GB2202471A

GB2202471A - Drill grinding

Info

Publication number: GB2202471A
Application number: GB08803831A
Authority: GB
Inventors: Roger Alfred Bullivant
Original assignee: Roxbury Ltd
Current assignee: Roxbury Ltd
Priority date: 1987-03-24
Filing date: 1988-02-18
Publication date: 1988-09-28
Also published as: GB8803831D0; GB8706924D0

Abstract

A framework for a drill assembly comprises a cylinder 20 provided with an outwardly directed flange 22 at its upper end adapted to provide a support for the drill shank during drilling. Three equispaced slots 24 are formed through the cylinder wall with their axes parallel to the axis of the cylinder. A drill guide 26 provided at the lower end of each slot 24, each guide comprising an upwardly concave inclined member fixed to the internal wall of the cylinder and projecting thereinto. The framework is inserted in a hole adjacent a wall to be drilled to enable downwardly angled holes to be made in the wall for reinforcing. <IMAGE>

Description

Improvements in or Relating to Drilling Assemblies The present invention concerns improvements in or relating to drilling assemblies, especially but not exclusively drilling assemblies suitable for use in the method of supporting building structures disclosed in our pending UK Patent Application 2186310.

According to the present invention there is provided a drilling assembly including a framework adapted to be supported alongside a structure to be drilled and having a passage therethrough to accommodate and guide a drill bit and a support spaced from said passage adapted to support the shank of the drill bit.

Preferably at least two additional passages are provided through the framework, the additional passages being arranged on each side of the said passage. Each passage may comprise a slot which is substantially vertical in use.

Preferably the framework is a cylinder provided at its upper end with an outwardly directed flange, the upper edge of the cylinder providing the support for the shank of the drill bit.

Preferably at the lower end of each passage there is provided a drill guide extending within the cylinder. The drill guide may be concave.

Also according to the present invention there is provided a method of drilling an inclined hole into a structure below ground level, the method comprising forming a first hole adjacent the structure, placing a framework in the first hole, and drilling an inclined hole from the first hole into the structure through an opening in the framework whilst supporting the drill shank with the structure at a location spaced from the opening.

An embodiment of the present invention will now be described by way of example only with reference to the accompanying drawings in which: Fig. 1 shows a drilling assembly in operation; Fig. 2 shows an end elevation of the assembly; Fig. 3 shows a front elevation of the assembly; and Fig. 4 shows a sectional plan on the line III-III of Fig. 3.

Fig. 1 shows a cross-section through a wall 10 of a building structure which has to be supported utilising a method disclosed in our co-pending UK Patent Application 2186310. The method involves forming a pile 12 alongside the building by any suitable method and inserting and anchoring tie members into the building, the tie members being connected with pile reinforcing rods (not shown) running in the longitudinal direction of the pile 12. The tie members are inserted and anchored in the building by drilling passages 14 into the building using a hand-held rock drill 16 having an elongated bit 18. When the passage or passages 14 have been formed the tie members can be inserted and anchored therein by suitable grouting or adhesive.

In practice, it has been found difficult to drill satisfactory passages 14 into the wall especially at the commencement of a drilling 'operation as the drill bit tends to wander away from the desired location.

The present invention provides a drilling assembly to guide the drill bit during the drilling operation and especially at the start of a drilling operation.

It comprises a framework in the form of a steel cylinder 20 provided with an outwardly directed flange 22 at its upper end. Three equi-spaced slots 24 are formed through the cylinder wall with their axes parallel to the axis of the cylinder, the width of each slot being slightly greater than the maximum diameter of the drill bit. At the lower end of each slot 24 there is provided a drill guide 26 which comprises an upwardly concave inclined member fixed to the internal wall of the cylinder 20, projecting into the cylinder.

It will be realised that to drill a passage 14 the drilling assembly is dropped into the top of the hole formed by the pile 12 until abutment of the flange 22 against the ground at ground level arrests the movement of the assembly. The drill 16 can then be presented to the building by passing its bit 18 through the chosen passage 24 with the tip of the bit guided by the drill guide 26. The correct drilling angle can then be ensured by resting the drill shank against the upper edge of the cylinder 20 and the drilling operation can commence, movement of the drill in all but its longitudinal direction being prevented by the combination of the slot 24 and guide 26.

Various modifications can be made without departing from the scope of the invention, for example it is not necessary that the framework is a cylinder.

It can comprise a number of interconnected members each member having or defining a slot 24 or an equivalent thereof. The members can be interconnected to a top piece which supports the assembly at the top of the hole and also provides a support for the shank of the drill bit.

Claims

Claims:

1. A drilling assembly including a framework adapted to be supported ~alongside a structure to be drilled and having a passage therethrough to accomodate and guide a drill bit and a support spaced from said passage adapted to support the shank of the drill bit.

2. An assembly according to claim 1, in which at least two additional passages are provided through the framework.

3. An assembly according to claim 2, in which the additional passages are arranged on each side of the said passage.

4. An assembly according to any of claim 1 to 3, in which the or each passage comprises a slot which is substantially vertical in use.

5. An assembly according to any of the preceding claims, in which the framework is a cylinder provided at its upper end with an outwardly directed flange, the upper edge of the cylinder providing the support for the shank of the drill bit.

6. An assembly according to claim 5, in which there is provided at the lower end of the or each passage a drill guide extending within the cylinder.

7. An assembly according. to claim 6, in which the drill guide is concave.

8. A method of drilling an inclined hole into a structure below ground level, the method comprising forming a first hole adjacent the structure, placing a framework in the first hole, and drilling an inclined hole from the first hole into the structure through an opening in the framework whilst supporting the drill shank with the structure at a location spaced from the opening.

9 A method according to claim 8, in which the framework is placed principally within the first hole with a part thereof extending above the first hole, and said part supporting the drill shank.

10. A method according to claim 8 or 9, in which the drill bit is guided into the opening by a guide provided on the framework.

11. A drilling assembly substantially as hereinbefore described with reference to the accompanying drawings.

12. A method of drilling an inclined hole into a structure below ground level substantially as hereinbefore described with reference to the accompanying drawings.

13. Any novel subject matter or combination including novel subject matter herein disclosed, whether or not within the scope of or relating to the same invention as any of the preceding claims.