CN113513256B - Pile expanding equipment for road and bridge engineering - Google Patents

Pile expanding equipment for road and bridge engineering Download PDF

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Publication number
CN113513256B
CN113513256B CN202110273979.XA CN202110273979A CN113513256B CN 113513256 B CN113513256 B CN 113513256B CN 202110273979 A CN202110273979 A CN 202110273979A CN 113513256 B CN113513256 B CN 113513256B
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outer cylinder
material lifting
pile
rotary outer
driving
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CN113513256A (en
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汪德旺
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/02—Drilling rigs characterised by means for land transport with their own drive, e.g. skid mounting or wheel mounting
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B15/00—Supports for the drilling machine, e.g. derricks or masts
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/22—Rods or pipes with helical structure
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/28—Enlarging drilled holes, e.g. by counterboring

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Mechanical Engineering (AREA)
  • Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)

Abstract

The embodiment of the invention relates to the field of road and bridge construction equipment, and particularly discloses pile expanding equipment used for road and bridge engineering, which comprises the following components: the height of the rotary outer cylinder is adjusted through a height adjusting device; the material lifting mechanism is rotatably arranged in the rotary outer cylinder and comprises a material lifting barrel rotatably arranged in the rotary outer cylinder, and a material lifting propeller is coaxially and rotatably arranged in the material lifting barrel; and the pressure expanding part is linked with the material lifting mechanism through a push-pull part, wherein the pressure expanding part comprises a pressure expanding plate, and the rotary material lifting cylinder enables the pressure expanding plate to extend out or retract from the rotary outer cylinder. The embodiment of the invention can not only extrude the soil wall to increase the space, but also extrude the soil to increase the compactness of the soil on the inner wall of the pile pit so as to increase the firmness of the pile body.

Description

Pile expanding equipment for road and bridge engineering
Technical Field
The embodiment of the invention relates to the technical field of road and bridge construction equipment, in particular to pile expanding equipment used in road and bridge engineering.
Background
The municipal road and bridge engineering comprises urban public service engineering such as urban roads, bridges, traffic facilities and the like. Road maintenance and repair are part of municipal road and bridge engineering, and pile expanding equipment is an indispensable tool for workers during construction.
The pile foundation is a deep foundation consisting of piles and pile bearing platforms connected with the pile tops or a single pile foundation connected with the pile foundations through columns, and is called the pile foundation for short. Since the pile foundation is mainly buried deep below the ground surface, in order to realize effective pile extension and ensure high stability of the foundation pile after the pile extension, it is necessary to perform an extension process on the bottom of the pile pit.
The existing pile expanding equipment directly utilizes the rotation of a large spiral column to take out the soil in the pile pit, the compactness of the soil on the inner wall of the pile pit is insufficient, and the firmness of a pile body is influenced, so that the pile driving equipment is large in size and poor in stability after pile hole pouring.
Disclosure of Invention
The embodiment of the invention aims to provide pile expanding equipment for road and bridge engineering, which aims to solve the problems that the existing pile expanding equipment directly utilizes the rotation of a larger spiral column to take out soil in a pile pit, the compactness of the soil on the inner wall of the pile pit is insufficient, the firmness of a pile body is influenced, the size of the pile driving equipment is larger, and the stability of a pile hole after pouring is poor.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:
a pile extension apparatus for road and bridge engineering, said pile extension apparatus comprising:
the height of the rotary outer cylinder is adjusted through a height adjusting device;
the material lifting mechanism is rotatably arranged in the rotary outer cylinder and comprises a material lifting cylinder rotatably arranged in the rotary outer cylinder, and a material lifting propeller is coaxially and rotatably arranged in the material lifting cylinder; and
and the material lifting mechanism is linked with the material spreading part through a push-pull part, the material spreading part comprises a material spreading plate, and the rotating material lifting cylinder enables the material spreading plate to extend out or retract from the rotating outer cylinder.
As a further limitation of the technical solution of the embodiment of the present invention, the push-pull portion includes:
the eccentric turntable is eccentrically and fixedly sleeved on the outer ring of the material lifting barrel, and the outer ring of the eccentric turntable is slidably connected with the pressure expansion plate.
As a further limitation of the technical solution of the embodiment of the present invention, the diffuser further includes:
at least two groups of supporting ring blocks, the supporting ring blocks are fixedly arranged on the inner side of the diffuser plate, and the supporting ring blocks are supported and slidably arranged in supporting ring grooves formed in the outer ring of the eccentric turntable.
As a further limitation of the technical solution of the embodiment of the present invention, the pile expanding apparatus further includes a base, the height-adjusting device is disposed at one side of the base, the rotary outer cylinder is rotatably disposed on the support sleeve in a penetrating manner, and the support sleeve is connected to the height-adjusting device.
As a further limitation of the technical solution of the embodiment of the present invention, the height adjusting device includes:
the upright post is installed on one side of the base;
the support screw rod is rotatably arranged on the upright post; and
the lifting slide block is fixedly connected with the supporting sleeve, the lifting slide block moves on the stand column along the supporting screw rod, and the lifting slide block is installed on the supporting screw rod in a threaded connection mode.
As a further limitation of the technical solution of the embodiment of the present invention, the pile expanding apparatus further includes:
and the first driving piece is arranged on the rotary outer barrel and is used for driving the at least two groups of lifting mechanisms to operate.
As a further limitation of the technical solution of the embodiment of the present invention, the pile expanding equipment further includes:
and the second driving piece is arranged on one side of the support sleeve and used for driving the rotary outer cylinder to rotate.
As a further limitation of the technical solution of the embodiment of the present invention, the pile expanding apparatus further includes:
the third driving piece is used for driving the material lifting propeller to rotate, the third driving piece is installed on the support, and the support is installed on the rotating outer barrel.
As a further limitation of the technical solution of the embodiment of the present invention, the pile expanding equipment further includes:
four groups of moving members respectively arranged at four corners of the base
Compared with the prior art, the embodiment of the invention has the beneficial effects that:
on one hand, the embodiment of the invention utilizes the rotating material lifting propeller to take out the soil in the pile pit, when the material lifting barrel is rotated, the eccentric turntable can be driven to eccentrically rotate around the material lifting barrel, meanwhile, as the pressure expanding plate is in sliding connection with the eccentric turntable, the eccentrically rotating eccentric turntable pushes the pressure expanding plate to continuously extend out of the rotating outer barrel or retract into the rotating outer barrel to extend out of the pressure expanding plate of the rotating outer barrel, the soil in the inner wall of the pile pit can be compacted, the soil wall can be extruded to increase space, and the soil is extruded to increase the compactness of the soil in the inner wall of the pile pit so as to increase the firmness of a pile body;
on the other hand, when the rotating angle of the rotating outer cylinder is adjusted, the position of the expanding plate in the pile pit can be flexibly adjusted, and the inner wall of the pile pit is prevented from having compaction dead angles.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention.
Fig. 1 is a schematic structural diagram of pile expanding equipment used in road and bridge engineering according to an embodiment of the present invention.
Fig. 2 is a sectional view of pile-expanding equipment used in road and bridge construction according to an embodiment of the present invention.
Fig. 3 is a perspective view of a first linkage portion of pile expanding equipment used in road and bridge engineering according to an embodiment of the present invention.
Fig. 4 is a perspective view of a push-pull portion of a pile expanding apparatus used in road and bridge construction according to an embodiment of the present invention.
Fig. 5 is a perspective view of a diffuser in the pile expanding equipment used in road and bridge engineering according to an embodiment of the present invention.
In the figure: 100-rotating outer cylinder, 101-servo motor, 102-supporting sleeve, 103-accommodating window; 200-a base; 300-a height-adjusting device; 400-a material lifting barrel, 401-a bracket, 402-a material lifting propeller, 403-an eccentric turntable and 404-a supporting ring groove; 500-diffusion plate, 501-support ring block, 502-driving motor.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Specific implementations of the present invention are described in detail below with reference to specific embodiments.
Fig. 1 shows a structural diagram of pile expanding equipment used in road and bridge engineering according to an embodiment of the present invention.
As shown in fig. 1, in a preferred embodiment provided by the present invention, a pile expanding apparatus for road and bridge construction includes:
a rotary outer cylinder 100, the height of which is adjusted by a height adjusting device 300;
the material lifting mechanisms are rotatably arranged in the rotary outer barrel 100 and comprise a material lifting barrel 400 rotatably arranged in the rotary outer barrel 100, and a material lifting propeller 402 is coaxially and rotatably arranged in the material lifting barrel 400; and
and the diffuser is linked with the material lifting mechanism through a push-pull part, wherein the diffuser comprises a diffuser plate 500, and the rotating material lifting cylinder 400 enables the diffuser plate 500 to extend out of or retract into the rotating outer cylinder 100.
Specifically, in the embodiment provided by the present invention, the rotating outer cylinder 100 is an object having a cavity inside, and the cavity may be a circle or a square, which is not limited herein;
preferably, the outer ring of the rotating outer cylinder is of a circular structure.
Fig. 2 shows a cross-sectional view of a pile expanding apparatus used in road and bridge engineering according to an embodiment of the present invention.
As shown in fig. 1-2, in another preferred embodiment of the present invention, a plurality of sets of receiving windows 103 are formed on the rotating outer cylinder 100, the plurality of sets of receiving windows 103 correspond to a plurality of sets of pressure expanding plates 500 one by one, and the pressure expanding plates 500 can pass through the receiving windows 103.
Further, with continuing reference to fig. 1-2, in a preferred embodiment of the present invention, the push-pull portion comprises:
the eccentric turntable 403 is eccentrically and fixedly sleeved on the outer ring of the material lifting barrel 400, and the outer ring of the eccentric turntable 403 is in sliding connection with the pressure expansion plate 500.
Specifically, as shown in fig. 4 and 5, in a preferred embodiment, to realize the sliding connection between the outer ring of the eccentric turntable 403 and the diffuser plate 500, the diffuser further includes:
at least two sets of supporting ring pieces 501, supporting ring piece 501 fixed mounting are in expand the clamp plate 500 inboard, and supporting ring piece 501 supports to slide and locates in the supporting ring groove 404 that the outer lane of eccentric carousel 403 seted up, and it can be understood that the eccentric carousel 403 that push-and-pull portion includes is at least two sets of equally to with two sets of supporting ring pieces 501 one-to-one, supporting ring piece 501 imbeds all the time and slides and sets up rather than corresponding in the supporting ring groove 404, consequently, can realize not influencing eccentric carousel 403 and promote the motion of expand the clamp plate 500, keep the connected state between eccentric carousel 403 and the expand clamp plate 500.
Further, in another preferred embodiment, in order to realize the sliding connection between the outer ring of the eccentric turntable 403 and the pressure expansion plate 500, a track-type supporting frame is disposed on the inner wall of the pressure expansion plate 500, the supporting frame corresponds to the eccentric turntable 403, the eccentric turntable 403 is slidably embedded in the supporting frame, and at this time, the rotating eccentric turntable 403 can drive the supporting frame to reciprocate in the horizontal direction while performing eccentric motion, so as to drive the pressure expansion plate 500 to reciprocate.
It can be understood that in the prior art, the pile expanding equipment directly utilizes the rotation of a large spiral column to take out the soil in the pile pit, the compactness of the soil in the inner wall of the pile pit is insufficient, and the firmness of a pile body is influenced, so that the pile driving equipment has a large size and poor stability after pile hole pouring.
With continuing reference to fig. 1-2, in another preferred embodiment of the present invention, the pile expanding apparatus further includes a base 200, the height-adjusting device 300 is disposed on one side of the base 200, the rotary outer cylinder 100 is rotatably disposed on a support sleeve 102, and the support sleeve 102 is connected to the height-adjusting device 300.
Further, in a preferred embodiment of the present invention, the height-adjusting device 300 includes:
a pillar installed at one side of the base 200;
the support screw rod is rotatably arranged on the upright post;
and the lifting slide block is fixedly connected with the support sleeve 102, moves on the upright post along the support screw rod, and is installed on the support screw rod in a threaded connection manner.
Preferably, a channel for accommodating the rotary outer cylinder 100 is formed in the base 200, that is, the rotary outer cylinder 100 can be rotatably inserted into the channel; the position of the channel can be in the middle of the base 200, so that the whole device is reasonable in layout, and four corners of the base 200 are respectively arranged in four directions of the rotary outer cylinder 100, so that the stability of the whole pile expanding equipment in the using process is improved.
As shown in fig. 1-2, in a preferred embodiment of the present invention, the pile expanding apparatus further includes:
and the first driving part is installed on the rotary outer cylinder 100 and is used for driving the at least two groups of lifting mechanisms to operate.
In the specific implementation of the first driving member provided in the embodiment of the present invention, in an embodiment, the first driving member is fixedly installed on the top inner wall of the rotating outer cylinder 100, of course, in another embodiment, the first driving member may also be fixedly installed on the bottom inner wall of the rotating outer cylinder 100, and it is understood that in other embodiments, the first driving member may also be installed at other positions of the rotating outer cylinder 100, which is not limited in particular.
Further, in the embodiment of the present invention, the first driving member may be a driving motor 502, the driving motor 502 is fixedly mounted on the top inner wall of the rotating outer cylinder 100, wherein the driving motor 502 is detachably mounted on the top inner wall of the rotating outer cylinder 100;
furthermore, in order to realize that the driving motor 502 drives the two sets of the material lifting barrels 400 to rotate simultaneously, in the at least two sets of the material lifting barrels 400 provided by the embodiment of the present invention, each set of the material lifting barrel 400 is provided with a driven gear ring, and the output shaft of the driving motor 502 is provided with a driving gear engaged with the driven gear ring;
it can be understood that the output shaft of the driving motor 502 has two sets of driving gears, which are respectively engaged with two sets of driven gears on the two sets of material lifting barrels 400; or the driving gears arranged on the output shaft of the driving motor 502 are a group, wherein two groups of driven gears are respectively meshed with two ends of the group of driving gears, and when one group of driving gears rotate, the two groups of material extracting barrels 400 can also rotate simultaneously.
With continued reference to fig. 1-3, the apparatus further comprises:
and a second driving member installed at one side of the support sleeve 102 for driving the rotary outer cylinder 100 to rotate.
Further, in a preferred embodiment provided by the present invention, the rotating outer cylinder 100 is rotatably installed on the supporting sleeve 102 by a second driving element, and the second driving element is installed on one side of the supporting sleeve 102.
Furthermore, in a preferred embodiment of the present invention, the second driving element is a servo motor 101, the servo motor 101 is installed at one side of the support sleeve 102, a driving gear is installed on an output shaft of the servo motor 101, and a toothed ring is fixedly installed on an outer ring of the rotary outer cylinder 100, wherein the toothed ring is engaged with the driving gear, so that the rotary outer cylinder 100 can be driven to rotate by the servo motor 101.
In another preferred embodiment of the present invention, the second driving member may also be an electric telescopic rod, and a toothed plate engaged with the toothed ring is installed at a telescopic end of the electric telescopic rod, it can be understood that, when the toothed plate is moved in the horizontal direction by using the telescopic rod, due to the engagement relationship between the toothed plate and the toothed ring, the toothed plate moving horizontally can rotate the toothed ring by a certain angle, so as to further rotate the outer rotary cylinder 100.
With continued reference to FIGS. 1 and 2, in a preferred embodiment of the present invention, the
The pile expanding apparatus further comprises:
and the third driving element is used for driving the lifting propeller 402 to rotate, the third driving element is installed on a bracket 401, and the bracket 401 is installed on the rotary outer cylinder 100.
In a specific implementation of the third driving element provided in the embodiment of the present invention, the third driving element is a motor, and the motor is configured to drive the lifting propeller 402 to rotate.
Preferably, in the embodiment of the present invention, a motor for driving the lifting screw 402 to rotate is supported by the bracket 401 at the top end of the rotary outer cylinder 100, and it is understood that there is a gap between the top of the bracket 401 and the top opening of the lifting cylinder 400, so that when the soil in the pile pit is lifted by the rotary lifting screw 402, the soil can be conveniently discharged from the top opening of the lifting cylinder 400, and the discharged soil falls onto the top plate of the rotary outer cylinder 100.
In addition, in another preferred embodiment of the present invention, the top plate of the rotary outer cylinder 100 is inclined, so that the soil dropped on the rotary outer cylinder 100 can be easily dropped, and a collection box for collecting the soil dropped on the top plate of the rotary outer cylinder 100 can be provided on the base 200.
With continued reference to fig. 1-2, in a preferred embodiment of the present invention, the pile expanding apparatus further comprises:
the four groups of moving members are respectively arranged at the four corners of the base 200, and the moving members are arranged in the embodiment of the invention, so that the whole pile expanding equipment can be conveniently pushed, namely, the pile expanding equipment can be conveniently moved to a specified position;
preferably, in an embodiment of the present invention, the moving member may be a caster, and the caster may be a self-locking caster capable of self-locking, so that the pile expanding device after moving to the designated position is stable.
Further, in another preferred embodiment provided by the embodiment of the present invention, the caster can be driven to rotate by a motor, so as to achieve the effect of saving manpower.
In summary, in the specific use of the pile expanding equipment provided in the embodiment of the present invention, on one hand, the rotating material lifting propeller 402 is utilized to take out the soil in the pile pit, and when the material lifting cylinder 400 is rotated, the eccentric turntable 403 can be driven to rotate eccentrically around the material lifting cylinder 400, and meanwhile, due to the sliding connection between the pressure expanding plate 500 and the eccentric turntable 403, the eccentrically rotating eccentric turntable 403 pushes the pressure expanding plate 500 to continuously extend out of the rotating outer cylinder or retract into the rotating outer cylinder and extend out of the pressure expanding plate 500 of the rotating outer cylinder 100, the soil in the inner wall of the pile pit can be compacted, and the soil wall can be squeezed to increase the space, and the soil can be squeezed to increase the compactness of the soil in the inner wall of the pile pit, thereby increasing the firmness of the pile body;
on the other hand, when the rotation angle of the rotating outer cylinder 100 is adjusted, the position of the pressure expansion plate 500 in the pile pit can be flexibly adjusted, so that the pressure expansion plate 500 can be aligned to different positions in the pile pit, and the inner wall of the pile pit is prevented from having compaction dead angles.
The above description is intended to be illustrative of the preferred embodiment of the present invention and should not be taken as limiting the invention, but rather, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Claims (1)

1. Pile expanding equipment for road and bridge engineering is characterized by comprising the following components:
the height of the rotary outer cylinder is adjusted through a height adjusting device;
the material lifting mechanism is rotatably arranged in the rotary outer cylinder and comprises a material lifting barrel rotatably arranged in the rotary outer cylinder, and a material lifting propeller is coaxially and rotatably arranged in the material lifting barrel; and
the material lifting mechanism is linked with the material lifting mechanism through a push-pull part, the material lifting mechanism comprises a rotary outer cylinder, and the rotary outer cylinder is connected with a material lifting mechanism;
the push-pull portion includes:
the eccentric turntable is eccentrically and fixedly sleeved on the outer ring of the material lifting barrel, and the outer ring of the eccentric turntable is connected with the pressure expanding plate in a sliding manner;
the diffuser further includes:
the support ring blocks are fixedly arranged on the inner side of the diffuser plate and are supported and slidably arranged in a support ring groove formed in the outer ring of the eccentric turntable;
the pile expanding equipment further comprises a base, the height adjusting device is arranged on one side of the base, the rotary outer cylinder is rotatably arranged on the supporting sleeve in a penetrating mode, and the supporting sleeve is connected with the height adjusting device;
the height adjusting device comprises:
the upright post is installed on one side of the base;
the supporting screw rod is rotatably arranged on the upright post; and
the lifting slide block is fixedly connected with the support sleeve, moves on the stand column along the support screw rod, and is installed on the support screw rod in a threaded connection manner;
the pile expanding apparatus further comprises:
the first driving piece is arranged on the rotary outer cylinder and used for driving the at least two groups of lifting mechanisms to operate;
the pile expanding apparatus further comprises:
the second driving piece is arranged on one side of the supporting sleeve and used for driving the rotary outer cylinder to rotate;
the pile expanding apparatus further comprises:
the third driving piece is used for driving the lifting propeller to rotate, the third driving piece is installed on a support, and the support is installed on the rotating outer barrel;
the pile expanding apparatus further comprises:
the four groups of moving parts are respectively arranged at four corners of the base;
rotatory material screw of carrying, take out the soil in the stake hole, when the messenger carries the feed cylinder rotatory, the eccentric carousel of drive is eccentric rotatory around carrying the feed cylinder, eccentric rotatory eccentric carousel promotes the diffuser plate and is continuous stretch out outside the rotatory urceolus, perhaps retract in the rotatory urceolus, stretch out the diffuser plate of rotatory urceolus, carry out the compaction to the soil of stake hole inner wall, the rotation angle of rotation urceolus is adjusted, the position of adjustment diffuser plate in the stake hole, make the diffuser plate can aim at the different positions in the stake hole.
CN202110273979.XA 2021-03-15 2021-03-15 Pile expanding equipment for road and bridge engineering Active CN113513256B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110273979.XA CN113513256B (en) 2021-03-15 2021-03-15 Pile expanding equipment for road and bridge engineering

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110273979.XA CN113513256B (en) 2021-03-15 2021-03-15 Pile expanding equipment for road and bridge engineering

Publications (2)

Publication Number Publication Date
CN113513256A CN113513256A (en) 2021-10-19
CN113513256B true CN113513256B (en) 2023-03-28

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Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102168558B (en) * 2011-04-21 2012-12-05 江苏中机矿山设备有限公司 Self-walking lifting full-hydraulic auger coal mining machine
CN105113488B (en) * 2015-08-12 2017-05-03 河海大学 Construction method of multi-head minor-diameter long-spiral drilling machine in cast-in-situ major-diameter tubular pile
CN107143288B (en) * 2017-07-13 2023-07-21 广东水电二局股份有限公司 Drilling tool constraint and dregs isolation device
CN109083591B (en) * 2018-08-20 2021-04-02 中铁二十局集团有限公司 Drilling bored concrete pile body and pile cap integrated drilling pore-forming method
CN112196469B (en) * 2020-10-20 2021-07-13 长沙市市政工程有限责任公司 Pile expanding equipment for bridge pile foundation

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