Pre-stress tensioning clamp of hollow self-balance pre-stress steel bar

Abstract

The invention discloses a hollow self-balance pre-stress device, comprising a hollow rod, an end pipe hole plugging head, an internal support counter force rod, a wedge-shaped clamping sheet and a locking sleeve nut, wherein the locking sleeve nut is fixed at the head part of the hollow rod and the end pipe hole plugging head is fixed at the tail part of the hollow rod; one end of the locking sleeve nut is matched with the hollow rod and the other end of the locking sleeve nut is provided with an inner cavity with a wedge-shaped tapered surface; one section of the internal support counter force rod is a rod body which is matched with the inner cavity of the hollow rod and vertically passes through the inner cavity of the hollow rod; the tail end of the internal support counter force rod is supported on the end pipe hole plugging head and the other end of the internal support counter force rod passes through the locking sleeve nut and the wedge-shaped clamping sheet; a wedged surface of the wedge-shaped clamping sheet is matched with the wedge-shaped tapered surface inside the locking sleeve nut; and a tip head of the wedged surface faces a direction which departs from the end pipe hole plugging head of the hollow rod. The device disclosed by the invention is provided with a special pre-stress tensioning clamp and can store pre-stress after the pre-stress tensioning and locking are finished; and the device can be moved and mounted in another place. The device disclosed by the invention expands a pre-stress application range, has reliable effects and meets different engineering requirements.

Description

technical field [0001] The invention relates to a prestressed steel rod device and a prestressed tensioning fixture, in particular to a prestressed tensioning fixture with a hollow self-balancing prestressed steel rod and a prestressed tensioning fixture specially used for tensioning the prestressed steel rod, which is used in civil engineering Reinforcement of concrete structures in building structures, geotechnical anchoring in rock and soil strata, etc. Background technique [0002] The prestressing technology has a history of more than 50 years, and it is a technology that appeared after the development of reinforced concrete, especially reinforced concrete technology. Ordinary reinforced concrete structures mainly use the high tensile strength of steel bars to make up for the lack of concrete tensile capacity, improve the overall tensile, bending, shearing, and compressive capabilities of concrete structures, and make beams, slabs, etc. of concrete structures have large...

AI Technical Summary

Problems solved by technology

For example, large-scale beam structures require longitudinal prestressing in the span direction, as well as horizontal and vertical prestressing. Some parts of the beam height of about 4m or below also require prestressing, but on-site prestressing conditions are limited; old structures require prestressing. However, it is difficult to apply prestress on site, etc.

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