SDA bolt is a kind of hollow bar with continuous thread, one end connects to drill machine and another one connects to one-off drill bit. When drilling, slurry can be injected through hole of bolt, which realizes integrated construction of drilling, grouting and anchoring. After grouting, it can ensure cement mortar and cement paste wrapping overall length of SDA bolt, contacting with surrounding soil body and then forming a combination. When grouting, slurry is from bottom of hole,...

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