CN213234951U

CN213234951U - Drill bit of cast-in-situ bored pile

Info

Publication number: CN213234951U
Application number: CN202022007131.6U
Authority: CN
Inventors: 赵明凯; 滕森; 齐睿; 郭仁亮; 张永娟
Original assignee: Shandong University of Science and Technology
Current assignee: Shandong University of Science and Technology
Priority date: 2020-09-14
Filing date: 2020-09-14
Publication date: 2021-05-18
Anticipated expiration: 2030-09-14

Abstract

The utility model discloses a drill bit of a bored pile, which belongs to the technical field of construction equipment and is designed for solving the problems of poor guidance quality, slow rock breaking speed and low drilling efficiency of the traditional conical drill bit; the connecting part is composed of an upper horizontal ring, a horizontal connecting rod, an outer oblique connecting rod, an inner oblique connecting rod, a lower horizontal ring and a central vertical rod; two ends of the horizontal connecting rod are respectively welded on the connecting part and the upper horizontal ring, the bottom end of the connecting part is welded with a central vertical rod, and the bottom of the central vertical rod is in threaded connection with a central drill point; the upper horizontal ring and the lower horizontal ring are arranged in parallel, an outer oblique connecting rod is welded between the upper horizontal ring and the lower horizontal ring, and drilling teeth a are arranged on the rods at equal intervals; the top of the inner oblique connecting rod is welded on the central vertical rod, the bottom of the inner oblique connecting rod is welded on the lower horizontal ring, and the rods are provided with drill teeth b at equal intervals; the periphery of the lower horizontal ring is provided with obliquely downward drilling teeth c at equal intervals, and the bottom of the lower horizontal ring is provided with a ring lower drilling tip. The utility model discloses possess that the guidance quality is good, arrange the sediment convenient, broken rock fast, advantage efficient of drilling, the engineering practicality is strong.

Description

Drill bit of cast-in-situ bored pile

Technical Field

The utility model relates to a construction equipment and instrument technical field especially relate to drilling bored concrete pile drill bit.

Background

The cast-in-situ bored pile is a foundation structure widely used in the current engineering construction, has simple and convenient construction, large bearing capacity and strong applicability, and can be applied to various foundation forms.

At present, China is in the rapid development period of urbanization, and many cities need to reform old buildings, the old buildings are usually reinforced by cement soil when being built, piles need to be added in a stratum reinforcing area during the reforming process, and the existing drill bit is difficult to circularly grind and drill the stratum reinforced by the cement soil; meanwhile, the conical drill bit has poor guiding performance, cannot ensure the verticality of formed holes, is slow in drilling speed after entering a rock, is easy to jump when meeting a drill bit on a hard rock stratum and a rock stratum with a slope, and even cannot effectively drill, so that the drilling efficiency is low, the drilling time is long, and the economical efficiency is poor.

Therefore, in order to solve the problems, a large amount of data search, field investigation and related experiments are conducted to research, and the novel drill bit for the bored pile has the advantages of being good in guidance performance, high in hole forming verticality, convenient to remove slag, high in rock breaking speed and high in drilling efficiency, and has strong engineering practicability.

Disclosure of Invention

The utility model discloses to the problem that exists among the prior art, provide drilling bored concrete pile drill bit, can solve traditional conical bit guidance quality effectively poor, broken rock speed is slow, problem that drilling efficiency is low, is applicable to building pile foundation engineering technical field, and simple structure, convenient operation, engineering practicality are strong.

The utility model adopts the technical proposal that: the drilling bored concrete pile drill bit, it is made up of connecting portion, upper horizontal ring, horizontal brace rod, external oblique brace rod, internal oblique brace rod, lower horizontal ring, central montant; the bottom of the connecting part is welded with a central vertical rod, and the outer side of the connecting part is welded with a horizontal connecting rod; the upper horizontal ring is internally welded with a horizontal connecting rod, and the bottom of the upper horizontal ring is welded with an external oblique connecting rod; the horizontal connecting rod plays a role in connection, and two ends of the horizontal connecting rod are respectively welded on the connecting part and the upper horizontal ring; the top of the outer oblique connecting rod is welded on the upper horizontal ring, the bottom of the outer oblique connecting rod is welded on the lower horizontal ring, and the drilling teeth a are arranged on the rod at equal intervals; the top of the inner oblique connecting rod is welded on the central vertical rod, the position of the central vertical rod is fixed, the bottom of the inner oblique connecting rod is welded on the lower horizontal ring, and the drilling teeth b are arranged on the rod at equal intervals; the lower horizontal ring is parallel to the upper horizontal ring in space, the lower horizontal ring and the upper horizontal ring are connected through an outer oblique connecting rod, oblique downward drilling teeth c are arranged on the periphery of the lower horizontal ring at equal intervals, and a drill bit is arranged at the lower end of the welding connection point of the outer oblique connecting rod, the inner oblique connecting rod and the lower horizontal ring; the top end of the central vertical rod is welded on the connecting part, and the bottom end of the central vertical rod is in threaded connection with the central drill point.

The utility model discloses a construction application method and theory of operation are: during construction, a central drill point and a lower annular drill point firstly drill a rock stratum to drill a hole and an annular groove which take the hole as the center of a circle, and the hole and the annular groove play a role in guiding and positioning the drilling direction of the drill bit, so that the slipping phenomenon of the drill bit during drilling is avoided, and the verticality of formed holes is ensured; when the drill bit continues to drill, the drill teeth c on the lower horizontal ring firstly cut the edge of the groove, and the drill teeth c can cut the rock stratum faster as the annular groove generated before breaks the stress distribution of the rock stratum; then as the drill bit continues to drill, tooth a and tooth b begin cutting, which in turn makes it easier for tooth a and tooth b to cut the formation due to the cutting action prior to tooth c.

The utility model has the advantages that: the drill bit of the cast-in-situ bored pile firstly drills a rock stratum by the central drill point and the lower drill point, so that the positioning effect is achieved, the drilling process has good guidance, and the verticality of formed holes is ensured; and meanwhile, an annular groove is formed, so that the stress distribution of a rock stratum is broken, the subsequent cutting of the drill teeth is facilitated, the abrasion of the drill teeth is reduced, the rock breaking speed is accelerated, and the drilling efficiency is improved.

The drill bit for the cast-in-situ bored pile is characterized in that the outer oblique connecting rod and the inner oblique connecting rod are connected to form a V-shaped structure, when the drill bit works, the V-shaped structure is cut sequentially from a sharp corner to a tail end by taking a sharp corner position of the V-shaped structure as a starting point, so that the drill teeth a and the drill teeth b are cut in layers, the condition that all the drill teeth act on a complete rock stratum simultaneously is avoided, the stress in the drilling process is reduced, the drilling is easier, and the cutting difficulty is reduced.

The cast-in-situ bored pile drill bit is most easily damaged in the drilling process of the drill bit, the drill bit is connected with the drill rod through threads and can be replaced when the center drill bit is damaged, the positioning effect is guaranteed, and meanwhile the service life of the whole drill bit is prolonged.

The drill bit for the cast-in-situ bored pile has the advantages that the upper horizontal ring and the lower horizontal ring are not sealed, so that rocks can be cut smoothly, rock debris can be discharged from the inside of the drill bit along a drill rod through mud buoyancy, and slag discharging is convenient.

Drawings

Fig. 1 is a schematic view of the overall structure of a cast-in-situ bored pile drill of the present invention;

fig. 2 is a side view of a bored pile drill of the present invention;

fig. 3 is a top view of the cast-in-situ bored pile drill of the present invention;

fig. 4 is a bottom view of the cast-in-situ bored pile drill of the present invention.

Illustration of the drawings: 1-a connecting part; 2-upper horizontal ring; 3-a horizontal connecting rod; 4-an outer oblique connecting rod; 5-an inner oblique connecting rod; 6-lower horizontal ring; 7-a central vertical bar; 41-drill tooth a; 51-drill tooth b; 61-drill tooth c; 62-drilling tip under the ring; 71-center drill point.

Detailed Description

The following description of the present invention will be made with reference to the accompanying drawings.

The drilling bored concrete pile drill bit, it is by the connecting portion 1, go up the horizontal ring 2, the horizontal brace rod 3, the outer oblique brace rod 4, the inner oblique brace rod 5, the horizontal ring 6 of lower level, the central montant 7 makes up; the bottom of the connecting part 1 is welded with a central vertical rod 7, and the outer side of the connecting part is welded with a horizontal connecting rod 3; the upper horizontal ring 2 is internally welded with a horizontal connecting rod 3, and the bottom of the upper horizontal ring is welded with an external oblique connecting rod 4; the horizontal connecting rod 3 plays a role in connection, and two ends of the horizontal connecting rod are respectively welded on the connecting part 1 and the upper horizontal ring 2; the top of the outer oblique connecting rod 4 is welded on the upper horizontal ring 2, the bottom of the outer oblique connecting rod is welded on the lower horizontal ring 6, and the rods are provided with drill teeth a41 at equal intervals; the top of the inner oblique connecting rod 5 is welded on the central vertical rod 7 and used for fixing the position of the central vertical rod 7, the bottom of the inner oblique connecting rod is welded on the lower horizontal ring 6, and the rods are provided with drill teeth b51 at equal intervals; the lower horizontal ring 6 is parallel to the upper horizontal ring 2 in space, the lower horizontal ring and the upper horizontal ring are connected through an outer oblique connecting rod 4, oblique downward drilling teeth c61 are arranged on the periphery of the lower horizontal ring 6 at equal intervals, and a ring lower drill point 62 is arranged at the lower end of the welding connection point of the outer oblique connecting rod 4, the inner oblique connecting rod 5 and the lower horizontal ring 6; the top end of the central vertical rod 7 is welded on the connecting part 1, and the bottom end is in threaded connection with the central drill point 71.

During construction, the central drill point 71 and the lower annular drill point 62 firstly drill a rock stratum to drill a hole and an annular groove which take the hole as the center of a circle, and the hole and the annular groove play a role in guiding and positioning the drilling direction of the drill bit, so that the slipping phenomenon of the drill bit during drilling is avoided, and the verticality of formed holes is ensured; when the drill bit continues to drill, the drill teeth c61 on the lower horizontal ring 6 firstly cut the edge of the groove, and the drill teeth c61 can cut the rock stratum faster as the annular groove generated before breaks the stress distribution of the rock stratum; as the bit continues to drill, tooth a41 and tooth b51 begin cutting, which in the same way makes it easier for tooth a41 and tooth b51 to cut the formation due to the cutting action prior to tooth c 61.

Claims

1. The drill bit for the cast-in-situ bored pile is characterized by consisting of a connecting part, an upper horizontal ring, a horizontal connecting rod, an outer oblique connecting rod, an inner oblique connecting rod, a lower horizontal ring and a central vertical rod; the bottom of the connecting part is welded with a central vertical rod, and the outer side of the connecting part is welded with a horizontal connecting rod; the upper horizontal ring is internally welded with a horizontal connecting rod, and the bottom of the upper horizontal ring is welded with an external oblique connecting rod; two ends of the horizontal connecting rod are respectively welded on the connecting part and the upper horizontal ring; the top of the outer oblique connecting rod is welded on the upper horizontal ring, the bottom of the outer oblique connecting rod is welded on the lower horizontal ring, and the drilling teeth a are arranged on the rod at equal intervals; the top of the inner oblique connecting rod is welded on the central vertical rod, the bottom of the inner oblique connecting rod is welded on the lower horizontal ring, and the drilling teeth b are arranged on the rod at equal intervals; the lower horizontal ring is parallel to the upper horizontal ring in space, the lower horizontal ring and the upper horizontal ring are connected through an outer oblique connecting rod, oblique downward drilling teeth c are arranged on the periphery of the lower horizontal ring at equal intervals, and a drill bit is arranged at the lower end of the welding connection point of the outer oblique connecting rod, the inner oblique connecting rod and the lower horizontal ring; the top end of the central vertical rod is welded on the connecting part, and the bottom end of the central vertical rod is in threaded connection with the central drill point.