CN219176266U - Cage type drill bit and diving drilling machine - Google Patents

Abstract

The cage type drill bit comprises a drill point, a lower circular ring, an upper circular ring, a central tube, a cutting tool bit group, a connecting plate and an inclined rod, wherein the drill point is a triangular plate, the bottom edge of the triangular plate is fixedly arranged at the bottom of the lower circular ring, the cutting tool bit group is arranged in two rows on the inclined edge of the drill point, the lower circular ring and the upper circular ring are fixed through the connecting plate, the central tube is respectively fixed with the lower circular ring and the upper circular ring through a plurality of radially symmetrical lower spokes and upper spokes, and the inclined rod is obliquely arranged between the lower spokes and the upper spokes; the cutting tool bit groups are respectively arranged on two opposite surfaces of the inclined edge of the drill point, and the tool bits of each row of cutting tool bit groups are arranged at intervals along the length of the inclined edge of the drill point; the outer walls of the lower circular ring and the upper circular ring are respectively provided with a plurality of radially symmetrical supporting plates; the lower spoke and the upper spoke form an included angle in the projection direction. The cage type drill bit and the diving drill provided by the utility model have the characteristics of simple structure, reliable hole forming, reliable guiding, smooth soil discharging and the like, the vertical precision of hole forming is ensured, and the construction efficiency of the cast-in-place pile is improved.

Description

Cage type drill bit and diving drilling machine

Technical Field

The utility model belongs to the technical field of foundation construction, and particularly relates to a cage type drill bit and a diving drilling machine.

Background

As a traditional construction method for pile foundation construction, the bored pile has the advantages of high bearing capacity, no soil compaction during construction, good adaptability to various geology, simple construction, low purchase cost and the like, and is widely applied to urban building, highway and railway, bridge and tunnel construction engineering. Soft clay stratum widely distributed in the south-east coast of Bohai sea in China, and a general submersible drilling machine for foundation treatment is matched with a three-wing cage type drill bit for construction.

The three-wing cage drill bit of the prior art has the following problems: 1) Because the three obliquely arranged wing rods provided with the cutting tool bit are respectively welded with the front end of the outer wall of the central tube and the bottom of the lower guard ring of the drill bit, when the drilling process encounters unfavorable geology such as underground barriers, backfill and the like, the three wing rods are distorted and deformed, so that the verticality deviation of the hole forming is caused, and the quality of the hole forming and the construction efficiency are influenced; 2) The drill bit is used for forming holes in the cohesive soil to form mud strips and mud blocks, and the mud strips and the mud blocks are suspended around the end parts of all wing rods and the cutting tool bit under the action of injected mud, so that soil layers cannot be effectively cut and broken; 3) Because the outer circle of the cage body is relied on to protect the pore-forming wall in the drilling process of the diving drill, when encountering formations with uneven hardness, the drill bit is deformed, and pore-forming collapse shrinkage cavity is caused.

Disclosure of Invention

The utility model mainly aims to overcome the defects of the prior art, and provides a cage type drill bit and a diving drill, which have the characteristics of simple structure, reliable hole forming, reliable guiding, smooth soil discharging, good integral rigidity and the like, realize simultaneous cutting and drilling of a plurality of bits in the length direction of two bevel edges of a drill point, effectively protect walls of holes by support plates on the outer walls of a lower ring and an upper ring, improve the impact resistance of a cutting bit group in the rotary cutting process, ensure the vertical precision of the hole forming, and further improve the construction efficiency of a cast-in-place pile.

The utility model is realized by the following technical scheme:

the cage type drill bit is characterized by comprising a drill point, a lower circular ring, an upper circular ring, a central tube, a cutting bit group, a connecting plate and an inclined rod; the drill point is a triangular plate, and the bottom edge of the triangular plate is fixedly arranged at the bottom of the lower circular ring; the cutting blade head groups are respectively provided with two rows on two bevel edges of the drill point; the lower circular ring and the upper circular ring are fixed through a connecting plate; the central tube is fixed with the lower ring and the upper ring through a plurality of radially symmetrical lower spokes and upper spokes respectively; the inclined rod is obliquely arranged between the lower spoke and the upper spoke.

Further, the cutting bit groups are respectively arranged on two opposite faces of the bevel edge of the drill tip, and the respective bits of each row of cutting bit groups are arranged at intervals along the length direction of the bevel edge of the drill tip for improving the cutting strength of the cutter body.

Further, a groove is formed in the middle of the bottom edge of the drill tip, and the groove is right at the outlet of the central tube, so that slurry injection is facilitated.

Further, the outer walls of the lower circular ring and the upper circular ring are respectively provided with radially symmetrical support plates for hole forming and wall protecting.

Further, the upper spoke and the lower spoke form an included angle in the projection direction of the central tube.

A submersible drilling rig comprising a cage drill bit as claimed in any preceding claim.

Compared with the prior art, the utility model has the beneficial effects that,

1) According to the technical scheme, a mode of welding and fixing the drill point at the bottom of the lower guard ring of the existing cage type drill bit is adopted, so that the length of the central tube and the total length of the cage type drill bit are shortened, the overall rigidity of the drill bit is effectively improved, and the drilling stability is guaranteed; the cutting tool bit groups are respectively arranged on two opposite surfaces of the bevel edge of the drill point, and the tool bits of each row of cutting tool bit groups are arranged at intervals, so that the impact resistance of the cutting tool bit groups in the rotary cutting process is improved, the situation that the tool bits are cracked and fall off is avoided, the soil body cutting is stable and reliable, and the drilling and digging operation efficiency is further improved;

2) According to the technical scheme, a mode that a plurality of support guard plates are arranged on the outer walls of the upper guard ring and the lower guard ring is adopted, and the wall is effectively protected against hole forming in the rotating process of the cage type drill bit, so that the vertical precision of hole forming is ensured; meanwhile, the service lives of the upper guard ring and the lower guard ring are prolonged, and the construction efficiency is improved;

3) According to the technical scheme, the inner cavities of the upper guard ring and the lower guard ring are provided with the inclined rods, so that the soil body can be smoothly discharged when the two rows of cutting tool bit groups on the inclined edges of the drill point are used for rotary drilling, and the working efficiency is further effectively improved.

Drawings

FIG. 1 is a schematic view of the construction of a cage bit of the present utility model;

FIG. 2 is a top view of FIG. 1;

FIG. 3 is a bottom view of FIG. 1;

FIG. 4 is a cross-sectional view taken along A-A of FIG. 2;

the drilling tool comprises a 10-drill point, a 102-groove, a 11-lower circular ring, a 12-upper circular ring, a 13-central pipe, a 14-tool bit, a 15-connecting plate, a 114-lower spoke, a 124-upper spoke, a 33-supporting plate and a 44-inclined rod.

Detailed Description

The cage drill bit and the diving drill of the present utility model will be further described with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present utility model, and are not intended to limit the scope of the present utility model.

The embodiment discloses a cage type drill bit, which comprises seven parts of a drill point 10, a lower circular ring 11, an upper circular ring 12, a central tube 13, a cutting bit group, a connecting plate 15 and an inclined rod 44.

Referring to fig. 1-4, the lower ring 11 and the upper ring 12 are respectively welded firmly with the outer wall of the central tube 13 through four radially symmetrical lower spokes 114 and upper spokes 124, and the lower spokes 114 and the upper spokes 124 form an included angle of 45 ° in the axial projection direction of the central tube 13;

the lower end surface of the lower ring 11, the lower edge of the lower spoke 144 and the bottom end of the central tube 13 are arranged to be the same plane, so that when the drill tip 10 is welded at the bottom of the lower ring 11, the drill tips are completely attached to each other and flush, the welding strength among all the components is ensured, and the overall strength of the cage drill is improved and the service life of the cage drill is prolonged;

the inclined rods 44 are arranged between the lower spokes 114 and the upper spokes 124 in a clockwise rotation direction in an inclined manner, the lower ends of the inclined rods are welded at the joint of the lower spokes 114 and the outer wall of the central tube 13, and the upper ends of the inclined rods are welded at the joint of the upper spokes 124 and the upper circular ring 12, so that when the cage drill bit rotates clockwise to cut a stratum, soil is smoothly discharged from the holes by means of spaces formed between the inclined rods 44 and the central tube 13;

the length of the bottom edge of the drill tip 10 is respectively matched with the outer diameters of the lower circular ring 11 and the upper circular ring 12, and a groove 102 in the middle of the bottom edge of the drill tip is formed into a U shape or a rectangle, and because the groove is positioned at the outlet of the central tube 13, external slurry can be conveniently and smoothly sprayed and injected into a hole through the inner hole of the central tube 13;

the outer walls of the lower circular ring 11 and the upper circular ring 12 are respectively welded with a plurality of radially symmetrical support plates 33, and the outer surfaces of the support plates are provided with wear-resistant layers, so that the wear-resistant performance of the support plates is effectively improved, the walls of the holes can be effectively protected, collapse or retraction of the walls of the pile forming holes is prevented, and the pile forming quality of the cast-in-place pile is ensured.

When the cage type drill bit is used, the central tube 13 is fixedly connected with the power head of the down-the-hole drill, the power head is driven to drive the cage type drill bit to rotate clockwise, two rows of cutting tool bit groups positioned on the inclined edge of the drill point 10 drill down to cut a stratum, meanwhile, the external grouting system injects slurry through the hollow drill rod and the central tube 13, and cut soil body smoothly discharges holes in the process of simultaneously rotating each inclined rod 44 under the action of pressure slurry, so that the drilling operation of the cast-in-situ pile is finally completed.

The utility model also relates to a diving drilling machine, which comprises the cage type drill bit.

The cage type drill bit and the diving drill have the characteristics of simple structure, reliable hole forming, reliable guiding, good integral rigidity and the like, realize simultaneous cutting and drilling of each bit of two rows of cutting bit groups on the inclined edge of the drill point, effectively protect the hole forming by the support plates positioned on the outer walls of the lower ring and the upper ring, ensure the impact resistance of the cutting bit groups in the rotary cutting process, ensure the vertical precision of the hole forming and effectively improve the construction efficiency of the cast-in-place pile.

Various changes and modifications may be made to the utility model without departing from the general inventive concept, and, if the same or equivalent thereto is made, the utility model is also within the scope of the utility model.

Claims (6)

1. The cage type drill bit is characterized by comprising a drill point (10), a lower circular ring (11), an upper circular ring (12), a central tube (13), a cutting tool bit group, a connecting plate (15) and an inclined rod (44); the drill point (10) is a triangular plate, and the bottom edge of the triangular plate is fixedly arranged at the bottom of the lower circular ring (11); the cutting blade sets are respectively provided with two rows on two bevel edges of the drill point (10); the lower circular ring (11) and the upper circular ring (12) are fixed through a connecting plate (15); the central tube (13) is fixed with the lower circular ring (11) and the upper circular ring (12) through a plurality of radially symmetrical lower spokes (114) and upper spokes (124) respectively; the diagonal rods (44) are obliquely arranged between the lower spokes (114) and the upper spokes (124).

2. Cage bit according to claim 1, characterized in that the cutting bit groups are arranged on two opposite sides of the hypotenuse of the drill tip (10), respectively, and that the individual bits (14) of each row of cutting bit groups are arranged at intervals along the length of the hypotenuse of the drill tip (10) for increasing the cutting strength of the cutter body.

3. Cage drill bit according to claim 1, characterized in that the middle of the bottom edge of the drill tip (10) is provided with a groove (102) which is right at the outlet of the central tube (13) for facilitating the injection of slurry jet.

4. Cage bit according to claim 1, characterized in that the outer walls of the lower ring (11) and the upper ring (12) are provided with radially symmetrical support plates (33) for hole-forming retaining walls.

5. Cage bit according to claim 1, characterized in that the upper spokes (124) form an angle with the lower spokes (114) in the projection direction of the central tube (13).

6. A submersible drilling rig comprising a cage drill bit according to any of claims 1-5.

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