CN112593581A - Heel-while-drilling pipe pile sediment formation test system and method capable of achieving pile bottom grouting - Google Patents

Abstract

The invention discloses a test system for forming sediment of a follow-up pipe pile, which can realize pile bottom grouting and comprises an expandable wing shrinkage drill bit, a spiral drill rod, a drilling power device, a model pile body, a grouting device and a concrete core filling device, wherein the expandable wing shrinkage drill bit is connected with the drilling power device through the spiral drill rod, the expandable wing shrinkage drill bit and the spiral drill rod are used for simulating the drilling and sediment forming process of the follow-up pipe pile in the model pile body, the grouting device is used for grouting the model pile body, the concrete core filling device is used for filling concrete into the model pile body, the model pile body is simulated by the expandable wing shrinkage drill bit which can simulate the shrinkage and the expansion of an actual drill bit, the model pile body is simulated by adopting a machine glass pipe pile with a pre-embedded grouting pipe, the grouting device and the concrete core filling device are used for grouting and filling concrete into the model pile body, and simulating the sediment grouting process of the actual pile bottom, the pile bottom sediment and sediment grouting body shapes which are consistent with the actual engineering pile can be obtained without considering other excessive influence factors.

Description

Heel-while-drilling pipe pile sediment formation test system and method capable of achieving pile bottom grouting

Technical Field

The invention belongs to the technical field of civil test equipment, and particularly relates to a heel-while-drilling pipe pile sediment formation test system and method capable of realizing pile bottom grouting.

Background

The pile foundation is an important foundation form for building (construction), and at present, the requirements of high bearing performance, industrialization, energy conservation, consumption reduction and environmental protection are difficult to simultaneously consider the requirements of high bearing performance, industrialization, environmental protection and the like for slurry wall protection bored pile used in a large amount in domestic foundation engineering and precast pile construction by adopting a hammering or static pressure construction method, so that the implantable tubular pile construction methods such as cement-soil composite tubular piles, static drilling root planting method piles, middle digging method tubular piles, while-drilling heel tubular piles and the like are researched and developed on the basis of the foreign implantable tubular pile technology in China. The heel-while-drilling pipe pile is a large-diameter (800 mm-1400 mm) non-soil-extrusion PHC pipe pile with a pre-drilled hole. The construction process has the characteristics that the PHC tubular pile is sunk into a hole while drilling to form the hole, soil and rock residues are discharged from the inner cavity of the tubular pile, cement slurry or cement mortar is poured into the outer side of the tubular wall, and the pile core can be completely or partially filled with concrete to seal the bottom. The following-drilling tubular pile combines the advantages of a manual hole digging pile, a drilling cast-in-place pile and a prestressed tubular pile, and has the advantages of high single-pile bearing capacity, strong stratum adaptability, high construction speed, environmental friendliness and the like.

After drilling with the tubular pile and drilling to the design elevation, the drill rod reverse rotation shrinkage drill bit withdraws from the tubular pile inner chamber, and at this moment, the dregs that the part is located on helical blade drop, receives the drill bit structure influence, and the dregs below the helical blade bottom are difficult to discharge. The process aims to shake the tubular pile through a vibration exciter of the pile machine, so that a pile shoe of the tubular pile directly falls on a pile end bearing layer. Because no special pile end slag removing system is provided, the exciting force of a vibration exciter of the pile machine is small, the slag soil at the pile end can not be completely discharged, and the sediment at the bottom of the pile still remains. The sediment at the bottom of the pile, the core filling concrete and the cement paste are mutually permeated and fused to form a sediment-concrete-cement paste mixture (sediment grouting body for short). The thickness and the strength of the sediment directly influence the bearing deformation performance of the heel-pipe pile while drilling, and have great influence on the exertion of the resistance of the pile end and the destruction mode of the pile, so that the identification of the formation mechanism and the mechanical property of the sediment grouting body at the bottom of the pile is very important. However, the pile bottom grouting belongs to hidden engineering, the current monitoring means is very limited, and parameters such as the flow process of the pile bottom grout, the grouting influence range, the reaming diameter formed after grouting and the like are difficult to effectively obtain, so that the structural composition and the mechanical property of the pile bottom sediment grouting body are not sufficiently known, the influence of the sediment grouting body on the vertical bearing property of a pile foundation is not clear, and the popularization and the application of the root pipe pile while drilling are not favorable. In addition, there are also few test means and methods for simulating the formation mechanism of pile bottom sediment, especially the pile bottom sediment slip casting mechanism of the follow-up pipe pile, so that a test system and method for forming pile bottom sediment while drilling, which can realize pile bottom slip casting, need to be designed, and a means is provided for the research on the shape of the pile bottom sediment or sediment slip casting of the follow-up pipe pile while drilling.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention aims to provide a test system for forming the sediment of the heel-while-drilling tubular pile, which can realize the grouting of the pile bottom, and aims to solve the problems of the existing monitoring technology and test technology for the formation mechanism of the sediment of the pile bottom of the heel-while-drilling tubular pile.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

the utility model provides a can realize pile bottom slip casting along with tubular pile sediment formation test system, including can expanding wing shrink drill bit, auger stem, creep into power device, model pile body, slip casting device and concrete core filling device, can expand wing shrink drill bit and pass through auger stem and be connected with the power device that creeps into, can expand wing shrink drill bit, auger stem and be used for simulating in the model pile body along with the drilling of tubular pile and sediment formation process, the slip casting device is used for to the slip casting of model pile body, the concrete core filling device is used for filling core concrete to the model pile body.

Preferably, the wing-expandable retractable drill bit comprises a movable wing plate, a wing plate bolt, a drill bit fixing wing plate and a drill bit conical tip body, the bottom of the drill bit fixing wing plate is connected with the drill bit conical tip body, the top of the drill bit fixing wing plate is connected with the auger stem, and the movable wing plate is hinged to one side of the drill bit fixing wing plate through the wing plate bolt.

Preferably, one side of the drill bit fixing wing plate is provided with a groove portion, the wing plate bolt is arranged in the groove portion, the movable wing plate comprises a connecting portion and a bent portion, the connecting portion is arranged in the groove portion and hinged to the wing plate bolt, and the bent portion is located outside the groove portion and bends towards the bottom direction of the drill bit fixing wing plate.

Preferably, the power device creeps into includes multi-functional ground auger, ground auger handrail and fixed connection buckle, pass through connecting rod and bolt fixed connection between the drive end of multi-functional ground auger and the auger stem, the both sides that multi-functional ground auger was bored are located to the ground auger handrail, the ground auger handrail passes through the fixed connection buckle and is connected with the model pile body.

Preferably, the model pile body includes the organic glass tubular pile, the organic glass tubular pile is equipped with the slip casting pipe including supplying the inner chamber that wing shrink drill bit, auger stem penetrate that expands, on the organic glass tubular pile and along its extending direction, is equipped with the slip casting mouth in the bottom of slip casting pipe, and the open end of slip casting mouth is located the outer wall of organic glass tubular pile.

Preferably, the grouting device comprises a first connecting pipe, a second connecting pipe, a controllable electric grouting machine and a grouting stirring tank, the controllable electric grouting machine is connected with the model pile body through the first connecting pipe, the second connecting pipe is respectively connected with the controllable electric grouting machine and the grouting stirring tank, and grouting liquid is arranged in the grouting stirring tank.

Preferably, the concrete core filling device comprises a discharge pipe, a controllable electric material spraying machine, a third connecting pipe, a raw material stirring tank and a material filling pipe, wherein the third connecting pipe is respectively connected with the controllable electric material spraying machine and the raw material stirring tank, the discharge pipe is respectively connected with the controllable electric material spraying machine and the material filling pipe, fine sand concrete is arranged in the raw material stirring tank, and the concrete core filling device fills core concrete into the model pile body through the material filling pipe.

Preferably, the size of a spiral blade of the spiral drill rod is 10-40 cm, and the diameter of the model pile body is 15-60 cm.

Compared with the prior art, the invention has the beneficial effects that:

the invention provides a test system for forming sediment of a follow-up tubular pile capable of realizing pile bottom grouting, which simulates the shrinkage of an actual drill bit and the drilling of an expansion wing shrinkage drill bit of an expansion wing in a soil layer, adopts a multifunctional drilling power device as power, adopts a machine glass tubular pile with a pre-embedded grouting pipe to simulate a model pile body, utilizes a grouting device and a concrete core filling device to grout and fill core concrete into the model pile body, simulates the forming process of actual pile bottom sediment grouting body, can be carried out in the soil layer on site, does not need to consider other excessive influence factors, and can obtain the shapes of the pile bottom sediment and the sediment grouting body which are consistent with the actual engineering pile. The test system has strong equipment operability and is convenient to realize; meanwhile, the test can be carried out on site, can be carried out under the condition of meeting power, and has small limitation condition and wide application range.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a block diagram of the present invention;

FIG. 2 is a schematic view of an expandable wing retractable drill bit of the present invention in a forward drilling condition;

FIG. 3 is a schematic representation of an expandable wing retractable drill bit of the present invention in a back-drilling condition;

FIG. 4 is a flow chart of the test method of the present invention.

Description of reference numerals:

1-expandable wing contraction drill bit, 101-movable wing plate, 102-wing plate bolt, 103-drill bit fixed wing plate, 104-drill bit cone tip body, 105-groove part, 106-bending part, 2-auger stem, 201-blade, 3-drilling power device, 301-multifunctional ground drill, 302-ground drill handrail, 303-fixed connection buckle, 4-model pile body, 401-machine glass tubular pile, 402-grouting pipe, 403-grouting port, 5-grouting device, 501-first connection pipe, 502-second connection pipe, 503-controllable electric grouting machine, 504-grouting stirring tank, 6-concrete core filling device, 601-discharge pipe, 602-controllable electric spraying machine, 603-third connection pipe, 604-raw material stirring tank, 605-injection pipe.

Detailed Description

So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. It should be noted that the embodiments of the present invention and features of the embodiments may be combined with each other without conflict. In the following description, numerous specific details are set forth to provide a thorough understanding of the present invention, and the described embodiments are merely a subset of the embodiments of the present invention, rather than a complete embodiment. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Referring to fig. 1 to 4, an embodiment of the invention provides a test system for forming sediment of a heel-while-drilling tubular pile, which can realize pile bottom grouting, and the test system comprises an expandable wing shrinkage drill bit 1, a spiral drill rod 2, a drilling power device 3, a model pile body 4, a grouting device 5 and a concrete core filling device 6, wherein the expandable wing shrinkage drill bit 1 is connected with the drilling power device 3 through the spiral drill rod 2, the expandable wing shrinkage drill bit 1 and the spiral drill rod 2 are used for simulating a drilling and sediment forming process of the heel-while-drilling tubular pile in the model pile body 4, the grouting device 5 is used for grouting the model pile body 4, and the concrete core filling device 6 is used for filling concrete into the model pile body 4.

According to the invention, the wing expansion shrinkage drill bit capable of simulating actual drill bit shrinkage and wing expansion drills in the soil layer, the multifunctional drilling power device 3 is used as power, the machine glass tubular pile 401 with the grouting pipe 402 embedded is used for simulating a large-diameter tubular pile, the grouting device 5 and the concrete core filling device 6 are used for grouting and filling concrete into the model pile body 4, the forming process of the actual pile bottom sediment grouting body is simulated, the simulation can be carried out in the field soil layer, other excessive influence factors are not required to be considered, and the shapes of the pile bottom sediment and the sediment grouting body which are consistent with the actual engineering pile can be obtained. The test system has strong equipment operability and is convenient to realize; meanwhile, the test can be carried out on site, can be carried out under the condition of meeting power, and has small limitation condition and wide application range.

Further, the expandable wing retractable drill bit 1 comprises a movable wing plate 101, a wing plate bolt 102, a drill bit fixing wing plate 103 and a drill bit cone tip body 104, the bottom of the drill bit fixing wing plate 103 is connected with the drill bit cone tip body 104, the top of the drill bit fixing wing plate 103 is connected with the auger stem 2, a groove portion 105 is arranged on one side of the drill bit fixing wing plate 103, the wing plate bolt 102 is arranged in the groove portion 105, the movable wing plate 101 comprises a connecting portion and a bent portion 106, the connecting portion is arranged in the groove portion 105 and hinged to the wing plate bolt 102, and the bent portion 106 is located outside the groove portion 105 and bent towards the bottom of the drill bit fixing wing plate 103. The mechanical principle of the drill bit 1 capable of expanding and contracting wings is the same as that of an actual drill bit, the movable wing plate 101 is pushed away by soil during forward drilling, and the movable wing plate 101 is pressed back and contracted by soil during reverse rotation and retraction. By adding the drill bit cone tip body 104 with the movable wing plate 101 structure to drill in the soil layer, the drilling process of the heel tubular pile while drilling and the sediment forming process can be effectively simulated. The structure of the movable wing plate 101 is used for simulating the working state of an actual drill bit on site, and meanwhile, the structure of the actual drill bit is simplified, and the test cost is effectively reduced.

Further, the drilling power device 3 comprises a multifunctional ground auger 301, a ground auger handrail 302 and a fixed connection buckle 303, the driving end of the multifunctional ground auger 301 is fixedly connected with the auger stem 2 through a connecting rod and a bolt, the ground auger handrail 302 is arranged on two sides of the multifunctional ground auger 301, and the ground auger handrail 302 is connected with the model pile body 4 through the fixed connection buckle 303.

Further, model pile body 4 includes organic glass tubular pile 401, organic glass tubular pile 401 is equipped with slip casting pipe 402 including the inner chamber that confession can expand wing shrink drill bit 1, auger stem 2 and penetrate on organic glass tubular pile 401 and along its extending direction, is equipped with slip casting mouth 403 in the bottom of slip casting pipe 402, and the open end of slip casting mouth 403 is located organic glass tubular pile 401's outer wall surface. Cutting and digging a groove which is actually needed by a cutting machine on the outside axial symmetry line of the organic glass tubular pile 401, setting out and positioning the whole long groove on the tubular pile body before digging, embedding the grouting pipe 402 into the groove, fixing and grinding the surface by using quick-drying AB glue, and forming a grouting port 403 at the bottom end of the organic glass tubular pile 401.

Further, the grouting device 5 includes a first connecting pipe 501, a second connecting pipe 502, a controllable electric grouting machine 503 and a grouting agitation tank 504, the controllable electric grouting machine 503 is connected with the model pile body 4 through the first connecting pipe 501, the second connecting pipe 502 is respectively connected with the controllable electric grouting machine 503 and the grouting agitation tank 504, and grouting liquid is provided in the grouting agitation tank 504. The controllable electric grouting machine 503 can control the water cement ratio, grouting pressure and grouting amount, and can simulate the grouting effect of the pile end of the follow-up tubular pile under different grouting conditions.

Further, the concrete core filling device 6 comprises a discharge pipe 601, a controllable electric material spraying machine 602, a third connecting pipe 603, a raw material stirring tank 604 and a material injection pipe 605, the third connecting pipe 603 is respectively connected with the controllable electric material spraying machine 602 and the raw material stirring tank 604, the discharge pipe 601 is respectively connected with the controllable electric material spraying machine 602 and the material injection pipe 605, fine sand concrete is arranged in the raw material stirring tank 604, and the concrete core filling device 6 fills core concrete into the model pile body 4 through the material injection pipe 605.

Further, the size of a spiral blade of the spiral drill rod 2 is 10-40 cm, and the diameter of the model pile body 4 is 15-60 cm. The size of the model of the whole test system is about 1/3 of the size of actual construction equipment, actual construction can be simulated more reasonably, particularly, the problem of similarity ratio caused by small model can be solved for simulated grouting slurry diffusion, and the slurry diffusion rule and the shape of sediment grouting slurry are simulated more reasonably.

The invention also discloses a test method for forming sediment of the heel-while-drilling tubular pile, which can realize pile bottom grouting and comprises the following steps:

s1, connecting the wing-expandable retractable drill bit with a drilling power device through a spiral drill rod, connecting the drilling power device with the model pile body, and placing the wing-expandable retractable drill bit and the spiral drill rod in the model pile body;

s2, placing the model pile body in a field test stratum, starting a drilling power device, starting a forward rotation mode, and expanding the wing to contract the drill bit to perform forward drilling; adjusting the size of an accelerator of a drilling power device according to actual stratum conditions, controlling the drilling speed, drilling a spiral drill rod through an inner cavity of a model pile body, allowing the model pile body to follow and sink, taking out residual soil through blades 201 of the spiral drill rod, and allowing the model pile body to play a sleeve role;

s3, when the wing expanding shrinkage drill bit drills to a designed layer, the drilling power device is closed, the model pile body is separated from the drilling power device, the reverse mode is started, and the wing expanding shrinkage drill bit and the auger stem withdraw from the model pile body; lifting the spiral drill rod while reversing, contracting the movable wing plate, and withdrawing the wing-expandable and contractible drill bit and the spiral drill rod from the inner cavity of the model pile body; in the process of reversing the auger stem and contracting the expandable wing contraction drill bit, part of muck on the blade 201 of the auger stem falls to form pile bottom sediment, so that the formation of the pile bottom sediment of the following tubular pile while drilling is well simulated, and the method is the basis of the subsequent pile bottom grouting effect research;

s4, performing concrete core filling operation into the model pile body through the concrete core filling device;

s5, standing for a period of time, and grouting the model pile body through a grouting device after the core filling concrete is initially set; the grouting liquid, the core filling concrete and the pile bottom sediment of the model pile body mutually permeate to form sediment grouting body;

s6, standing and maintaining for a period of time after grouting, excavating a soil layer, identifying the geometric structural characteristics of the sediment grouting body, and researching the grouting effect of sediment under different grouting conditions and soil texture conditions and the sediment grouting body forming mechanism.

Further, in step S6, the standing and maintaining time is 7 days, and the grouting conditions include grouting pressure and grouting amount.

In summary, compared with the prior art, the method has the following advantages:

1. according to the invention, the wing expansion shrinkage drill bit capable of simulating actual drill bit shrinkage and wing expansion drills in the soil layer, a multifunctional drilling power device is adopted as power, a machine glass tubular pile with a pre-embedded grouting pipe is adopted to simulate a model pile body, a grouting device and a concrete core filling device are utilized for grouting and filling concrete into the model pile body, the forming process of actual pile bottom sediment grouting body is simulated, the simulation can be carried out in the soil layer on site, other excessive influence factors are not required to be considered, and the shapes of the pile bottom sediment and the sediment grouting body which are consistent with the shapes of actual engineering piles can be obtained.

2. The spiral drill rod is matched with the inner cavity of the model pile body to perform pile bottom core filling and pile bottom grouting, so that the pile bottom sediment grouting forming process of the model pile body can be reasonably and accurately simulated. When only the morphological structure and the forming mechanism of the sediment in the construction process are analyzed, the concrete core filling and the pile bottom grouting process are not required to be implemented.

3. The pile bottom grouting mode is consistent with the actual engineering grouting mode, and the grouting pressure and the grouting amount are controlled by the grouting device, so that the pile end grouting effect of the follow-up tubular pile can be simulated under different grouting conditions.

4. The test system has strong equipment operability and is convenient to realize; meanwhile, the test can be carried out on site, can be carried out under the condition of meeting power, and has small limitation condition and wide application range.

It should be noted that other contents of the heel-while-drilling tubular pile sediment formation testing system capable of realizing pile bottom grouting disclosed by the invention can be referred to in the prior art, and are not described herein again.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, so that any modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.

Claims (10)

1. The utility model provides a can realize at bottom of pile slip casting along with tubular pile sediment formation test system, its characterized in that, including can expanding wing shrink drill bit, auger stem, drilling power device, model pile body, slip casting device and concrete core filling device, can expand wing shrink drill bit and pass through auger stem and be connected with drilling power device, can expand wing shrink drill bit, auger stem and be used for simulating along with the drilling of tubular pile and sediment formation process in the model pile body, the slip casting device is used for to the slip casting of model pile body, the concrete core filling device is used for filling core concrete to the model pile body.

2. The system for testing formation of the sediment of the tubular pile while drilling capable of realizing pile bottom grouting according to claim 1, wherein the retractable drill bit with expandable wings comprises a movable wing plate, a wing plate bolt, a fixed wing plate of a drill bit and a drill bit conical tip body, the bottom of the fixed wing plate of the drill bit is connected with the drill bit conical tip body, the top of the fixed wing plate of the drill bit is connected with a spiral drill rod, and the movable wing plate is hinged with one side of the fixed wing plate of the drill bit through the wing plate bolt.

3. The system of claim 2, wherein a groove portion is formed in one side of the drill bit fixing wing plate, the wing plate bolt is arranged in the groove portion, the movable wing plate comprises a connecting portion and a bending portion, the connecting portion is arranged in the groove portion and hinged to the wing plate bolt, and the bending portion is located outside the groove portion and bends toward the bottom of the drill bit fixing wing plate.

4. The system for testing formation of sediment of a heel-while-drilling tubular pile capable of realizing pile bottom grouting according to claim 1, wherein the drilling power device comprises a multifunctional ground drill, a ground drill handrail and a fixed connection buckle, the driving end of the multifunctional ground drill is fixedly connected with the auger stem through a connecting rod and a bolt, the ground drill handrail is arranged on two sides of the multifunctional ground drill, and the ground drill handrail is connected with the model pile body through the fixed connection buckle.

5. The system for testing formation of pile-bottom grouting while drilling with tubular pile sediment as claimed in claim 1, wherein the model pile body comprises an organic glass tubular pile, the organic glass tubular pile comprises an inner cavity for penetration of a wing expansion shrinkage drill bit and a spiral drill rod, a grouting pipe is arranged on the organic glass tubular pile and along the extension direction of the organic glass tubular pile, a grouting port is arranged at the bottom of the grouting pipe, and the open end of the grouting port is located on the outer wall surface of the organic glass tubular pile.

6. The system for testing formation of sediment of follow-drilling tubular pile capable of realizing pile bottom grouting according to claim 1, wherein the grouting device comprises a first connecting pipe, a second connecting pipe, a controllable electric grouting machine and a grouting stirring tank, the controllable electric grouting machine is connected with the model pile body through the first connecting pipe, the second connecting pipe is respectively connected with the controllable electric grouting machine and the grouting stirring tank, and grouting liquid is arranged in the grouting stirring tank.

7. The system for testing formation of sediment of follow-drilling tubular pile capable of realizing pile bottom grouting according to claim 1, wherein the concrete core filling device comprises a discharging pipe, a controllable electric material spraying machine, a third connecting pipe, a raw material stirring tank and a material filling pipe, the third connecting pipe is respectively connected with the controllable electric material spraying machine and the raw material stirring tank, the discharging pipe is respectively connected with the controllable electric material spraying machine and the material filling pipe, fine sand concrete is arranged in the raw material stirring tank, and the concrete core filling device fills the core concrete into the model pile body through the material filling pipe.

8. The heel-while-drilling tubular pile sediment formation testing system capable of realizing pile bottom grouting according to claim 1, wherein the spiral blade size of the spiral drill rod is 10-40 cm, and the diameter size of the model pile body is 15-60 cm.

9. The test method for formation of sediment of heel-while-drilling tubular pile capable of realizing pile bottom grouting according to any one of claims 1 to 8, characterized by comprising the following steps:

s1, connecting the wing-expandable retractable drill bit with a drilling power device through a spiral drill rod, connecting the drilling power device with the model pile body, and placing the wing-expandable retractable drill bit and the spiral drill rod in the model pile body;

s2, placing the model pile body in a field test stratum, starting a drilling power device, starting a forward rotation mode, and expanding the wing to contract the drill bit to perform forward drilling;

s3, when the wing expanding shrinkage drill bit drills to a designed layer, the drilling power device is closed, the model pile body is separated from the drilling power device, the reverse mode is started, and the wing expanding shrinkage drill bit and the auger stem withdraw from the model pile body;

s4, performing concrete core filling operation into the model pile body through the concrete core filling device;

s5, standing for a period of time, and grouting the model pile body through a grouting device after the core filling concrete is initially set;

s6, standing and maintaining for a period of time after grouting, excavating a soil layer, identifying the geometric structural characteristics of the sediment grouting body, and researching the grouting effect of sediment under different grouting conditions and soil texture conditions and the sediment grouting body forming mechanism.

10. The method for testing formation of sediments of a heel-while-drilling tubular pile capable of realizing pile bottom grouting according to claim 9, wherein in step S6, the standing and maintaining time is 7 days, and the grouting conditions comprise grouting pressure and grouting amount.

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