Static drilling rooted pile cement paste in-situ taking device and in-situ test piece preparation method

Abstract

The invention discloses a static drilling root planting pile cement paste in-situ slurry taking device and an in-situ test piece preparation method. The static drilling root planting pile cement paste in-situ slurry taking device comprises a sampling barrel, a sealing bag, a sealing rope and a plurality of lengthening rods. Openings are respectively formed in the top and the bottom of the sampling barrel; openings are formed in the two ends of the sealing bag, one end serves as a fixed end to be arranged on the outer side of the bottom of the sampling barrel in a sleeving mode and fixed, the other end serves as a free end, a rope sleeve is arranged at the opening of the end, and two penetrating openings distributed at intervals are formed in the rope sleeve; one end of the sealing rope penetrates into the rope sleeve from one penetrating opening, penetrates out of the other penetrating opening and then is knotted and tied to the rope body of the sealing rope, the knotted rope knot can slide along the rope body of the sealing rope, and the other end of the sealing rope enters the inner cavity of the sampling barrel from the opening in the bottom of the sampling barrel and extends out of the opening in the top of the sampling barrel; the adjacent lengthening rods are detachably connected, and the lengthening rod at the bottom end is detachably connected with the sampling barrel. In-situ slurry taking is achieved through the static drilling rooted pile cement slurry in-situ slurry taking device, the cement slurry obtained after in-situ slurry taking is used for manufacturing an in-situ cement soil test piece, compressive strength testing is carried out, and accordingly the pile foundation quality is judged so that remedial measures can be taken conveniently.

Description

Technical Field

[0001] The present invention relates to the technical field of pile foundation engineering, and particularly relates to an in-situ slurry sampling device for static drilling and root planting pile cement slurry and an in-situ specimen preparation method. Background Art

[0002] As a key load-bearing structure for projects such as bridges and buildings, the construction technology of pile foundations is directly related to project safety and service life. Static pressure piles are formed by statically pressing precast pile bodies, which have the advantages of small construction vibration and low noise, but there are problems such as significant soil compaction effect and limited pile length (difficult to penetrate hard interlayers). Bored cast-in-place piles are formed by pouring concrete after drilling, which can adapt to complex geological conditions, but there are defects such as the risk of mud pollution and the large influence of construction technology on the pile body quality (such as hole wall collapse and concrete segregation).

[0003] To combine the advantages of these two types of technologies, in recent years, composite pile foundation technologies have emerged, such as static drilling and root planting piles. This technology combines static pressure precast piles and drilling and grouting processes, and uses the cement soil curing layer to enhance the friction at the pile-soil interface, which theoretically can improve the bearing capacity of the pile foundation and reduce construction risks.

[0004] Although static drilling and root planting piles show potential in applications in soft soil areas, the bottleneck problem of their construction quality control has not been effectively solved. One of them is the difficulty in detecting the strength of deep cement soil. The pile length of static drilling and root planting piles is usually 25 - 80m. When the depth exceeds 5m, due to equipment limitations, it is impossible to take slurry samples in-situ, resulting in the inability to directly verify the actual strength of the cement soil after hardening (especially in the deep part of the pile body). If the cement slurry ratio is improper (such as a high water-cement ratio) or the mixing is uneven (such as insufficient drill bit rotation speed and fluctuating grouting pressure), the hardened cement soil may have insufficient local strength, directly affecting the bearing performance of the pile foundation. Summary of the Invention

[0005] Therefore, the present invention provides an in-situ slurry sampling device for static drilling and root planting pile cement slurry and an in-situ specimen preparation method to solve the above technical problems.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The first aspect of the present invention provides an in-situ slurry sampling device for static drilling and root planting pile cement slurry, including:

[0008] A sampling bucket, which is cylindrical and has openings at the top and bottom respectively;

[0009] A sealed bag, which has openings at both ends. One end is used as a fixed end and is sleeved and fixed on the outer side of the bottom of the sampling bucket, and the other end is used as a free end. A rope sleeve is provided at the opening of this end, and two spaced-apart through holes are provided on the rope sleeve;

[0010] A sealing rope, one end of which passes through the rope sleeve through one of the through openings, passes out through the other through opening and is knotted on the rope body of the sealing rope. The knotted rope knot can slide along the rope body of the sealing rope. The other end enters the inner cavity of the sampling bucket from the bottom opening of the sampling bucket and extends out from the top opening of the sampling bucket;

[0011] A plurality of extension rods, adjacent extension rods are detachably connected, and the extension rod at the bottom is detachably connected to the sampling bucket.

[0012] Further, the sampling bucket is in a cylindrical shape and includes two semi-cylindrical shell casings. The two semi-cylindrical shell casings are buckled oppositely to form a cylindrical barrel, and the two buckled semi-cylindrical shell casings are fixed by fixing members.

[0013] Further, a release agent is applied to the inner side of the semi-cylindrical shell casing before buckling.

[0014] Further, the two buckled semi-cylindrical shell casings are fixed by a film wound around the outer side of the cylindrical barrel.

[0015] Further, it further includes a plurality of stainless steel screw sleeves. Inner threads are respectively arranged on the inner sides of both ends of the stainless steel screw sleeve. Stainless steel joints are respectively arranged at both ends of the extension rod. External threads are arranged on the stainless steel joints. Adjacent extension rods are connected by the stainless steel screw sleeves; the stainless steel screw sleeves are arranged on the outer side of the upper part of the sampling bucket, and the extension rod at the bottom is connected to the sampling bucket through the stainless steel screw sleeve.

[0016] Further, the sampling bucket is a PVC pipe with a length of 1.5 m and a diameter of 10 cm; the sealing bag is made of high-toughness plastic; the sealing rope is a high-toughness nylon rope; the extension rod is a high-strength and high-density carbon fiber tube.

[0017] In the second aspect of the present invention, a method for preparing an in-situ specimen of a static drilling and root-embedded pile is provided. Using the static drilling and root-embedded pile cement slurry in-situ sampling device provided in the first aspect of the present invention, it includes the following steps:

[0018] Arrange the sampling bucket, the sealing bag and the sealing rope, make the sealing bag located on the circumferential side of the sampling bucket, initially tighten the sealing rope, make the free end of the sealing bag stick to the outer wall of the sampling bucket, avoid entering the sampling bucket or blocking the bottom opening of the sampling bucket, and make the free end of the sealing rope pass through the bottom opening of the sampling bucket and thus pass out from the top opening of the sampling bucket;

[0019] Connect an extension rod to the upper part of the sampling bucket, lower the sampling bucket into the pile hole with cement slurry, and synchronously release the sealing rope as the sampling bucket descends. During the process of the sampling bucket initially entering the cement slurry, the sealing bag adheres to the outer wall of the sampling bucket under the action of the cement slurry. Release a slightly longer section of the sealing rope to make the sealing rope in the rope sleeve no longer in a tightened state;

[0020] As the sampling bucket is lowered, the extension rods are sequentially connected, and the sampling bucket is lowered to the target depth by using a number of extension rods.

[0021] After the sampling bucket is lowered to the target depth, the extension rods remain stationary, and the sealing rope is repeatedly and slowly released and slowly lifted, so that the free end of the sealing bag slowly detaches from the outer wall of the sampling bucket and moves downward to the lower part of the sampling bucket.

[0022] The extension rods remain stationary, and the sealing rope is lifted, so that the free end of the sealing bag extends from the bottom opening of the sampling bucket into the inner cavity bottom of the sampling bucket, and the sealing rope is tightened, so that the knot of the knotted rope slides along the rope body of the sealing rope, forcing the free ends of the sealing bag to be tightened together, thereby closing the bottom opening of the sampling bucket.

[0023] The sampling bucket is lifted, and the sealing rope is lifted synchronously.

[0024] The extension rods are removed.

[0025] A baffle is horizontally inserted at the bottom end of the sampling bucket, the part of the sealing bag outside the sampling bucket is cut off, and the sealing rope is slowly lifted, so that the remaining sealing bag and the sealing rope are slowly taken out from the top opening of the sampling bucket.

[0026] The sampling bucket together with the bottom baffle is transferred to a shady place, the sampling bucket is wrapped with a film, and water is sprayed for curing once every 8 hours, and it is left standing for 28 days.

[0027] Demoulding, removing the sampling bucket, selecting the upper, middle and lower parts of the solidified concrete column, preparing two specimens with a thickness of 10 cm each, and polishing the top and bottom surfaces of each specimen smoothly.

[0028] Further, when tidying up the sampling bucket, a demoulding agent is applied to the inner wall of the sampling bucket.

[0029] The present invention has the following advantages:

[0030] The present invention provides an in-situ slurry sampling device for static drilling and root planting piles. The sampling bucket can be lowered into the pile hole filled with cement slurry through the extension rods. During the process of lowering the sampling bucket, due to its design with upper and lower openings, the disturbance to the cement slurry is small, and the distribution of the cement slurry in the pile hole is hardly damaged. When the sampling bucket reaches the required depth, the cement slurry in the sampling bucket at this time is the original cement slurry at this depth. The bottom opening of the sampling bucket can be closed by the sealing bag through the sealing rope, and the sampling bucket is taken out through the extension rods. The cement slurry sample in the sampling bucket is the in-situ cement slurry at the required sampling depth, so as to realize in-situ slurry sampling by soil layer after the mixing of slurry and cement slurry is completed.

[0031] The present invention also provides a method for preparing in-situ specimens of static drilling and root-embedded piles. Using the in-situ cement slurry obtained by the in-situ cement slurry sampling device for static drilling and root-embedded piles, after the in-situ cement slurry solidifies, remove the sampling bucket, take out the cement column, cut two sections each from the upper, middle, and lower parts to prepare 6 in-situ cement soil specimens, and use the prepared specimens for compressive strength testing to judge the quality of the pile foundation so as to implement remedial measures.

[0032] The above summary is only for the purpose of the specification and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present application will be readily apparent by reference to the drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary, and for those of ordinary skill in the art, without creative efforts, other implementation drawings can also be obtained according to the provided drawings.

[0034] The structures, ratios, sizes, etc. illustrated in this specification are only used to cooperate with the content disclosed in the specification for those who are familiar with this technology to understand and read, and are not used to limit the limited conditions under which the present invention can be implemented. Therefore, they do not have a substantial technical meaning. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present invention.

[0035] Figure 1 Structural schematic diagram of an in-situ cement slurry sampling device for static drilling and root-embedded piles provided by an embodiment of the present invention (excluding the extension rod);

[0036] Figure 2 Structural schematic diagram (top view) of the sampling bucket and the seal bag of an in-situ cement slurry sampling device for static drilling and root-embedded piles provided by an embodiment of the present invention;

[0037] Figure 3 Structural schematic diagram of the connection of the extension rod of an in-situ cement slurry sampling device for static drilling and root-embedded piles provided by an embodiment of the present invention;

[0038] Figure 4 Structural schematic diagram of the connection between the sampling bucket and the extension rod of an in-situ cement slurry sampling device for static drilling and root-embedded piles provided by an embodiment of the present invention;

[0039] Figure 5Schematic diagram of the sampling bucket of an in-situ slurry sampling device for static drilling and root-embedded piles provided by an embodiment of the present invention. After the sampling bucket is lowered to the designated position, the sealing rope is lifted to make the sealed bag block the bottom opening of the sampling bucket.

[0040] Figure 6 Usage state diagram when sampling with an in-situ slurry sampling device for static drilling and root-embedded piles provided by an embodiment of the present invention.

[0041] In the figure: 1. Sampling bucket; 11. Pre-cut; 12. Semi-cylindrical barrel; 13. Clamp; 2. Sealed bag; 21. Rope sleeve; 3. Sealing rope; 4. Extension rod; 41. Stainless steel joint; 42. Stainless steel screw sleeve; 5. Pile hole. Detailed implementation manners

[0042] The following specific embodiments illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0043] Embodiment 1

[0044] As Figure 1-6 shown, this embodiment provides an in-situ slurry sampling device for static drilling and root-embedded piles, including a sampling bucket 1, a sealed bag 2, a sealing rope 3, and a plurality of extension rods 4.

[0045] The sampling bucket 1 is cylindrical, with openings at the top and bottom respectively. Preferably, the sampling bucket 1 is cylindrical. The sampling bucket 1 is used for in-situ slurry sampling to make specimens, and it needs to have a good demoulding effect. Therefore, in this embodiment, the sampling bucket 1 adopts a split design, including two semi-cylindrical barrel shells 12. The two semi-cylindrical barrel shells 12 are buckled together to form a cylindrical barrel. Before buckling, a demoulding agent is applied to the inner side of the semi-cylindrical barrel shell 12, or a demoulding agent is applied to the inner wall of the sampling bucket 1 before lowering it into the pile hole 5; the two semi-cylindrical barrel shells 12 after buckling are fixed by a fixing member; exemplarily, the fixing member is a film, that is, the two semi-cylindrical barrel shells 12 after buckling are fixed by a film wound around the outer side of the cylindrical barrel; exemplarily, the sampling bucket 1 is made of a PVC pipe with a length of 1.5 m and a diameter of 10 cm. At both ends of the same diameter of the PVC pipe, along the axis direction of the PVC pipe, a pre-cut 11 is made respectively, that is, the PVC pipe is cut in half longitudinally.

[0046] The two ends of the sealed bag 2 are provided with openings. One end is used as a fixed end and is sleeved and fixed on the outer side of the bottom of the sampling bucket 1, and the other end is used as a free end, and a rope sleeve 21 is arranged at the opening of this end. And two spaced-apart through holes are arranged on the rope sleeve 21. The material of the sealed bag 2 is high-toughness plastic to meet the use requirements.

[0047] One end of the sealing rope 3 passes through one of the through holes into the rope sleeve 21, passes through the other through hole and then is knotted to the rope body of the sealing rope 3. The knotted knot can slide along the rope body of the sealing rope 3; the other end enters the inner cavity of the sampling bucket 1 from the bottom opening of the sampling bucket 1 and extends out from the top opening of the sampling bucket 1. Exemplarily, the sealing rope 3 is a high-toughness nylon rope to meet the use requirements.

[0048] Adjacent extension rods 4 are detachably connected, and the extension rod 4 at the bottom is detachably connected to the sampling bucket 1. Exemplarily, the extension rod 4 is a high-strength and high-density carbon fiber tube to meet the use requirements. Exemplarily, the extension rod 4 and the extension rod 4, the extension rod 4 and the sampling bucket 1 are detachably connected by means of threaded connection. Specifically, stainless steel joints 41 are respectively arranged at both ends of the extension rod 4. One end of the stainless steel joint 41 is fixedly sleeved at the rod end of the extension rod 4, and the other end is provided with an external thread; adjacent extension rods 4 are connected by the stainless steel sleeve 42. Among them, internal threads are respectively arranged on the inner sides of both ends of the stainless steel sleeve 42; the stainless steel sleeve 42 is also arranged on the outer side of the upper part of the sampling bucket 1, and the stainless steel sleeve 42 can be fixed on the side of the sampling bucket 1 through a clamp 13, etc. The extension rod 4 at the bottom is connected to the sampling bucket 1 through the stainless steel sleeve 42.

[0049] The sampling bucket 1 can be lowered into the pile hole 5 filled with cement slurry through the extension rod 4. During the process of lowering the sampling bucket 1, due to its design with upper and lower openings, the disturbance to the cement slurry is small, and the distribution of the cement slurry in the pile hole 5 is hardly damaged. When the sampling bucket 1 reaches the required depth, the cement slurry in the sampling bucket 1 at this time is the original cement slurry at this depth. The sealed bag 2 can be used to seal the bottom opening of the sampling bucket 1 through the sealing rope 3. The sampling bucket 1 is taken out through the extension rod 4, and the cement slurry sample in the sampling bucket 1 is the in-situ cement slurry at the required sampling depth, so as to realize in-situ slurry sampling by soil layer after the slurry and cement slurry are stirred.

[0050] Embodiment 2

[0051] This embodiment provides a method for preparing in-situ specimens of static drilling and root planting piles, using the in-situ slurry sampling device for static drilling and root planting pile cement slurry in Embodiment 1, including the following steps:

[0052] Step S1, arrange the sampling bucket, the sealed bag and the sealing rope.

[0053] Apply a release agent to the inner wall of the sampling bucket; place the seal bag on the periphery of the sampling bucket; initially tighten the sealing rope so that the free end of the seal bag adheres to the outer wall of the sampling bucket, preventing it from entering the sampling bucket or blocking the bottom opening of the sampling bucket; pass the free end of the sealing rope through the bottom opening of the sampling bucket and out through the top opening of the sampling bucket.

[0054] Step S2: Lower the sampling bucket to the required depth.

[0055] Connect an extension rod to the upper part of the sampling bucket, lower the sampling bucket into the pile hole with cement slurry, and release the sealing rope synchronously as the sampling bucket descends. During the process of the sampling bucket initially entering the cement slurry, the seal bag adheres to the outer wall of the sampling bucket under the action of the cement slurry. Release a slightly longer section of the sealing rope so that the sealing rope inside the rope sleeve is no longer in a tightened state; as the sampling bucket is lowered, sequentially connect the extension rods and use several extension rods to lower the sampling bucket to the target depth.

[0056] Step S3: Seal the bottom opening of the sampling bucket.

[0057] When the sampling bucket is lowered to the target depth, keep the extension rod stationary, repeatedly and slowly release and slowly lift the sealing rope so that the free end of the seal bag slowly detaches from the outer wall of the sampling bucket and moves downward to below the sampling bucket;

[0058] Keep the extension rod stationary, lift the sealing rope so that the free end of the seal bag extends from the bottom opening of the sampling bucket into the bottom of the internal cavity of the sampling bucket, tighten the sealing rope, and make the knot of the knotted rope slide along the rope body, forcing the free ends of the seal bag to be tightened together, thereby sealing the bottom opening of the sampling bucket.

[0059] Step S4: Remove the sampling bucket.

[0060] Lift the sampling bucket and synchronously lift the sealing rope; remove the extension rod. You can remove the extension rods one by one as you lift the sampling bucket, or you can wait until the sampling bucket is taken out and then remove all the extension rods at once and then disassemble the connected extension rods.

[0061] Step S5: Remove the sealing rope from the inside of the sampling bucket on the premise of ensuring no slurry leakage.

[0062] Insert a baffle horizontally at the bottom end of the sampling bucket, cut off the part of the seal bag outside the sampling bucket, and slowly lift the sealing rope so that the remaining seal bag and sealing rope are slowly taken out from the top opening of the sampling bucket.

[0063] Step S6: Static curing.

[0064] Transfer the sampling bucket together with the bottom baffle to a shady place, wrap the sampling bucket with a film to prevent water evaporation, spray water for curing once every 8 hours, and let it stand for 28 days.

[0065] Step S7: Demold and produce the workpiece.

[0066] Remove the sampling bucket, select the upper, middle, and lower parts of the solidified concrete column, prepare two specimens with a thickness of 10 cm each, and polish the top and bottom surfaces of each specimen smoothly.

[0067] The in-situ specimen preparation method for the static drilling and root-embedded pile provided in this embodiment uses the in-situ cement slurry obtained by the in-situ cement slurry sampling device of the static drilling and root-embedded pile. After the in-situ cement slurry solidifies, remove the sampling bucket, take out the cement column, intercept two sections each from the upper, middle, and lower parts, prepare 6 in-situ cement soil (slurry) specimens, and use the prepared specimens to conduct compressive strength tests to judge the quality of the pile foundation so as to implement remedial measures.

[0068] Although the present invention has been described in detail above with general descriptions and specific embodiments, based on the present invention, some modifications or improvements can be made, which are obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection required by the present invention.

[0069] The terms such as "upper", "lower", "left", "right", "middle", etc. cited in this specification are only for the convenience of clear narration and are not used to limit the scope of implementation of the present invention. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope of implementation of the present invention.

Claims

1. A static drill root pile cement slurry in-situ slurry sampling device, characterized in that: include: The sampling barrel (1) is cylindrical and has openings at the top and bottom; A sealing bag (2) is provided with openings at both ends, one end is used as a fixed end and is sleeved on the outside of the bottom of the sampling barrel (1) and fixed, and the other end is used as a free end and a rope loop (21) is provided at the opening of the end, and the rope loop (21) is provided with two through openings distributed at intervals; A sealing rope (3), one end of which is passed through the rope loop (21) at one of the through holes, and is tied to the rope body of the sealing rope (3) after passing through the other through hole, the knotted rope being able to slide along the rope body of the sealing rope (3), and the other end of which enters the internal cavity of the sampling barrel (1) from the bottom opening of the sampling barrel (1) and extends out from the top opening of the sampling barrel (1); A plurality of extension rods (4), adjacent extension rods (4) are detachably connected, and the extension rod (4) at the bottom end is detachably connected to the sampling barrel (1).

2. The in-situ slurry extraction device for statically drilled root pile cement slurry according to claim 1 is characterized in that: The sampling barrel (1) is cylindrical and comprises two semi-cylindrical shells (12). The two semi-cylindrical shells (12) are buckled relative to each other to form a cylindrical barrel. The buckled two semi-cylindrical shells (12) are fixed by a fixing member.

3. The in-situ slurry extraction device for statically drilled root pile cement slurry according to claim 2 is characterized in that: Before fastening, a release agent is applied to the inner side of the shell of the semi-cylindrical barrel (12).

4. The in-situ slurry extraction device for statically drilled root pile cement slurry according to claim 2 is characterized in that: The two buckled semi-cylindrical shells (12) are fixed by a film wrapped around the outside of the cylindrical shell.

5. The in-situ slurry extraction device for statically drilled root pile cement slurry according to claim 1 is characterized in that: It also comprises a plurality of stainless steel screw sleeves (42), the inner sides of both ends of the stainless steel screw sleeves (42) are respectively provided with internal threads, the two ends of the extension rod (4) are respectively provided with stainless steel joints (41), the stainless steel joints (41) are provided with external threads, and adjacent extension rods (4) are connected via the stainless steel screw sleeves (42); the stainless steel screw sleeves (42) are provided on the outer side of the upper part of the sampling barrel (1), and the extension rod (4) at the bottom end is connected to the sampling barrel (1) via the stainless steel screw sleeves (42).

6. The in-situ slurry extraction device for statically drilled root pile cement slurry according to claim 1 is characterized in that: The sampling barrel (1) is a PVC tube, 1.5 m long and 10 cm in diameter; the sealing bag (2) is made of high-toughness plastic; the sealing rope (3) is a high-toughness nylon rope; and the extension rod (4) is a high-strength and high-density carbon fiber tube.

7. A method for preparing an in-situ specimen of a statically drilled rooted pile, characterized in that: The in-situ slurry extraction device for statically drilled root pile cement slurry according to any one of claims 1 to 6 comprises the following steps: Arrange the sampling barrel (1), the sealing bag (2) and the sealing rope (3) so that the sealing bag (2) is located on the peripheral side of the sampling barrel (1), and initially tighten the sealing rope (3) so that the free end of the sealing bag (2) is attached to the outer wall of the sampling barrel (1) to avoid entering the sampling barrel (1) or blocking the bottom opening of the sampling barrel (1), and the free end of the sealing rope (3) is passed through the bottom opening of the sampling barrel (1) and then passed through the top opening of the sampling barrel (1); An extension rod (4) is connected to the upper part of the sampling barrel (1), and the sampling barrel (1) is lowered into the pile hole (5) with cement slurry, and the sealing rope (3) is released synchronously with the descent of the sampling barrel (1). When the sampling barrel (1) is initially inserted into the cement slurry, the sealing bag (2) is attached to the outer wall of the sampling barrel (1) under the action of the cement slurry, and a slightly longer portion of the sealing rope (3) is released, so that the sealing rope (3) in the rope sleeve (21) is no longer in a tightened state; As the sampling barrel (1) is lowered, the extension rods (4) are connected in sequence, and the sampling barrel (1) is lowered to the target depth using a plurality of extension rods (4); When the sampling barrel (1) is lowered to the target depth, the extension rod (4) remains stationary, and the sealing rope (3) is repeatedly and slowly released and slowly lifted, so that the free end of the sealing bag (2) slowly separates from the outer wall of the sampling barrel (1) and moves downward to the bottom of the sampling barrel (1); The extension rod (4) remains stationary, and the sealing rope (3) is lifted, so that the free end of the sealing bag (2) extends from the bottom opening of the sampling barrel (1) to the bottom of the internal cavity of the sampling barrel (1), and the sealing rope (3) is tightened, so that the rope body of the knotted sealing rope (3) slides, forcing the free end of the sealing bag (2) to be tightened together, thereby closing the bottom opening of the sampling barrel (1); The sample extraction bucket (1) is lifted up, and the sealing rope (3) is simultaneously lifted up; Remove the extension rod (4); A baffle is inserted transversely at the bottom of the sampling barrel (1), the portion of the sealing bag (2) outside the sampling barrel (1) is cut off, and the sealing rope (3) is slowly lifted up, so that the remaining sealing bag (2) and the sealing rope (3) are slowly taken out from the open top of the sampling barrel (1); Move the sampling barrel (1) together with the bottom baffle to a cool place, wrap the sampling barrel (1) with a film, spray water every 8 hours for maintenance, and leave it to stand for 28 days; Demoulding, removing the sampling bucket (1), selecting the upper, middle and lower parts of the solidified concrete column, preparing two specimens of 10 cm thickness each, and polishing the top and bottom surfaces of each specimen to make them smooth.

8. The method for preparing in-situ specimens of static drilled rooted piles according to claim 7, characterized in that: When tidying up the sampling barrel (1), apply a release agent to the inner wall of the sampling barrel (1).

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