Centering support for pressure bearing anchoring segment of pulling-pressing composite type anchor rod

Abstract

The invention relates to a centering support for a pressure bearing anchoring segment of a pulling-pressing composite type anchor rod. The centering support comprises steel positioning rings, a plurality of steel supports and plastic brackets. The steel positioning rings include a first steel positioning ring and a second steel positioning ring. The multiple steel supports are arranged outside thesteel positioning rings in a surrounding manner. Each steel support comprises a first landing leg, a first landing waist, a landing back, a second landing waist and a second landing leg, wherein thelanding back is parallel to the axes of the steel positioning rings, the first landing leg is fixed to the first positioning steel ring, and the second landing leg is fixed to the second positioning steel ring. Each plastic bracket comprises an annular cylinder arranged outside the corresponding landing back in a sleeving manner and a conical cylinder part which is arranged outside the corresponding second landing leg in a sleeving manner. The landing backs are fixedly connected with the corresponding annular cylinder parts. The centering support has the beneficial effects of being easy to manufacture, convenient to construct and capable of effectively guaranteeing centering of an anchor rod body, the anchoring effect of the anchor rod and the safety of a project.

Description

technical field [0001] The invention relates to a centering bracket used for the pressure-bearing anchoring section of a tension-compression composite anchor rod. Background technique [0002] As an efficient and economical support technology, bolt support technology has been widely used in civil engineering, water conservancy, mining, transportation, urban infrastructure and geological disaster prevention and other engineering constructions, and plays an extremely important role. The anchor rod is a key component in the anchoring project, and its construction quality will directly affect the anchoring effect of the anchor rod. In the construction process, in order to ensure that the anchor rod body is placed in the middle of the drill hole, a steel bar centering bracket is often welded on the rod body to center the rod body. The centering of the rod body can not only effectively ensure the axial transmission of force, but also make the radial force of the grouting body uni...

AI Technical Summary

Problems solved by technology

Under normal circumstances, the rod body of the tension anchorage section adopts a traditional welded steel bracket to ensure the centering of the rod body, while the rod body of the pressure anchorage section is wrapped with a PVC sleeve, so that the installation of the centering bracket will have the following two significant problems: (1) because The rod body of the pressure-bearing anchorage section of the tension-compression composite anchor must be isolated from the grouting body with a sleeve, so it is impossible to directly weld the centering support of the steel bar on the sleeve; (2) In relatively weak soil layers, the traditional Due to the small contact area between the steel bar centering bracket and the hole wall, the rod body is easy to sink into the soil due to its own weight, causing the rod body to deviate from the middle position of the drilling hole, thereby affecting the force transmission of the anchor rod and the uniformity of the force on the grouting body, thereby affecting the anchor. Rod bearing capacity

[0004] Based on the above problems, it has brought great difficulties to the centering construction of the pressure-bearing anchorage section of the tension-compression composite anchor. In the past, the traditional steel bar welding centering support could not be realized.

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