A method for retaining tension in a stressed tendon cast in a reinforced concrete structure includes removing concrete from the structure to expose the tendon, attaching a re-anchoring clamp to the exposed tendon, the re-anchoring clamp comprising two partial sections assembled to enclose the tendon, pouring grout around the re-anchoring clamp and allowing the grout to substantially cure.

For one sided anchoring of two casing elements the invention proposes an anchor including an anchor rod with a thread and an anchor head that is rotationally fixed at the anchor rod to drive the anchor to rotate. A first reaction bearing is arranged at a fixed distance from the anchor head, wherein an enveloping tube that is arrangeable on the anchor rod is supported at the first reaction bearing, wherein a sleeve that forms a second reaction bearing for a casing element that is remote from the anchor head is arranged at another end of the enveloping tube. The invention facilitates one sided anchoring.

According to one embodiment an anchor for a vertical formwork is provided that includes a fixed part suitable for being fixed to a formwork panel and fixing means for fixing the fixed part to the formwork panel. The fixing means includes a fixing key suitable for being housed in a hole of the formwork panel, the fixing key comprising an off-centered stop with respect to the axis of rotation of the fixing key, such that in a first angular position the off-centered stop of the fixing key can be introduced in the hole of the formwork panel and in a second angular position the off-centered stop is retained by the formwork panel, and therefore the anchor is fixed to the formwork panel.

A closed wall hold down system is provided including at least one closed wall panel, at least one first tie rod, at least one second tie rod, at least one coupler nut, and at least one ratcheting take-up device. The at least one closed wall panel includes a bottom plate and a top plate. The at least one first tie rod projects through the bottom plate. The at least one coupler nut is coupled to the at least one first tie rod and to a first end of the at least one second tie rod. A second end of the at least one second tie rod extends through the top plate. The at least one ratcheting take-up device engages the second end of the at least one second tie rod. A method of installing the closed wall hold down system is also provided.

Various implementations described herein are directed to a bracket of a formwork system. In one implementation, the bracket includes: a first member having a first plurality of openings; and a second member having a second plurality of openings. The first member and the second member are configured to: be perpendicular to each other; and provide lateral adjustment via the first plurality of openings and/or the second plurality of openings.

According to one embodiment a vertical formwork is provided that includes at least one front formwork panel and one rear formwork panel that are arranged facing one another. The vertical form work also includes a rear anchor fixed to the rear panel, a front anchor fixed to the front formwork panel, and one tie rod (6) fixed to the front anchor and to the rear anchor. The rear anchor includes a support configured to be fixed to the rear formwork panel, and a nut coupled to said support. The nut includes a threaded hole configured for housing the threaded end of a tie rod. The threaded hole of the nut includes a first segment with an internal thread with a first core diameter and a second segment with an internal thread with a second core diameter, the first core diameter being greater than the second core diameter.

According to one embodiment a vertical formwork is provided that includes at least one front formwork panel and one rear formwork panel that are arranged facing one another. The vertical form work also includes a rear anchor fixed to the rear panel, a front anchor fixed to the front formwork panel, and one tie rod (6) fixed to the front anchor and to the rear anchor. The rear anchor includes a support configured to be fixed to the rear formwork panel, and a nut coupled to said support. The nut includes a threaded hole configured for housing the threaded end of a tie rod. The threaded hole of the nut includes a first segment with an internal thread with a first core diameter and a second segment with an internal thread with a second core diameter, the first core diameter being greater than the second core diameter.

According to one embodiment an anchor for a vertical formwork is provided that includes a fixed part suitable for being fixed to a formwork panel and fixing means for fixing the fixed part to the formwork panel. The fixing means includes a fixing key suitable for being housed in a hole of the formwork panel, the fixing key comprising an off-centered stop with respect to the axis of rotation of the fixing key, such that in a first angular position the off-centered stop of the fixing key can be introduced in the hole of the formwork panel and in a second angular position the off-centered stop is retained by the formwork panel, and therefore the anchor is fixed to the formwork panel.

The disclosure relates to a formwork panel comprising: a formwork panel member having a front side for delimiting a space to be filled with concrete, a back side opposite the front side and a through-opening extending from the front side to the back side for allowing passage of a tie rod therethrough, the through-opening having a first cross-sectional area; an adjustment member extending across the through-opening of the formwork panel member, the adjustment member having a through-hole with a second cross-sectional area smaller than the first cross-sectional area of the through-opening of the formwork panel member, the through-hole being moveable relative to the front side of the formwork panel member.

Furthermore, the disclosure relates to a formwork system and a method using such formwork panel.

A concrete form includes a first sidewall and a second sidewall positioned in parallel and spaced relation to each other, where the first sidewall has a first passage extending therethrough, with a first insert received in the first passage of the first sidewall. The form also includes a first cross tie having opposed first and second ends, where the first sidewall is removably secured to the first end of the first cross tie and the second sidewall is secured to the second end of the first cross tie. A first fastener extends through the first passage and engages the first insert and the first end of the first cross tie to removably secure the first sidewall to the first cross tie. The second sidewall may be removably or non-removably secured to the first cross tie.