Rock and soil bolt foundation is the foundation to bear tangential force or overturning moment. Generally, the construction technology such as prestressed bolt and rotary jet mixing stiffened pile anchor can be used.
Prestressed bolt:The bolt is composed of an expanding shell anchor head, a bolt, a stop grouting plug, a backing plate and a nut. After the bolt is assembled, it is put into the anchor hole, and special prestressed tension equipment is used to exert a certain tension to the bolt. The tension of the bolt acts on the foundation through the cushion plate.
The basic principle is to rely on the lateral friction between the anchor solid and the surrounding rock to provide tension.
The construction process is as follows: The rig is in place→Into a hole→Hole cleaning→Rod body placed→grouting→Secondary grouting→Test, data collation.
According to the different anchorage methods or anchorage materials, the commonly used prestressed bolts are mechanical expansion shell prestressed bolts, resin prestressed bolts, cement prestressed bolts.
Rotary jet stirring stiffened pile:Referred to as""Stiffening pile"Is a vertical or inclined large diameter soil-cement pile formed in soft soil layer by using special machines and tools through high-pressure rotary jet grouting and mixing combined process. By laying anchor bars and anchorage elements, the prestress is applied to form reliable reinforcement piles or pulled-out piles.
The construction space of rotary jet mixing stiffened pile is not large, and it is suitable for all kinds of terrain and site. According to the characteristics of silt soil, the special anchorage parts and pile forming technology can obtain higher anchorage force.
The CONSTRUCTION OF STIFFENING PILE IN SILT, GRAVEL STRATUM AND CONFINED WATER FLOW SAND LAYER CAN solve the problems of hole formation and sandblasting water inrush, and the hole sealing construction technology of cover type complete sealing and controllable displacement is adopted.
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