CN2401296Y

CN2401296Y - Inverted cone expanding bit

Info

Publication number: CN2401296Y
Application number: CN 99245554
Authority: CN
Inventors: 杨汉诚
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-12-10
Filing date: 1999-12-10
Publication date: 2000-10-18
Anticipated expiration: 2009-12-10

Abstract

A reverse taper hole-expanding drill bit is characterized in that an open slot is formed in the end portion of a drill rod head, a pair of blades are mounted on two sides of the open slot, rear ends of the blades are respectively fixed on fixing pins at the heel portions of the open slot, a guide hole is formed in the axis of the drill rod head, a sliding ejector rod with a conical surface is mounted in the guide hole, the conical surface of the sliding ejector rod is matched with the cambered surface of the front end of an inner side tool back of the blade, and a fixing screw rod for controlling the displacement range of the sliding ejector rod is designed on the side wall of the drill rod head. The drill bit can expand the inverted cone step bar planting hole, so that the bonding strength of the steel bar, the structural adhesive and the concrete is greatly improved, the quality of the steel bar is ensured, and the cost is reduced.

Description

Inverted taping reamer

The utility model relates to the instrument that building field is used for the bar planting project, refers to a kind of Inverted taping reamer particularly.

The bar planting technology of building trade, be meant and on concrete structure, get out earlier the hole that adheres to specification, in the hole, pour into construction structure glue then, and squeeze into spiral concrete, structure glue and reinforcing bar are fixedly connected, to strengthen the tension shear behavior of building, improve the bulk strength of building.Yet in the existing bar planting technology, the hole of being bored is straight hole, and the degree of depth of being holed is had relatively high expectations, and tension bar planting hole must reach more than the 600mm, and shearing resistance bar planting hole must reach more than the 400mm, otherwise bar planting is difficult to satisfy the intensity of design.Like this, on the one hand the consumption of spiral and construction structure glue is very big, and required manpower, instrument and the power consumption of drilling deep hole is also very big on the other hand, makes building cost high.And the bar planting hole generally is difficult for handling totally in the solid work progress, and construction structure glue and concrete surface adhesive strength are descended, and bar planting does not reach the stress value of design, has stayed unsafe hidden danger to building.

The purpose of this utility model is exactly that a kind of Inverted taping reamer that can process the back taper stepped hole will be provided, to overcome the defective that above-mentioned straight hole is had.

For realizing this purpose, the Inverted taping reamer that the utility model is developed has a drilling rod body that is made of drilling rod head, drilling rod body and shank.The end of shank is shaped on the spline that matches with electric hammer, so as with its clamping on electric hammer.The end design of drilling rod head has an open slot, and the both sides of open slot are equipped with the blade of a pair of edegewise, and the rear end of this blade is separately fixed on the fixing pin of open slot heel, can rotate around fixing pin.The axle center design of drilling rod head has a pilot hole, the sliding mandril of the one band conical surface is installed in the pilot hole, the conical surface of sliding mandril matches with the inboard knife back front end cambered surface of an above-mentioned blade, to push the front end cambered surface of two blades, makes two blades bore the district to two outside rotary impact expansions.The sidewall design of drilling rod head has a standing screw, and the scope of standing screw control sliding mandril displacement is to satisfy the requirement that a blade is drawn in or opened certain angle.After impacting electric hammer and getting out bottom outlet, use the reaming of this drill bit, can form at the inwall in bar planting hole one or more in greatly outside little back taper stepped hole.

Advantage of the present utility model is: expand the contact area that the back taper stepped hole that has increased construction structure glue and concrete surface on the one hand with this drill bit, big outer little in its hole wall on the other hand, colloid can not come off after solidifying, thereby the firm intensity of its integral adhesive significantly improves.The projected depth under equal conditions corresponding bar planting hole can reduce about 200mm, has significantly reduced the consumption of spiral and construction structure glue, has saved the input of the required manpower and materials of drilling deep hole, has reduced construction cost.Simultaneously, clean even the bar planting hole fails thoroughly to handle, its good adhesive property can not make colloid and concrete produce loosening phenomenon yet, has guaranteed the quality of bar planting, has eliminated the hidden danger of building.

Below in conjunction with accompanying drawing embodiment of the present utility model is described in further detail:

Fig. 1 is a kind of sectional structure schematic diagram of Inverted taping reamer;

Fig. 2 is the plan structure schematic diagram of Fig. 1;

Fig. 3 is the adding ribs to building view.

Inverted taping reamer shown in the figure, the drilling rod head 3 that its drilling rod body is linked by integral body, drilling rod body 1 and shank 2 constitute.The end of shank 2 is shaped on the spline 12 that is connected with electric hammer.The end of drilling rod head 3 has an open slot 9, and the both sides of open slot 9 are equipped with the blade 5 of a pair of edegewise, and the rear end of this blade 5 is separately fixed on the fixing pin 6 of open slot 9 heels.The blade cutting angle of blade 5 should be controlled between 115 °～125 °, if blade work time unit pressure is reduced and lower efficiency greater than 125 °; If less than 115 °, then can the increase of speed and cutting output have surpassed the impact torsion that carbide chip can bear because of cutting into, easily cause the damage of blade.Be drilled with a pilot hole 8 on the axial line of drilling rod head 3, the sliding mandril 4 of a band conical surface 10 is installed in the pilot hole 8, the conical surface 10 of sliding mandril 4 matches with the knife back front end cambered surface of blade 5 between the inboard knife back of an above-mentioned blade 5.The conical surface 10 of sliding mandril 4 is key positions that can decision cutting tip 5 be expanded to both sides smoothly.Its tapering should be controlled in 75 °～85 ° scopes.Tapering is crossed the axial impact force that conference increases by 5 pairs of push rod conical surfaces 10 of blade, easily causes the 6 stressed increases of blade fixing pin and damages; Too small then can the making on blade cambered surface and the push rod cone contact-making surface of tapering moved, and fixing pin 6 is damaged because of stressed increase.One standing screw 7 that puts in the pilot hole 8 is installed on the sidewall of drilling rod head 3, and standing screw 7 matches with notch on the sliding mandril 4, controls the size of sliding mandril 4 sliding scales.The residing position of inversed taper platform in the bar planting hole is bored in the length decision of the fore-set 11 of sliding mandril 4.

During the utility model work, earlier in concrete construction 13, get out bottom outlet with the impact electric hammer, then with spline 12 clampings of the shank 2 of this reaming bit on electric hammer, be inserted in the bottom outlet, by the turning effort of electric hammer, rotary impact power is delivered to drilling rod head 3 by shank 2 to the drilling rod body.Sliding mandril 4 this moment stressed back at the bottom of the hole produces an opposition, the knife back front end cambered surface of its conical surface 10 impact extrusion one blade 5, make blade 5 around fixing pin 6 to two sideway swivels, cut corresponding taper sector, thus form inwall outer little in big back taper stepped hole.Change or regulate the fore-set 11 of sliding mandril different length, can in bottom outlet, expand the back taper sector that a plurality of diverse locations, to satisfy the different bonding requirement of strength.Expand the back taper stepped hole after, in it the perfusion construction structure glue 14, squeeze into spiral 15, can obtain good bar planting effect after the curing.

Claims

1, a kind of Inverted taping reamer, has a drilling rod body that constitutes by drilling rod head, drilling rod body and shank, the end of shank is shaped on the spline that matches with electric hammer, it is characterized in that: the end design of drilling rod head has an open slot, the both sides of open slot are equipped with the blade of a pair of edegewise, and the rear end of this blade is separately fixed on the fixing pin of open slot heel; The axle center design of drilling rod head has a pilot hole, and the sliding mandril of a band conical surface is installed in the pilot hole, and the conical surface of sliding mandril matches with the inboard knife back front end cambered surface of an above-mentioned blade; The sidewall design of drilling rod head has the standing screw of a control sliding mandril displacement range.

2, Inverted taping reamer according to claim 1 is characterized in that: the range of taper of the conical surface of said sliding mandril is 75 °～85 °.

3, Inverted taping reamer according to claim 1 and 2 is characterized in that: the blade cutting angle scope of said blade is 115 °～125 °.