Tension dispersion-type complex anchor body with a removable tension member, and method for constructing same

A method for constructing a tension dispersion type complex anchor device, comprising:

• a first step of forming a complex anchor device by grasping a distal end of a tension member by a wedge assembly of an internal fixing body and threadedly coupling a fixing block of the internal fixing body and a grip sleeve squeezed against a permanent anchor to both ends of a coupler;
• a second step of fitting block spacers around couplers of at least two complex anchor devices, fitting tension members of adjacent complex anchor devices into grooves of the block spacers fitted around the couplers, and inserting the complex anchor devices into an anchor hole such that permanent anchors of the complex anchor devices are arranged in such a way as to define step-like shapes;
• a third step of filling a grout into the anchor hole and fixing the grout, applying a tension force to the tension members, and fixing the complex anchor devices to an external fixing body which is installed on a slope;
• a fourth step of cutting the tension members fixed by the external fixing body using a welding machine after anchoring construction is completed, and thereby releasing a tension force;
• a fifth step of pushing wedge assemblies grasping the tension members as a reaction force corresponding to the tension force is applied to the tension members, and thereby a wedging force of the tension members is released;
• and
• a sixth step of taking out the tension members from internal fixing bodies.

A tension dispersion type complex anchor device comprising:

• an internal fixing body having a tension member which is placed through a free length section to apply a tension force and a fixing block to which a distal end of a steel wire of the tension member is separably coupled;
• a first connection unit for coupling and decoupling the tension member to and from the fixing block of the internal fixing body;
• a permanent anchor fixed by being fitted at a distal end thereof into the other end of the fixing block of the internal fixing body to provide an allowable anchoring force through a bonded length section;
• and
• a second connection unit for coupling the permanent anchor to the fixing block of the internal fixing body.

A method for constructing a tension dispersion type complex anchor device, comprising:

• a first step of forming a complex anchor device by forming internal threads on both ends of a fixing block of an internal fixing body and by separably locking a tension member and a permanent anchor into the internal threads of the fixing block, respectively;
• a second step of fitting block spacers around internal fixing bodies of at least two complex anchor devices, and fitting tension members of adjacent complex anchor devices into grooves of the block spacers, and inserting the complex anchor devices into an anchor hole such that permanent anchors of the complex anchor devices are arranged in such a way as to define step-like shapes;
• a third step of filling a grout into the anchor hole and fixing the grout, applying a tension force to the tension members, and fixing the complex anchor devices to an external fixing body which is installed on a slope;
• a fourth step of cutting the tension members fixed by the external fixing body using a welding machine after anchoring construction is completed, and thereby releasing a tension force;
• and
• a fifth step of rotating the tension members locked to fixing blocks of the internal fixing bodies through a free length section, and thereby releasing a locking force and taking out the tension members.