CN114109279A - Pore-forming device and pore-forming method for concrete drilling cast-in-place threaded pile - Google Patents

Pore-forming device and pore-forming method for concrete drilling cast-in-place threaded pile Download PDF

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CN114109279A
CN114109279A CN202111583188.3A CN202111583188A CN114109279A CN 114109279 A CN114109279 A CN 114109279A CN 202111583188 A CN202111583188 A CN 202111583188A CN 114109279 A CN114109279 A CN 114109279A
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rod
threaded
wall
core rod
pile
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CN114109279B (en
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王荔
程德金
杨凯
陈卫强
张晓辉
屠丹
钱程
王菲
李冬晖
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Northwest Civil Aviation Airport Construction Group Co ltd
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    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/22Rods or pipes with helical structure
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22Piles
    • E02D5/34Concrete or concrete-like piles cast in position ; Apparatus for making same
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22Piles
    • E02D5/56Screw piles
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00Special methods or apparatus for drilling
    • E21B7/28Enlarging drilled holes, e.g. by counterboring
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2200/00Geometrical or physical properties
    • E02D2200/16Shapes
    • E02D2200/1671Shapes helical or spiral
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2250/00Production methods
    • E02D2250/0061Production methods for working underwater
    • E02D2250/0076Drilling

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Structural Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
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  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
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  • Geochemistry & Mineralogy (AREA)
  • Mechanical Engineering (AREA)
  • Piles And Underground Anchors (AREA)

Abstract

一种混凝土钻孔灌注螺纹桩的成孔装置及成孔方法,包括中芯杆、套杆、套杆螺纹壁、套杆螺纹壁驱动装置、中芯杆螺纹壁和中芯杆螺纹壁驱动装置;套杆套设在中芯杆上,套杆能够沿着中芯杆轴向滑动;套杆螺纹壁设置在套杆外侧,套杆和套杆螺纹壁之间通过套杆螺纹壁驱动装置连接;中芯杆螺纹壁设置在中芯杆外侧,中芯杆螺纹壁和中芯杆之间通过中芯杆螺纹壁驱动装置连接;套杆螺纹壁和中芯杆螺纹壁能够围成完整的螺纹柱。本发明在钻孔灌注桩施工过程中,在常规直壁钻孔灌注桩成孔后,将孔壁挤压形成螺纹状,增大桩与土之间的侧摩阻力,从而达到在桩径不变的前提下,提高桩基承载力,或者相同承载力要求时,可以缩小桩径或桩长,实现节约工程造价的目的。

Figure 202111583188

A hole-forming device and a hole-forming method for a concrete bored cast-in-place threaded pile, comprising a center core rod, a sleeve rod, a sleeve rod threaded wall, a sleeve rod threaded wall driving device, a center core rod threaded wall and a center core rod threaded wall driving device ; The sleeve rod is sleeved on the central core rod, and the sleeve rod can slide axially along the central core rod; ; The threaded wall of the central core rod is arranged on the outside of the central core rod, and the threaded wall of the central core rod and the central core rod are connected by a driving device of the threaded wall of the central core rod; the threaded wall of the sleeve rod and the threaded wall of the central core rod can form a complete thread column. In the present invention, during the construction of the bored pile, after the conventional straight-wall bored pile is formed into a hole, the hole wall is extruded to form a thread shape, so as to increase the lateral frictional resistance between the pile and the soil, so as to achieve a different diameter of the pile. Under the premise of changing, the bearing capacity of the pile foundation can be improved, or when the same bearing capacity is required, the diameter or length of the pile can be reduced to achieve the purpose of saving the project cost.

Figure 202111583188

Description

Pore-forming device and pore-forming method for concrete drilling cast-in-place threaded pile
Technical Field
The invention relates to the field of cast-in-situ bored piles in pile foundation engineering, in particular to a pore-forming device and a pore-forming method for a concrete cast-in-situ bored threaded pile.
Background
The cast-in-situ bored pile in the pile foundation engineering is divided into an end bearing pile and a friction pile according to the stress characteristics, and the bearing capacity of the end bearing pile mainly comes from the resistance of a solid soil layer or bedrock at the pile end; the bearing capacity of the friction pile mainly comes from the side friction between the pile body and the soil. After the cast-in-situ bored pile is formed into a hole, the hole wall is extruded to form a thread shape, so that the side friction between the pile and the soil is improved, and the bearing capacity of the friction pile can be improved. The current concrete screw pile is mainly a precast pile, and is extruded into a soil body by applying torque on a pile body, the torque which can be borne by the pile body is limited by the strength of concrete, and the pile diameter and the pile length are relatively small.
Disclosure of Invention
The invention aims to provide a hole forming device and a hole forming method for a concrete drilling and pouring threaded pile, so as to solve the problems.
In order to achieve the purpose, the invention adopts the following technical scheme:
a pore-forming device for a concrete drilling cast-in-place threaded pile comprises a middle core rod, a sleeve rod threaded wall driving device, a middle core rod threaded wall and a middle core rod threaded wall driving device; the sleeve rod is sleeved on the central core rod and can axially slide along the central core rod; the sleeve rod thread wall is arranged on the outer side of the sleeve rod, and the sleeve rod thread wall are connected through a sleeve rod thread wall driving device; the middle core rod thread wall is arranged on the outer side of the middle core rod, and the middle core rod thread wall and the middle core rod are connected through a middle core rod thread wall driving device; the sleeve rod thread wall and the middle core rod thread wall can be enclosed into a complete thread column.
Furthermore, the loop bar threaded wall driving device comprises four loop bar bidirectional hydraulic oil cylinders which are equally divided into two groups and symmetrically arranged on two sides of the loop bar, and output ends of the loop bar bidirectional hydraulic oil cylinders are connected to the loop bar threaded wall.
Furthermore, the output directions of the two loop bar bidirectional hydraulic oil cylinders on the same side are intersected; two ends of the loop bar bidirectional hydraulic oil cylinder are respectively hinged with the loop bar and the loop bar thread wall.
Furthermore, the driving device for the threaded wall of the center core rod comprises four center core rod bidirectional hydraulic cylinders, the four center core rod bidirectional hydraulic cylinders are divided into two groups and symmetrically arranged on two sides of the center core rod, and the output ends of the center core rod bidirectional hydraulic cylinders are connected to the threaded wall of the center core rod.
Furthermore, the output directions of the two-way hydraulic oil cylinders of the two center core rods on the same side are intersected; two ends of the two-way hydraulic cylinder of the central core rod are respectively hinged with the threaded wall of the central core rod and the threaded wall of the central core rod.
Furthermore, two symmetrical axial grooves are formed in the side wall of the loop bar, and a limiting cap is arranged at one end of the loop bar.
Furthermore, the middle part of the central core rod is provided with a limiting block matched with the limiting cap.
Furthermore, the sleeve rod thread wall and the middle core rod thread wall are both two thread walls with the same structure, and when the limiting cap is contacted with the limiting block, the two sleeve rod thread walls and the two middle core rod thread walls enclose a complete thread column.
Further, the thread of the threaded post surface is a continuous thread.
Further, a hole forming method of the concrete bored screw pile comprises the following steps:
lifting the sleeve rod to make the thread wall of the sleeve rod and the thread wall of the central core rod staggered up and down;
the bidirectional hydraulic cylinder is contracted to enable the threaded wall of the sleeve rod and the threaded wall of the central core rod to be in a folded state;
after a conventional straight-wall cast-in-place pile hole is formed, the device is put to the bottom of the hole or a set depth position, and the inner diameter of the selected device is the same as the aperture of the conventional cast-in-place pile hole;
extending the two-way hydraulic oil cylinder on the middle core rod to ensure that the threaded wall of the middle core rod is unfolded under the action of the upper and lower guide grooves and the hydraulic oil cylinder;
lowering the sleeve rod to the bottom to expand the threaded wall of the sleeve rod under the action of the upper and lower guide grooves and the hydraulic oil cylinder to form an integral structure together with the threaded wall of the central core rod;
the pile is rotated and lifted upwards along the thread direction, and the rotation and lifting speed is ensured to ensure that the threads formed on the hole wall and the soil body around the pile do not generate vertical relative displacement;
when the pile rotates and is lifted to the hole opening or the set height, the sleeve rod thread wall is firstly folded and lifted, then the central core rod thread wall is folded, and finally the pile hole is lifted, so that the hole forming work of the concrete cast-in-situ bored pile is completed.
Compared with the prior art, the invention has the following technical effects:
the loop bar can move up and down on the central core bar, the loop bar thread wall is connected with the loop bar through the bidirectional hydraulic oil cylinder, the central core bar thread wall is connected with the central core bar through the bidirectional hydraulic oil cylinder, and the folding and the extension of the thread wall are realized through the expansion of the hydraulic oil cylinder and the restriction of the guide grooves on the central core bar and the loop bar. In the construction process of the cast-in-situ bored pile, after the conventional straight-wall cast-in-situ bored pile is formed into a hole, the device is adopted to be lifted to the hole opening from the bottom of the pile hole in a rotating mode, a thread-shaped structure is formed on the hole wall, and the side friction between the pile and the soil is increased, so that the bearing capacity of a pile foundation is improved on the premise that the pile diameter is not changed, or the pile diameter or the pile length can be reduced when the requirement of the bearing capacity is met, and the purpose of saving the construction cost is achieved.
Drawings
FIG. 1 is a general schematic of the present invention;
FIG. 2 is an isometric view of a loop bar
FIG. 3 is a perspective view of a mandrel
FIG. 4 is a combination view of a loop bar and a center bar
FIG. 5 is an isometric view of a threaded wall of a loop bar
FIG. 6 is an isometric view of the threaded wall of the core rod
FIG. 7 is a schematic representation of a process: complete folding of the device
FIG. 8 in use: center pin threaded wall extension
FIG. 9 shows the device about to fully extend during use
Figure 10 full extension of the device during use
Wherein: 1, a central core rod; 2, sleeving a rod; 3, a sleeve rod thread wall; 4, a loop bar bidirectional hydraulic oil cylinder; 5 a core rod threaded wall; 6, a two-way hydraulic oil cylinder of the central core rod; 11, a limiting cap; 21 a limiting block.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
referring to fig. 1 to 9, an object of the present invention is to provide a hole forming device and a hole forming method for a concrete bored and cast-in-place screw pile, which can improve bearing capacity without changing pile diameter and pile length, or can reduce pile diameter and pile length reasonably while satisfying the requirement of bearing capacity, thereby saving construction cost.
The invention adopts the following technical scheme: the pore-forming device comprises a central core rod, a loop bar thread wall, a central core rod thread wall, an underwater bidirectional hydraulic oil cylinder and other main components, wherein the loop bar can move up and down on the central core rod, the loop bar thread wall is connected with the loop bar through the bidirectional hydraulic oil cylinder, the central core rod thread wall is connected with the central core rod through the bidirectional hydraulic oil cylinder, and the gathering and the extension of the thread wall are realized through the extension and the contraction of the hydraulic oil cylinder and the restriction of guide grooves on the central core rod and the loop bar.
The invention relates to a hole forming device and a method for a concrete bored pile, which are shown in figure 1, in the construction process, on the basis of the hole forming of a conventional bored pile, the device is folded, put to the bottom of a hole, extended at the bottom of the hole, rotated and lifted to a pile mouth or a set height, the hole wall of a cylindrical surface is extruded into a thread shape, in the process, the rotation and lifting speed are required to ensure that screw threads formed on the hole wall and the soil body around the pile do not generate vertical relative displacement, and after the hole is lifted out of an orifice by rotation, a steel reinforcement cage is put down to pour concrete or the concrete is directly poured to form the concrete threaded pile.
The method of use of the present invention is described in further detail below:
in the concrete drilling and pouring process of the screw pile, the concrete method using the device is as follows:
firstly, lifting a sleeve rod of the device to enable the thread wall of the sleeve rod and the thread wall of the central core rod to be staggered up and down;
contracting the bidirectional hydraulic cylinder to enable the sleeve rod thread wall and the central core rod thread wall to be in a furled state;
thirdly, after the conventional straight-wall cast-in-place pile hole is formed, the device is put down to the bottom of the hole or a set depth, and the inner diameter of the selected device is the same as the aperture of the conventional cast-in-place pile; the inner diameter of the device is selected to be the diameter of the cylinder formed after the threads are removed.
Fourthly, stretching the two-way hydraulic oil cylinder on the middle core rod to enable the threaded wall of the middle core rod to be unfolded under the action of the upper and lower guide grooves and the hydraulic oil cylinder;
lowering the sleeve rod to the bottom to expand the threaded wall of the sleeve rod under the action of the upper and lower guide grooves and the hydraulic oil cylinder to form an integral structure together with the threaded wall of the middle core rod;
sixthly, the pile head rotates upwards along the direction of the thread and is lifted, and the rotation and lifting speed ensures that the thread formed on the hole wall and the soil body around the pile do not generate vertical relative displacement;
and seventhly, when the pile is rotated and lifted to an orifice or a set height, the threaded wall of the sleeve rod is firstly folded, the sleeve rod is lifted, then the threaded wall of the central core rod is folded, and finally the pile hole is lifted out, so that the hole forming work of the concrete drilling and pouring threaded pile is completed.

Claims (10)

1.一种混凝土钻孔灌注螺纹桩的成孔装置,其特征在于,包括中芯杆(1)、套杆(2)、套杆螺纹壁(3)、套杆螺纹壁驱动装置、中芯杆螺纹壁(5)和中芯杆螺纹壁驱动装置;套杆(2)套设在中芯杆(1)上,套杆(2)能够沿着中芯杆(1)轴向滑动;套杆螺纹壁(3)设置在套杆(2)外侧,套杆(2)和套杆螺纹壁(3)之间通过套杆螺纹壁驱动装置连接;中芯杆螺纹壁(5)设置在中芯杆(1)外侧,中芯杆螺纹壁(5)和中芯杆(1)之间通过中芯杆螺纹壁驱动装置连接;套杆螺纹壁(3)和中芯杆螺纹壁(5)能够围成完整的螺纹柱。1. A hole-forming device for a concrete bored threaded pile, characterized in that it comprises a core rod (1), a casing rod (2), a casing rod threaded wall (3), a casing rod threaded wall driving device, a core rod A rod threaded wall (5) and a driving device for the central rod threaded wall; the sleeve rod (2) is sleeved on the center rod (1), and the sleeve rod (2) can slide axially along the center rod (1); the sleeve The rod threaded wall (3) is arranged on the outer side of the sleeve rod (2), and the sleeve rod (2) and the sleeve rod threaded wall (3) are connected by a sleeve rod threaded wall driving device; the central core rod threaded wall (5) is arranged in the middle On the outside of the core rod (1), the central core rod threaded wall (5) and the central core rod (1) are connected by a central core rod threaded wall driving device; the sleeve rod threaded wall (3) and the central core rod threaded wall (5) Capable of enclosing a complete threaded column. 2.根据权利要求1所述的一种混凝土钻孔灌注螺纹桩的成孔装置,其特征在于,套杆螺纹壁驱动装置包括四个套杆双向液压油缸,四个套杆双向液压油缸均分为两组,对称设置在套杆(2)的两侧,套杆双向液压油缸的输出端连接在套杆螺纹壁(3)上。2 . The hole-forming device for a concrete bored threaded pile according to claim 1 , wherein the threaded wall driving device for sleeve rods comprises four bidirectional hydraulic oil cylinders for sleeve rods, and the four bidirectional hydraulic oil cylinders for sleeve rods are divided into equal parts. 3 . There are two groups, which are symmetrically arranged on both sides of the sleeve rod (2), and the output end of the sleeve rod bidirectional hydraulic cylinder is connected to the sleeve rod threaded wall (3). 3.根据权利要求2所述的一种混凝土钻孔灌注螺纹桩的成孔装置,其特征在于,相同一侧的两个套杆双向液压油缸输出方向相交;套杆双向液压油缸的两端分别与套杆(2)和套杆螺纹壁(3)铰接。3. The hole-forming device for a concrete bored threaded pile according to claim 2, wherein the output directions of the two bidirectional hydraulic cylinders on the same side intersect; the two ends of the bidirectional hydraulic cylinders are respectively It is hinged with the sleeve rod (2) and the sleeve rod threaded wall (3). 4.根据权利要求1所述的一种混凝土钻孔灌注螺纹桩的成孔装置,其特征在于,中芯杆螺纹壁驱动装置包括四个中芯杆双向液压油缸,四个中芯杆双向液压油缸均分为两组,对称设置在中芯杆(1)的两侧,中芯杆双向液压油缸的输出端连接在中芯杆螺纹壁(5)上。4 . The hole-forming device for a concrete bored threaded pile according to claim 1 , wherein the threaded wall driving device for the central core rod comprises four central core rod bidirectional hydraulic oil cylinders, and four central core rod bidirectional hydraulic The oil cylinders are divided into two groups, which are symmetrically arranged on both sides of the center rod (1), and the output ends of the two-way hydraulic oil cylinders of the center rod are connected to the threaded wall (5) of the center rod. 5.根据权利要求4所述的一种混凝土钻孔灌注螺纹桩的成孔装置,其特征在于,相同一侧的两个中芯杆双向液压油缸输出方向相交;中芯杆双向液压油缸的两端分别与中芯杆(1)和中芯杆螺纹壁(5)铰接。5. A hole-forming device for a concrete bored threaded pile according to claim 4, wherein the output directions of the two center rod bidirectional hydraulic cylinders on the same side intersect; The ends are respectively hinged with the central core rod (1) and the central core rod threaded wall (5). 6.根据权利要求1所述的一种混凝土钻孔灌注螺纹桩的成孔装置,其特征在于,套杆(2)侧壁上开设有两个对称的轴向槽,套杆(2)的一端设置有限位帽(21)。6. The hole-forming device of a concrete bored threaded pile according to claim 1, wherein two symmetrical axial grooves are provided on the side wall of the sleeve rod (2), and the One end is provided with a limiting cap (21). 7.根据权利要求6所述的一种混凝土钻孔灌注螺纹桩的成孔装置,其特征在于,中芯杆(1)中部设置有和限位帽相匹配的限位块(11)。7 . The hole forming device for concrete bored threaded piles according to claim 6 , wherein a limit block ( 11 ) matched with the limit cap is provided in the middle of the core rod ( 1 ). 8 . 8.根据权利要求7所述的一种混凝土钻孔灌注螺纹桩的成孔装置,其特征在于,套杆螺纹壁(3)和中芯杆螺纹壁(5)均为两块结构相同的螺纹壁,限位帽和限位块(11)相接触时,两块套杆螺纹壁(3)和两块中芯杆螺纹壁(5)围成完整的螺纹柱。8 . The hole-forming device for a concrete bored threaded pile according to claim 7 , wherein the sleeve rod threaded wall (3) and the central core rod threaded wall (5) are two threads with the same structure. 9 . When the wall, the limit cap and the limit block (11) are in contact, the two sleeve rod threaded walls (3) and the two central core rod threaded walls (5) enclose a complete threaded column. 9.根据权利要求1所述的一种混凝土钻孔灌注螺纹桩的成孔装置,其特征在于,螺纹柱表面的螺纹为连续螺纹。9 . The hole-forming device for concrete bored threaded piles according to claim 1 , wherein the thread on the surface of the threaded column is a continuous thread. 10 . 10.一种混凝土钻孔灌注螺纹桩的成孔方法,其特征在于,基于权利要求1至9任意一项所述的混凝土钻孔灌注螺纹桩的成孔装置,包括以下步骤:10. A method for forming a hole for a concrete bored threaded pile, characterized in that, based on the hole forming device for a concrete bored threaded pile according to any one of claims 1 to 9, the method comprises the following steps: 套杆上提,使套杆螺纹壁与中芯杆螺纹壁上下错开;The sleeve rod is lifted up, so that the threaded wall of the sleeve rod and the threaded wall of the core rod are staggered up and down; 收缩双向液压缸使套杆螺纹壁与中芯杆螺纹壁处于收拢状态;Retract the two-way hydraulic cylinder so that the threaded wall of the sleeve rod and the threaded wall of the central rod are in a retracted state; 在常规的直壁钻孔灌注桩桩孔成型后,将该装置下放至孔底或设定深度处,所选装置的内径应与常规钻孔灌注桩孔径相同;After the conventional straight wall bored pile hole is formed, the device is lowered to the bottom of the hole or at the set depth, and the inner diameter of the selected device should be the same as that of the conventional bored pile; 伸展中芯杆上双向液压油缸,使中芯杆螺纹壁在上下导槽和液压油缸的作用下展开;Extend the two-way hydraulic cylinder on the core rod, so that the threaded wall of the core rod can be expanded under the action of the upper and lower guide grooves and the hydraulic cylinder; 将套杆下放至底部,使套杆螺纹壁在上下导槽和液压油缸的作用下展开,与中芯杆螺纹壁形成整体结构;Lower the sleeve rod to the bottom, so that the threaded wall of the sleeve rod is unfolded under the action of the upper and lower guide grooves and the hydraulic cylinder to form an integral structure with the threaded wall of the central core rod; 顺着螺纹方向向上旋转并提升,旋转与提升速度应保证孔壁形成的螺牙与桩周土体不产生竖向的相对位移;Rotate and lift up along the thread direction. The speed of rotation and lifting should ensure that the screw teeth formed by the hole wall and the soil around the pile do not produce vertical relative displacement; 旋转并提升至孔口或设定高度时,先收拢套杆螺纹壁并提升套杆,再收拢中芯杆螺纹壁,最后提出桩孔,完成混凝土钻孔灌注螺纹桩的成孔工作。When rotating and lifting to the orifice or the set height, first close the threaded wall of the sleeve rod and lift the sleeve rod, then close the threaded wall of the center rod, and finally lift the pile hole to complete the hole forming of the concrete bored threaded pile.
CN202111583188.3A 2021-12-22 2021-12-22 A hole forming device and a hole forming method for concrete bored cast-in-place threaded pile Active CN114109279B (en)

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CN112404528A (en) * 2020-11-19 2021-02-26 王朋 Threaded hole drill bit
CN112761139A (en) * 2021-01-08 2021-05-07 刘守进 Cast-in-place pile with diameter-expanding conical pile section, drill bit for pile forming and pile forming construction method
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CN2057457U (en) * 1989-02-28 1990-05-23 陈士华 Improved rotary driller
CN1851152A (en) * 2006-05-11 2006-10-25 黑龙江博施建筑工程技术开发有限公司 Long-spiral drilling machine screw-thread pile piling device and method
CN103556625A (en) * 2013-10-27 2014-02-05 海南卓典高科技开发有限公司 Complex squeezed pile forming construction method and complex squeezed pile forming device
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CN112404528A (en) * 2020-11-19 2021-02-26 王朋 Threaded hole drill bit
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