Construction method of expanded-head prestressed concrete anchor rod: Fid-Bau Portal

Construction method of expanded-head prestressed concrete anchor rod

WANG LIN / TAO GANG / WANG JUN / LIU SONGMEI

The invention discloses a construction method of an expanded-head prestressed concrete anchor rod. The anchor rod is formed by pouring and solidifying an anchor rod framework system and prestressed concrete. The construction method comprises the specific construction implementation steps of conducting drilling and positioning; drilling a hole to a designed depth, carrying out jet grouting or mechanical reaming construction to form a hole, and lowering a pull rod, namely a main rib, of the anchor rod and an expanded head framework or a fixed-diameter anchor head framework; after the pull rod, namely the main rib, of the anchor rod, an expanded head and the expanded head framework are in place, expanding the expanded head to the designed size through an expansion mechanism, and then formingthe pouring concrete on the expanded head, namely an expansion body section and a non-expansion body section until the rated strength required by design and specifications are reached; enabling the pull rod, namely the main rib, in the anchor rod to use a device and method capable of applying prestress to apply prestress to the main rib; applying the prestress required by the design and specifications, conducting locking after operation is completed, and then removing the to-be-removed equipment device for applying the prestress; and enabling a whole part of the anchor rod to be composed of the poured concrete and an anchor rod framework body.

一种扩大头预应力混凝土锚杆施工工法，由锚杆骨架体系与预应力混凝土灌注凝固而成的锚杆；其具体施工实施步骤是，钻孔定位；钻孔钻进至设计深度，开展旋喷或机械扩孔施工并成孔，下放锚杆的拉杆即主筋与扩大头骨架或固定直径锚头骨架；锚杆的拉杆即主筋与扩大头，扩大头骨架到位后，扩大机构将扩大头扩大至设计尺寸，然后灌注混凝土在扩大头即扩体段和非扩体段成型，至设计和规范要求的额定强度后；锚杆中拉杆即主筋采用能施加预应力的装置和方法对主筋施加预应力；施加设计和规范要求的预应力,完成后并锁定，再撤消需要撤除的预应力施加的设备装置；锚杆的整体部分由浇筑的混凝土与锚杆骨架体构成。

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