阅读说明：本技术 一种伸缩钻杆及其使用方法 (Telescopic drill rod and using method thereof ) 是由 庄金 敖文 凌国滨 庄子鸣 于 2020-07-21 设计创作，主要内容包括：本发明公开了一种伸缩钻杆及其使用方法,该伸缩钻杆包括外杆和设置在外杆内的内杆,外杆包括外管和固定设置在外管内壁上部的卡接件,内杆包括内管,内管的外壁沿长度方向开设有与卡接件滑动配合的凹槽单元；该使用方法包括以下步骤：一、伸缩钻杆的安装；二、初步钻进；三、提升内杆；四、再次钻进；五、初步提升伸缩钻杆并注浆；六、内杆回缩；七、再次提升伸缩钻杆并注浆。本发明通过设置凹槽单元与卡接件配合,使内杆和外杆可拆卸的连接,结构简单,极大的减小了伸缩钻杆自身重量,便于运输装卸,无需电气控制装置控制伸缩钻杆的伸缩,控制过程简单明了,减少控制对象的数量,操作便易,便于推广使用。(The invention discloses a telescopic drill rod and a use method thereof, wherein the telescopic drill rod comprises an outer rod and an inner rod arranged in the outer rod, the outer rod comprises an outer pipe and a clamping piece fixedly arranged on the upper part of the inner wall of the outer pipe, the inner rod comprises an inner pipe, and the outer wall of the inner pipe is provided with a groove unit in sliding fit with the clamping piece along the length direction; the using method comprises the following steps: firstly, mounting a telescopic drill rod; secondly, performing primary drilling; thirdly, lifting the inner rod; fourthly, drilling again; fifthly, primarily lifting the telescopic drill rod and grouting; sixthly, retracting the inner rod; and seventhly, lifting the telescopic drill rod again and grouting. The telescopic drill rod has the advantages that the groove units are arranged to be matched with the clamping pieces, so that the inner rod and the outer rod are detachably connected, the structure is simple, the self weight of the telescopic drill rod is greatly reduced, the telescopic drill rod is convenient to transport, assemble and disassemble, an electric control device is not needed for controlling the telescopic drill rod to stretch, the control process is simple and clear, the number of control objects is reduced, the operation is convenient and easy, and the popularization and the use are convenient.)

1. A telescopic drill rod is characterized in that: the pile driver comprises an outer rod and an inner rod which is arranged in the outer rod and is in sliding fit with the outer rod, wherein the outer rod comprises an outer tube (1) and a clamping piece (2) fixedly arranged on the upper portion of the inner wall of the outer tube (1), the inner rod comprises an inner tube (3) and an installation tube (4) which is arranged at the upper end of the inner tube (3) and is used for being matched with a power device of a pile driver, and a groove unit in sliding fit with the clamping piece (2) is formed in the outer wall of the inner tube (3) along the length direction;

the groove unit comprises a first groove (6) which is formed along the length direction of the outer wall of the inner pipe (3), one end of the first groove (6) close to the installation pipe (4) is expanded in an unidirectional mode to form a second groove (5), one end of the first groove (6) far away from the installation pipe (4) is expanded in an unidirectional mode to form a third groove (7), the expanding directions of the second groove (5) and the third groove (7) are the same, a dislocation groove (8) which is dislocated with the first groove (6) and used for allowing the clamping piece (2) to enter the third groove (7) is formed in the outer wall of the inner pipe (3), the width of the clamping piece (2) is smaller than or equal to that of the first groove (6), and the width of the dislocation groove (8) is larger than or equal to that of the clamping piece (2) and smaller than that of the third groove (7).

2. A telescopic drill rod according to claim 1, characterized in that: dislocation groove (8) are the dovetail groove, the tip in dovetail groove is close to third recess (7) and sets up, the width more than or equal to the width of joint spare (2) of the width of dovetail groove tip and be less than the width of third recess (7).

3. A telescopic drill rod according to claim 1, characterized in that: the outer diameter of the mounting pipe (4) is larger than the inner diameter of the outer pipe (1) and is smaller than or equal to the outer diameter of the outer pipe (1).

4. A telescopic drill rod according to claim 1, characterized in that: the joint spare (2) are fan ring shape joint spare, the quantity of fan ring shape joint spare is a plurality of, and is a plurality of fan ring shape joint spare is laid along the inner wall circumference of outer tube (1), the quantity of recess unit is a plurality of, the quantity of recess unit with the same and the one-to-one of quantity of joint spare.

5. A telescopic drill rod according to claim 1, characterized in that: the depth of the second groove (5), the depth of the third groove (7), the depth of the first groove (6) and the depth of the dislocation groove (8) are the same.

6. A telescopic drill rod according to claim 1, characterized in that: the lower end of the outer pipe (1) is provided with a drill bit (9), and the drill bit (9) is provided with a slurry outlet communicated with the inside of the inner pipe (3).

7. A method of using the telescopic drill rod of claim 1, wherein: the method comprises the following steps:

step one, installation of a telescopic drill rod:

step 101, connecting an installation pipe (4) with the power device of the pile machine, controlling the power device to move and driving an inner pipe (3) to rotate, aligning a dislocation groove (8) of the inner pipe (3) with a clamping piece (2) of an outer pipe (1), and driving the inner pipe (3) to descend by the power device to enable the clamping piece (2) to pass through the dislocation groove (8) and completely enter a third groove (7);

102, controlling the power device to drive the inner pipe (3) to rotate until the clamping piece (2) is completely positioned at the intersection of the third groove (7) and the first groove (6), and then driving the inner pipe (3) to descend by the power device until the top of the clamping piece (2) abuts against the top of the second groove (5), so that the clamping piece (2) completely enters the second groove (5) after passing through the first groove (6);

103, controlling the power device to drive the inner pipe (3) to rotate reversely until the clamping piece (2) moves out of the intersection of the second groove (5) and the first groove (6) horizontally, so that the clamping piece (2) cannot move downwards under the limitation of the bottom of the second groove (5), and completing the installation of the telescopic drill rod;

step two, preliminary drilling: keeping the retraction state of the telescopic drill rod, moving the pile machine to the side of a pile position to be constructed and aligning the telescopic drill rod to the pile position; the power device drives the telescopic drill rod to reversely turn to drill downwards until the distance between the top of the power device and the ground is 0.5-1 m, and at the moment, the drilling is stopped;

step three, lifting the inner rod:

301, controlling the power device to drive the inner pipe (3) to rotate forwards until the clamping piece (2) is completely positioned at the intersection of the second groove (5) and the first groove (6);

step 302, controlling the power device to drive the inner pipe (3) to lift until the bottom of the clamping piece (2) abuts against the bottom of the third groove (7), and completing the lifting of the inner rod;

step four, drilling again: keeping the extension state of the telescopic drill rod, controlling the power device to drive the inner pipe (3) to reversely rotate to drill downwards, wherein in the process, the clamping piece (2) horizontally moves out of the intersection of the third groove (7) and the first groove (6), and then the clamping piece (2) is abutted against the top of the third groove (7) under the action of the reverse downward force of the inner pipe (3) and drives the outer pipe (1) to reversely rotate downwards to drill again; drilling until the depth of the designed hole is reached;

step five, primarily lifting the telescopic drill rod and grouting: keeping the extension state of the telescopic drill rod, controlling the power device to drive the inner pipe (3) to rotate forwards and lift upwards, wherein in the process, the clamping piece (2) completely enters the intersection of the third groove (7) and the first groove (6), then the clamping piece (2) is abutted to the bottom of the third groove (7) under the action of the upward rotating force of the inner pipe (3) and drives the outer pipe (1) to rotate forwards and lift upwards until the power device lifts to a height threshold value, and in the process of rotating forwards and lifting the telescopic drill rod upwards, the inner pipe (3) is connected with grouting equipment to synchronously carry out concrete pouring construction to form a first pile section;

step six, retracting the inner rod: stopping concrete pouring construction; controlling the power device to drive the inner pipe (3) to descend until the top of the clamping piece (2) abuts against the top of the second groove (5), so that the clamping piece (2) completely enters the second groove (5) after passing through the first groove (6), and completing retraction of the telescopic drill rod;

step seven, lifting the telescopic drill rod again and grouting: keeping the retraction state of the telescopic drill rod, controlling the power device to drive the inner pipe (3) to reversely rotate and upwards lift, wherein in the process, the clamping piece (2) horizontally moves out of the intersection of the second groove (5) and the first groove (6), then the clamping piece (2) is abutted to the bottom of the second groove (5) under the action of the reverse upward force of the inner pipe (3), and drives the outer pipe (1) to reversely rotate and upwards lift until the telescopic drill rod is lifted out of the formed drill hole; and in the process that the telescopic drill rod is reversely and upwards lifted, the inner pipe (3) is connected with grouting equipment to synchronously carry out concrete pouring construction, and a second pile section is formed in the construction.

Technical Field

The invention belongs to the technical field of foundation construction, and particularly relates to a telescopic drill rod and a using method thereof.

Background

The existing long screw pile-forming pile machine needs to drill a plurality of deep holes and must be matched with a pile machine tower frame with a plurality of heights. The depth of the drilled hole is usually more than 20 meters, the deepest depth is even more than 30 meters, so that a pile machine tower frame with the corresponding height needs to be configured, the height of the pile machine tower frame is increased, a large amount of steel is wasted, the cost is increased, the size of a long screw pile forming hole pile machine is large, and the moving cost is increased. Therefore, the telescopic drill rod is arranged on the long-screw pile-driving pore-forming pile machine, the required height of the tower frame of the pile machine can be greatly reduced, but the existing telescopic drill rod is complex in structure and not easy to assemble, install and maintain, the construction cost of the tower frame of the pile machine is reduced, but the maintenance cost of the drill rod is invisibly increased, and therefore the telescopic drill rod which is simple in structure, convenient to install and convenient to maintain is needed.

Disclosure of Invention

The invention aims to solve the technical problem that in order to overcome the defects in the prior art, the telescopic drill rod is provided, the inner rod and the outer rod are detachably connected by arranging the groove units to be matched with the clamping pieces, the structure is simple, the self weight of the telescopic drill rod is greatly reduced, the telescopic drill rod is convenient to transport, assemble and disassemble, the redundant electric control devices are not required to be controlled to control the telescopic drill rod to stretch, the control process is simple and clear, the number of control objects is reduced, the operation is convenient and easy, and the telescopic drill rod is convenient to popularize and use.

In order to solve the technical problems, the invention adopts the technical scheme that: a telescopic drill rod is characterized in that: the pile driver comprises an outer rod and an inner rod which is arranged in the outer rod and is in sliding fit with the outer rod, wherein the outer rod comprises an outer pipe and a clamping piece fixedly arranged on the upper part of the inner wall of the outer pipe;

the groove unit comprises a first groove which is formed along the length direction of the outer wall of the inner pipe, one end of the first groove, which is close to the installation pipe, is subjected to unidirectional diameter expansion to form a second groove, one end of the first groove, which is far away from the installation pipe, is subjected to unidirectional diameter expansion to form a third groove, the diameter expansion directions of the second groove and the third groove are the same, a dislocation groove which is dislocated with the first groove and is used for allowing the clamping piece to enter the third groove is formed in the outer wall of the inner pipe, the width of the clamping piece is less than or equal to that of the first groove, and the width of the dislocation groove is greater than or equal to that of the.

The telescopic drill rod is characterized in that: the dislocation groove is the dovetail groove, the tip in dovetail groove is close to the third recess setting, the width more than or equal to the width of joint spare of the width of dovetail groove tip and be less than the width of third recess.

The telescopic drill rod is characterized in that: the outer diameter of the mounting pipe is larger than the inner diameter of the outer pipe and is smaller than or equal to the outer diameter of the outer pipe.

The telescopic drill rod is characterized in that: the joint spare is fan ring shape joint spare, the quantity of fan ring shape joint spare is a plurality of, and a plurality of fan ring shape joint spare is laid along the inner wall circumference of outer tube, the quantity of recess unit is a plurality of, the quantity of recess unit with the same and the one-to-one correspondence of the quantity of joint spare.

The telescopic drill rod is characterized in that: the depth of the second groove, the depth of the third groove, the depth of the first groove and the depth of the dislocation groove are the same.

The telescopic drill rod is characterized in that: the lower end of the outer pipe is provided with a drill bit, and the drill bit is provided with a slurry outlet communicated with the inside of the inner pipe.

Meanwhile, the invention also discloses a using method of the telescopic drill rod, which has the advantages of simple steps, reasonable design and simple control process, and is characterized by comprising the following steps:

step one, installation of a telescopic drill rod:

step 101, connecting the installation pipe with the power device of the pile machine, controlling the power device to move and driving the inner pipe to rotate, aligning the dislocation groove of the inner pipe with the clamping piece of the outer pipe, and driving the inner pipe to descend by the power device to enable the clamping piece to pass through the dislocation groove and completely enter the third groove;

step 102, controlling the power device to drive the inner pipe to rotate until the clamping piece is completely positioned at the intersection of the third groove and the first groove, and then driving the inner pipe to descend by the power device until the top of the clamping piece abuts against the top of the second groove, so that the clamping piece completely enters the second groove after passing through the first groove;

103, controlling the power device to drive the inner pipe to rotate reversely until the clamping piece moves out of the intersection of the second groove and the first groove horizontally, so that the clamping piece cannot move downwards under the limitation of the bottom of the second groove, and completing the installation of the telescopic drill rod;

step two, preliminary drilling: keeping the retraction state of the telescopic drill rod, moving the pile machine to the side of a pile position to be constructed and aligning the telescopic drill rod to the pile position; the power device drives the telescopic drill rod to reversely turn to drill downwards until the distance between the top of the power device and the ground is 0.5-1 m, and at the moment, the drilling is stopped;

step three, lifting the inner rod:

301, controlling the power device to drive the inner pipe to rotate forwards until the clamping piece is completely positioned at the intersection of the second groove and the first groove;

step 302, controlling the power device to drive the inner pipe to lift until the bottom of the clamping piece abuts against the bottom of the third groove, and finishing the lifting of the inner rod;

step four, drilling again: keeping the extension state of the telescopic drill rod, controlling the power device to drive the inner pipe to reversely turn to drill downwards, wherein in the process, the clamping piece is horizontally moved out of the intersection of the third groove and the first groove, and then the clamping piece is abutted against the top of the third groove under the action of the reverse downward force of the inner pipe and drives the outer pipe to reversely turn to drill downwards again; drilling until the depth of the designed hole is reached;

step five, primarily lifting the telescopic drill rod and grouting: keeping the extension state of the telescopic drill rod, controlling the power device to drive the inner pipe to rotate forwards and lift upwards, wherein in the process, the clamping piece completely enters the intersection of the third groove and the first groove, then the clamping piece is pressed against the bottom of the third groove under the action of the upward rotating force of the inner pipe and drives the outer pipe to rotate forwards and lift upwards until the power device lifts to a height threshold value, and in the process of rotating upwards and lifting the telescopic drill rod, the inner pipe is connected with grouting equipment to synchronously carry out concrete pouring construction, and the construction forms a first pile section;

step six, retracting the inner rod: stopping concrete pouring construction; controlling the power device to drive the inner pipe to descend until the top of the clamping piece abuts against the top of the second groove, so that the clamping piece completely enters the second groove after passing through the first groove, and the telescopic drill rod is retracted;

step seven, lifting the telescopic drill rod again and grouting: keeping the retraction state of the telescopic drill rod, controlling the power device to drive the inner pipe to reversely and upwardly lift, wherein in the process, the clamping piece horizontally moves out of the intersection of the second groove and the first groove, then the clamping piece is abutted against the bottom of the second groove under the action of the reverse upward force of the inner pipe, and drives the outer pipe to reversely and upwardly lift until the telescopic drill rod is lifted out of the formed drill hole; and in the process that the telescopic drill rod is reversely and upwards lifted, the inner pipe is connected with grouting equipment to synchronously carry out concrete pouring construction, and a second pile section is formed by construction.

Compared with the prior art, the invention has the following advantages:

1. the telescopic drill rod adopted by the invention is matched with the clamping piece through the groove unit, and no extra electric control device is arranged to control the telescopic drill rod to stretch, so that the structure is simple, the self weight of the telescopic drill rod is greatly reduced, and the telescopic drill rod is convenient to transport, load and unload.

2. The telescopic drill rod adopted by the invention is provided with the mounting pipe on the inner pipe and is connected with the power device, and the rotation and the up-and-down of the whole telescopic drill rod are controlled by controlling the rotation and the up-and-down of the inner pipe, so that the control process is simple and clear, the study and the operation are easy, the study time required by operating equipment is reduced, and the construction efficiency is improved.

3. The inner rod and the outer rod in the telescopic drill rod are detachably connected, so that the maintenance and the transportation of equipment are more convenient, when one of the inner rod or the outer rod is worn, the worn rod piece is replaced, the whole telescopic drill rod does not need to be purchased or manufactured again, the construction cost is saved, the service life of the equipment is prolonged in the limited construction cost, and the telescopic drill rod is economical and practical.

4. The method adopted by the invention has simple steps, the power device is utilized to drive the inner rod to rotate so as to enable the clamping piece to slide in the groove unit, the position of the clamping piece in the groove unit is controlled so as to control the drilling and lifting of the outer rod, the operation is convenient, no redundant electric device is required to be controlled, the number of control objects is reduced, the operation is convenient and easy, and the popularization and the use are convenient.

In conclusion, the telescopic drill rod has the advantages that the design is novel and reasonable, the inner rod and the outer rod are detachably connected by arranging the groove units to be matched with the clamping pieces, the structure is simple, the self weight of the telescopic drill rod is greatly reduced, the telescopic drill rod is convenient to transport, assemble and disassemble, the redundant electric control device is not required to be controlled to control the telescopic drill rod to stretch, the control process is simple and clear, the number of control objects is reduced, the operation is convenient and easy, and the popularization and the use are convenient.

The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.

Drawings

Fig. 1 is a schematic structural view of an inner rod of the telescopic drill rod of the present invention.

Fig. 2 is a top view of fig. 1 with the mounting tube removed.

Fig. 3 is a schematic structural view of an outer rod of the telescopic drill rod of the present invention.

Fig. 4 is a top view of fig. 3.

Fig. 5 is a schematic view showing the installation relationship of the inner rod, the outer rod and the drill bit of the telescopic drill rod of the present invention.

Fig. 6 is a using state diagram of the clamping piece and the second groove when the clamping piece is matched.

FIG. 7 is a view showing a usage state of the clip member abutting against the bottom of the third groove.

FIG. 8 is a view showing a state of use when the engaging member abuts against the top of the third groove.

Fig. 9 is a state view showing the use state of the inner rod of fig. 5 when it is extended.

FIG. 10 is a block flow diagram of a method of use of the present invention.

Description of reference numerals:

1-an outer tube; 2, a clamping piece; 3, inner tube;

4, installing a pipe; 5-a second groove; 6-a first groove;

7-third groove; 8-a dislocation slot; 9-drill bit.

Detailed Description

The telescopic drill rod shown in fig. 1 to 5 comprises an outer rod and an inner rod which is arranged in the outer rod and is in sliding fit with the outer rod, wherein the outer rod comprises an outer tube 1 and a clamping piece 2 which is fixedly arranged on the upper part of the inner wall of the outer tube 1, the inner rod comprises an inner tube 3 and an installation tube 4 which is arranged at the upper end of the inner tube 3 and is used for being matched with a power device of a pile machine, and a groove unit which is in sliding fit with the clamping piece 2 is arranged on the outer wall of the inner tube 3 along the length direction;

the groove unit comprises a first groove 6 which is formed along the length direction of the outer wall of the inner pipe 3, one end of the first groove 6, which is close to the installation pipe 4, is subjected to unidirectional diameter expansion to form a second groove 5, one end of the first groove 6, which is far away from the installation pipe 4, is subjected to unidirectional diameter expansion to form a third groove 7, the diameter expansion directions of the second groove 5 and the third groove 7 are the same, a dislocation groove 8 which is dislocated with the first groove 6 and is used for the joint piece 2 to enter the third groove 7 is formed in the outer wall of the inner pipe 3, the width of the joint piece 2 is smaller than or equal to that of the first groove 6, and the width of the dislocation groove 8 is larger than or equal to that of the joint piece 2.

It should be noted that in the construction of a general pile, a left-to-right anticlockwise drilling is adopted during drilling, as shown in fig. 1, in this embodiment, the second groove 5 and the third groove 7 are both grooves formed by expanding the first groove 6 leftwards, so that the clamping piece 2 is prevented from sliding up and down along the left side of the groove unit randomly when the drill rod rotates from left to right to drill, and the telescopic drill rod is ensured to work normally; in practical use, if clockwise drilling is adopted during drilling, the second groove 5 and the third groove 7 are both formed by expanding the first groove 6 rightwards, the rest sizes and the position relation are unchanged, and the application range is wide;

it should be noted that by arranging the groove unit to be matched with the clamping piece 2, no extra electric control device is arranged to control the telescopic drill rod to stretch, the structure is simple, the self weight of the telescopic drill rod is greatly reduced, and the transportation, the loading and the unloading are convenient;

the installation pipe 4 is arranged on the inner pipe 3 and connected with the power device, and the rotation, the up-down movement and the rotation of the whole telescopic drill rod are controlled by controlling the rotation, the up-down movement and the up-down movement of the inner pipe 3, so that the control process is simple and clear, the study and the operation are easy, the study time required by operating equipment is reduced, and the construction efficiency is improved;

the inner rod and the outer rod are detachably connected, so that the equipment is more convenient to maintain, when one of the inner rod or the outer rod is worn, the worn rod piece is replaced, the whole telescopic drill rod does not need to be purchased or manufactured again, the construction cost is saved, the service life of the equipment is prolonged in the limited construction cost, and the telescopic drill rod is economical and practical;

in this embodiment, dislocation groove 8 is the dovetail groove, the tip in dovetail groove is close to third recess 7 and sets up, the width more than or equal to the width of joint spare 2 and be less than the width of third recess 7 of the width more than or equal to of dovetail groove tip.

It should be noted that the small end of the trapezoidal groove is arranged close to the third groove 7, so that the clamping member 2 can more conveniently enter the third groove 7 from the large end of the trapezoidal groove, the operation difficulty of the clamping member 2 entering the third groove 7 is reduced, and the installation speed is increased;

in this embodiment, the outer diameter of the mounting tube 4 is greater than the inner diameter of the outer tube 1 and is equal to or less than the outer diameter of the outer tube 1.

It should be noted that the mounting tube 4 is clamped outside the outer tube 1, so that the inner rod can better drive the outer tube 1 to drill down, and the amount of dust entering the gap between the outer tube 1 and the inner tube 3 during drilling down can be reduced, thereby reducing the abrasion strength between the clamping piece 2 and the groove unit, prolonging the service life of the equipment, and being economical and practical;

in this embodiment, the clamping members 2 are sector annular clamping members, the number of the sector annular clamping members is multiple, the sector annular clamping members are circumferentially arranged along the inner wall of the outer tube 1, the number of the groove units is multiple, and the number of the groove units is the same as that of the clamping members and corresponds to that of the clamping members one to one.

It should be noted that by arranging the plurality of fan-shaped ring-shaped clamping pieces and the plurality of groove units, the strength of the telescopic drill rod structure is ensured, and if one of the fan-shaped ring-shaped clamping pieces is damaged, the rest fan-shaped ring-shaped clamping pieces can also work normally, so that response time is strived for maintenance of equipment, and construction accidents are avoided; in this embodiment, the number of the fan-shaped clamping pieces is three;

in this embodiment, the depth of the second groove 5, the depth of the third groove 7, the depth of the first groove 6, and the depth of the dislocation groove 8 are all the same.

It should be noted that the depths of the second groove 5, the third groove 7 and the first groove 6 are the same, so that the smoothness of the clamping piece 2 sliding in the groove unit is ensured, and the design is reasonable;

in this embodiment, the lower end of the outer tube 1 is provided with a drill bit 9, and the drill bit 9 is provided with a slurry outlet communicated with the inside of the inner tube 3.

A method of using a telescopic drill rod as shown in fig. 6 to 10, comprising the steps of:

step one, installation of a telescopic drill rod:

step 101, connecting an installation pipe 4 with the power device of the pile machine, controlling the power device to move and driving an inner pipe 3 to rotate, so that a dislocation groove 8 of the inner pipe 3 is aligned with a clamping piece 2 of an outer pipe 1, and driving the inner pipe 3 to descend by the power device so that the clamping piece 2 passes through the dislocation groove 8 and completely enters a third groove 7;

it should be noted that, by arranging the dislocation groove 8, the clamping member 2 can slide out of the third groove 7 to the outside of the inner tube 3, so that the inner rod and the outer rod are detachably connected, in this embodiment, the dislocation groove 8 is a trapezoidal groove, the small end of the trapezoidal groove is arranged close to the third groove 7, and the width of the small end of the trapezoidal groove is greater than or equal to the width of the clamping member 2 and smaller than the width of the third groove 7, so that in the installation process of the inner rod and the outer rod, the dislocation groove 8 can more conveniently align the clamping member 2, the clamping member 2 can slide into the third groove 7 without accurate alignment, the installation speed is accelerated, the requirement on accurate control of equipment is reduced, and learning and operation are facilitated;

102, controlling the power device to drive the inner pipe 3 to rotate until the clamping piece 2 is completely positioned at the intersection of the third groove 7 and the first groove 6, and then driving the inner pipe 3 to descend by the power device until the top of the clamping piece 2 abuts against the top of the second groove 5, so that the clamping piece 2 completely enters the second groove 5 after passing through the first groove 6;

in this embodiment, as shown in fig. 1, the second groove 5 and the third groove 7 are both formed by expanding the first groove 6 leftward, so that the direction of rotation of the inner tube 3 in step 102 is clockwise rotation;

103, controlling the power device to drive the inner pipe 3 to rotate reversely until the clamping piece 2 moves out of the intersection of the second groove 5 and the first groove 6 horizontally, so that the clamping piece 2 cannot move downwards under the limitation of the bottom of the second groove 5, and completing the installation of the telescopic drill rod;

in step 103, the inner tube 3 is rotated counterclockwise in the reverse direction;

it should be noted that, because the width of the second groove 5 is greater than that of the first groove 6, a limiting block is formed at the lower part of the diameter-expanded part of the second groove 5 compared with the first groove 6, and is used for limiting the up-and-down movement of the clamping piece 2 positioned in the second groove 5, so as to ensure the stable structure of the telescopic drill rod in the initial drilling process after the installation is completed;

in the installation process of the telescopic drill rod, the limitation of the top of the third groove 7 and the limitation of the bottom of the second groove 5 are skillfully utilized, redundant detection means are not needed, and the rotation angle of the inner rod required by installing the telescopic drill rod in the pile machine is not needed in advance, so that the installation of the telescopic drill rod can be conveniently completed, the operation is convenient and fast, and the use effect is good;

step two, preliminary drilling: keeping the retraction state of the telescopic drill rod, moving the pile machine to the side of a pile position to be constructed and aligning the telescopic drill rod to the pile position; the power device drives the telescopic drill rod to reversely turn to drill downwards until the distance between the top of the power device and the ground is 0.5-1 m, and at the moment, the drilling is stopped;

it should be noted that, in the process of initial drilling, when the distance between the top of the power device and the ground is 0.5m to 1m, the distance is limited by the height of a tower frame of a pile machine used in cooperation, the current drilling depth is the limit depth of drilling when the telescopic drill rod is in a retraction state, and when the limit depth does not reach the design hole depth, the telescopic drill rod needs to be extended so as to continue drilling under the condition that the height of the tower frame is fixed; compared with the height of the heightening tower, the telescopic drill rod is lower in drilling cost, and the tower with the lower height is convenient to disassemble and move in the whole construction process, so that the efficiency of whole construction is improved, the construction cost is reduced, and the telescopic drill rod is economical and practical;

step three, lifting the inner rod:

301, controlling the power device to drive the inner tube 3 to rotate forwards until the clamping piece 2 is completely positioned at the intersection of the second groove 5 and the first groove 6;

step 302, controlling the power device to drive the inner pipe 3 to lift until the bottom of the clamping piece 2 abuts against the bottom of the third groove 7, and finishing the lifting of the inner rod;

step four, drilling again: keeping the extension state of the telescopic drill rod, controlling the power device to drive the inner pipe 3 to reversely turn to drill downwards, wherein in the process, the clamping piece 2 horizontally moves out of the intersection of the third groove 7 and the first groove 6, and then the clamping piece 2 is abutted against the top of the third groove 7 under the action of the reverse downward force of the inner pipe 3 and drives the outer pipe 1 to reversely drill downwards again; drilling until the depth of the designed hole is reached;

step five, primarily lifting the telescopic drill rod and grouting: keeping the extension state of the telescopic drill rod, controlling the power device to drive the inner pipe 3 to rotate forwards and lift upwards, wherein in the process, the clamping piece 2 completely enters the intersection of the third groove 7 and the first groove 6, then the clamping piece 2 is abutted to the bottom of the third groove 7 under the action of the upward rotating force of the inner pipe 3 and drives the outer pipe 1 to rotate forwards and lift upwards until the power device is lifted to a height threshold value, and in the process of rotating forwards and lifting upwards the telescopic drill rod, the inner pipe 3 is connected with grouting equipment to synchronously perform concrete pouring construction, and the construction forms a first pile section;

step six, retracting the inner rod: stopping concrete pouring construction; controlling the power device to drive the inner pipe 3 to descend until the top of the clamping piece 2 abuts against the top of the second groove 5, so that the clamping piece 2 completely enters the second groove 5 after passing through the first groove 6, and completing retraction of the telescopic drill rod;

step seven, lifting the telescopic drill rod again and grouting: keeping the retraction state of the telescopic drill rod, controlling the power device to drive the inner pipe 3 to reversely rotate and lift upwards, wherein in the process, the clamping piece 2 horizontally moves out of the intersection of the second groove 5 and the first groove 6, then the clamping piece 2 is abutted against the bottom of the second groove 5 under the action of the reverse upward force of the inner pipe 3, and drives the outer pipe 1 to reversely rotate and lift upwards until the telescopic drill rod is lifted out of the formed drill hole; and in the process that the telescopic drill rod is reversely and upwards lifted, the inner pipe 3 is connected with grouting equipment to synchronously carry out concrete pouring construction, and a second pile section is formed by construction.

In actual use, when the outer side wall of the outer pipe 1 is provided with the thread drilling teeth, a first pile section formed by construction is a threaded section pile body; because promote the in-process of telescopic link and slip casting once more, power device drives 3 reversals of inner tube and upwards promotes, sweeps the spiral shell operation, and the second pile section that consequently the construction formed is straight-bar section pile body, and the bearing capacity of straight-bar section pile body is better, and straight-bar section pile body and screw thread section pile body cooperation are used and are made whole pile body result of use better under certain slip casting volume, and bearing capacity is stronger.

In conclusion, the telescopic drill rod has the advantages that the design is novel and reasonable, the inner rod and the outer rod are detachably connected by arranging the groove units to be matched with the clamping pieces 2, the structure is simple, the self weight of the telescopic drill rod is greatly reduced, the telescopic drill rod is convenient to transport, assemble and disassemble, the redundant electric control device is not required to be controlled to control the telescopic drill rod to stretch, the control process is simple and clear, the number of control objects is reduced, the operation is convenient and easy, and the popularization and the use are convenient.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.