CN2092595U

CN2092595U - Bits for rock hole-expending

Info

Publication number: CN2092595U
Application number: CN 90225335
Authority: CN
Inventors: 陈满成; 李泽; 杜国雄; 邱振华
Original assignee: Individual
Current assignee: Individual
Priority date: 1990-11-28
Filing date: 1990-11-28
Publication date: 1992-01-08
Also published as: CN2103118U

Abstract

The utility model relates to a hole expanding drill bit capable of expanding holes in middle weathered and weak weathered bedrocks. The hole expanding drill bit adopts more than two hole expanding cutters, wherein, when the drill bit rotates, the hole expanding cutter expand radially; when the holes are expanded to maximum, the expanded hole expanding cutters, a fixed cutter, and a centered drill bit form drill bit integration to drill continuously; the hole expanding depth is controllable; the hole expanding pile bottom is made into a conic top cylindrical shape to meet the optimal requirement of structural design of civil engineering.

Description

Bits for rock hole-expending

The utility model relates to a kind of drill bit, particularly a kind of drill bit that is used for the rock reaming.

Stake at the bottom of general employing stretched formula stake and the reaming in the construction work, for highrise building, bridge etc., the requirement for bearing capacity of stake is very high.If with the stake of stretched formula, generally take the construction technology of many on a post, plural single pile with steel bar concrete water pile platform, is played post again on the stake platform, the stake number that this construction technology needs is many, and the Master Cost of stake platform is very big, causes significant wastage.Based on these shortcomings, people propose a kind of vertex of a cone garden cylindricality expanded bore pile, increase the stake floor space, strengthen the bearing capacity of stake, realize the construction technology of single-column single pile.At present the mechanical hole reaming drill bit that adopts all can only expand into the taper expanded bore pile, this stake type pile body and cone bond sites easy fracture, and the cone angle position of cone can produce the dead angle when pouring into, cause actual counter bore diameter littler than design data; In addition, behind the reaming bit counterboring, drill bit can not continue to creep into, and the reaming degree of depth can't strengthen, and the reaming effect can not guarantee.And at present general reaming bit is used for scar sand layer more, and supporting effect is lower.

The utility model proposes a kind of novel reaming bit at above weak point, makes it can expand the vertex of a cone garden cylindricality expanded bore pile that the different-diameter and the degree of depth in middle weathering, gentle breeze basement rock.

The utility model is by pilot bit, fixedly cutlery, axle, reaming cutlery, bit body, upper and lower supporting base, connecting rod, spline housing, splined shaft etc. are formed.The reaming cutlery is falcate, and the reaming cutlery, fixedly cutlery and the equal iron chains of pilot bit have carbide alloy, can reaming in middle weathering, gentle breeze basement rock, creep into.During construction, earlier with common drill bit with the stake hole drill to appropriate depth, use this reaming bit instead, with drilling rod with reaming bit at the bottom of the hole, drilling rod is exerted pressure, the stressed expansion of reaming cutlery, pilot bit is subjected at the bottom of the hole counter-force also to impel reaming cutlery radial expansion promptly equably, when extending to extreme position, the reaming cutlery is horizontal level.During the expansion of reaming cutlery, drill bit continues to creep into, and forms countersinking this moment; To the utmost point prescribe a time limit when the reaming cutlery expands, drill bit continues to creep into the diameter of expansion, and the degree of depth is come fixed as required, forms garden cylindricality reaming this moment.Reaming finishes, and the stake bottom forms vertex of a cone garden cylindricality, reaches the civil Engineering Design requirement.There are a plurality of nozzles the bit body lower end, and high speed mud is discharged landwaste in time by nozzle by the bit body top.

Now the utility model is described in further detail in conjunction with the accompanying drawings:

Fig. 1 is reamer bit structure figure of the present utility model.

Fig. 2 is the structure chart in reaming cutlery when expansion of Fig. 1.

This illustrated embodiment be adopt four reaming cutlery, four the fixing reaming bit of cutlery.By shown in Figure 1, reaming cutlery (4) fixes on the spline housing (9) with hinges fixing, and reaming cutlery (4) middle part is fixed on the bit body axle (3) with hinge and connecting rod (7); Bit body (5) is the drill bit of a fixed diameter, and the bottom has and the corresponding fixedly cutlery of reaming cutlery (4) (2), and the bottom is a centering drill bit (1), and spline housing (9) is connected with drilling rod, and splined shaft (10) is fixed on the bit body.Reaming cutlery (4), fixedly on cutlery (2) and the pilot bit all iron chains carbide alloy is arranged.Upper branching holder (8) and lower support seat (6) play supporting role.

During the drill bit rotation, the drilling rod axial force makes spline housing (9) move down along splined shaft (10), the stressed radial expansion of reaming cutlery (4), counter-force was also impelled reaming cutlery (4) radial expansion equably at the bottom of reaming bit crept into Shi Shoukong, form the taper reaming this moment, reaming cutlery (4) expands to the limit, be horizontal level, as shown in Figure 2, this moment, reaming bit continued to creep into the expansion diameter, formed garden cylindricality reaming, and it is fixed that the degree of depth can need to come by design, there are a plurality of nozzles at pilot bit (1) position, and high speed mud discharges landwaste in time by nozzle through bit body (5) top.The vertex of a cone garden cylindricality that forms at last expands foundation, reaches the best requirement of stake at the bottom of the reaming.This stake type has improved the bearing capacity of stake greatly, horizontal drag and anti-seismic performance are all improved, and reduced the stake number significantly, fully realized the construction technology of single-column single pile, basically whole platforms have been save, shortened the duration, saved material and cost, bigger economic benefit and social benefit have been arranged.

The embodiment effect:

Guangdong thermo-power station factory building, soil property below 10 meters is middle weathered rocks, former design stretched formula hammering castinplace pile, after use stake at the bottom of the reaming of this drill bit instead, 500 millimeters of basic bore dias, dark 10000 millimeters, expand into stake at the bottom of the cylindricality of vertex of a cone garden, 800 millimeters of end stake diameters, 200 millimeters of vertex of a cone height, 200 millimeters of garden post height, i.e. 400 millimeters of stake high altitudes at the bottom of the reaming.Result of implementation economical with materials 54%, cost are saved 38.8 ten thousand yuan, have shortened the duration.

Claims

1, a kind of reaming bit is by bit body (5), fixedly cutlery (2), pilot bit (1), axle (3) etc. are formed, it is characterized in that having on the reaming bit reaming cutlery (4), reaming cutlery (4) one ends fix on the spline housing (9) with hinges fixing, the middle part is fixed on the bit body axle (3) with hinge and connecting rod (7), spline housing (9) can be gone up at splined shaft (10) and move, splined shaft (10) is fixed on the bit body, during the drill bit rotation, the drilling rod axial force makes reaming cutlery (4) radial expansion, and drill bit continues to creep into the diameter of expansion.

2, reaming bit according to claim 1, the reaming cutlery that it is characterized in that reaming bit can be on two more than.