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FRP hollow grouted anchor rod with embedded steel strand

A technology of hollow grouting and steel strands, which is applied in the installation of bolts, mining equipment, earthwork drilling and mining, etc. It can solve the problems of brittle failure, low elastic modulus and high price of FRP bolts, and achieve the effect of good ductility

Inactive Publication Date: 2017-08-18
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, FRP anchors still have the problems of low elastic modulus, large deformation, high price and brittle failure.

Method used

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  • FRP hollow grouted anchor rod with embedded steel strand
  • FRP hollow grouted anchor rod with embedded steel strand

Examples

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Embodiment Construction

[0016] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0017] Such as figure 1 and figure 2 As shown, this example provides an FRP hollow grouting anchor rod embedded with steel strands. The anchor head 6 is arranged on the head of the threaded rod body 1, and the two threaded rod bodies 1 are connected through the connecting sleeve 5, and the grout stopper 4 and the backing plate 3 are fixed on the tail of the threaded rod body 1 through the nut 2.

[0018] The threaded rod body 1 is composed of fine steel strands 11, an FRP layer 12 and sand 13 on the surface of the FRP. The nut 2, connecting sleeve 5, grout stopper 4, backing plate 3 and anchor head 6 are all made of FRP.

[0019] Feed the thin steel strands 11 soaked with epoxy resin and the fiber bundles together into a ring mold for pultrusion according to a certain ratio, the volume ratio of the fiber bundles to the e...

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Abstract

The invention discloses a FRP hollow grouting anchor rod with steel strand embedded therein. The hollow grouting anchor rod comprises a hollow threaded rod body, a nut, a backing plate, a grouting plug, a connecting sleeve and an anchor head; the threaded rod body comprises a steel strand The wire, the FRP layer and the sand on the surface of the FRP layer. Embedding thin steel strands in FRP hollow bolts can comprehensively utilize the respective advantages of FRP and steel strands, fundamentally solve the problems of easy corrosion, poor durability and high quality of steel strands in underground engineering, and improve the elasticity of FRP Mechanical properties of low modulus, large deformation and brittle failure. FRP hollow grouting bolts with the advantages of light weight, high strength, high elastic modulus, high ductility, high cost performance and excellent corrosion resistance are prepared. The surface of the FRP hollow grouting bolt is wound into a thread shape with fiber filaments and sand is glued on the surface to ensure the reliable bonding between the bolt and the concrete. The hollow grouting bolt is suitable for underground engineering support systems with high requirements on mechanical properties and corrosion resistance, and has wide application prospects.

Description

technical field [0001] The invention belongs to the research and development of composite materials and new structures in the fields of civil engineering, transportation, water conservancy, etc., and specifically relates to an FRP hollow grouting anchor rod embedded with steel strands for underground engineering support systems, which is characterized by light weight, High strength, high elastic modulus, high ductility and excellent corrosion resistance. Background technique [0002] Hollow grouting anchor is one of the commonly used support forms in underground engineering, which has the advantages of high elastic modulus and good ductility. Hollow grouting anchors are often used as a part of permanent support for underground engineering, which requires the anchor to have good durability. Due to the enrichment of groundwater and the harsh environment in underground engineering, the hollow grouting bolt has the problems of easy corrosion and poor durability. [0003] Fiber...

Claims

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Application Information

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IPC IPC(8): E21D21/00B29C70/52
CPCE21D21/0026B29C70/52E21D21/0006E21D21/0013
Inventor 李鹏飞马国伟李之建
Owner BEIJING UNIV OF TECH
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