CN116497805A - Rotary drilling, sinking and pulling integrated construction method for deep and easy-collapse bored concrete pile - Google Patents

Abstract

The invention relates to the technical field of cast-in-place pile construction, and discloses a deep cast-in-place pile rotary-digging full-casing drilling, sinking and pulling integrated construction method which comprises the following construction steps: 1) Determining a pile position of construction; 2) The power head drives the driving cylinder to drill the sleeve into the pile position through the connecting cylinder, and soil is taken into the sleeve through the drilling tool; 3) Pouring concrete into the pile hole through the guide pipe; 4) Sleeving the orifice sleeve pulling clamping mechanism on the sleeve, and pulling the sleeve out by the power head through the driving cylinder; the rotary drilling rig outputs torque and pressure to the sleeve through the power head matched with the connecting cylinder and the driving cylinder, so that the sleeve is drilled and sunk to a set depth at a pile position through the boot, soil is taken into the sleeve through the drilling tool, and a pile hole is formed in the sleeve; after the pile hole is finished and concrete pouring is finished, the power head pulls out the sleeve through the driving cylinder again, and the construction method completes sleeve drilling, sinking and pulling integrally through the rotary drilling rig, so that the problems of complex construction procedures and low drilling efficiency are solved.

Description

Rotary drilling, sinking and pulling integrated construction method for deep and easy-collapse bored concrete pile

Technical Field

The invention relates to the technical field of cast-in-place pile construction, in particular to a deep cast-in-place pile rotary-digging complete casing drilling, sinking and pulling integrated construction method.

Background

The construction of rotary-digging cast-in-place piles is carried out on a deep and easy-collapse stratum, and a deep and long sleeve is generally required to be sunk for wall protection, so that the sleeve penetrates through the easy-collapse stratum to ensure the stability of the hole wall.

At present, the traditional construction methods of deep and long sleeves mainly comprise three methods, namely, adopting a full-sleeve full-rotation pile drilling machine to lower the long sleeve, and carrying out soil sampling drilling by matching with a punching grab bucket; secondly, adopting a full-sleeve full-rotation drilling pile to lower a long sleeve, and taking soil by matching with a rotary drilling rig; thirdly, the vibrating hammer is used for sinking into the ultra-long sleeve, then the rotary drilling rig is used for taking out soil, and the three methods all need two large-scale equipment for cooperation construction, so that the working procedure is complex, and the drilling efficiency is low.

Disclosure of Invention

The invention aims to provide a deep and easy-collapse bored concrete pile rotary-digging complete casing drilling, sinking and pulling integrated construction method, and aims to solve the problems of complex construction procedures and low drilling efficiency in the prior art.

The invention discloses a rotary drilling, sinking and pulling integrated construction method for a deep and easy-collapse bored concrete pile, which comprises the following construction steps:

1) Leveling a construction site, and determining a pile position of construction; the rotary drilling rig is arranged at a construction site and comprises a power head and a drilling tool, wherein the power head is provided with a driving cylinder, the driving cylinder and the power head are in butt joint driving through a connecting cylinder, the top of the connecting cylinder is axially and circumferentially arranged along the bottom of the power head, the bottom of the connecting cylinder is detachably connected with the top of the driving cylinder, a sleeve is arranged at the bottom of the driving cylinder, and a boot with cutter teeth is arranged at the bottom of the sleeve;

2) The center of the sleeve and the center of the pile position are concentrically arranged through the rotary drilling rig; the power head drives the driving cylinder to drill the sleeve to the pile position through the connecting cylinder, presses down the sleeve until the sleeve is sunk to a set depth, and then detaches the driving cylinder from the sleeve, and takes soil into the sleeve through the drilling tool until a pile hole is formed in the sleeve;

3) After the pile hole is cleared, a reinforcement cage is lowered into the pile hole, then a guide pipe is lowered into the pile hole, and concrete is poured into the pile hole through the guide pipe until the pile hole is filled with the concrete;

4) Sleeving the orifice sleeve lifting clamping mechanism on the sleeve, wherein the sleeve is provided with an external pipe body exposed on the ground, and the orifice sleeve lifting clamping mechanism is circumferentially arranged along the periphery of the bottom of the external pipe body; the power head pulls out the sleeve through the driving cylinder.

Further, in the construction step 1), the connecting cylinder is provided with a hollow cavity penetrating up and down, and the hollow cavity is longitudinally arranged; the drilling tool is positioned in the hollow cavity, and a space is arranged between the outer side wall of the drilling tool and the inner side wall of the hollow cavity.

Further, the connecting cylinder is internally provided with a connector which is convexly arranged upwards and is clamped and connected with the power head, the top of the connector is exposed out of the connecting cylinder, the bottom of the connector is positioned in the hollow cavity, a spacing area is arranged between the inner side wall of the hollow cavity and the outer side wall of the connector, and the spacing area forms an annular clamping groove with an external opening.

Further, the outer Zhou Chaowai of the connector extends with an outer ring, the outer ring being located in the spacer region; the periphery butt of outside ring is on the inside wall of cavity, the inside wall of cavity encloses with the top of outside ring and the lateral wall of joint and forms the ring binder slot.

Further, be equipped with a plurality of outwards along the cardboard on the joint, a plurality of the cardboard is along the top circumference of joint around the interval arrangement, and is a plurality of the cardboard is connected with solid fixed ring, gu fixed ring's bottom butt is on the cardboard, adjacent form the lock groove that supplies power unit lock centre gripping between the cardboard.

Further, the connector is internally provided with a communication cavity penetrating up and down, and the communication cavity is respectively communicated with the hollow cavity and the buckling groove.

Further, in the construction step 1), a plurality of lock holes are formed in the top of the driving cylinder, the plurality of lock holes are arranged at intervals along the periphery of the driving cylinder in a surrounding manner, a plurality of connecting pins for fixing the sleeve are arranged on the bottom of the driving cylinder, the plurality of connecting pins are arranged at intervals along the periphery of the driving cylinder in a surrounding manner, and a positioning groove which is recessed inwards to form an external opening is formed in the bottom of the driving cylinder; the driving cylinder is provided with a plurality of exhaust holes, and the exhaust holes are circumferentially and circumferentially arranged at intervals along the periphery of the driving cylinder;

the top of the sleeve is provided with a plurality of pin holes for the connecting pins to penetrate through, the plurality of pin holes are arranged at intervals along the periphery of the sleeve in a surrounding manner, and the periphery of the sleeve is convexly provided with positioning blocks outwards; the sleeve is fixed on the driving cylinder through the connecting pin penetrating pin hole, and the inner side wall of the bottom of the driving cylinder is abutted against the outer side wall of the top of the sleeve; the periphery of the positioning block is abutted against the inner side wall of the positioning groove.

Further, in the construction step 4), the hole casing pulling and clamping mechanism comprises a clamping platform and an annular wall which is arranged along the inner end of the clamping platform and surrounds the bulge, a plurality of oppositely arranged screw locks and a plurality of cam locks are arranged on the clamping platform, and a plurality of cam locks and a plurality of screw locks are respectively arranged along the annular wall at intervals in a surrounding way; the screw lock and the cam lock are respectively abutted against the periphery of the outer pipe body;

the screw lock comprises a screw rod and a supporting plate, wherein the screw rod moves back and forth towards the central direction of the outer pipe body, the supporting plate is fixed on the annular wall, and the screw rod is connected with the supporting plate through threads so that at least part of the screw rod can be abutted against the outer pipe body;

the cam lock comprises a support and a cam, wherein the support is fixedly connected with the annular wall, and the cam is rotatably connected with the support so as to enable the cam to be at least partially abutted against the outer pipe body; the cam is arc-shaped towards one side of the outer pipe body and is provided with a plurality of saw teeth.

Further, a friction ring which generates resistance when being rubbed with the outer pipe body is arranged on the annular wall, the friction ring is circumferentially arranged along the inner side wall of the annular wall, an annular area which is annularly arranged is arranged between the inner side wall of the annular wall and the outer side wall of the outer pipe body, and the friction ring is positioned in the annular area;

the friction ring is provided with an inner end face which is arranged towards the outer pipe body, the inner end face is obliquely arranged from bottom to top, the lower part of the inner end face is provided with a plurality of balls, the balls are circumferentially and circumferentially arranged at intervals along the inner end face, and the balls are abutted against the outer side wall of the outer pipe body; the middle part of the inner end surface is abutted against the outer side wall of the outer pipe body, and the upper part of the inner end surface and the outer side wall of the outer pipe body are arranged at intervals; the bottom of the friction ring is propped against the ground;

in the construction step 4), when the outer pipe body sinks, the middle part of the inner end surface of the friction ring rubs with the outer pipe body, so that the inner end surface is obliquely arranged from top to bottom, the contact area between the inner end surface and the outer pipe body is increased, and friction resistance is generated;

and in the process of pulling out the outer pipe body upwards, the inner end surface of the friction ring reduces the friction resistance between the inner end surface of the friction ring and the outer side wall of the outer pipe body through the balls.

Further, in the construction step 2), the drilling tool includes a drilling barrel for drilling soil, a clamping ring is arranged on the drilling barrel, the clamping ring is circumferentially arranged along the periphery of the drilling barrel, a plurality of arc scraping blades which swing up and down are arranged on the clamping ring, the arc scraping blades are circumferentially arranged along the periphery of the clamping ring, a limit strip for positioning the swing range of the arc scraping blades is convexly arranged on the outer Zhou Chaowai of the clamping ring, the limit strip is circumferentially arranged along the periphery of the clamping ring, the limit strip is positioned below the arc scraping blades, the outer side wall of the limit strip and the inner side wall of the sleeve are arranged at intervals, a soil scraping area is arranged between the inner side wall of the sleeve and the outer side wall of the drilling barrel at intervals, and the arc scraping blades are positioned in the soil scraping area;

the arc-shaped scraping blade is provided with a scraping section which is bent and abutted towards the inner side wall of the sleeve, the outer side wall of the arc-shaped scraping blade is abutted with the inner side wall of the sleeve to form a connecting edge, and the scraping section is arranged in an extending mode along the length direction of the connecting edge;

in the construction step 2), when the arc scraping blade moves downwards in the sleeve in the process of downwards taking soil in the sleeve, and the arc scraping blade swings upwards when being blocked by clay on the inner side wall of the sleeve;

when drilling tool is taken out soil in the sleeve pipe and moves up the in-process, the arc doctor-bar moves up in the sleeve pipe, when the arc doctor-bar receives the hindrance of clay on the sleeve pipe inside wall, spacing supports in the bottom of arc doctor-bar, so that the cooperation of arc doctor-bar is scraped and is scraped the section and move up and scrape the clay on the sleeve pipe inside wall.

Compared with the prior art _， According to the construction method for the deep and easy-collapse bored concrete pile integrated with rotary drilling, sinking and pulling, the rotary drilling machine outputs torque and pressure to the sleeve through the power head matched with the connecting cylinder and the driving cylinder, so that the sleeve is drilled and sunk to a set depth at a pile position through the boot, soil is taken into the sleeve through the drilling tool, and a pile hole is formed in the sleeve; after the pile hole is finished and concrete pouring is finished, the power head pulls out the sleeve through the driving cylinder again, and the construction method completes sleeve drilling, sinking and pulling integrally through the rotary drilling rig, so that the problems of complex construction procedures and low drilling efficiency are solved; and the sleeve is prevented from sliding down into the pile position in the pulling-out process by the orifice sleeve pulling-out clamping mechanism.

Drawings

FIG. 1 is a construction flow schematic diagram of a rotary drilling, sinking and pulling integrated construction method for a deep and easy-collapse bored concrete pile;

FIG. 2 is a schematic structural view of the rotary drilling rig provided by the invention;

FIG. 3 is a schematic perspective view of a power head and a connecting cylinder, a driving cylinder and a sleeve provided by the invention;

FIG. 4 is a perspective view of a connecting cylinder provided by the invention;

FIG. 5 is a schematic perspective view of a drive cylinder provided by the present invention;

FIG. 6 is a schematic perspective view of a sleeve provided by the present invention;

fig. 7 is a schematic top view of the hole casing pulling and clamping mechanism provided by the invention;

FIG. 8 is a schematic structural view of an orifice sleeve pulling and clamping mechanism and a sleeve provided by the invention;

fig. 9 is a schematic structural diagram of a drilling tool and a casing provided by the present invention.

In the figure: rotary drilling machine 100, power head 200, drilling tool 300, connecting barrel 400, driving barrel 500, sleeve 600, boot 700, orifice sleeve pulling clamping mechanism 800, drilling barrel 301, clamping ring 302, arcuate wiper 303, stop bar 304, scraping section 305, joint 401, annular clamping groove 402, outer ring 403, clamping plate 404, fixing ring 405, snap-fit groove 406, communication cavity 407, locking hole 501, connecting pin 502, positioning groove 503, vent hole 504, pin hole 601, positioning block 602, clamping platform 801, annular wall 802, screw lock 803, screw 804, support plate 805, cam lock 806, support 807, cam 808, friction ring 809, inner end face 810, ball 811.

Detailed Description

The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

The implementation of the present invention will be described in detail below with reference to specific embodiments.

The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present invention, it should be understood that, if there is an azimuth or positional relationship indicated by terms such as "upper", "lower", "left", "right", etc., based on the azimuth or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not indicated or implied that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus terms describing the positional relationship in the drawings are merely illustrative and should not be construed as limiting the present invention, and specific meanings of the terms described above may be understood by those of ordinary skill in the art according to specific circumstances.

Referring to fig. 1-9, a preferred embodiment of the present invention is provided.

The deep and easy-collapse bored concrete pile rotary-digging complete casing drilling, sinking and pulling integrated construction method comprises the following construction steps:

1) Leveling a construction site, and determining a pile position of construction; arranging a rotary drilling rig 100 at a construction site, wherein the rotary drilling rig 100 comprises a power head 200 and a drilling tool 300, the power head 200 is provided with a driving barrel 500, the driving barrel 500 and the power head 200 are in butt joint driving through a connecting barrel 400, the top of the connecting barrel 400 is axially and circumferentially arranged along the bottom of the power head 200, the bottom of the connecting barrel 400 is detachably connected with the top of the driving barrel 500, the bottom of the driving barrel 500 is provided with a sleeve 600, and the bottom of the sleeve 600 is provided with a boot 700 with cutter teeth;

2) The center of the casing 600 is concentrically arranged with the center of the pile by the rotary drilling machine 100; the power head 200 drives the driving cylinder 500 to drill the sleeve 600 to a pile position through the connecting cylinder 400, presses down the sleeve 600 until the sleeve 600 is sunk to a set depth, and then detaches the driving cylinder 500 from the sleeve 600, and takes soil into the sleeve 600 through the drilling tool 300 until a pile hole is formed in the sleeve 600;

3) Cleaning the pile hole, lowering a reinforcement cage into the pile hole, lowering a guide pipe into the pile hole, and pouring concrete into the pile hole through the guide pipe until the pile hole is filled with the concrete;

4) Sleeving the orifice sleeve lifting clamping mechanism 800 on the sleeve 600, wherein the sleeve 600 is provided with an external pipe body exposed on the ground, and the orifice sleeve lifting clamping mechanism 800 is circumferentially arranged along the bottom periphery of the external pipe body; the power head 200 pulls out the sleeve 600 through the driving cylinder 500.

According to the construction method for integrally drilling, sinking and pulling the whole casing 600 of the deep and easy-to-collapse bored concrete pile, which is provided by the above-mentioned method, the rotary drilling rig 100 outputs torque and pressure to the casing 600 by the power head 200 in combination with the connecting cylinder 400 and the driving cylinder 500, so that the casing 600 is drilled and sunk to a set depth at a pile position by the boot 700, soil is taken into the casing 600 by the drilling tool 300, and a pile hole is formed in the casing 600; after the pile hole is finished and concrete pouring is finished, the power head 200 pulls out the sleeve 600 through the driving cylinder 500 again, and the construction method is to complete the drilling, sinking and pulling of the sleeve 600 integrally through the rotary drilling rig 100, so that the problems of complex construction procedures and low drilling efficiency are solved; and through the aperture sleeve extraction clamping mechanism 800, prevents sleeve 600 from sliding down into the pile location during extraction.

The whole processes of sinking the sleeve 600, rotary digging and taking out soil and lifting the sleeve 600 are implemented by adopting only one rotary digging and drilling machine 100, so that the effects of high construction work efficiency, good pile forming quality and low comprehensive cost are achieved, and good economic and social benefits are obtained.

In the construction step 1), the connecting cylinder 400 is provided with a hollow cavity penetrating up and down, and the hollow cavity is longitudinally arranged; the drilling tool 300 is positioned in the hollow cavity, and the outer side wall of the drilling tool 300 and the inner side wall of the hollow cavity are arranged at intervals; thus, the use of the drilling tool 300 is not affected when the connection cylinder 400 is mounted on the power head 200.

In this embodiment, the connecting cylinder 400 has a connector 401 protruding upward and clamped with the power head 200, the top of the connector 401 is exposed outside the connecting cylinder 400, the bottom of the connector 401 is located in a hollow cavity, a space area is formed between the inner side wall of the hollow cavity and the outer side wall of the connector 401, and the space area forms an annular clamping groove 402 with an external opening.

The connecting cylinder 400 is used for clamping and mounting the power head 200 through the connector 401, and then the annular clamping groove 402 formed between the connecting cylinder 400 and the connector 401 is used for embedding the bottom edge of the power head 200, so that the top of the connecting cylinder 400 is not damaged easily when the connecting cylinder 400 transmits output torque and pressure, and the connection between the connecting cylinder 400 and the power head 200 can be increased;

through the connection of the joint 401 and the interior of the power head 200, the connecting diameter is gradually enlarged by utilizing the connecting cylinder 400 and the driving cylinder 500, so that the large-aperture sleeve 600 can be indirectly connected with the power head 200 and bear the output torque and pressure of the power head 200, and the problem that the power head 200 is not corresponding to the large-aperture sleeve 600 in connection is solved.

In this embodiment, the outer Zhou Chaowai of the fitting 401 extends with an outer ring 403, the outer ring 403 being located in the spaced apart region; the outer circumference of the outer ring 403 abuts against the inner side wall of the hollow cavity, which encloses with the top of the outer ring 403 and the outer side wall of the joint 401 to form an annular clip groove 402.

The bottom edge of the power head 200 is limited to be embedded into the bottom of the annular clamping groove 402 by the outer ring 403, so that shaking is avoided after the connecting cylinder 400 is installed on the power head 200.

In this embodiment, a plurality of outwards-oriented clamping plates 404 are arranged on the connector 401, the clamping plates 404 are circumferentially and circumferentially arranged at intervals along the top of the connector 401, the clamping plates 404 are connected with fixing rings 405, the bottoms of the fixing rings 405 are abutted to the clamping plates 404, and buckling grooves 406 for buckling and clamping the power head 200 are formed between the adjacent clamping plates 404.

The connector 401 is used for clamping the power head 200 through the clamping grooves 406 formed by the clamping plates 404 and the fixing rings 405, so that the power head 200 can output torque and pressure to the sleeve 600 through the connector 401 and the connecting cylinder 400 and the driving cylinder 500.

The joint 401 is provided with a communicating cavity 407 penetrating up and down, and the communicating cavity 407 is respectively communicated with the hollow cavity and the buckling groove 406, so that the joint 401 cannot influence the use of the drilling tool 300.

In this embodiment, in the construction step 1), a plurality of lock holes 501 are provided on the top of the driving cylinder 500, the plurality of lock holes 501 are circumferentially spaced along the outer circumference of the driving cylinder 500, a plurality of connecting pins 502 for fixing the sleeve 600 are provided on the bottom of the driving cylinder 500, the plurality of connecting pins 502 are circumferentially spaced along the outer circumference of the driving cylinder 500, and the bottom of the driving cylinder 500 has a positioning groove 503 recessed inward to form an external opening; the driving cylinder 500 is provided with a plurality of exhaust holes 504, and the exhaust holes 504 are circumferentially and circumferentially arranged at intervals along the periphery of the driving cylinder 500;

the top of the sleeve 600 is provided with a plurality of pin holes 601 for the connecting pins 502 to penetrate, the plurality of pin holes 601 are circumferentially arranged at intervals along the periphery of the sleeve 600, and the periphery of the sleeve 600 is provided with positioning blocks 602 in an outward protruding mode; the sleeve 600 is fixed on the driving cylinder 500 through the pin holes 601 by the connecting pins 502, and the bottom inner side wall of the driving cylinder 500 is abutted on the top outer side wall of the sleeve 600; the outer periphery of the positioning block 602 abuts against the inner side wall of the positioning groove 503.

The driving cylinder 500 is connected with the bolt of the connecting cylinder 400 through the lock hole 501, the sleeve 600 is connected with the connecting pin 502 of the driving cylinder 500 through the pin hole 601, and the positioning block 602 of the sleeve 600 and the positioning groove 503 of the driving cylinder 500 are embedded and installed, so that the connection between the driving cylinder 500 and the sleeve 600 is more stable, and the output torque and the pressure of the power head 200 applied to the sleeve 600 by the driving cylinder 500 are improved.

In this embodiment, in the construction step 4), the hole casing pulling and holding mechanism 800 includes a holding platform 801 and an annular wall 802 disposed around the protrusion along the inner end of the holding platform 801, and the holding platform 801 is provided with a plurality of oppositely disposed screw locks 803 and a plurality of cam locks 806, and the plurality of cam locks 806 and the plurality of screw locks 803 are disposed around the annular wall 802 at intervals, respectively; the screw lock 803 and the cam lock 806 are respectively abutted against the outer periphery of the outer tube body;

the screw lock 803 includes a screw 804 reciprocally moving toward the center direction of the outer tube body, and a support plate 805, the support plate 805 being fixed to the annular wall 802, the screw 804 being screwed with the support plate 805 so that the screw 804 can be at least partially abutted against the outer tube body;

cam lock 806 includes a seat 807 fixedly coupled to annular wall 802 and a cam 808 rotatably coupled to seat 807 such that cam 808 at least partially abuts against the outer tubular body; the cam 808 is circular-arc shaped and has a plurality of saw teeth distributed on the side facing the outer tube.

The screw 804 is partially abutted against the outer tube body, and the mating cam 808 and the plurality of saw teeth are abutted against the outer tube body, so that the sleeve 600 can be fixed without sinking, and therefore, the operation is convenient, safe and reliable when the sleeve 600 is disassembled.

In this embodiment, a friction ring 809 for generating resistance by friction with the outer pipe body is provided on the annular wall 802, the friction ring 809 is circumferentially arranged along the inner side wall of the annular wall 802, an annular area is provided between the inner side wall of the annular wall 802 and the outer side wall of the outer pipe body, and the friction ring 809 is located in the annular area;

the friction ring 809 has an inner end face 810 disposed toward the outer tube body, the inner end face 810 being disposed obliquely from bottom to top, a plurality of balls 811 being provided at a lower portion of the inner end face 810, the plurality of balls 811 being disposed circumferentially around the inner end face 810 at intervals, the balls 811 abutting on an outer side wall of the outer tube body; the middle part of the inner end face 810 is abutted on the outer side wall of the outer pipe body, and the upper part of the inner end face 810 and the outer side wall of the outer pipe body are arranged at intervals; the bottom of friction ring 809 is pressed against the ground;

in the construction step 4), when the outer pipe body sinks, the middle part of the inner end face 810 of the friction ring 809 rubs with the outer pipe body, so that the inner end face 810 is obliquely arranged from top to bottom, the contact area between the inner end face 810 and the outer pipe body is increased, and friction resistance is generated;

during the upward extraction of the outer tube, the inner end face 810 of the friction ring 809 reduces frictional resistance with the outer side wall of the outer tube by means of balls 811.

The friction ring 809 is abutted with the outer pipe body through the middle part of the inner end face 810 to form a friction section, and the lower part of the inner end face 810 is abutted with the outer pipe body through the balls 811, so that in the process of upward movement of the outer pipe body, the outer pipe body drives the middle part of the inner end face 810 to swing upwards due to friction, and the lower part of the inner end face 810 reduces friction with the outer pipe body through the balls 811, and therefore the friction ring 809 does not have great influence on the outer pipe body in the process of upward movement of the outer pipe body;

when the outer pipe moves downward, the middle part of the inner end surface 810 is biased downward due to friction with the outer pipe, so that the upper part of the inner end surface 810 is abutted on the outer pipe, thereby increasing friction resistance between the friction ring 809 and the outer pipe, and further preventing the sleeve 600 from sliding down when the sleeve 600 is detached by friction.

In this embodiment, in the construction step 2), the drilling tool 300 includes a drilling barrel 301 for drilling soil, a clamping ring 302 is disposed on the drilling barrel 301, the clamping ring 302 is circumferentially disposed along the outer periphery of the drilling barrel 301, a plurality of arc-shaped scraping blades 303 swinging up and down are disposed on the clamping ring 302, the plurality of arc-shaped scraping blades 303 are circumferentially disposed along the outer periphery of the clamping ring 302, a limit bar 304 for positioning the swinging range of the arc-shaped scraping blades 303 is convexly disposed on the outer Zhou Chaowai of the clamping ring 302, the limit bar 304 is circumferentially disposed along the outer periphery of the clamping ring 302, the limit bar 304 is located below the arc-shaped scraping blades 303, the outer side wall of the limit bar 304 and the inner side wall of the sleeve 600 are disposed at intervals, a soil scraping area is disposed between the inner side wall of the sleeve 600 and the outer side wall of the drilling barrel 301, and the arc-shaped scraping blades 303 are located in the soil scraping area;

the arc-shaped scraping blade 303 is provided with a scraping section 305 which is bent and abutted towards the inner side wall of the sleeve 600, the outer side wall of the arc-shaped scraping blade 303 is abutted with the inner side wall of the sleeve 600 to form a connecting edge, and the scraping section 305 is arranged in an extending manner along the length direction of the connecting edge;

in the construction step 2), when the arc wiper 303 moves downward in the casing 600 during the downward soil sampling movement of the drilling tool 300 in the casing 600, the arc wiper 303 swings upward when the arc wiper 303 is blocked by clay on the inner side wall of the casing 600; thus, the arcuate wiper 303 does not scrape clay down the inside wall of the sleeve 600;

when the arc-shaped scraping blade 303 moves upwards in the sleeve 600 in the process that the drilling tool 300 fetches earth and moves upwards in the sleeve 600, and the arc-shaped scraping blade 303 is blocked by clay on the inner side wall of the sleeve 600, the limiting strip 304 is supported at the bottom of the arc-shaped scraping blade 303, so that the arc-shaped scraping blade 303 is matched with the scraping section 305 to move upwards to scrape the clay on the inner side wall of the sleeve 600; in this way, the arcuate wiper 303 is enabled to form a one-way wiper away from clay on the inside wall of the sleeve 600.

The construction flow comprises the following steps:

1. perforating the hole

1) The hole can be formed by adopting a rotary drilling barrel or directly adopting a sleeve with a boot;

2) When the rotary drilling drum is used for drilling holes, the center of the rotary drilling tool is aligned with the center point of the pile position, the drilling tool is lowered to the ground, the rotary drilling tool is rotated and pressed down to start drilling holes, and the drilling depth is determined by that the holes do not collapse.

2. Sinking the first steel sleeve with boot

1) Connecting the first section of sleeve with the driving cylinder, fully opening the connecting pin of the driving cylinder clockwise before installing the sleeve, and stirring the connecting pin anticlockwise after the driving cylinder is fully inserted into the sleeve to fix the sleeve;

2) Slowly lowering a sleeve connected with the boot into the drilled hole, adjusting the verticality of the sleeve through a power head of the rotary drilling rig, and confirming that the verticality of the sleeve meets the requirement;

3) And after the verticality meets the requirement, the power head of the rotary drilling rig is rotated, the driving cylinder is rotated and pressurized, and the sleeve begins to cut the soil layer and sink.

3. Extension and sinking of sleeve orifice

1) When the first section of sleeve is sunk to the exposed ground for about 1m, the sinking is stopped, and the sleeve is lengthened;

2) The connecting pin of the driving cylinder is shifted clockwise to unlock the driving cylinder and the sleeve, and the driving cylinder is lifted;

3) Connecting the driving cylinder with another section of sleeve, shifting the rotary drilling rig to the position above the first section of sleeve, adjusting the power head to enable a positioning groove below the sleeve to be inserted into a positioning block above the first section of sleeve, and slowly lowering;

4) The butt joint of the two sections of sleeves is completed, before the bolts are installed, the pin holes and the floating mud of the columnar bolts are washed clean by a high-adding water gun, after the bolts are installed, the bolts are manually fastened by a wrench, and then the bolts are fastened by an electric wrench;

5) After the sleeve connection is completed, detecting the verticality of the sleeve by using a horizontal guiding ruler, checking the pile position by using a straight ruler, and adjusting in time if the pile position does not meet the requirements;

6) And the power head of the rotary drilling rig rotates and presses down the sinking sleeve, when the top of the sinking sleeve is about 1m away from the ground, the sinking is stopped, and the sleeve lengthening step is continuously repeated.

4. Rotary drilling tool casing pipe inner soil sampling

1) The friction resistance of the sleeve is increased along with the continuous sinking of the sleeve, and when the sleeve is difficult to continuously sink, a rotary drilling tool is used for taking soil in the sleeve;

2) After the soil taking of the rotary drilling tool is completed, the connecting pin of the driving cylinder is shifted anticlockwise, so that the driving cylinder is connected and separated with the sleeve, and the driving cylinder is lifted; when the joint of the driving cylinder and the sleeve is positioned at a high position and a constructor can not stir by stretching hands, the self-made long hook can be used for stirring the connecting pin;

3) Extending a drill rod of the rotary drilling rig, taking soil in the sleeve by using the rotary drilling rig, and discharging the soil into a dregs box for temporary stacking; the soil sampling depth is flat with the bottom of the sleeve or slightly deeper than the bottom of the sleeve, so that the hole bottom is ensured not to collapse;

4) Repeating the working steps of casing pressing in, rotary digging in the casing, taking out soil, unloading slag and the like until the drilling depth passes through the stratum with easy hole collapse or meets the design pile bottom elevation.

5. Rotary drilling in casing

1) After the casing passes through the stratum with easy collapse holes and enters the rock surface, normal rotary drilling in the casing is started;

2) And removing the connection between the driving cylinder and the sleeve, and performing drilling, soil taking and soil unloading operations by the normal rotary drilling bit until the drilling depth meets the design pile bottom elevation.

6. Clearing holes, lowering reinforcement cages, placing pouring guide pipes and pouring pile body concrete

1) After drilling reaches the design requirement, a hole bottom is cleaned by using a hole cleaning and slag dragging drill bit, and sediment at the hole bottom is cleaned cleanly;

2) When the crane hangs the steel reinforcement cage to enter the hole, dispatching a special person to command, and stably rotating the crane;

3) After the steel reinforcement cage is lifted up to be qualified, installing a pouring guide pipe, wherein the diameter of the guide pipe is 250mm, and the joint is firmly connected and is provided with a sealing ring, so that water leakage and water tightness are ensured;

4) After the secondary hole cleaning meets the requirements, pile body concrete pouring is carried out, and during pouring, super-retarding concrete is used for 12 hours, so that the situation that the sleeve cannot be pulled out due to solidification of the concrete before all the sleeves are not pulled out is avoided;

5) The quantity of the first poured concrete meets the requirement that the first embedding depth of the guide pipe is more than 1.0m, and continuous pouring is kept; in the pouring process, a special person is dispatched to periodically measure the rising height of the concrete surface in the sleeve and the concrete in the guide pipe, the guide pipe is removed in time, and the depth of the buried pipe is controlled to be 2-6 m.

7. Pulling clamping mechanism for placing orifice sleeve

1) After the concrete pouring is completed, the sleeve is pulled out;

2) Before the sleeve is pulled out, the driving cylinder of the rotary drilling rig is separated from the sleeve, the rotary drilling rig is slowly lowered from the upper part of the sleeve, and the orifice sleeve pulling clamping mechanism is sleeved into the sleeve;

3) After the orifice sleeve lifting clamping mechanism is in place, the cushion block is used for placing the orifice sleeve lifting clamping mechanism stably and keeping the plane of the clamping platform horizontal.

8. Section-by-section sleeve pipe

1) Positioning the rotary drilling rig, aligning the rotary drilling rig with the center of the sleeve, lowering the driving cylinder to be in butt joint with the orifice sleeve, and fastening and connecting the rotary drilling rig with the orifice sleeve by adopting bolts;

2) The power head of the rotary drilling rig outputs torque to enable the connecting cylinder and the driving cylinder to rotate, and simultaneously, pulling force is applied to gradually pull the sleeve out of the orifice;

3) When the upper section sleeve is completely pulled out and the lower section sleeve is pulled out from the ground by about 1m, the screw rod of the screw rod lock is screwed out clockwise, short steel bars welded on the sleeve are clamped, the cam lock is controlled to clamp the sleeve, and the long Kong Nachao sleeve is fixed under the combined action of the cam lock and the screw rod lock, so that the sleeve is prevented from sinking;

4) Flushing the positions of the pin holes by using a high-pressure water gun, symmetrically loosening the connecting pins one by one, and loosening the two sections of sleeves; lifting the driving cylinder, and starting the rotary drilling rig to move the first section of sleeve beside the pile position or to move the first section of sleeve to the next pile hole after the upper section of sleeve and the lower section of sleeve are completely separated;

5) Repeating the steps, and completely pulling out the sleeve and the sleeve with the boot at the first joint.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.

Claims (10)

1. The rotary drilling, sinking and pulling integrated construction method for the deep and easy-collapse bored concrete pile is characterized by comprising the following construction steps of:

1) Leveling a construction site, and determining a pile position of construction; the rotary drilling rig is arranged at a construction site and comprises a power head and a drilling tool, wherein the power head is provided with a driving cylinder, the driving cylinder and the power head are in butt joint driving through a connecting cylinder, the top of the connecting cylinder is axially and circumferentially arranged along the bottom of the power head, the bottom of the connecting cylinder is detachably connected with the top of the driving cylinder, a sleeve is arranged at the bottom of the driving cylinder, and a boot with cutter teeth is arranged at the bottom of the sleeve;

2) The center of the sleeve and the center of the pile position are concentrically arranged through the rotary drilling rig; the power head drives the driving cylinder to drill the sleeve to the pile position through the connecting cylinder, presses down the sleeve until the sleeve is sunk to a set depth, and then detaches the driving cylinder from the sleeve, and takes soil into the sleeve through the drilling tool until a pile hole is formed in the sleeve;

3) After the pile hole is cleared, a reinforcement cage is lowered into the pile hole, then a guide pipe is lowered into the pile hole, and concrete is poured into the pile hole through the guide pipe until the pile hole is filled with the concrete;

4) Sleeving the orifice sleeve lifting clamping mechanism on the sleeve, wherein the sleeve is provided with an external pipe body exposed on the ground, and the orifice sleeve lifting clamping mechanism is circumferentially arranged along the periphery of the bottom of the external pipe body; the power head pulls out the sleeve through the driving cylinder.

2. The method for integrally constructing the deep and easy-collapse bored concrete pile by rotary drilling, sinking and pulling, as set forth in claim 1, characterized in that in the constructing step 1), the connecting cylinder has hollow cavities penetrating up and down, and the hollow cavities are longitudinally arranged; the drilling tool is positioned in the hollow cavity, and a space is arranged between the outer side wall of the drilling tool and the inner side wall of the hollow cavity.

3. The method for integrally constructing the rotary drilling, sinking and pulling of the deep and easy-collapse bored concrete pile according to claim 2, wherein the connecting cylinder is provided with a joint which is convexly arranged upwards and is in clamping connection with the power head, the top of the joint is exposed out of the connecting cylinder, the bottom of the joint is positioned in the hollow cavity, a spacing area is arranged between the inner side wall of the hollow cavity and the outer side wall of the joint, and the spacing area forms an annular clamping groove with an external opening.

4. A method of rotary drilling, sinking and pulling a complete casing pipe for a deep and easy-collapse bored concrete pile according to claim 3, wherein the outer Zhou Chaowai of the joint is extended with an outer ring, and the outer ring is located in a spacing area; the periphery butt of outside ring is on the inside wall of cavity, the inside wall of cavity encloses with the top of outside ring and the lateral wall of joint and forms the ring binder slot.

5. The method for integrally constructing the rotary drilling, sinking and pulling of the deep and easy-collapse bored concrete pile according to claim 4, wherein a plurality of outwards-extending clamping plates are arranged on the joint, the clamping plates are circumferentially and circumferentially arranged at intervals along the top of the joint, a plurality of clamping plates are connected with fixing rings, the bottoms of the fixing rings are abutted against the clamping plates, and buckling grooves for buckling and clamping power heads are formed between the adjacent clamping plates.

6. The method for integrally constructing the deep and easy-collapse bored concrete pile by rotary drilling, sinking and pulling, as set forth in claim 5, wherein the joint has a communicating cavity penetrating up and down, and the communicating cavity is respectively communicated with the hollow cavity and the buckling groove.

7. The method for integrally constructing the rotary drilling, sinking and pulling of the deep and easy-collapse bored concrete pile according to any one of claims 1 to 6, wherein in the construction step 1), a plurality of lock holes are formed in the top of the driving barrel, the plurality of lock holes are arranged at intervals along the periphery of the driving barrel in a surrounding manner, a plurality of connecting pins for fixing the sleeve are arranged at intervals along the periphery of the driving barrel in the bottom of the driving barrel, and positioning grooves for forming an external opening are formed in the bottom of the driving barrel in an inward sinking manner; the driving cylinder is provided with a plurality of exhaust holes, and the exhaust holes are circumferentially and circumferentially arranged at intervals along the periphery of the driving cylinder;

the top of the sleeve is provided with a plurality of pin holes for the connecting pins to penetrate through, the plurality of pin holes are arranged at intervals along the periphery of the sleeve in a surrounding manner, and the periphery of the sleeve is convexly provided with positioning blocks outwards; the sleeve is fixed on the driving cylinder through the connecting pin penetrating pin hole, and the inner side wall of the bottom of the driving cylinder is abutted against the outer side wall of the top of the sleeve; the periphery of the positioning block is abutted against the inner side wall of the positioning groove.

8. A deep and easy collapse bored concrete pile rotary drilling, sinking and pulling integrated construction method according to any one of claims 1 to 6, wherein in the construction step 4), the orifice sleeve pulling clamping mechanism comprises a clamping platform and an annular wall which is arranged around the bulge along the inner end of the clamping platform, a plurality of oppositely arranged screw locks and a plurality of cam locks are arranged on the clamping platform, and a plurality of the cam locks and a plurality of the screw locks are respectively arranged along the annular wall at intervals around the annular wall; the screw lock and the cam lock are respectively abutted against the periphery of the outer pipe body;

the screw lock comprises a screw rod and a supporting plate, wherein the screw rod moves back and forth towards the central direction of the outer pipe body, the supporting plate is fixed on the annular wall, and the screw rod is connected with the supporting plate through threads so that at least part of the screw rod can be abutted against the outer pipe body;

the cam lock comprises a support and a cam, wherein the support is fixedly connected with the annular wall, and the cam is rotatably connected with the support so as to enable the cam to be at least partially abutted against the outer pipe body; the cam is arc-shaped towards one side of the outer pipe body and is provided with a plurality of saw teeth.

9. The rotary drilling, sinking and pulling integrated construction method for the deep and easy-collapse bored concrete pile according to claim 8, wherein a friction ring which generates resistance with the friction of an external pipe body is arranged on the annular wall, the friction ring is circumferentially arranged along the inner side wall of the annular wall, an annular area which is annularly arranged is arranged between the inner side wall of the annular wall and the outer side wall of the external pipe body, and the friction ring is positioned in the annular area;

the friction ring is provided with an inner end face which is arranged towards the outer pipe body, the inner end face is obliquely arranged from bottom to top, the lower part of the inner end face is provided with a plurality of balls, the balls are circumferentially and circumferentially arranged at intervals along the inner end face, and the balls are abutted against the outer side wall of the outer pipe body; the middle part of the inner end surface is abutted against the outer side wall of the outer pipe body, and the upper part of the inner end surface and the outer side wall of the outer pipe body are arranged at intervals; the bottom of the friction ring is propped against the ground;

in the construction step 4), when the outer pipe body sinks, the middle part of the inner end surface of the friction ring rubs with the outer pipe body, so that the inner end surface is obliquely arranged from top to bottom, the contact area between the inner end surface and the outer pipe body is increased, and friction resistance is generated;

and in the process of pulling out the outer pipe body upwards, the inner end surface of the friction ring reduces the friction resistance between the inner end surface of the friction ring and the outer side wall of the outer pipe body through the balls.

10. The method for integrally constructing the rotary drilling, sinking and pulling of the deep and easy-collapse bored concrete pile according to any one of claims 1 to 6, wherein in the construction step 2), the drilling tool comprises a drilling barrel for drilling soil, a clamping ring is arranged on the drilling barrel, the clamping ring is circumferentially arranged along the periphery of the drilling barrel, a plurality of arc scraping blades which swing up and down are arranged on the clamping ring, a plurality of arc scraping blades are circumferentially arranged along the periphery of the clamping ring, a limit strip for positioning the swing range of the arc scraping blades is convexly arranged on the outer Zhou Chaowai of the clamping ring, the limit strip is circumferentially arranged along the periphery of the clamping ring, the limit strip is positioned below the arc scraping blades, the outer side wall of the limit strip is arranged at intervals with the inner side wall of the sleeve, a soil scraping area is arranged between the inner side wall of the sleeve and the outer side wall of the drilling barrel, and the arc scraping blades are positioned at intervals;

the arc-shaped scraping blade is provided with a scraping section which is bent and abutted towards the inner side wall of the sleeve, the outer side wall of the arc-shaped scraping blade is abutted with the inner side wall of the sleeve to form a connecting edge, and the scraping section is arranged in an extending mode along the length direction of the connecting edge;

in the construction step 2), when the arc scraping blade moves downwards in the sleeve in the process of downwards taking soil in the sleeve, and the arc scraping blade swings upwards when being blocked by clay on the inner side wall of the sleeve;

when drilling tool is taken out soil in the sleeve pipe and moves up the in-process, the arc doctor-bar moves up in the sleeve pipe, when the arc doctor-bar receives the hindrance of clay on the sleeve pipe inside wall, spacing supports in the bottom of arc doctor-bar, so that the cooperation of arc doctor-bar is scraped and is scraped the section and move up and scrape the clay on the sleeve pipe inside wall.