The day before, in the domestic first Long-span Railway suspension bridge - Li (Jiang) (LA) incense railway Jinsha River bridge construction, in the face of complex geological conditions, sunward SWDM45 rotary drill heavy responsibilities, taking the construction of excellent performance to win the praise of construction.
It is understood that the anchor pile construction involves a large number of large section and large depth in the process of Jinsha River bridge construction in the mountainous area, and the geology is complex, difficult construction, high safety risk, no ready-made experience for reference, the anchor pile hole construction difficulty and safety risk is particularly prominent, the difficulty and the key point of the whole anchor pile construction.
In view of this difficult problem, the construction party unceasingly carries on the craft exploration and the innovation. The first of the artificial excavation excavation scheme, but the progress is too slow, the workers in the hole operations for a long time, security risks, so the plan was soon abandoned; after combining artificial digging, in order to reduce security risks and accelerate the construction progress, decided to adopt the rotary drilling mechanical excavation, and strive to time into the hole. But the study found that the verticality of pile holes can not be guaranteed, consuming the same long, so it was abandoned; finally, the construction side of the rotary drilling pile test based on the summary of experience in Sunward Intelligent service team's suggestion, the porous drilling, blasting, excavation section of local repair hole construction technology.
The anchor pile is 4.1 meters *5.1 meters square cross-section, 65-73 meters deep, 60 MPa full rock layer construction, and the square aperture is very difficult, must have a new set of construction technology. Sunward Intelligent service team after repeated investigation, test period, to complete a pile with only one month of sunward SWDM45 rotary drilling rig, and a construction of a well-known domestic brands of large rotary drilling had to take 3 months to be completed, only. Therefore, after careful selection and rigorous assessment, the construction side finally chose the sunward SWDM45 rotary drilling drill to take on the task of excavation and drilling.
To put the line, fixed ground leveling pile construction, locking, rotary drilling, rotary drilling rig in place to dig under section excavation to the design of pile bottom hole, hole size, depth, slope, bearing layer to conduct a comprehensive inspection to exclude the hole bottom water, and installing a tube hoisting reinforcing cage and pouring pile concrete, anchor pile testing, anchor construction, through a series of complex drilling construction technology. The intelligent SWDM45 rotary drilling machine has completed the task satisfactorily and has proved that this method is feasible. Next, the construction process will be fully extended to the remaining anchor pile construction.
It is worth mentioning that this is not the first time SWDM45 in the arduous task of construction of "turn the tide". Just a few months ago in Sanmenxia, the Yellow River in the construction process, in the face of the complicated geological conditions, the main pile construction for SWDM45 rotary digging, eventually produce a maximum depth of 118 meters "excellent transcripts, with excellent performance for their reputation for sunward.