CN200940446Y

CN200940446Y - Pile and hole enlaring drill bit for drilling concrete

Info

Publication number: CN200940446Y
Application number: CN 200620127435
Authority: CN
Inventors: 付江
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-08-22
Filing date: 2006-08-22
Publication date: 2007-08-29
Anticipated expiration: 2016-08-22

Abstract

The utility model relates to a drilling which is concretely for a concrete drilling spread pile reaming of the perfusion pile reaming of the concrete steel bar drilling of the high-rise or the large building. The utility model solves the problem of the low reaming velocity of the present reaming method, the inconvenience of the operation and the inadequate utilization of the favorable formation within the scope of the depth of the pile hole. The concrete drilling spread pile reaming drilling comprises a vane, a drilling body which is used for fixing the vane. The drilling body is arranged with a vane substructure which is connected with the fixed vane by a fixing pin. The surface of the fixed end of the vane and the vane substructure is an inclined plane and the crossing part of the end face of the vane and the inner side surface of the vane is arc typed. The utility model completes the reaming of the pile hole and the fold and the unfold of the vane by arranging the flexible vane on the body of the drilling and the simple positive and negative rotation of the vane. The utility model has a simple structure and convenient operation. .

Description

Concrete under-reamed pile reaming bit

Technical field

The utility model relates to a kind of drill bit, specifically is a kind of concrete under-reamed pile reaming bit that is used for high level or the reaming of building reinforcement foundation pump-grouting concrete.

Background technology

At present, the steel bar concrete bored pile is adopted on high level or building basis more, generally mostly is end again and holds friction pile.The most of load of building is born by castinplace pile, and the castinplace pile supporting capacity depends on: one, pile strength; Two, bearing capacity of foundation slab; Three, the frictional force between stake, soil.Castinplace pile passes to foundation soil with load by frictional force between stake, soil and end load, and based on the frictional force between stake, soil.At present a lot of engineerings are taked to add the timber pile footpath and increase stake long in the Pile Foundations Design in order to increase frictional force between grout pile, soil, improve frictional force between stake, soil, and castinplace pile pile body intensity fail to make full use of, and causes waste of material, and cost improves.In order to improve frictional force and the support force between stake, soil: one, adopt bottom expanding drill class drill bit in pore forming process, to carry out reaming, appropriate location, stake hole is expanded into bullet, increase pile capacity, the method is simple, need not increase equipment, but reaming speed is slow, enlarges the bullet limited amount, favourable stratum all can not be used, thereby the bearing capacity of stake improves limited; Two, adopt extruding-spreading device behind pore-forming, to carry out reaming (being compacted bearing disk pile), hole wall by appropriate location, extruded and extended pile hole, make this stake hole, place be extruded closely knit, and increase forms dish type, increased the stratum support force, improve the bearing capacity of stake, but need pore-forming, squeezed two complete equipments, need pore-forming, squeezed and clear hole three process, construction equipment is many, operation is many, efficiency of construction is low, have a strong impact on enforcement, and, a dish limited amount of squeezed formation, the stratum bearing capacity is not given full play to, and the bearing capacity of stake improves limited.

Summary of the invention

The utility model for solve existing expanding method reaming speed slow, use inconvenience and can not make full use of the problem on the favourable stratum in the hole depth scope, a kind of concrete under-reamed pile reaming bit is provided.

The utility model is to adopt following technical scheme to realize: a kind of concrete under-reamed pile reaming bit, comprise fin, be used for fixing the drill main body of fin, drill main body is provided with the fin seat, the fin seat is connected and fixed fin by steady pin, the fixed end end face of fin and fin seat is the inclined plane, and this end face of fin and the infall of fin medial surface are circular-arc.During use, drill main body is fixed on the borer drill rod (before pore-forming, still fixing behind the pore-forming, by the type decided of rig), starts rig, the drilling rod of rig begins rotation, under the effect of rotary centrifugal force, fin launches and can carry out reaming to the stake hole, because the end face of the fixed end of fin and fin seat is the inclined plane, when fin launches, this end face pastes mutually with drill main body, and it is excessive to avoid fin to launch, and can't reaming; During reverse the commentaries on classics, under the effect of rotation centripetal force, fin draws in, and its medial surface is posted by drill main body, finishes reaming, has finally realized the reaming of the equidistant or non-equidistance in pore forming process or behind the pore-forming.Compared with prior art, the utility model adopts the fin seat is set on drill main body, and make fin be connected and fixed on the fin seat by steady pin, make fin under the centrifugal action that rotation produces, can launch to carry out reaming, and when counter-rotating, under the effect of centripetal force, fin draws in and finishes reaming, and is extremely easy to use; Utilize the favourable stratum in the scope of full stake hole fully, improved the bearing capacity of stake.

In addition, the reaming end of described fin is trapezoidal; Like this, after using the utility model reaming, the lifting surface area of the stake that forms increases, and the stressed proterties on stratum changes, and has increased the stratum support force, thereby has improved the bearing capacity of concrete filling pile widely.

The utility model adopts mobile wing is set on drill main body, realizes expansion, the gathering of fin by just changeing simply, reversing, and finishes the reaming in a hole, and it is simple in structure, and is easy to use; Simultaneously, it is trapezoidal that the reaming end of fin adopts, and makes the stake hole shape after the reaming have good stratum support force; Be fit to realize the reaming of high level or building reinforcement foundation pump-grouting concrete.

Description of drawings

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

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

Fig. 3 is the structural representation of fin;

Fig. 4 is an another kind of structural representation of the present utility model;

Fig. 5 is the stake hole pattern behind use the utility model;

Among the figure: the 1-drill main body; 2-fin seat; The 3-fin; The 4-fixed via; The 5-steady pin; The 6-flange; The 7-pin; 8-becomes drill; 9-mud circulation passage.

The specific embodiment

Embodiment 1

Reaming bit described in the utility model is used for rotary drilling rig.

Concrete under-reamed pile reaming bit, comprise fin 3, be used for fixing the drill main body 1 of fin 3, drill main body 1 is provided with fin seat 2, fin seat 2 is connected and fixed fin 3 by steady pin 5, fin 3 is the inclined plane with the fixed end end face of fin seat 2, and the infall of this end face of fin 3 and fin 3 medial surfaces is circular-arc.The reaming end of described fin 3 is trapezoidal; For the drilling rod of realizing drill main body and rig is connected and fixed, drill main body 1 central authorities have and are used for the fixed via 4 that the drilling rod with rig is connected and fixed by pin 7; Fixed via 4 is a square.

Because it is very convenient that rotary drilling rig bores up and down, therefore can normal earlier pore-forming after, become drill 8 under changing, be connected and fixed reaming bit described in the utility model by pin again, during following brill, fin is in rounding state, during instantly to predetermined reaming position, be rotated in the forward, fin is opened, and hole wall is carried out reaming, after this place's reaming finishes, reverse rotation is drawn fin in, is just changeing to next reaming position down to carry out reaming and get final product again.Reaming finishes counter-rotating, and fin draws in carries brill.

Embodiment 2

Reaming bit described in the utility model is used for slewing drilling machine.

Concrete under-reamed pile reaming bit, comprise fin 3, be used for fixing the drill main body 1 of fin 3, drill main body 1 is provided with fin seat 2, fin seat 2 is connected and fixed fin 3 by steady pin 5, fin 3 is the inclined plane with the fixed end end face of fin seat 2, and the infall of this end face of fin 3 and fin 3 medial surfaces is circular-arc.The reaming end of described fin 3 is trapezoidal; In order to realize that drill main body is connected and fixed with become drill, the drilling rod of rig, the two ends up and down of drill main body 1 are provided with flange 6, and drill main body 1 central authorities have mud circulation passage 9.

Slewing drilling machine is different from rotary drilling rig, and it puts drilling tool wastes time and energy, and therefore, puts the drilling tool consideration of wasting time and energy from slewing drilling machine, puts the brill number of times in order to reduce, and shortens the engineering time, increases work efficiency.Before using the slewing drilling machine perforate, the drilling rod that reaming bit is connected on slewing drilling machine by flange with become between the drill, the mud circulation passage that drill main body central authorities offer communicates with the mud circulation passage of the one-tenth drill of rig, drilling rod; And the fin of reaming bit drawn in, normal (just changeing) drilling and forming hole of beginning (making the rotation direction that fin opens and the direction of rotation of pore-forming drill bit drilling and forming hole), after creeping into the predetermined reaming degree of depth, stop drilling and forming hole, counter-rotating simultaneously opens the fin of reaming bit to carry out reaming, limit pore-forming limit reaming like this up to the design hole depth, has greatly been saved the engineering time.

Claims

1, a kind of concrete under-reamed pile reaming bit, comprise fin (3), be used for fixing the drill main body (1) of fin (3), it is characterized in that drill main body (1) is provided with fin seat (2), fin seat (2) is connected and fixed fin (3) by steady pin (5), fin (3) is the inclined plane with the fixed end end face of fin seat (2), and the infall of this end face of fin (3) and fin (3) medial surface is circular-arc.

2, concrete under-reamed pile reaming bit according to claim 1, the reaming end that it is characterized in that described fin (3) is trapezoidal.

3, concrete under-reamed pile reaming bit according to claim 1 and 2 is characterized in that drill main body (1) central authorities have and is used for the fixed via (4) that the drilling rod with rig is connected and fixed by pin (7); Fixed via (4) is a square.

4, concrete under-reamed pile reaming bit according to claim 1 and 2 it is characterized in that the two ends up and down of drill main body (1) are provided with flange (6), and drill main body (1) central authorities has mud circulation passage (9).