A：
Hot melt recyclable bolt is a type of pressure-type prestressed bolt (term 2.1.1), the core of which is the use of hot melt recyclable inner anchor (term 2.1.3), which is unlocked by electric heating to achieve steel strand recovery.

Core Benefits:

1. 100% recovery rate: the anchor bar (non-bonded steel strand) can be completely extracted, and the length of the single piece residue after recovery ≤ 0.5m (clause 4.0.4);

2. Environmental protection and material saving: avoid "underground steel bar garbage", in line with the concept of green construction (clause 1.0.1);

3. Digital control: optional digital internal anchor (term 2.1.5), real-time load monitoring, accuracy up to 0.5% FS (clause 4.0.5);

4. Excellent support deformation control: pressure dispersion design (Fig. 5.1.3) reduces stress concentration, and the displacement of the foundation pit can be controlled within 25mm (case 1 data).