Hollow anchor rod

A bolt and hollow technology, which is applied in the installation of bolts, sheet pile walls, mining equipment, etc., can solve problems such as weak anchoring force, small gripping force, and small ultimate tensile force, so as to improve the bearing capacity of the bolt and simplify construction steps, the effect of less prestress loss

Inactive Publication Date: 2014-07-02
SILVERY DRAGON PRESTRESSED MATERIALS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used threaded steel anchors have small ultimate tensile force, low strength, and heavy unit weight, while steel strand anchors have small cross-sectional area, small gripping force, weak anchoring force, and require grouting pipes, and the construction steps are cumbersome

Method used

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0023] Such as Figure 1 to Figure 4 As shown, the present invention includes a rod body 1, and the rod body 1 includes a central casing 2 and nine spiral rib steel wires 3 on the periphery, and the steel wires 3 are helically wound on the periphery of the casing 2 at an angle of 7-8°. The casing 2 is provided with a grouting hole 4 . One end of the casing 2 has an annular groove 7 for fixing the slurry stopper placed in the casing 2 . During grouting, grouting can be performed from an opening at one end of the casing 2, and then overflow from the grouting hole 4, and the grout stopper can effectively prevent the grout from backflowing.

[0024] The rod body 1 also includes a number of annular locators 5 that are sleeved on the outside of the sleeve 2. The annular locators 5 are a spline structure, and the cross section of the keyway is an ar...

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PUM

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Abstract

The invention provides a hollow anchor rod which comprises a rod body. The rod body comprises a center casing pipe and a plurality of steel wires on the periphery of the casing pipe. The steel wires are winded around the periphery of the casing pipe in a spiral mode, and a slurry filling hole is formed in the casing pipe. The steel wires comprise helical rib steel wires or indented wires or round wires. The steel wires are formed by combining the round wires and the helical rib steel wires, or are formed by combining the round wires and the indented wires, or are formed by combining the round wires, the helical rib steel wires and the indented wires. The hollow anchor rod has the advantages that the bearing force of the anchor rod is enhanced by the adoption of steel tendons with high strength and low relaxation, and loss of prestress is reduced; the adhesion stress of the anchor rod and slurry is enhanced greatly due to the fact that the holding force of the helical rib steel wires or the indented wires is good, and winding combination is adopted; material is saved by the adoption of center pipe material; the hollow anchor rod is not affected by force and free of deformation when tensioned, and guarantees grouting quality without extra grouting pipes due to the support of a ring shape positioning device, and is suitable for grouting of a cement system and a synthetic resin system.

Description

technical field [0001] The invention relates to a hollow anchor rod. Background technique [0002] Anchor bolts, as a commonly used rod system structure for rock and soil reinforcement, are usually divided into rod bodies (composed of steel strands, steel wire bundles, threaded steel bars, steel pipes and other materials), tension anchors (anchor heads), grouting bodies and so on. Commonly used threaded steel anchors have small ultimate tensile force, low strength, and heavy unit weight, while steel strand anchors have small cross-sectional area, small gripping force, weak anchoring force, and require grouting pipes, and the construction steps are cumbersome. This just needs a kind of new anchor rod that can overcome the defect of above-mentioned two kinds of anchor rods, can significantly improve the strength of anchor rod, anchorage ability, and save steel material, reduce cost. Contents of the invention [0003] The purpose of the present invention is to provide a hol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D5/74E21D21/00
Inventor 谢志峰闫崇健艾铁岭谢志安张宜文
Owner SILVERY DRAGON PRESTRESSED MATERIALS CO LTD
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