* The program increased the effective prestress detection of railway viaducts on August 20, 2018 (Anhui, 2011.07)
3.4.1 Effective prestress detection of railway viaducts (Anhui, 2011.07)
During the inspection of a passenger dedicated line, it was found that two holes of steel strands were retracted. At the invitation of the relevant units, we carried out an effective prestressing of the anchor head under the anchor.
Figure 3-4-15 Test object and test scenario
Table 3-4-11 Test results
|
Hole number
|
test value
（KN）
|
Remarks
|
|
XX-K7A-n1a-1-yl-1
|
823.4
|
Steel strands are not retracted to meet design requirements
|
|
XX-K7A-n1a-2-yl-1
|
494.8
|
2 steel strands are retracted, and the remaining prestress is about 60%
|
|
XX-K8A-zn1-1-yl-1
|
669.7
|
1 steel strand is retracted, and the remaining prestress is about 80% of the design value.
|