CN114526013B - A rotary cutting and extrusion device for static pressure bottom expansion piles in loess areas and a construction method thereof - Google Patents
A rotary cutting and extrusion device for static pressure bottom expansion piles in loess areas and a construction method thereof Download PDFInfo
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- CN114526013B CN114526013B CN202210029240.9A CN202210029240A CN114526013B CN 114526013 B CN114526013 B CN 114526013B CN 202210029240 A CN202210029240 A CN 202210029240A CN 114526013 B CN114526013 B CN 114526013B
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- 238000010276 construction Methods 0.000 title claims abstract description 29
- 230000003068 static effect Effects 0.000 title claims abstract description 14
- 238000001125 extrusion Methods 0.000 title claims description 19
- 238000003825 pressing Methods 0.000 claims abstract description 21
- 239000002689 soil Substances 0.000 claims description 30
- 238000000034 method Methods 0.000 claims description 21
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 18
- 238000004140 cleaning Methods 0.000 claims description 8
- 239000007921 spray Substances 0.000 claims description 7
- 239000002002 slurry Substances 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000006116 polymerization reaction Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 4
- 238000005553 drilling Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 239000013049 sediment Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 229940099259 vaseline Drugs 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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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
- E21B7/28—Enlarging drilled holes, e.g. by counterboring
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
- E02D5/44—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds with enlarged footing or enlargements at the bottom of the pile
-
- 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
- E21B10/00—Drill bits
- E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
- E21B10/32—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools
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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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
- E21B33/138—Plastering the borehole wall; Injecting into the formation
-
- 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
- E21B7/30—Enlarging drilled holes, e.g. by counterboring without earth removal
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- Structural Engineering (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Geochemistry & Mineralogy (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Mechanical Engineering (AREA)
- Piles And Underground Anchors (AREA)
Abstract
本发明公开了一种黄土地区静压扩底桩旋切挤扩装置及其施工方法，包括模具桩，模具桩由多个直桩单元筒和旋切扩底模具组成，直桩单元筒底部的直桩筒内设置有电机和环形导轨，旋切扩底模具包括四片曲面旋切刀片，四片曲面旋切刀片形成倒圆锥形桩尖，倒圆锥形桩尖的顶部与环形导轨通过合页铰接；曲面旋切刀片上固定有液压杆，液压杆的输出端伸向曲面旋切刀片的内壁，液压杆的非顶进端部固定在支座上，电机的转轴固定在支座的中心位置。采用静压扩底桩旋切挤扩装置进行直桩压桩和扩大端成孔施工，实现机械化、标准化扩底桩成孔，降低扩大端的施工风险，且随着桩模具的压入和旋切挤扩使得桩周黄土得到有效挤密，降低桩周黄土湿陷性，提高单桩承载力。
The invention discloses a rotary cutting and extruding device for static pressure bottom expansion piles in loess areas and a construction method thereof, comprising a mold pile, the mold pile is composed of a plurality of straight pile unit tubes and a rotary cutting and bottom expansion mold, a motor and an annular guide rail are arranged in the straight pile tube at the bottom of the straight pile unit tube, and the rotary cutting and bottom expansion mold comprises four curved surface rotary cutting blades, the four curved surface rotary cutting blades form an inverted conical pile tip, the top of the inverted conical pile tip is hinged to the annular guide rail through a hinge; a hydraulic rod is fixed on the curved surface rotary cutting blade, the output end of the hydraulic rod extends to the inner wall of the curved surface rotary cutting blade, the non-jacking end of the hydraulic rod is fixed on a support, and the rotating shaft of the motor is fixed at the center of the support. The static pressure bottom expansion pile rotary cutting and extruding device is used to carry out straight pile pressing and expansion end hole forming construction, so as to realize mechanized and standardized bottom expansion pile hole forming, reduce the construction risk of the expansion end, and with the pressing in of the pile mold and rotary cutting and extruding, the loess around the pile is effectively compacted, the collapsibility of the loess around the pile is reduced, and the bearing capacity of the single pile is improved.
Description
Technical Field
The invention belongs to the technical field of pedestal pile equipment, and particularly relates to a rotary-cut extrusion-expansion device for a static-pressure pedestal pile in a loess area and a construction method thereof.
Background
The construction method of the club-footed pile mainly comprises two types of drilling and grouting club-footed pile and high-pressure jet grouting club-footed pile, wherein the former type of construction process is complex and has large disturbance on soil around a drilling hole, the latter type of construction process can ensure jet grouting while club-footed, but errors caused in the construction process are large, construction noise, slurry and the like have large environmental pollution, and the slurry water is immersed in a collapsible yellow soil layer to increase the negative friction resistance of the pile side, so that the bearing performance of the pile foundation is influenced. The static pressure method is adopted to construct the club-footed pile, which can effectively solve the problems, but when the prefabricated club-footed pile is adopted to construct, the existence of the enlarged end is difficult to construct directly by the static pressure method, so the design of the rotary-cut extrusion-expansion device for the static pressure club-footed pile in loess areas is particularly important.
Disclosure of Invention
The invention aims to provide a rotary-cut squeezing device for a static-pressure pedestal pile in a loess area, which can effectively squeeze loess around the pile, thereby reducing the collapsibility of the loess.
The invention further aims to provide a construction method of the rotary-cut extrusion-expansion device for the static-pressure pedestal pile in the loess area.
The technical scheme includes that the rotary-cut extrusion device for the static-pressure pedestal pile in loess areas comprises a die pile, wherein the die pile consists of a plurality of straight pile unit barrels connected through threads and an enlarged end rotary-cut structure, a motor is arranged in each straight pile barrel at the bottom of each straight pile unit barrel, an annular guide rail is arranged at the bottom end of each straight pile barrel, each enlarged end rotary-cut structure comprises four curved rotary-cut blades, the four curved rotary-cut blades are enclosed together to form an inverted conical pile tip, the top of each inverted conical pile tip is hinged with the annular guide rail through an arc hinge, each curved rotary-cut blade is fixedly provided with a hydraulic rod, the output end of each hydraulic rod extends to the inner wall of each curved rotary-cut blade, the non-jacking ends of the four hydraulic rods are all fixed on a support, and the bottom end of a motor rotating shaft of the motor is fixed at the center of the support.
The present invention is also characterized in that,
The motor is fixed on the inner wall of the straight pile cylinder through a bracket.
The invention adopts another technical scheme that the construction method of the rotary-cut extrusion-expansion device for the static-pressure pedestal pile in loess areas comprises the following steps:
Step 1, burying pile casings at the determined pile positions, pressing part of die pile bodies after screwing into foundation soil by using a holding press, stopping pressing when the pile height above the ground, which is not pressed into the soil, is suitable for screwing a straight pile unit cylinder, performing screwing operation, alternately performing screwing and pressing, repeating the construction process until the pressed pile length reaches the design requirement, stopping screwing and pressing of the straight pile cylinder, and finishing the pore-forming operation of the straight pile section;
Step 2, simultaneously outputting and jacking four output ends of the hydraulic rod, pushing the four curved rotary cutting blades to squeeze and expand in four directions until the designed bottom expanding angle requirement is met, controlling the hydraulic rod to shrink slowly after preliminary support, enabling the four curved rotary cutting blades to polymerize inwards by shrinkage of the hydraulic rod to form a conical pile tip form, and completing soil extrusion for the first time;
After polymerization is completed, enabling the four curved surface rotary-cut blades to horizontally rotate by a certain angle, enabling the motor 3 to drive the four curved surface rotary-cut blades to rotate along the annular guide rail, extruding soil again after rotating by a certain angle, keeping the telescopic length of the hydraulic rod unchanged when the four curved surface rotary-cut blades reach the designed extrusion and expansion angle after final soil extrusion in the ending stage, namely keeping the bottom expansion angle unchanged, starting the motor, driving the four curved surface rotary-cut blades to horizontally rotate along the annular guide rail through transmission of the rotating shaft and the hydraulic rod, and rotary-cutting the unextruded soil body to enable the expansion head to form a round-table-like body space, and completing bottom expansion operation;
And 4, after the bottom expansion is finished, the rotary spray head and the slurry conveying guide pipe are lowered to the bottom of the mould pile, the length of the hydraulic rod is contracted to drive all curved rotary cutting blades to be polymerized inwards, then the straight pile cylinder above the ground is slowly pulled out and disassembled, hole cleaning operation is carried out after the mould pile is completely pulled out, pouring operation is carried out after hole cleaning is finished, a vibration and pouring method is adopted, after pouring is finished, the pile cylinder at the orifice position is withdrawn, and the construction of pouring the bottom expansion pile by the static pressure mould is finished.
The invention has the beneficial effects that the pedestal pile constructed by adopting the pedestal mould to carry out the static pressure method achieves the aims of pile pressing and pore forming, and the loess around the pile is effectively compacted along with the pressing of the pile mould, so that the collapsibility is reduced, and the bearing capacity of a single pile is improved. The enlarging end rotary cutting tool is adopted to carry out enlarging end pore-forming, so that the risk of manual construction of the enlarging end can be reduced, the mechanized and standardized enlarging end generation is realized, the mould can be withdrawn for secondary use after pore-forming, and the engineering cost is reduced. Due to the rotary cutting and squeezing functions, the soil around the piles falls less, the workload of hole cleaning is reduced, the construction process is simpler, and the construction efficiency is improved.
Drawings
FIG. 1 is a schematic view of a mold pile of a rotary-cut extrusion-expansion device for a static-pressure pedestal pile in loess areas;
FIG. 1-1 is a schematic structural view of a straight pile drum in a rotary-cut extrusion-expansion device for a static-pressure club-footed pile in a loess area;
Fig. 1-2 are schematic structural views of a bottom straight pile drum in a loess area static pressure club-footed pile rotary-cut squeezing and expanding device of the invention;
FIG. 2 is a schematic extrusion view of a rotary-cut extrusion-expansion device for a static-pressure pedestal pile in loess areas;
FIG. 3 is a schematic view of the structure of a hydraulic rod in a rotary-cut extrusion-expansion device for a static-pressure pedestal pile in loess areas;
FIG. 4 is a schematic view of a curved surface rotary-cut blade in a loess area hydrostatic pedestal pile rotary-cut extrusion device according to the present invention;
FIG. 5 is a schematic rotation view of rotary cutter blades in a rotary-cut extrusion-expansion device for a static-pressure pedestal pile in loess areas;
FIG. 6 is a schematic diagram of a rotary-cut squeezing and expanding device for a static-pressure pedestal pile in loess areas for squeezing and expanding operation;
FIG. 7 is a diagram showing the effect of the rotary-cut extrusion and expansion device for the static-pressure pedestal pile in loess areas;
fig. 8 is a rotary cutting schematic diagram of a rotary cutting extrusion device for a static pressure pedestal pile in a loess area.
In the figure, a straight pile unit cylinder 1, a straight pile cylinder 2, a motor 3, a rotary shaft 4, a hydraulic rod 5, a curved surface rotary cutting blade 6 and an annular guide rail 7.
Detailed Description
The invention will be described in detail below with reference to the drawings and the detailed description.
The invention relates to a rotary-cut extrusion-expansion device for a static-pressure club-footed pile in a loess area, which is shown in fig. 1 and is a whole outline schematic diagram of a mould pile, wherein the mould pile consists of a plurality of straight pile unit barrels 1 which are shown in fig. 1-1 and can be screwed up and connected together through screw threads, and the rotary-cut club-footed pile is shown in fig. 1-2. Wherein the straight pile unit barrels 1 meet different pile length design requirements by screwing different numbers of straight pile barrels 2. The motor 3 is arranged inside the straight pile cylinder 2 positioned at the bottom of the straight pile unit cylinder 1, and the motor 3 is fixed on the inner wall of the straight pile cylinder 2 through a bracket.
As shown in fig. 2-4, the bottom end of the straight pile barrel 2 is provided with an annular guide rail 7, the expansion end rotary cutting structure comprises four curved rotary cutting blades 6, the four curved rotary cutting blades 6 are surrounded together to form an inverted conical pile tip, the top of the inverted conical pile tip is hinged with the annular guide rail 7 through an arc hinge, each curved rotary cutting blade 6 is fixedly provided with a hydraulic rod 5, the output end of the hydraulic rod 5 extends to the inner wall of the curved rotary cutting blade 6, the non-jacking end parts of the four hydraulic rods 5 are fixedly arranged on a support, the bottom end of a rotating shaft 4 of the motor 3 is fixedly arranged at the center of the support, the extrusion principle is as shown in fig. 2, the four output ends of the hydraulic rods 5 simultaneously output jacking, and the extrusion and expansion of the four curved rotary cutting blades 6 are pushed outwards when cutting soil bodies, so that the expansion end rotary cutting generation and soil extrusion actions are completed.
The rotation principle is shown in fig. 5, the motor 3 provides rotation force to drive the rotating shaft 4 to rotate, the bottom end of the rotating shaft 4 is welded and fixed with the support, and the motor 3 drives the four curved surface rotary cutting blades 6 to rotate along the annular guide rail 7 during cutting so as to realize rotary cutting and squeezing operation on soil bodies in different angle areas.
Burying pile casings at the determined pile positions, pressing part of the die pile bodies after screwing into foundation soil by using a holding press, stopping pressing when the pile height above the ground, which is not pressed into the soil, is suitable for a worker to screw a straight pile cylinder, stopping pressing, performing screwing operation by the worker, performing screwing and pressing alternately, repeating the construction process until the pressed pile length reaches the design requirement, stopping screwing and pressing the straight pile cylinder, and finishing the pore-forming operation of the straight pile section.
As shown in fig. 6, after the hole forming operation of the straight pile section is completed, the pile length reaches the design requirement, and the bottom expanding operation is performed. The extrusion and expansion principle is shown in fig. 2, and the four output ends of the hydraulic rod 5 are simultaneously output and jacked in to push the four curved rotary cutting blades 6 to extrude and expand in four directions until the designed bottom expansion angle requirement is met, as shown in fig. 7. After preliminary support is carried out, the hydraulic rod 5 is controlled to slowly shrink, the hydraulic rod 5 shrinks to drive the four curved rotary cutting blades 6 to polymerize inwards, a conical pile tip form is formed, and the first soil extrusion is completed.
After polymerization, the four curved surface rotary-cut blades 6 are horizontally rotated for a certain angle, the rotation principle is shown in fig. 5, the motor 3 provides rotation force to drive the rotating shaft 4 to rotate, the bottom end of the rotating shaft 4 is welded and fixed with the support, so that the motor 3 drives the four curved surface rotary-cut blades 6 to rotate along the annular guide rail 7, after rotating for a certain angle, soil squeezing is carried out again, the principle of squeezing and expanding is the same as that of the first soil squeezing and expanding process, the soil squeezing and expanding process can be carried out for multiple times according to the good and bad degree of reaming, and the soil squeezing and expanding process is carried out symmetrically and orderly as much as possible, so that the squeezed and expanded space is symmetrically and uniformly distributed.
After the soil is squeezed for the last time, as shown in fig. 8, when the four curved surface rotary cutting blades 6 reach the designed squeezing and expanding angle, the telescopic length of the hydraulic rod 5 is kept unchanged, namely, the expanding angle is kept unchanged, the motor 3 is started, the four curved surface rotary cutting blades 6 are driven to horizontally rotate along the annular guide rail 7 through the transmission of the rotating shaft 4 and the hydraulic rod 5, the unextruded soil is rotary-cut, the expanding head forms a relatively complete round table-like body space, and the expanding operation is completed.
After the bottom expansion is completed, the rotary spray head and the slurry conveying guide pipe are lowered to the bottom of the mould pile, the length of the cross-shaped hydraulic rod is contracted to drive all rotary cutting blades to be polymerized inwards, in the pile pulling process, the straight pile unit cylinder above the ground is slowly pulled and detached, if the pile height above the ground is too long, the pile weight above the ground can increase the load of pile pulling operation of the pile pulling machine, and the load of the pile pulling machine is reduced by spirally detaching the straight pile unit cylinder above the ground.
When the pressed pile body is overlong, the pile body and the soil around the pile body can generate larger negative friction force during pile pulling, so that the damage caused by the large negative friction force is that the load of a pile pulling machine is increased, and the soil around the pile body can be driven to deform or move upwards, even collapse holes are caused, and the main measures are that 1, the outer surface of the pile body is made of materials with smooth surfaces as much as possible, or the outer surface of the pile body is subjected to polishing treatment. 2. Before the pressing operation, the external surface of pile body is coated with vaseline and other lubricating materials. Through reducing the roughness of the outer surface of the pile body, the negative friction resistance generated during pile pulling is reduced, and the damage is effectively avoided.
And when the mould pile is slowly lifted, the rotary spray head at the bottom of the pile performs rotary spray operation, the concrete is sprayed to protect the wall, the hole wall is supported in advance, and the lifting speed of the mould pile is consistent with that of the rotary spray head. Stopping the rotary spraying operation after the mold pile is pulled out completely, withdrawing the rotary spray head, checking the sediment thickness of the slag soil at the bottom of the hole, if the sediment thickness exceeds the stipulation, carrying out one-time hole cleaning operation, after hole cleaning is completed, lowering the reinforcement cage and the grouting guide pipe for pouring operation, adopting a method of pouring while vibrating, withdrawing the pile casing at the position of the hole opening after pouring is completed, and finishing the construction of pouring the club-footed pile by the static pressure mold.
Compared with the traditional construction method of drilling and pouring the club-footed pile and the high-pressure jet grouting club-footed pile, the invention has the following advantages:
The method of combining rotary cutting and extrusion expansion is adopted to carry out expansion end construction, so that the risk of manual construction of the expansion end can be reduced, the generation of the expansion end is mechanized and standardized, the hole cleaning workload can be effectively reduced, and the method is a low-vibration, low-noise and pollution-free pile-pressing and bottom-expanding method. The pile mould is pressed in by adopting a static pressure method, and the hole is formed at the enlarged end of the pile mould in a rotary cutting way, so that loess around the pile is effectively compacted, the collapsibility of the loess is reduced, and the bearing capacity of a single pile is improved. The straight pile of the mould pile is formed by spirally splicing a plurality of sections of unit straight pile barrels, and the unit straight pile barrels are convenient to transport, store, carry and disassemble and can meet the design requirements of different pile lengths through spiral height connection. By controlling different telescopic lengths of the hydraulic rod, the construction requirements on different bottom expanding angles can be met, and the hydraulic rod has the characteristic of flexible construction. The pile mould is pressed into the soil by adopting the rigid pile driver, when the mould pile reaches a specified elevation, the bottom of the mould pile is subjected to bottom expanding operation by a rotary-cut squeezing and expanding device, and after the pile is completely formed, the pile body mould is pulled out by a pile body pressing machine, so that one machine is dual-purpose, the pile pressing cost is saved, and the construction flow is simplified. The die can be withdrawn for secondary use after hole forming, so that the engineering cost is reduced.
Claims (2)
1. The rotary-cut extrusion-expansion device for the static-pressure club-footed pile in the loess area is characterized by comprising a mould pile, wherein the mould pile consists of a plurality of straight pile unit barrels (1) which are in threaded connection and an expansion end rotary-cut structure, a motor (3) is arranged in each straight pile barrel (2) which is positioned at the bottom of each straight pile unit barrel (1), an annular guide rail (7) is arranged at the bottom end of each straight pile barrel (2), the expansion end rotary-cut structure comprises four curved rotary-cut blades (6), the four curved rotary-cut blades (6) are enclosed together to form an inverted conical pile tip, the top of the inverted conical pile tip is hinged with the annular guide rail (7) through an arc hinge, a hydraulic rod (5) is fixed on each curved rotary-cut blade (6), the output end of each hydraulic rod (5) extends to the inner wall of the curved rotary-cut blade (6), the non-jacking end parts of the four hydraulic rods (5) are fixed on a support, and the bottom end of a rotating shaft (4) of the motor (3) is fixed at the center position of the support;
The construction method of the rotary-cut extrusion-expansion device for the static-pressure pedestal pile in the loess area comprises the following specific steps:
Step 1, burying pile casings at the determined pile positions, pressing part of die pile bodies after screwing into foundation soil by using a holding press, stopping pressing when the pile height above the ground, which is not pressed into the soil, is suitable for screwing a straight pile unit cylinder, performing screwing operation, alternately performing screwing and pressing, repeating the construction process until the pressed pile length reaches the design requirement, stopping screwing and pressing of the straight pile cylinder, and finishing the pore-forming operation of the straight pile section;
Step 2, simultaneously outputting and jacking four output ends of the hydraulic rod, pushing the four curved rotary cutting blades to squeeze and expand in four directions until the designed bottom expanding angle requirement is met, controlling the hydraulic rod to shrink slowly after preliminary support, enabling the four curved rotary cutting blades to polymerize inwards by shrinkage of the hydraulic rod to form a conical pile tip form, and completing soil extrusion for the first time;
Step 3, after polymerization is completed, enabling the four curved surface rotary-cut blades to horizontally rotate by a certain angle, enabling the motor to drive the four curved surface rotary-cut blades to rotate along the annular guide rail, extruding soil again after rotation, and enabling the expansion head to form a truncated cone-like space after final soil extrusion in a final stage, wherein when the four curved surface rotary-cut blades reach a designed extrusion expansion angle, the expansion length of the hydraulic rod is kept unchanged, namely the bottom expansion angle is kept unchanged, enabling the motor to drive the four curved surface rotary-cut blades to horizontally rotate along the annular guide rail through transmission of the rotating shaft and the hydraulic rod, and enabling the expansion head to form a truncated cone-like space until bottom expansion operation is completed;
And 4, after the bottom expansion is finished, the rotary spray head and the slurry conveying guide pipe are lowered to the bottom of the mould pile, the length of the hydraulic rod is contracted to drive all curved rotary cutting blades to be polymerized inwards, then the straight pile cylinder above the ground is slowly pulled out and disassembled, hole cleaning operation is carried out after the mould pile is completely pulled out, pouring operation is carried out after hole cleaning is finished, a vibration and pouring method is adopted, after pouring is finished, the pile cylinder at the orifice position is withdrawn, and the construction of pouring the bottom expansion pile by the static pressure mould is finished.
2. The rotary-cut extrusion-expansion device for the static-pressure pedestal pile in the loess area according to claim 1, wherein the motor (3) is fixed on the inner wall of the straight pile cylinder (2) through a bracket.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210029240.9A CN114526013B (en) | 2022-01-11 | 2022-01-11 | A rotary cutting and extrusion device for static pressure bottom expansion piles in loess areas and a construction method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210029240.9A CN114526013B (en) | 2022-01-11 | 2022-01-11 | A rotary cutting and extrusion device for static pressure bottom expansion piles in loess areas and a construction method thereof |
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| Publication Number | Publication Date |
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| CN114526013A CN114526013A (en) | 2022-05-24 |
| CN114526013B true CN114526013B (en) | 2025-01-07 |
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| CN118855385A (en) * | 2024-07-05 | 2024-10-29 | 西安理工大学 | A vibration, tamping and pressing device for electric vibration, drilling and hydraulic hole expansion |
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| CN103410142A (en) * | 2013-08-09 | 2013-11-27 | 武汉中力岩土工程有限公司 | Construction method for cast-in-place pile through punching and base expanding and base expanding device |
| CN106401466A (en) * | 2016-11-24 | 2017-02-15 | 刘泽华 | Soil squeezing rotary spraying pedestal pile forming device and construction method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2667697B2 (en) * | 1989-01-10 | 1997-10-27 | 日立建機株式会社 | Drilling device for expanded bottom part of hole for expanded pile by earth drill method |
| CN109973026B (en) * | 2019-04-08 | 2020-12-15 | 王磊 | Pile construction method and special drill rod system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103410142A (en) * | 2013-08-09 | 2013-11-27 | 武汉中力岩土工程有限公司 | Construction method for cast-in-place pile through punching and base expanding and base expanding device |
| CN106401466A (en) * | 2016-11-24 | 2017-02-15 | 刘泽华 | Soil squeezing rotary spraying pedestal pile forming device and construction method thereof |
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