# US 2014/0154017 A1 · Self-drilling friction bolt

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- Number: US 2014/0154017 A1
- Document ID: US20140154017A1
- Status: Published application
- Kind: A1
- Application number: 14/235,098
- Filed: 2012-08-22
- Published: 2014-06-05
- Earliest claimed: 2011-08-23
- Assignees: FCI Holdings Delaware, Inc.
- Inventors: Mauricio Antonio Hidalgo Salgado
- Web page: https://patentgrep.com/patent/US20140154017A1

## CPC

- E21D 21/004: {Bolts held in the borehole by friction all along their length, without additional fixing means}
- E21D 21/0053: {Anchoring-bolts in the form of lost drilling rods}
- E21D: SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS (soil-conditioning or soil-stabilising materials C09K17/00; drilling or cutting machines for mining or quarrying E21C; safety devices, transport, rescue, ventilation or drainage E21F)

## Abstract

A reinforcement system includes an adapter, a friction bolt, a drilling rod coupled to the adapter, and a drill bit configured to drill an opening optimally sized for receiving the friction bolt. The drilling rod has a diameter that allows for introduction of the drilling rod into the friction bolt.

## Claims

### Claim 1

A reinforcement system comprising:
an adapter;
a friction bolt;
a drilling rod coupled to the adapter, the drilling rod having a diameter that allows for introduction of the drilling rod into the friction bolt; and
a drill bit configured to drill an opening optimally sized for receiving the friction bolt.

### Claim 2 (depends on 1)

The reinforcement system of claim 1, wherein the adapter includes first and second threaded portions and a neck that acts as a guide and impact element for installing the friction bolt.

### Claim 3 (depends on 2)

The reinforcement system of claim 2, wherein the first threaded portion of the adapter is positioned at one end of the adapter and the second threaded portion is positioned at the other end of the adapter.

### Claim 4 (depends on 2)

The reinforcement system of claim 2, wherein the drilling rod includes a threaded portion engaged with the second threaded portion of the adapter.

### Claim 5 (depends on 4)

The reinforcement system of claim 4, wherein the adapter defines a central passageway along the entire length of the adapter to enable circulation of water or air from a drilling machine.

### Claim 6 (depends on 3)

The reinforcement system of claim 3, wherein the friction bolt defines a passageway that receives a portion of the drilling rod.

### Claim 7 (depends on 2)

The reinforcement system of claim 2, wherein the drilling rod is coupled to the drill bit.

### Claim 8 (depends on 2)

The reinforcement system of claim 2, wherein the drill bit defines a polygonal-shaped recess and the drilling rod includes a polygonal-shaped projection, the polygonal-shaped recess of the drill bit is configured to receive the polygonal-shaped projection of the drilling rod.

### Claim 9

A method of installing a friction bolt comprising:
drilling a borehole using a drill bit coupled to a drilling rod, the drilling rod coupled to an adapter; and
installing a friction bolt simultaneously while drilling the borehole.

### Claim 10 (depends on 9)

The method of claim 9, further comprising removing the adapter and the drill rod from the friction bolt.

### Claim 11 (depends on 10)

The method of claim 10, further comprising leaving the drill bit in the borehole.

### Claim 12 (depends on 9)

The method of claim 9, wherein the friction bolt is installed by impacting the friction bolt while drilling the borehole.