CN102650193A

CN102650193A - Combined drill

Info

Publication number: CN102650193A
Application number: CN2012101520729A
Authority: CN
Inventors: 周建明; 施鸣升; 徐雷云
Original assignee: NENGGENG FUNDATION ENGINEERING Co Ltd SUZHOU CITY
Current assignee: NENGGENG FUNDATION ENGINEERING Co Ltd SUZHOU CITY
Priority date: 2012-05-17
Filing date: 2012-05-17
Publication date: 2012-08-29

Abstract

The invention discloses a combined drill which comprises a drill bit part and a reaming part. The drill bit part comprises a drill bit rod and a drill bit; the drill bit is arranged at the front end part of the drill bit rod; a first through hole is arranged at the center of the drill bit rod; the reaming part is arranged at the rear end of the drill bit part; the reaming part comprises a reaming seat, a reaming cutter and a second through hole; the second through hole is arranged at the center of the reaming seat; the second through hole is communicated with the first communication hole; the reaming cutter is arranged on the peripheral wall of the reaming seat; and when the reaming cutter is applied with an external force of which the direction is the same with the drilling direction of the drill bit, the radius of the reaming cutter can be reduced. According to the scheme disclosed by the invention, the reaming can be carried out by the reaming part in the drilling process of the drill bit; the insertion of the combined drill into a protecting wall pipe of which the outer diameter can be greater than that of the drill bit and less than or equal to that of the reaming part can be easily implemented; and when the reaming cutter is applied with the external force of which the direction is the same with the drilling direction of the drill bit, the radius of the reaming cutter can be reduced, so that when the combined drill needs to be pulled out, the combined drill can be conveniently pulled out from the protecting wall pipe.

Description

A kind of combined drill

Technical field

The present invention relates to a kind of improvement of drill bit, refer to a kind of combined drill that makes things convenient for protection casing to insert in the hole that drill bit bored and make things convenient for the taking-up of drill bit especially, belong to capital construction and improve technical field with drill bit.

Background technology

In capital works; Often need carry out bore operation, in the process that drill bit creeps into, be the caving in of the hole that prevents to have bored, need in the hole of having bored, insert the retaining wall pipe with drill bit; The external diameter of retaining wall pipe is much the same with hole-drilled internal diameter, like this to make things convenient for the insertion of retaining wall pipe; If boring so earlier always, the retaining wall pipe that follows up is then operated down, to the end, can find that drill bit cannot take out, thereby, need improve the structure of drill bit, to adapt to the needs of this bore operation.

Summary of the invention

Technical problem to above-mentioned existence the objective of the invention is: proposed a kind of combined drill that makes things convenient for protection casing to insert in the hole that drill bit bored and make things convenient for the taking-up of drill bit.

Technical solution of the present invention is achieved in that a kind of combined drill, comprises bit head, reamer; Said bit head comprises drill bit shaft, drill bit; Said drill bit is arranged on the leading section of drill bit shaft; The center of said drill bit shaft is provided with first through hole; Said reamer is arranged on the rear end of bit head; Said reamer comprises reaming seat, cornish bit, second through hole; Said second through hole is arranged on the center of reaming seat; Said second through hole is communicated with first through hole; Said cornish bit is provided with on the circle wall of reaming seat; When cornish bit received the external force identical with the drill bit drilling direction, the radius of said cornish bit can dwindle.

Preferably, the sidewall of said reaming seat is provided with groove, and said cornish bit is arranged in the groove through axis of rotation.

Preferably, be provided with spring between said cornish bit and the groove.

Preferably, said cornish bit is triangular in shape or fan-shaped, and the longest edge of said cornish bit is arranged on the top.

Because the utilization of technique scheme, the present invention compared with prior art has advantage:

Combined drill of the present invention can carry out reaming through reamer simultaneously in the process that drill bit creeps into; And then insertion retaining wall pipe; The external diameter of said retaining wall pipe can be less than or equal to the external diameter of reamer greater than the external diameter of drill bit, during the retaining wall pipe of this specification inserts the most easily and holed, after bit drills puts in place; In the time of need extracting combined drill; Because the cornish bit of combined drill is when receiving the external force identical with the drill bit drilling direction, the radius of said cornish bit can dwindle, and can easily combined drill be extracted from the retaining wall pipe like this; The present invention program is simple in structure, easy to operate, practical.

Description of drawings

Below in conjunction with accompanying drawing technical scheme of the present invention is described further:

Accompanying drawing 1 is the sketch map of combined drill of the present invention;

Accompanying drawing 2 is the partial sectional view of the bit head of combined drill of the present invention;

Accompanying drawing 3 is the front view of the reamer of combined drill of the present invention;

Accompanying drawing 4 is the vertical view of the reamer of combined drill of the present invention;

Wherein: 1, bit head; 2, reamer; 11, drill bit shaft; 12, drill bit; 13, first through hole; 21, reaming seat; 22, cornish bit; 23, second through hole; 24, groove; 25, axis of rotation.

The specific embodiment

Below in conjunction with accompanying drawing the present invention is described.

Be depicted as a kind of combined drill of the present invention like Fig. 1-4, comprise bit head 1, reamer 2; Said bit head 1 comprises drill bit shaft 11, drill bit 12; Said drill bit 12 is arranged on the leading section of drill bit shaft 11; The center of said drill bit shaft 11 is provided with first through hole 13; Said reamer 2 is arranged on the rear end of bit head 1; Said reamer 2 comprises reaming seat 21, cornish bit 22, second through hole 23; Said second through hole 23 is arranged on the center of reaming seat 21; Said second through hole 23 is communicated with first through hole 13; Said cornish bit 22 is provided with on the circle wall of reaming seat 21; In the present embodiment, the sidewall of said reaming seat 21 is provided with groove 24, and said cornish bit 22 is arranged in the groove 24 through axis of rotation 25; Be provided with spring (not marking) between said cornish bit 22 and the groove 24, so that cornish bit 22 has the ability of stable maintenance certain radius; Said cornish bit 22 is triangular in shape or fan-shaped, and the longest edge of said cornish bit 22 is arranged on the top, and when cornish bit 22 received the external force identical with the drill bit drilling direction, the radius of said cornish bit 22 can dwindle.

Combined drill of the present invention can carry out reaming through reamer 2 simultaneously in the process that drill bit 12 creeps into; And then insertion retaining wall pipe; The external diameter of said retaining wall pipe can be less than or equal to the external diameter of reamer greater than the external diameter of drill bit, during the retaining wall pipe of this specification inserts the most easily and holed, after drill bit 12 gets into the position; In the time of need extracting combined drill; Because the cornish bit 22 of combined drill is when receiving the external force identical with the drill bit drilling direction, the radius of said cornish bit 22 can dwindle, and can easily combined drill be extracted from the retaining wall pipe like this; The present invention program is simple in structure, easy to operate, practical.

The foregoing description only is explanation technical conceive of the present invention and characteristics; Its purpose is to let the personage that is familiar with this technology can understand content of the present invention and implements; Can not limit protection scope of the present invention with this; All equivalences that spirit is done according to the present invention change or modify, and all should be encompassed in protection scope of the present invention.

Claims

1. a combined drill is characterized in that: comprise bit head, reamer; Said bit head comprises drill bit shaft, drill bit; Said drill bit is arranged on the leading section of drill bit shaft; The center of said drill bit shaft is provided with first through hole; Said reamer is arranged on the rear end of bit head; Said reamer comprises reaming seat, cornish bit, second through hole; Said second through hole is arranged on the center of reaming seat; Said second through hole is communicated with first through hole; Said cornish bit is provided with on the circle wall of reaming seat; When cornish bit received the external force identical with the drill bit drilling direction, the radius of said cornish bit can dwindle.

2. combined drill according to claim 1 is characterized in that: the sidewall of said reaming seat is provided with groove, and said cornish bit is arranged in the groove through axis of rotation.

3. combined drill according to claim 2 is characterized in that: be provided with spring between said cornish bit and the groove.

4. according to claim 1 or 2 or 3 described combined drills, it is characterized in that: said cornish bit is triangular in shape or fan-shaped, and the longest edge of said cornish bit is arranged on the top.