Construction process for partially bonded prestressed uplift-resistant glass fiber anchor piles avoiding stress concentration

A construction process for partially bonded prestressed uplift-resistant glass fiber anchor piles avoiding stress concentration, comprising the following steps:

• step 1:
• implementing site management measures, comprising balancing site layout, balancing personnel allocation, balancing material storage, and ensuring unimpeded communication;
• step 2:
• performing surveying, layout, and determination of anchor pile locations according to design drawings, with specific steps as follows:
• drilling holes at designated anchor positions using steel bars, marking positions of the holes with lime, and inserting wooden sticks for additional identification when necessary, wherein all anchor pile locations for a building unit are laid out in a single operation and must be jointly inspected and approved by supervisory and construction parties before proceeding to subsequent operations;
• step 3:
• drilling a borehole using a spiral drilling rig, advancing to a designed depth under a condition where hole collapse does not occur in stratum, and then withdrawing the spiral drilling rig from the borehole;
• step 4:
• inspecting a diameter, a depth, a verticality of the borehole, and a thickness of loose sediment at a bottom of the borehole, and upon meeting requirements, lowering a pre-fabricated glass fiber rod cage into the borehole;
• step 5:
• injecting cement grout through a primary grouting pipe up to a designed elevation, and injecting the cement grout through a secondary grouting pipe to achieve a designed grout volume when necessary, so as to complete a construction of an anchor pile;
• wherein the cement grout is prepared as follows:
• selecting raw materials of the cement grout, repeatedly determining a mix ratio, mixing the raw materials in a mixer to obtain mixed raw materials, filtering the mixed raw materials through a fixed screen to obtain the cement grout, and pumping the cement grout using a grout pump;
• step 6:
• moving the spiral drilling rig, readjusting leveling and verticality of the spiral drilling rig, constructing a next anchor pile using the spiral drilling rig;
• and
• step 7:
• after the construction of the anchor pile is complete and the anchor pile is cured to a required age, conducting load testing, and upon passing inspection, tensioning and locking the anchor pile by tightening a nut to a designed torque value;
• wherein a locking device is selectively positioned at a top of the anchor pile with an elongation portion embedded into a base slab, or alternatively positioned at a reserved position in an upper half portion of the base slab, and after locking, a reserved cavity is filled with waterproof concrete;
• wherein under a target stress condition, a certain amount of covering soil is designed above the base slab, the locking device is placed above the base slab, and the covering soil is proceeded directly after locking.