simplified. The upper part in fig. 1 is a schematic structural view of the cable-stayed bridge, and the lower part is a layout position of the CP iii control point 6 when the cable-stayed bridge is viewed from above.

The change of the mid-span 5 part in the transverse direction and the vertical direction is the largest, and the change of the longitudinal displacement is the smallest, so that the CP III control point 6 arranged on the mid-span 5 of the main beam 1 can accurately reflect the maximum displacement change of the main beam 1 in the vertical direction and the transverse direction, and the plane coordinate of the CP III control point is basically stable in the longitudinal direction. CP iii control points 6 on both sides of the bay 5 are arranged at symmetrical intervals with respect to the bay 5, see fig. 3.

The CP III control point 6 arranged on the railway cable-stayed bridge can accurately reflect the variation and the variation rule of the characteristic part of the main beam 1 on the basis of meeting the index requirement of the spacing specification, and has relative stability; and the distributed CP III control points 6 are easy to protect and convenient to construct.

In some embodiments, referring to fig. 3 and 4, the CP iii control point 6 between the cable tower 2 and the span 5 is arranged on the anti-collision wall 7 or the ballast retaining wall corresponding to the connection position of the cable 3 and the main beam 1. Specifically, except for ensuring that a pair of CP III control points 6 are arranged at the midspan 5 part, the CP III control points 6 are adjusted in distance according to the principle of 60m +/-20 m, and are ensured to be arranged on an anti-collision wall 7 or a ballast wall near the connection part of the stay cable 3 and the main beam 1, so that the change of the beam body influenced by the stay cable 3 can be directly reflected. The CP III control points 6 are arranged on the anti-collision wall 7 or the ballast blocking wall which transversely corresponds to the joint of the stay cable 3 and the main beam 1 of the railway cable-stayed bridge, on one hand, the CP III control points 6 can be guaranteed to be optimal in stability when the stay cable 3 is not adjusted, and on the other hand, the variable quantity and the variation trend of the CP III control points 6 can be subsequently calculated through the adjustment quantity of the stay cable 3 after cable adjustment.

In some embodiments, CP iii control points 6 on the main beam 1 between the pylons 5 and the pylons 2 are equally distributed. Specifically, when CP iii control points 6 between the cable tower 2 and the midspan 5 are arranged, n equal division is performed on the longitudinal length of the main beam 1 according to an adjustable principle of 60m ± 20m, wherein a pair of CP iii control points 6 are ensured to be arranged at the midspan 5 of the main beam 1, a pair of CP iii control points 6 are respectively arranged at the equal division positions, and CP iii points at two sides of the midspan 5 are symmetrically distributed at intervals relative to the midspan 5.

In some embodiments, the CP iii control point layout method further includes the steps of: and arranging CP III 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 end of the side span transition pier 4 is connected with the side span of the main beam 1. The side span transition pier 4 is positioned outside the cable tower 2. The side span transition pier 4 plays a supporting role for the side span. The deformation of the side span is not as remarkable as that of the main span, and the arrangement of the CP III control point 6 at a stable or relatively stable position on the side span is also beneficial to predicting the change situation and the change mode of the point position. The top surface of the side span transition pier 4 is stable in the vertical direction, so that the CP III control point 6 arranged on the top surface of the side span transition pier 4 is also stable in the vertical direction, and the subsequent measurement of the track control network is facilitated. Specifically, CP III control points 6 are distributed in pairs on the large and small mileage side spans on two sides of the cable tower 2 according to the longitudinal distance of about 60m, the CP III control points 6 on the side spans are distributed on the main beam 1 corresponding to the top surface of the side span transition pier 4 as far as possible, and the CP III control points 6 are stable in the vertical direction.

In some embodiments, the CP iii control point layout method further includes the steps of: and CP III control points 6 are arranged on simply supported beam supports (not shown) outside the expansion joints at the two ends of the cable-stayed bridge. The simply supported beam fixing supports with large and small mileage outside the expansion joints at the two ends of the cable-stayed bridge are basically stable in the transverse direction, the longitudinal direction and the vertical direction, so that the CP III control points 6 distributed on the simply supported beam supports are basically stable, and the subsequent measurement of a track control network is facilitated.

In some embodiments, the CP iii control points 6 are arranged on the top of the collision wall 7 or the top of the ballast wall of the main beam 1. The embedding manner of the CP iii control point 6 is vertical embedding. Referring to fig. 4, the anti-collision wall 7 is a relatively stable structure in the whole cable-stayed bridge structure, the CP iii control points 6 are arranged on the anti-collision wall 7, so that the anti-collision wall has relative stability, and the arranged CP iii control points 6 are easy to protect and convenient to construct. Specifically, when the CP III control point 6 is buried underground, mounting holes in the vertical direction can be directly dug on the top surface of the anti-collision wall 7 in pairs, the hole diameter is 30mm, the hole depth is 60mm, then the vertical base is buried underground by using marble glue, and the exposed part of the base is not higher than the top surface of the foundation pile by 2 mm. After the point location is buried and stabilized, the subsequent CP III control point 6 measurement work can be carried out, and the subsequent ballastless track laying work is guided by adopting the stabilization point result. In addition, according to the regulation, the CP III control point 6 is about 30cm higher than the track surface of the rail, so that the CP III control point is arranged at the top end of the crash wall 7, and the CP III control point 6 is vertically buried, the CP III control point 6 does not need to be buried by a stand column, and the arrangement process of the CP III control point 6 is simplified. Further, the distance between each CP III control point 6 is 40 m-80 m.

Referring to fig. 1, in a second aspect of the embodiments of the present application, there is provided a railway cable-stayed bridge, on which CP iii control points are laid by the above-mentioned laying method.

According to the embodiment of the application, the CP III control points 6 are distributed on the full bridge of the railway cable-stayed bridge, the coordinate elevation achievements of the CP III control points 6 at the top of the simply supported beam support with the large mileage and the small mileage and the CP III control points 6 at the inner side of the cable tower 2 are stable, and the longitudinal variation is within 1-2 mm. The CP III control points 6 are arranged on the main beam 1 of the railway cable-stayed bridge, the deformation of the main beam 1 caused by environmental change is mainly longitudinal and vertical deformation, the transverse deformation of the cable-stayed bridge is small, and the variable uncertainty factor of the CP III control point 6 result is reduced to the maximum extent. The CP III control point 6 is arranged at the joint of the stay cable 3 and the main beam 1 of the railway cable-stayed bridge, on one hand, the best stability of the CP III control point 6 can be ensured when the stay cable 3 is not adjusted, and on the other hand, the variable quantity and the variation trend of the CP III control point 6 can be subsequently calculated through the adjustment quantity of the stay cable 3 after cable adjustment.

The CP III control point laying method can be popularized and used on high-speed railway cable-stayed bridges under construction, and when the CP III control point 6 on the bridge floor of a large-span cable-stayed bridge structure is selected and piles are buried, the burying position and the burying mode in the method can be adopted, and the CP III control point 6 burying scheme is reasonably formulated.

The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present invention, and all such changes or substitutions are included in the scope of the present invention. Moreover, the technical solutions in the embodiments of the present invention may be combined with each other, but it is necessary to be able to be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent, and is not within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.