CN2612791Y

CN2612791Y - Reaming bit

Info

Publication number: CN2612791Y
Application number: CN 03223512
Authority: CN
Inventors: 张阳生; 蒋春保; 黄洪亮; 张明; 张冬生
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-01-29
Filing date: 2003-01-29
Publication date: 2004-04-21
Anticipated expiration: 2013-01-29

Abstract

The utility model discloses a ream bit, prior ream devices mostly need a hydraulic system and an executive mechanism, and have the disadvantages of complex structure, high cost and inconvenient use and maintenance. The utility model comprises a drill rod and a bit, wherein at least two airfoil drilling tablets are arranged on the bit, the airfoil drilling tablets are articulated with the bit through pins, and cutting boundary of the airfoil drilling tablets and a vertical line take a certain angle in natural state. The utility model is widely used in construction of enlarging pile body or pile bottom of a grouting pile.

Description

A kind of reaming bit

Technical field

The utility model relates to a kind of drill bit, particularly a kind of reaming bit that enlarges castinplace pile pile body or stake bottom.

Background technology

For building foundation or first layer ground uneven subsidence, adopt the pile foundation underpinning method to reinforce usually at present.Its way is: at first needs add the stake the position chisel former basis and original ground, the new underpinned pile of constructing is established joist or bracket then underpinned pile and former basis is linked together, and recovers ruined ground at last.This method has the following disadvantages: 1. and bigger to the original building foundation failure in construction, increased construction risk; 2. the stressed complexity of the connect mechanism on underpinned pile and former basis, power transmission route complications, the construction works amount is big, and is long in time limit; 3. for the connect mechanism on construction underpinned pile and underpinned pile and former basis, must destroy the original ground finishing, increase the cost that recover on ground greatly original ground large tracts of land excavation.

In addition, bored pile often adopts the way that enlarges the stake base diameter to improve the supporting capacity and the resistance to plucking ability of stake at present, and existing Counterboring apparatus mostly needs hydraulic system and executing agency, complex structure, the cost height, the working service inconvenience is restricted in actual use.

Summary of the invention

In order to overcome the deficiencies in the prior art, the utility model provides a kind of can pass less hole, the reaming bit of construction larger cross-section stake.

The technical scheme that its technical problem that solves the utility model adopts is: a kind of reaming bit, comprise drilling rod and drill bit, two aerofoil profiles are housed on drill bit at least bore sheet, aerofoil profile brill sheet is by pin and drill bit is hinged and its cutting edge is angled with vertical line under nature.

Drill bit is made up of three drill bit sheets that are mutually hexagonal angle, on the every drill bit sheet leaf length is housed and bores sheet greater than the aerofoil profile of drill bit leaf length.

The beneficial effects of the utility model are: bore sheet because aerofoil profile is housed on drill bit, aerofoil profile brill sheet is opened automatically during boring, thereby reaches the reaming purpose.The utility model can pass less hole, carries out the construction of larger cross-section stake, when adopting the pile foundation underpinning underpinning, with destroying the original building basis, does not need to be provided with specially the connect mechanism on underpinned pile and former basis hardly, significantly reduces construction costs.The utility model can be formed by the simple transformation of the way of common drill bit, and simple in structure, easy and simple to handle, cost is low, and is practical.

Description of drawings

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is the vertical view of Fig. 1;

Fig. 3 is a kind of construction schematic diagram that uses the utility model to construct when adopting pile foundation underpinning stake underpinning;

Fig. 4 is the structural representation of the utility model under user mode.

The specific embodiment

With reference to Fig. 1, Fig. 2, three drill bit sheets 2 that are mutually hexagonal angle are housed on the drilling rod 1, every drill bit sheet 2 is hinged with a slice aerofoil profile brill sheet 3 by pin 4; Aerofoil profile is bored the length of the length of sheet 3 greater than drill bit sheet 2, near the cutting edge place of aerofoil profile brill sheet 3 positive stop 6 is housed on the every drill bit sheet 2, positive stop 6 make aerofoil profile bore sheet 3 under nature with vertical line at angle, and make when boring aerofoil profile bore sheet 3 and can only rotate around pin 4 toward the direction that open, aerofoil profile is bored smooth opening under the centrifugal action of sheet 3 when the reaction force of soil and rotation during with convenient boring; Between per two drill bit sheets 2, the aerofoil profile top of boring sheet 3 is welded with gripper shoe 5, work to support aerofoil profile brill sheet 3 and down creep into; Ball 7 is embedded in aerofoil profile and bores between sheet 3 and the drill bit sheet 2, the frictional resistance when boring sheet 3 rotations to reduce aerofoil profile; Blade 8 welding-ons bore the direction of the sheet 3 cutting soil bodys in drill bit sheet 2 and aerofoil profile.After boring is finished, promote drilling rod 1, aerofoil profile is bored sheet 3 and is drawn in automatically under deadweight.

The sheet number that above-mentioned drill bit sheet 2 and aerofoil profile are bored sheet 3 can be decided according to the actual requirements.

With reference to Fig. 3, when adopting the pile foundation underpinning underpinning, earlier on former basic 9, bore aperture 10 with common drill bit, pass the aperture 10 that has bored on former basis with reaming bit again, in former basic 9 times borings, because reaction force and aerofoil profile that soil bores sheet 3 to aerofoil profile are bored the centrifugal force that sheet 3 produces when drilling rod rotates, aerofoil profile is bored sheet 3 and is opened automatically during boring, with reference to Fig. 4, aperture 10 is enlarged at former basic 9 times formation expanded holes 11 to desired depth.

Claims

1. a reaming bit comprises drilling rod (1) and drill bit, it is characterized in that being equipped with at least on the drill bit two aerofoil profiles and bores sheet (3), and aerofoil profile brill sheet (3) is by pin (4) and drill bit is hinged and its cutting edge is angled with vertical line under nature.

2. a kind of reaming bit according to claim 1 is characterized in that drill bit is made up of three drill bit sheets (2) that are mutually hexagonal angle, a leaf length is housed on the every drill bit sheet (2) bores sheet (3) greater than the aerofoil profile of drill bit sheet (2) length.

3. a kind of reaming bit according to claim 2, it is angled by positive stop (6) and vertical line to it is characterized in that aerofoil profile is bored sheet (3).

4. a kind of reaming bit according to claim 3 is characterized in that between aerofoil profile brill sheet (3) and the drill bit sheet (2) ball (7) being housed.