CN211448510U - Reverse circulation drilling device - Google Patents

Abstract

The utility model provides a reverse circulation drilling device, comprising a drill frame and a drill pipe connected to the drill frame, the drill pipe is connected with a working platform through the drill frame, and the reverse circulation drilling device further comprises a mud bridle communicated with the drill pipe , the mud bridle is connected with the mud pump through the pipeline, the drill pipe includes the outer drill pipe and the inner drill pipe that are coaxially sleeved, and the outer drill pipe and the inner drill pipe can rotate independently; one end of the outer drill pipe is connected with a first drill pipe. The other end of the drilling rig is connected with a drill bit, one end of the inner drill pipe is connected with a mud bridle and a second drilling rig, and the other end is connected with an enlarged cavity; the first drilling rig and the second drilling rig are connected with the working platform, and the enlarged cavity is arranged in the There is a crushing device. The utility model adopts a double-layer drill pipe, the bearing is connected, the rotation of the inner and outer drill pipes does not affect each other, the inner layer drill pipe rotates at a high speed, and is not affected by the rotation speed of the outer layer drill pipe. Grind evenly to avoid blockage of drill pipe due to large slag during drilling.

Description

A reverse circulation drilling device

technical field

The utility model belongs to the technical field of bored pile drilling, in particular to a reverse circulation drilling device.

Background technique

Bored pile refers to drilling into the soil with a drilling machine and other machinery, breaking the soil and excavating the slag to form a hole, and then placing a steel skeleton in the hole, and then pouring concrete to form the pile. Bored piles are characterized by simple construction equipment and easy operation. They are suitable for a variety of sandy soils, cohesive soils, and also for soil and rock layers such as gravel and pebbles. Therefore, bored piles are widely used in engineering.

At present, the commonly used drilling methods in my country mainly include positive circulation hole forming and reverse circulation hole forming. Among them, reverse circulation hole forming is that mud flows into the hole from the annular gap between the drill pipe and the hole wall to cool the drill bit and carry the sediment from the hole. A drilling process in which the inner cavity of the drill pipe returns to the ground. The reverse circulation has a large upward return speed, which can improve the slag discharge capacity and reduce the chance of the drilling slag being repeatedly broken at the bottom of the hole. However, if the particle size of the drill slag exceeds the inner diameter of the drill pipe, it is easy to block the pipeline, which will cause delay in the construction period and seriously affect the construction efficiency. The existing utility model adopts a multi-stage drill pipe. When cutting the soil, filter screens are arranged between the drill pipes, and the apertures are 18mm, 15mm, and 10mm respectively.

The existing utility model has the following problems: 1. During the drilling process of the drill pipe, the rotation speed is relatively slow, and the serrated protrusions cannot effectively cut the soil; 2. The inner diameter of the reverse circulation drilling drill pipe is small, and the serrated protrusions are more likely to cause pipeline blockage. 3. When the particle size exceeding 18mm is not cut by the serrated protrusions, the filter screen will become a barrier to block the pipeline.

SUMMARY OF THE INVENTION

In view of the above-mentioned deficiencies and defects of the prior art, the purpose of the present invention is to provide a reverse circulation drilling device, which solves the technical problem that drilling slag easily blocks the pipeline in the prior art.

In order to achieve the above purpose, the present application adopts the following technical solutions to achieve: a reverse circulation drilling device, comprising a drill frame and a drill pipe connected to the drill frame, the drill pipe is connected to the working platform through the drill frame, and the The reverse circulation drilling device also includes a mud bridle communicated with the drill pipe, the mud bridle is connected with the mud pump through a pipeline, and the drill pipe includes an outer layer drill pipe and an inner layer drill pipe that are coaxially sleeved, so The outer drill pipe and the inner drill pipe can be rotated independently;

One end of the outer drill pipe is connected with a first drilling rig, the other end is connected with a drill bit, one end of the inner drill pipe is connected with a mud bridle and a second drilling rig, and the other end is connected with an enlarged cavity;

The first drilling rig and the second drilling rig are installed on the working platform, and a crushing device is arranged in the enlarged cavity.

The utility model also has the following technical features:

A bearing is arranged between the outer drill pipe and the inner drill pipe, the outer drill pipe is connected with the outer ring of the bearing, and the inner drill pipe is connected with the inner ring of the bearing.

The enlarged cavity is a hollow structure, and the diameter of the enlarged cavity is larger than the diameter of the outer drill pipe. The pulverizing device is a plurality of cutters arranged along the circumference of the inner wall of the enlarged cavity. The inner wall of the body is vertical, and there are at least 6 knives in each layer, and there are at least two layers.

The drill pipe can be arranged in multiple sections and connected by flanges.

Compared with the prior art, the present utility model has the following beneficial technical effects:

(I) The utility model adopts a double-layer drill pipe, the bearing is connected, the rotation of the inner and outer drill pipes does not affect each other, the inner layer drill pipe rotates at a high speed, and is not affected by the rotation speed of the outer layer drill pipe. The drill slag is ground evenly to avoid blockage of the drill pipe due to large pieces of drill slag during the drilling process.

(II) The inner diameter of the drill pipe of the utility model is small, and the use of the enlarged cavity can avoid occupying the inner channel and causing the pipeline to be blocked. The tool and the enlarged cavity are connected by bolts, and the tool can be replaced according to the grinding condition of the tool, which is flexible and convenient.

(III) The utility model uses the flange to connect the drill pipe more in line with the needs of the actual project, the drill pipe can be extended according to the needs of the project, and the construction plan is more flexible; the inner layer drill pipe is fixed with the bearing, the outer layer drill pipe is free to move, and the inner and outer drill pipes It can be installed and connected separately, and the sealing is complete.

Description of drawings

Figure 1 is a schematic diagram of the overall structure of the present invention.

Figure 2 is a bearing connection diagram.

Figure 3 Drill pipe connection diagram.

Figure 4 is a detailed schematic diagram of the drill pipe connection.

FIG. 5 is an enlarged view of the lower part.

Figure 6 is a schematic view of the A-A cross-sectional structure.

Figure 7 is an enlarged view of the tool.

The meaning of each label in the figure is: 1-drilling frame, 2-drill pipe, 3-working platform, 4-mud bridle, 5-pipeline, 6-mud pump, 7-first drilling rig, 8-drill bit, 9-th Two drilling rigs, 10-expanding cavity, 11-crushing device, 12-cutting tool, 13-mud pool, 14-protecting cylinder, 15-drilling hole.

201-outer drill pipe, 202-inner drill pipe, 203-bearing, 204-flange.

The specific content of the present utility model will be further explained in detail below in conjunction with the accompanying drawings and embodiments.

Detailed ways

Specific embodiments of the present utility model are given below. It should be noted that the present utility model is not limited to the following specific embodiments, and all equivalent transformations made on the basis of the technical solutions of the present application all fall into the protection scope of the present utility model.

Example 1:

Following the above technical solutions, as shown in Figures 1 to 7, the present embodiment provides a reverse circulation drilling device, comprising a drill frame 1 and a drill rod 2 connected to the drill frame 1, and the drill rod 2 passes through The drilling frame 1 is connected to the working platform 2, and the reverse circulation drilling device also includes a mud bridle 4 that communicates with the drill pipe 2. The mud bridle 4 is connected to a mud pump 6 through a pipeline 5, and the mud bridle 4 is a hollow structure. , the mud collar 4 communicates with the inner drill pipe 202, the drill pipe 2 includes the outer drill pipe 201 and the inner drill pipe 202 which are coaxially sleeved, and the outer drill pipe 201 and the inner drill pipe 202 can be rotated independently;

One end of the outer drill pipe 201 is connected with the first drilling rig 7, the other end is connected with the drill bit 8, one end of the inner drill pipe 202 is connected with the mud bridle 4 and the second drilling rig 9, and the other end is connected with the enlarged cavity 10; The power of the inner drill pipe 202 is provided by the second drilling rig 9, and the power of the outer drill pipe 201 is provided by the first drilling rig 7

The first drilling rig and the second drilling rig are installed on the working platform, and a crushing device 11 is arranged in the enlarged cavity 10 . When the device is in use, a mud pool 13 needs to be arranged to store mud, and the mud pool 13 and the borehole form a fluid circulation system. The mud pump 6 refers to a machine that extracts drilling slag from the mud bridle 4 and discharges it to the mud pool 13 during the drilling process.

As a preference of this embodiment, a bearing 203 is arranged between the outer drill pipe 201 and the inner drill pipe 202, the outer drill pipe 201 is connected to the outer ring of the bearing 203, and the inner drill pipe 202 is connected to the bearing 203 inner ring connection. A bearing 203 is arranged between the inner drill pipe 202 and the outer drill pipe 201 at intervals of 1 to 1.5 m. The inner drill pipe 202 and the outer drill pipe 201 work independently and do not interfere with each other. The outer wall of the inner drill pipe 202 and the bearing The inner ring of 203 is fixed, the inner wall of the outer drill pipe 201 is fixed with the outer ring of the bearing 203, and the inner and outer drill pipes can be installed separately.

As a preference of this embodiment, the expanding cavity 10 is a hollow structure, the diameter of the expanding cavity 10 is larger than the diameter of the outer drill pipe 201 , and the crushing device 11 is located along the inner wall of the expanding cavity 10 . A plurality of cutters 12 are arranged in the circumferential direction, and the cutters 12 are perpendicular to the inner wall of the enlarged cavity 10 , each layer has at least 6 cutters, and there are at least two layers. During operation, the mud enters the enlarged cavity 10 on the inner drill pipe 202 through the drill bit 8. On the premise that the second drilling rig 9 provides power, the inner drill pipe 202 drives the cutter 12 on the inner wall of the enlarged cavity 10 to rotate at a high speed, grinding and grinding. Crushed soil. The more knives 12 are set, the better the effect of grinding the soil.

As a preference of this embodiment, the drill pipe 2 can be provided with multiple sections, which are connected by flanges 204 . In specific use, multi-section drill pipes can be used according to the actual project.

The drill rod 2 is fixed on the working platform 3 through the drilling frame 1 , and the first drilling rig 7 and the second drilling rig 9 are fixed on the working platform 3 . The inner drill pipe 202 is installed on the power output shaft of the second drilling rig 9. The second drilling rig 9 provides power for the rotation and movement of the inner drill pipe 202 and the enlarged cavity 10, and drives the cutter 12 to rotate at high speed to cut the soil and make the The inner drill pipe 202 transports drilling slag; the outer drill pipe 201 is installed on the power output shaft of the first drilling rig 7, and the first drilling rig 7 provides power for the outer drill pipe 201 and the drill bit 8, so that the drill bit 8 drills and cuts the soil. .

When the device of this embodiment is used, the inner drill pipe 202 and the outer drill pipe 201 are first assembled. The lower end of the inner drill pipe 202 is connected to the enlarged cavity 10, and the upper end is connected to the mud bridle 4; the assembled drill pipe 2 is fixed on the working platform 3 through the drilling frame 1, and the mud bridle 1 is connected to the mud pump 6 through the pipeline 5, and the mud pump 6 It is connected to the mud pool 13 through the pipeline 5 .

The working process of this device is as follows:

The mud in the mud pool 13 flows into the drilled hole along the annular ring between the outer drill pipe 201 and the hole wall through the channel opened on the casing 14. Under the power provided by the first drilling rig 7, the outer drill pipe 201 drives the drill bit 8 Drilling, the mud carrying drilling slag enters the enlarged cavity 10 on the inner drill pipe 202 through the drill bit 8. Under the premise that the second drilling rig 9 provides power, the inner drill pipe 202 drives the cutter 12 on the inner wall of the enlarged cavity 10 to perform high-speed operation. Rotate and grind the soil, the ground drill slag enters the mud bridle 4, and then the mud and drill slag are pumped out into the mud pool 13 under the pulling force of the mud pump 6 for sedimentation, and then the mud is recycled.

Claims (4)

1. The reverse circulation drilling device comprises a drill frame (1) and a drill rod (2) connected to the drill frame (1), wherein the drill rod (2) is connected with a working platform (3) through the drill frame (1), the reverse circulation drilling device further comprises a mud cage (4) communicated with the drill rod (2), the mud cage (4) is connected with a mud pump (6) through a pipeline (5), the reverse circulation drilling device is characterized in that the drill rod (2) comprises an outer drill rod (201) and an inner drill rod (202) which are coaxially sleeved, and the outer drill rod (201) and the inner drill rod (202) can independently rotate;

one end of the outer layer drill rod (201) is connected with a first drilling machine (7), the other end of the outer layer drill rod is connected with a drill bit (8), one end of the inner layer drill rod (202) is connected with a slurry halter (4) and a second drilling machine (9), and the other end of the inner layer drill rod is connected with an expansion cavity (10);

the first drilling machine (7) and the second drilling machine (9) are installed on the working platform (3), and the crushing device (11) is arranged in the enlarged cavity (10).

2. The reverse circulation drilling device as claimed in claim 1, characterized in that a bearing (203) is arranged between the outer drill rod (201) and the inner drill rod (202), the outer drill rod (201) is connected with the outer ring of the bearing (203), and the inner drill rod (202) is connected with the inner ring of the bearing (203).

3. The reverse circulation drilling device as claimed in claim 1, wherein the enlarged cavity (10) is a hollow structure, the diameter of the enlarged cavity (10) is larger than that of the outer drill rod (201), the crushing device (11) is a plurality of cutters (12) arranged along the circumferential direction of the inner wall of the enlarged cavity (10), and the cutters (12) are perpendicular to the inner wall of the enlarged cavity (10).

4. A reverse circulation drilling apparatus according to claim 1, wherein the drill rods (2) are provided in a plurality of sections, connected by flanges (204).

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