SW-RCD Anchor
SW-RCD Anchor System(Removable, Compressive and Distributive)
The strong points of using anchors for constructions in urban centers include effective construction management and shortening of the construction period, but this also caused serious problems, due to the difficulties in removing the tension members in later construction works or when issuing usage permits for nearby areas.
Especially, the strength per cross section of P.C. strands that are used as tension members are about six times stronger than normal steel rods, which makes it very difficult to remove the stands buried in the ground, causing much loss of excavation equipments and drilling equipments due to the anchors used at the nearby construction sites. Therefore, a removable anchor was developed to enable the removal of the P.C. strands according to the construction process after completing the excavation process, which is now being widely used.
The SW-RCD anchor system, a compressive-distributive type removable anchor that can be removed after usage, is a representative anchor product developed and commercialized by SAMWOO for the past years. SAMWOO had obtained numerous patents for this product, and since this product can be removed by man force without requiring cranes or backhoes such as the existing U-Turn anchors, it is a removable anchor system that is most efficient in various aspects, such as time, space and cost.
SW-RCD anchor system structure/specification
Removal principle of the SW-RCD anchor
When fixing the SW-RCD anchor, the removal screw ① is located at the upper groove of the wedge, and the strand is completely bound at this point.
After completing the construction and when removing the strand, the confining force is dissolved by cutting the head part of the anchor, and strand ②, wedge ③, and removal screw ① has weak confining forces.Then, by rotating strand ②, the removal screw moves to the removal net ④ inside of the upper head cap, and the wedge also moves. Therefore, the strand is freed from confinement, and removed.
SW-RCD anchor system process
SW-RCD removable anchor construction order
SW-RCD anchor system - guideline
1. Take care not to tear or damage the P.E. tube that surrounds the P.C. strand. The grout going into the tube and cured grout can be a main cause of making removal difficult.
2. Take care to prevent the anchor from being twisted when inserting. Excessive twisting can make grout curing with the P.E. tube pressing the strand, making the rotation and removal of the P.C. strand difficult.
3. When jacking the strands, precisely check the load-displacement and immediately stop jacking when an excessive displacement occurs. Excessive jacking can make the anchor body crush the grout, and the crushed grout strongly presses the tube, making the removal of the P.C. strand difficult.
4. When conducting oxygen cutting to remove the strand, leave at least 20cm, that is, a removable length. Cutting too short can make strand rotation difficult.
5. Avoid soiling the anchor body with dirt or alien substances when moving the anchor body at the site. It is difficult to secure anchoring force, not being able to apply compression to the grout.
6. Take care to prevent the destruction of the drilled hole when inserting the anchor body. It is difficult to secure anchoring force and the grout is yet not filled in.
Major achievements on SW-RCD anchor system in Korea
SW-RCD anchor system, the removable anchor system that has obtained many domestic and foreign patents, was first commercialized in 2001, and has huge achievement which reaches 3,240,000m for the past 6 years. It is the most widely used removable anchor system in Korea.
