CN-121976471-A - Method for erecting reference cable strand of main cable of continuous suspension bridge with anti-slip shear key

CN121976471ACN 121976471 ACN121976471 ACN 121976471ACN-121976471-A

Abstract

The invention relates to the technical field of main cables of suspension bridges, in particular to a method for erecting a standard cable strand of a main cable of a continuous suspension bridge with an anti-slip shear key, wherein the standard cable strand is made of full high-precision standard wires and adopts a continuous through-length type cable making mode, and the method comprises the following steps that S1, starting point marking points and end point marking points of all standard wires of the standard cable strand are aligned; S2, fixing and installing a shear key at each crossing point of the reference strand, wherein the shear key is matched with a reserved notch of a cable saddle, S3, temporarily fixing the position of a base line length mark of the reference strand, winding the reference strand by using a wrapping belt, S4, removing the temporary fixing to enable steel wires in the strand to freely slide, and erecting the reference strand by taking the average length naturally formed after the self-adaption of the length of the standard strand as the length of the reference strand after the cable strand is stressed. The erection method effectively reduces the intra-strand error, can carry out high-precision erection only by aligning the shear key with the notch on site, does not need sag adjustment, and improves the construction efficiency.

Inventors

GUO SHIJIE
HE FENG
He Qiaozhu
WANG YONG
YIN HANG
TANG MAOLIN
LIU LEILEI
CAO FAHUI
ZHENG XUFENG
TIAN BO
JIANG JIANJUN
DONG JIANGHUA
LI DINGSHI

Assignees

西南交通大学
四川省公路规划勘察设计研究院有限公司

Dates

Publication Date: 20260505
Application Date: 20260316

Claims (10)

1. The method for erecting the standard cable strand of the main cable of the continuous suspension bridge with the anti-slip shear key is characterized in that the standard cable strand is made of full high-precision standard wires and adopts a continuous through-length cable making mode, and comprises the following steps: S1, aligning starting point marking points and end point marking points of all standard wires of a standard strand; S2, fixedly mounting shear keys at each sub-span point of the reference cable strand, wherein the shear keys are matched with reserved notches of the cable saddle and are used for limiting the reference cable strand and the cable saddle to slide; s3, temporarily fixing the baseline length mark position of the reference strand, and winding the reference strand by using a wrapping belt; And S4, removing the temporary fixation to enable the steel wires in the strand to slide freely, and erecting the standard strand by taking the average length naturally formed after the standard wire length is self-adaptive as the length of the standard strand after the strand is stressed.
2. The method for erecting the reference cable strand of the continuous suspension bridge main cable with the anti-slip shear key according to claim 1, wherein the reference cable strand is made of 19-wire full-high-precision standard wires.
3. The method for erecting the standard cable strand of the continuous suspension bridge main cable with the anti-slip shear key according to claim 1, wherein the standard cable strand is made of 37-wire full-high-precision standard wires.
4. The method for erecting the main cable standard strand of the continuous suspension bridge with the anti-slip shear key according to claim 1, wherein in the step S1, the starting point marking points and the ending point marking points of all standard wires of the standard strand are aligned by adopting a drawing and wire-blowing process.
5. The method for erecting a main cable standard strand for a continuous suspension bridge with an anti-slip shear key according to claim 1, wherein in S3, temporary fixing is performed at the marked position of the standard strand every 700±10 meters of the length of the base line.
6. The method for erecting a main cable standard strand of a continuous suspension bridge with an anti-slip shear key according to claim 1, wherein in S3, a torpedo clamp is used for temporary fixation at a baseline length mark position of the standard strand.
7. The method for erecting a main cable standard strand for a continuous suspension bridge with an anti-slip shear key according to claim 1, wherein in S3, the distance between adjacent wrapping belts is 1.5±0.2 meters.
8. The method for erecting a reference cable strand for a continuous suspension bridge with anti-skid shear keys according to claim 1, wherein in S3, each wrapping tape is wrapped with no less than six layers.
9. The method for erecting the reference cable strand of the continuous suspension bridge with the anti-slip shear key according to claim 1, wherein in the step S3, each wrapping belt is wound in a manner of firstly winding two turns with a non-binding surface on the back of the wrapping belt and then turning over the wrapping belt to wind four turns.
10. The method for erecting a reference cable strand for a continuous suspension bridge with an anti-slip shear key according to claim 1, wherein in S4, the reference cable strand is erected by using a single cable slot arranged on the outer side.

Description

Method for erecting reference cable strand of main cable of continuous suspension bridge with anti-slip shear key Technical Field The invention relates to the technical field of main cables of suspension bridges, in particular to a method for erecting a reference cable strand of a main cable of a continuous suspension bridge with an anti-slip shear key. Background The main cable of the suspension bridge commonly adopts a prefabricated parallel steel wire strand (PWS) structure, and the length precision of the main cable has a decisive influence on the forming quality and the structural stress performance of the main cable. According to the technical condition of prefabricated main cable strand of suspension bridge (JT/T395-1999), the length precision of the prefabricated parallel steel wire strand of the suspension bridge is required to be more than 1/12000, and the length precision of the standard wire is required to be more than/15000. In the prior art, standard wire manufacturing usually adopts a baseline method or a magnetization length measuring method, and the length measuring precision can reach 1/100000 at most. However, in the actual stranding process, two key problems still face: First, intra-strand errors of strands are difficult to avoid. Due to the reasons of the dispersion, uneven stress distribution, uncontrollable wire-blowing process and the like of the diameter of the steel wire, even if all standard wires are qualified in precision, larger intra-strand errors still exist after the braiding of the rope strands is completed. For example, 2019 golden aromatic (Jin Fang, zhang Hailiang, gu Qinghua, et al 1960 MPa suspension bridge main cable strand length accuracy control and verification [ J ]. Metal product, 2019,45 (01): 16-25.) each placed a standard wire on six corners of the strand, and the limit deviation of six standard wire marker points was measured. In the process of braiding, the maximum relative deviation of strands with the length of 3070m at the positions marked by the standard wires is 175mm, the relative length precision is 1/17543, and the error is the intra-strand error. The length precision of the prefabricated parallel steel wire strands of the suspension bridge at home and abroad at present is mainly controlled by virtue of standard wires, the precision requirement of the standard wires is generally 1/15000, the length precision of the strands is 1/12000, but the internal error of the strands is a stress elongation value of 1.0% of the tensile strength of the steel wires, the factor has great influence on the precision of the strands, the strands are manufactured according to the prior manufacturing process, and a long anchor pull rod adjustment quantity is required to be arranged, so that the construction error and risk can be increased. Secondly, the field erection precision of the reference cable strand is difficult to ensure. At present, the standard strand is erected by the absolute sag method. The method utilizes the one-to-one correspondence between strand sag and length to measure midpoint sag to indirectly control strand length. However, sag measurement is extremely sensitive to meteorological conditions (temperature, wind speed, humidity and the like), time and labor are consumed in implementation, multi-person cooperation and night operation are usually needed, the erection period is as long as 7-30 days, and once severe weather is met, the construction progress and quality are seriously affected even if shutdown is possible. At present, a high-precision erection scheme of a reference cable strand is researched mainly based on a main cable strand marking counterpoint erection method of a split-span type high-precision marking cable strand and a multi-standard wire, and the main cable strand marking counterpoint erection method has the defects that when the split-span type cable strand is manufactured, the anchor head of the cable strand needs to be subjected to anchor filling cutting for multiple times, so that the manufacturing error of the cable strand is increased, and the cable strand at the anchoring position of a cable saddle is shaped into a rectangle by a hexagon, so that the shape of the cable strand is changed greatly, the erection precision of the reference cable strand is further reduced, and the construction difficulty is increased. The existing erection method of the reference cable strand can be seen from Chinese patent application publication numbers CN114657878B and CN110878523A, which discloses a main cable of a suspension bridge with split-span type high-precision marked cable strands and a main cable strand marked alignment erection method of the suspension bridge based on multi-standard wires. Disclosure of Invention The invention aims to overcome the defects that the standard strand erection method of the main cable of the existing suspension bridge has great influence on strand precision due to intra-strand errors and the standard strand