CN2301530Y

CN2301530Y - Anchor rod base-enlarging drill bit

Info

Publication number: CN2301530Y
Application number: CN 97221000
Authority: CN
Inventors: 刘三意; 李洪; 刘家荣; 董欣
Original assignee: INST OF PROSPECTING TECHNOLOGY MINISTRY OF GEOLOGY AND MINERALS
Current assignee: INST OF PROSPECTING TECHNOLOGY MINISTRY OF GEOLOGY AND MINERALS
Priority date: 1997-08-06
Filing date: 1997-08-06
Publication date: 1998-12-23
Anticipated expiration: 2007-08-06

Abstract

The utility model provides an anchor rod base-enlarging drill bit which is mainly used for the construction of the anchorage, the slope protection and the landslip treatment of foundation engineering and the protective engineering of geological calamity. The utility model is characterized in that a rack and gear mechanism and a driving contorted sleeve make base-enlarging blades spread out and shrink at any time during base enlargement and make base enlargement and drilling operation completed one time, and multiple stages of base enlargement can be realized. When the anchor rod base-enlarging drill bit is used for construction, the efficiency of construction can be improved, and the labor intensity can be reduced. The utility model has the advantages of simple structure and low cost.

Description

Anchor rod base-enlarging drill bit

The utility model belongs to engineering construction and creeps into the field, and particularly a kind of anchor pole expands end device.

At present, the major part that China's anchoring engineering construction is adopted is a footpath anchor pole on earth, and expansion end anchor pole use amount is few, mainly is owing to there is not suitable Anchor rod base-enlarging drill bit.Domestic existing Anchor rod base-enlarging drill bit mainly contains two kinds, a kind of is power with the circulatory mediator, but because its strength is less, the scope of application is restricted, the another kind of linkage that adopts, but because structure is complicated, it expands the end directly through less, be difficult to use in the anchor pole expanded bore pile of little straight warp, expansion need be carried at the end and bore more bit change, and labour intensity is big.Along with the continuous development of highrise building and carrying out of national environmental protection engineering and hazards control engineering, foundation excavation is more and more darker, and the slope treatment engineering is also increasing, and is also increasing to the requirement of anti-pulling of anchor bar.Therefore adopt and expand end anchor pole, become a kind of trend of anchoring engineering development.

The purpose of this utility model is to provide a kind of and owing to increase rack and pinion mechanism the expansion bed plate wing can be opened and shrink at any time at the bottom of the hole, the expansion end is finished with creeping into once, and can realize the Anchor rod base-enlarging drill bit at the bottom of the multistage expansion.

The utility model mainly comprises tapered joint head 1, torsion pass cover 2, spring 3, depression bar 4, reaming body 5, wing 8 etc., it is characterized in that, comprise that also tooth bar 6, gear 7, tooth bar 6 are fixed on the depression bar 4, gear 7 is fixed on the wing 8, tooth bar 6 and gear 7 are meshing with each other, one side of each key on the reaming body 5 has 1-2 grooving, and torsion pass cover 2 and reaming body 5 interconnect by 2-6 key that cooperatively interacts.

Know-why of the present utility model is, when normally creeping into, wing 8 is in contraction state, and key is pressed on the key of reaming body 5 on the torsion pass cover 2, and is in the grooving, can not slide up and down vertically.When drilling tool turned round, torsion pass cover 2 passed to reaming body 5 with pressure and moment of torsion, makes it drive hole subdrilling head 9 and creeps into.

When hole subdrilling head 9 creeps into to predetermined stratum, stop to creep into, make the drilling rod counter-rotating, because the frictional resistance of hole subdrilling head 9 makes torsion pass cover 2 relatively rotate with reaming body 5, the key of torsion pass cover 2 produces then, and pressurization feeds, tapered joint head 1 glides the idle stroke of covering one section reservation when touching depression bar 4 with torsion pass cover 2, stops gliding.Start the rig revolution this moment and slowly pressurize and feed, rotary torque is passed to reaming body 5 by torsion pass cover 2, make reaming body 5 drive wing 8 revolutions, but because the key on the torsion pass cover 2 is not in grooving, can only transfer torque and can not transmit drilling pressure, reaming body 5 and hole subdrilling head 9 can only turn round and can not creep into.When rig fed pressurization, drilling pressure promoted depression bar 4 by tapered joint head 1 and glides, and makes tooth bar 6 simultaneously to lower slider, and tooth bar 6 just drives gear 7 revolutions that are mated when gliding, make wing 8 open sectility hole wall simultaneously gradually, thereby realize expanding at the end.

When tapered joint head 1 promotes depression bar 4 downslides, torsion pass cover 2 glides simultaneously, when sliding to bottom dead centre, wing 8 is flared to maximum, because the drilling tool revolution, the key on the torsion pass cover 2 enters down in the grooving, at this moment automatically, drilling pressure and moment of torsion just pass to reaming body 5 by torsion pass cover 2, it is crept into simultaneously with wing 8 and hole subdrilling head 9 and expand at the end.

Rig stops revolution and counter-rotating after expanding the bear building-up bundle, and torsion pass cover 2 is relatively rotated with reaming body 5, and the key on the torsion pass cover 2 withdraws from down grooving, and meanwhile, depression bar 4 and tooth bar 6 are also upwards return, and makes gear 7 drive wing 8 and gets back to contraction state simultaneously.At this moment, both whole drilling tools can be proposed boring, and also can continue to creep into, and carry out expanding at the end second time.

The utility model has the advantages that:

1. owing to increased rack and pinion mechanism, bellout diameter increases 2-3 doubly.

2. can at the bottom of the hole, whether open fully at the ground detection bottom expanding drill.

3. do not need more bit change before at the bottom of the expansion, creep into and expand the end and once finish, and can realize multistage reaming, improve efficiency of construction, reduce labour intensity, simple in structure.

Description of drawings:

Fig. 1 is the Anchor rod base-enlarging drill bit structural representation

1--tapered joint head among the figure, 2--torsion pass cover, 3--spring, 4--depression bar,

5--reaming body, 6--tooth bar, 7--gear, 8--wing, 9--hole subdrilling head.

Claims

1. Anchor rod base-enlarging drill bit, comprise tapered joint head (1), torsion pass cover (2), spring (3), depression bar (4), reaming body (5), wing (8) etc., it is characterized in that, also comprise tooth bar (6), gear (7), tooth bar (6) is fixed on the depression bar (4), and gear (7) is fixed on the wing (8), and tooth bar (6) and gear (7) are meshing with each other, one side of each key on the reaming body (5) has 1-2 grooving, and torsion pass cover (2) and reaming body (5) interconnect by 2-6 key that cooperatively interacts.