Pile splicing structure for plain concrete pile fracture

Abstract

The utility model relates to the technical field of plain concrete pile breakage repair, in particular to a plain concrete pile breakage pile splicing structure, which is characterized in that the lower end of a corrugated pipe is tightly held at the upper end of a plain concrete broken pile lower half section through a hoop steel bar, so that the corrugated pipe and the plain concrete broken pile lower half section can be connected into a whole; the outer side of the corrugated pipe is provided with a concave-convex surface, so that the lateral pressure of backfill soil can be dispersed, the problems that new and old concrete is misplaced in pouring, the corrugated pipe is not firm and easy to fall off and deviate can be solved, a prefabricated reinforced concrete pipe can be replaced by the corrugated pipe, the corrugated pipe is adopted for plain concrete pile fracture pile splicing treatment, the cost is lower, and the manufacturing is simple; the construction time can be shortened, and a plain concrete leveling cushion layer does not need to be arranged below the prefabricated reinforced concrete pipe.

Description

Technical Field

[0001] This utility model relates to the field of plain concrete pile fracture repair technology, and in particular to a plain concrete pile fracture splicing structure. Background Technology

[0002] Currently, insufficient bearing capacity of the foundation is a common problem in building construction. To save on pile foundation construction costs, plain concrete piles are often used to treat the foundation. These plain concrete piles are often constructed using the long spiral drilling and grouting pile technique. This construction method often results in partial collapse of the plain concrete pile and incomplete compaction of the concrete, leading to fracture surfaces in the plain concrete pile. For example... Figure 1 As shown, after the plain concrete pile is constructed, it is located in the original soil 1. However, a fracture surface 4 appears in the middle of the plain concrete pile, dividing it into the lower half 2 and the upper half 3. At this time, the load-bearing capacity of the plain concrete pile is extremely poor and needs to be repaired.

[0003] When a plain concrete pile develops a fracture surface, the bearing capacity of the fractured pile cannot be determined. Therefore, it is necessary to recalculate the location of the replacement pile and the load-bearing point, and then construct a new plain concrete pile at the replacement location to achieve the purpose of replacement. The plain concrete pile with the fracture surface is then rendered useless. This method involves a large amount of work, and the original plain concrete pile with the fracture surface is rendered useless after the replacement pile is rebuilt at the new location, resulting in a lot of material waste and high construction costs. Moreover, the pile group of plain concrete piles is generally constructed in the foundation pit. Since the entire construction period from the calculation of the replacement pile to its completion is long, and the foundation pit is greatly affected by the weather after excavation while waiting for the replacement pile, it is not conducive to rushing the work.

[0004] Utility model patent application number 202220842650.0 discloses a device for repairing broken semi-rigid piles. This device repairs broken semi-rigid piles with fracture surfaces. It includes a precast reinforced concrete pipe, the lower end of which is fitted over the upper part of the broken section of the semi-rigid pile, embedding the top of the broken pile into the pipe to a certain height. A plain concrete leveling layer is placed below the pipe. Post-cast concrete is poured inside the pipe, and the perimeter is backfilled and compacted within the excavation area. Because it eliminates the need to calculate new pile locations and construct new semi-rigid piles, it reduces the workload, shortens the construction period, minimizes material waste, and lowers costs. However, this method requires casting a new precast reinforced concrete pipe according to the diameter of the semi-rigid pile, and repairing the broken semi-rigid pile with the fracture surface through the precast reinforced concrete pipe sleeve. Although it is not as time-consuming, complex and costly as constructing a new semi-rigid pile, the construction time is still long, the procedures are still relatively cumbersome, and the construction cost is still high. In addition, the post-cast concrete in the precast reinforced concrete pipe and the upper concrete of the broken part of the semi-rigid pile are only restricted by the precast reinforced concrete pipe and have no connection relationship. The poor integrity of the two may lead to insufficient bearing capacity of the repaired pile. Utility Model Content

[0005] The purpose of this utility model is to overcome the shortcomings of the existing technology of repairing broken piles with fracture surfaces by using precast reinforced concrete pipe sleeves with newly poured concrete. Although this method is not as time-consuming, complex, and costly as constructing new piles, the construction time is still relatively long, the procedures are still relatively cumbersome, and the construction cost is still relatively high. This utility model provides a structure for splicing broken plain concrete piles.

[0006] In a first aspect, this utility model provides a fracture splice structure for plain concrete piles, comprising:

[0007] The lower half of the plain concrete broken pile is located within the undisturbed soil.

[0008] A corrugated pipe is fitted onto the upper end of the lower half of the plain concrete broken pile. A retaining rod is fitted onto the outer side of the lower end of the corrugated pipe, and the retaining rod tightly holds the lower end of the corrugated pipe to the upper end of the lower half of the plain concrete broken pile.

[0009] Newly poured concrete, which fills the corrugated pipe;

[0010] Backfill soil, which is used to fill the outer side of the corrugated pipe.

[0011] The proposed solution for splicing fractured plain concrete piles utilizes a steel reinforcement sleeve to tightly bind the lower end of the corrugated pipe to the upper end of the lower half of the fractured plain concrete pile. This connects the corrugated pipe and the lower half of the fractured plain concrete pile into a single unit. Furthermore, the corrugated pipe's outer surface has a concave-convex design, which helps to disperse the lateral pressure of the backfill soil. This solution addresses issues such as misalignment between new and old concrete pours, instability of the corrugated pipe, and its tendency to detach or shift. It allows the use of corrugated pipes instead of precast reinforced concrete pipes for splicing fractured plain concrete piles, resulting in lower costs, simpler construction, shorter construction time, and eliminates the need for a plain concrete leveling layer beneath the precast reinforced concrete pipe.

[0012] Preferably, the inner side of the corrugated pipe is a smooth surface. A smooth, unblemished inner side allows for better control of the concrete's density during vibration compaction, preventing voids, honeycomb-like defects, and pitted surfaces from forming in the newly poured concrete.

[0013] Preferably, the inner diameter of the corrugated pipe is 1mm-2mm larger than the outer diameter of the lower half of the plain concrete pile, which facilitates the corrugated pipe being fitted onto the lower half of the plain concrete pile and also helps the reinforcing bars to hold the lower end of the corrugated pipe tightly to the upper end of the lower half of the plain concrete pile.

[0014] Preferably, the bottom surface of the corrugated pipe is located 80mm-120mm from the top surface of the lower half of the plain concrete broken pile.

[0015] This facilitates the use of reinforcing bars to tightly hold the lower end of the corrugated pipe to the upper end of the lower half of the plain concrete broken pile.

[0016] Preferably, the retaining reinforcement is sleeved on the groove on the outer side of the corrugated pipe, which helps the retaining reinforcement to hold the lower end of the corrugated pipe tightly to the upper end of the lower half of the plain concrete broken pile.

[0017] Preferably, a number of vertical reinforcing bars are embedded at the top of the lower half of the plain concrete pile, the vertical reinforcing bars extending out of the top surface of the lower half of the plain concrete pile, and the portion of the vertical reinforcing bars extending out of the top surface of the lower half of the plain concrete pile is embedded in the newly poured concrete.

[0018] By connecting the top of the lower half of the plain concrete broken pile and the newly poured concrete into a whole by using vertical steel bars, the newly poured concrete can be prevented from shifting under subsequent stress, thus better bearing the load and improving its load-bearing capacity.

[0019] Preferably, a borehole is drilled at the top of the lower half of the plain concrete pile, and the vertical reinforcing bar is inserted into the corresponding borehole. This facilitates operation and ensures a good connection between the vertical reinforcing bar and the lower half of the plain concrete pile, thus reducing the impact on the lower half of the plain concrete pile.

[0020] Preferably, the vertical reinforcing bars are connected to the inner wall of the borehole using structural adhesive, which makes the connection convenient and stable.

[0021] Preferably, the vertical reinforcing bars are embedded in the top of the lower half of the plain concrete broken pile for a length of 100mm-150mm to provide sufficient connection strength while reducing the impact on the lower half of the plain concrete broken pile; the vertical reinforcing bars are embedded in the newly poured concrete for a length of 100mm-150mm to enhance connection strength and control costs.

[0022] Preferably, the backfill soil is sand or gravel, which is beneficial for compaction.

[0023] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0024] 1. This utility model provides a structure for splicing fractured plain concrete piles. By using reinforcing steel hoops to tightly hold the lower end of the corrugated pipe to the upper end of the lower half of the broken plain concrete pile, the corrugated pipe and the lower half of the broken plain concrete pile can be connected into a whole. The corrugated pipe has concave and convex surfaces on the outside, which can disperse the lateral pressure of the backfill soil. This can solve the problems of misalignment between new and old concrete pouring, instability of the corrugated pipe, and easy detachment and displacement. It allows the use of corrugated pipes to replace precast reinforced concrete pipes for splicing fractured plain concrete piles. This method is more cost-effective, simpler to manufacture, and can shorten the construction time. Moreover, it eliminates the need to set a plain concrete leveling layer under the precast reinforced concrete pipe.

[0025] 2. This utility model provides a structure for splicing broken plain concrete piles. The top of the lower half of the broken plain concrete pile and the newly poured concrete are connected into a whole by vertical steel bars. This can prevent the newly poured concrete from shifting under subsequent stress, and can better bear the stress and improve the bearing capacity. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of a broken plain concrete pile.

[0027] Figure 2 A schematic diagram showing the cleaning of the upper half of the plain concrete pile and the excavation of the construction pit;

[0028] Figure 3 A schematic diagram showing drilling on the fracture surface of the plain concrete pile in the upper half of the pile.

[0029] Figure 4 A schematic diagram of inserting vertical reinforcing bars into a borehole on the fracture surface of the plain concrete pile in the upper half of the pile.

[0030] Figure 5 A schematic diagram showing how the lower end of a corrugated pipe is fitted onto the top of the lower half of a plain concrete broken pile and fixed with reinforcing steel bars.

[0031] Figure 6 This is a schematic diagram of a fractured splice structure of a plain concrete pile that is ultimately formed after construction.

[0032] Marked in the diagram: 1. Original soil; 2. Lower half of plain concrete pile; 21. Drill hole; 3. Upper half of plain concrete pile; 4. Fault surface of plain concrete pile; 5. Corrugated pipe; 51. Groove; 6. Backfill soil; 7. Newly poured concrete; 9. Vertical reinforcement; 10. Structural adhesive; 11. Construction pit; 12. Stirrup reinforcement. Detailed Implementation

[0033] The present invention will be further described in detail below with reference to specific embodiments. However, it should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0034] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of this utility model is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.

[0035] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0036] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0037] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0038] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "equipped with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0039] Example 1

[0040] like Figures 1-6 As shown, this embodiment provides a structure for splicing a broken plain concrete pile, including: a lower half of the broken plain concrete pile 2, a corrugated pipe 5, newly poured concrete 7, and backfill soil 6.

[0041] The lower half 2 of the plain concrete pile is located within the undisturbed soil 1; the undisturbed soil 1 is the soil layer where the plain concrete pile was first constructed; such as Figure 1 As shown, after the plain concrete pile is constructed, it is located in the original soil 1. However, a fracture surface 4 appears in the middle of the plain concrete pile, dividing it into the lower half 2 and the upper half 3. At this time, the load-bearing capacity of the plain concrete pile is extremely poor and needs to be repaired.

[0042] like Figure 5 As shown, the corrugated pipe 5 is sleeved on the upper end of the lower half section 2 of the plain concrete broken pile, and a hoop steel bar 12 is sleeved on the outer side of the lower end of the corrugated pipe 5. The hoop steel bar 12 tightly holds the lower end of the corrugated pipe 5 to the upper end of the lower half section 2 of the plain concrete broken pile. The corrugated pipe 5 can be a metal pipe or a plastic pipe, and plastic pipe is preferred because it is cheaper.

[0043] In an optional embodiment, the inner diameter of the corrugated pipe 5 is 1mm-2mm larger than the outer diameter of the lower half of the plain concrete pile 2, which facilitates the corrugated pipe 5 to be fitted onto the lower half of the plain concrete pile 2, and also helps the reinforcing steel 12 to hold the lower end of the corrugated pipe 5 tightly to the upper end of the lower half of the plain concrete pile 2.

[0044] In an optional embodiment, the bottom surface of the corrugated pipe 5 is located 80mm-120mm from the top surface of the lower half of the plain concrete pile 2. This facilitates the use of the reinforcing steel 12 to tightly hold the lower end of the corrugated pipe 5 to the upper end of the lower half of the plain concrete pile 2. Furthermore, the bottom surface of the corrugated pipe 5 corresponds to the bottom surface of the construction pit 11, and the bottom surface of the corrugated pipe 5 is located no more than 120mm from the top surface of the lower half of the plain concrete pile 2, which can reduce the excavation depth of the construction pit 11 and thus reduce the construction difficulty.

[0045] In an optional embodiment, the outer side of the bellows 5 is provided with an annular groove 51, corresponding to the bottom of the trough on the outer side of the bellows, where the outer diameter is smallest. For example... Figure 5 As shown, the sleeve steel bar 12 is sleeved on the outer side groove 51 of the corrugated pipe 5, which is beneficial for the sleeve steel bar 12 to hold the lower end of the corrugated pipe 5 tightly to the upper end of the lower half section 2 of the plain concrete broken pile.

[0046] like Figure 6 As shown, newly poured concrete 7 fills the corrugated pipe 5. The material of the newly poured concrete 7 can be the same as that of the lower half 2 of the plain concrete pile. Since the lower end of the corrugated pipe 5 is fitted onto the upper end of the lower half 2 of the plain concrete pile, the compression of the corrugated pipe 5 by the concrete during pouring may cause the corrugated pipe 5 to become unstable and prone to falling off and shifting. This can lead to poor quality of the repaired plain concrete pile formed after the newly poured concrete 7, such as misalignment between the old and new concrete pouring. Furthermore, the backfill soil 6 fills the outside of the corrugated pipe 5, and the pressure of the backfill soil 6 acting on the outside of the corrugated pipe 5 may also cause the corrugated pipe 5 to become unstable and prone to falling off and shifting. This can also lead to poor quality of the repaired plain concrete pile formed after the newly poured concrete 7. If the quality is poor, the lower end of the corrugated pipe 5 can be tightly wrapped with the upper end of the lower half of the plain concrete pile 2 by using the hoop steel bar 12. This can connect the corrugated pipe and the lower half of the plain concrete pile 2 into a whole. The corrugated pipe has concave and convex surfaces on the outside, which can disperse the lateral pressure of the backfill soil. This can solve the problems of misalignment between the old and new concrete pouring, the corrugated pipe being unstable and easy to fall off and deviate. This allows the corrugated pipe 5 to replace the precast reinforced concrete pipe. Using the corrugated pipe 5 for the splicing of broken plain concrete piles is cheaper, simpler to manufacture, can shorten the construction time, and eliminates the need to set a plain concrete leveling pad under the precast reinforced concrete pipe.

[0047] In an optional embodiment, the corrugated pipe 5 can have a structure with concave and convex surfaces on both the inside and outside, that is, circumferential grooves are provided on both the inside and outside. As a preferred option, the inner side of the corrugated pipe 5 is a smooth surface. The smooth inner side of the corrugated pipe without concave or convex surfaces can better control the density of the concrete during the vibration of the freshly poured concrete 7, and avoid phenomena such as voids, honeycomb, and pitted surfaces in the freshly poured concrete 7.

[0048] In optional implementations, such as Figure 4 As shown, several vertical reinforcing bars 9 are embedded at the top of the lower half 2 of the plain concrete pile. These vertical reinforcing bars 9 extend beyond the top surface of the lower half 2 and are embedded within the newly poured concrete 7. By connecting the top of the lower half 2 of the plain concrete pile and the newly poured concrete 7 into a single unit using the vertical reinforcing bars 9, the displacement of the newly poured concrete under subsequent stress can be avoided, resulting in better stress distribution and improved bearing capacity.

[0049] Furthermore, such as Figure 3 As shown, a borehole 21 is drilled at the top of the lower half 2 of the plain concrete pile. The vertical reinforcing bar 9 is inserted into the corresponding borehole 21, which is convenient for operation and provides a good connection between the vertical reinforcing bar 9 and the lower half 2 of the plain concrete pile, reducing the impact on the lower half 2 of the plain concrete pile. The number of boreholes 21 corresponds to the number of vertical reinforcing bars 9, and the number of vertical reinforcing bars 9 is determined according to the actual stress required, and the vertical reinforcing bars 9 should be evenly distributed.

[0050] Furthermore, such as Figure 4 As shown, the vertical reinforcing bar 9 is connected to the inner wall of the drill hole 21 by structural adhesive 10, which is convenient and stable.

[0051] Furthermore, the vertical reinforcing bar 9 is embedded in the top of the lower half of the plain concrete pile 2 for a length of 100mm-150mm, providing sufficient connection strength while reducing the impact on the lower half of the plain concrete pile 2; the vertical reinforcing bar 9 is embedded in the newly poured concrete 7 for a length of 100mm-150mm, enhancing connection strength and controlling costs.

[0052] The construction steps for the fractured splice structure of the plain concrete pile described in this embodiment are as follows:

[0053] Step 1: The location of fracture surface 4 of the plain concrete pile was determined using the low-strain method, avoiding the drawbacks of blind excavation and demolition. Figure 1 As shown.

[0054] Step Two, as follows Figure 2 As shown, the original soil 1 is excavated to 100mm below the top of the lower half of the plain concrete pile 2, forming a construction pit 11, which can solve the problem of misalignment between the old and new concrete pouring. The upper half of the plain concrete pile 3 is then removed, the fracture surface 4 of the plain concrete pile is found and washed, so that the old and new concrete can bond better.

[0055] Step 3, as follows Figure 3 As shown, borehole 21 is formed by drilling at the top of the lower half of the plain concrete broken pile 2;

[0056] Step 4, as follows Figure 4As shown, after the hole 21 is cleaned by blowing ash, structural adhesive 10 is applied to the part of the vertical reinforcing bar 9 that needs to be inserted into the hole 21. Then, the vertical reinforcing bar 9 is inserted into the hole 21, so that the vertical reinforcing bar 9 and the lower half of the plain concrete pile 2 are connected into a whole. This can reduce the displacement of the newly poured concrete under subsequent stress and allow it to bear the stress better.

[0057] Step 5, as follows Figure 5 As shown, a corrugated pipe 5 is vertically inserted into the lower half of the plain concrete pile 2, 100mm below the top surface. A reinforcing bar 12 is used at the groove 51 on the outer side of the corrugated pipe 5 to connect the bottom of the corrugated pipe 5 to the top of the lower half of the plain concrete pile 2, forming a single unit.

[0058] Step Six, as Figure 6 As shown, backfill soil 6 is constructed in the construction pit around the corrugated pipe 5. The backfill soil 6 uses sand or gravel, etc., and is constructed and compacted in layers. Then, concrete is poured into the corrugated pipe 5 and continuously vibrated to compact it until it reaches the top of the corrugated pipe 5 to form newly poured concrete 7. This solves the problem of the broken pile not being able to be vibrated, and can restore the bearing capacity of the broken pile without the need for additional piles. In addition, in the existing technology, the broken pile needs to be poured first and then backfilled after the pile concrete has reached a certain strength, which takes a long time. Moreover, pouring the broken pile first and then backfilling can easily cause the connection between the old and new concrete piles to break. In this application, the newly poured concrete 7 is constructed after backfilling soil 6, which does not require waiting for the strength of the newly poured concrete 7, and the connection between the old and new concrete piles will not break, and the strength is higher.

[0059] The concrete pile fracture splicing structure described in this embodiment uses a corrugated pipe 5 vertically inserted into the lower half 2 of the concrete pile fracture 100mm below the top. A reinforcing bar 12 is used at the bottom groove 51 of the corrugated pipe 5 to connect the corrugated pipe 5 to the lower half 2 of the concrete pile fracture, forming a single unit. This solves the problems of misalignment between the old and new concrete pours, and the instability and easy detachment of the corrugated pipe 5. The smooth inner surface of the corrugated pipe 5 allows for better control of concrete density during vibration, preventing voids and honeycomb-like pitting. The uneven outer surface of the corrugated pipe 5 disperses the lateral pressure of the backfill soil 6, preventing instability and easy detachment during construction. Furthermore, it is more suitable for construction at shallower fractures.

[0060] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A structure for splicing a fractured plain concrete pile, characterized by comprising: The utility model relates to a kind of concrete pile foundation structures, including: Plain concrete pile stub lower half (2), the plain concrete pile stub lower half (2) is located in situ soil (1); Corrugated pipe (5), the corrugated pipe (5) is sleeved in the upper end of the plain concrete pile stub lower half (2), the corrugated pipe (5) lower end outside is sleeved with sleeve reinforcement (12), the sleeve reinforcement (12) is embraced tightly in the upper end of the plain concrete pile stub lower half (2) with the corrugated pipe (5) lower end; Newly-poured concrete (7), the newly-poured concrete (7) fills the corrugated pipe (5); Backfill (6), the backfill (6) is filled in the outside of the corrugated pipe (5).

2. A discontinuous pile construction according to claim 1, wherein, The inside of the corrugated pipe (5) is smooth surface.

3. A discontinuous pile construction according to claim 1, wherein, The inner diameter of the corrugated pipe (5) is 1mm-2mm larger than the outer diameter of the plain concrete pile stub lower half (2).

4. A discontinuous pile construction according to claim 1, wherein, The bottom surface of the corrugated pipe (5) is located at 80mm-120mm from the top surface of the top of the plain concrete pile stub lower half (2).

5. A discontinuous pile splice construction according to claim 1, wherein The sleeve reinforcement (12) is sleeved in the outer surface groove (51) of the corrugated pipe (5).

6. A construction of a discontinuous pile according to any one of claims 1 to 4, characterised in that, The top of the plain concrete pile stub lower half (2) is embedded with several vertical steel bars (9), the vertical steel bars (9) extend out of the top surface of the plain concrete pile stub lower half (2), and the part of the vertical steel bars (9) extending out of the top surface of the plain concrete pile stub lower half (2) is embedded in the newly-poured concrete (7).

7. A discontinuous pile construction according to claim 6, wherein, The top of the plain concrete pile stub lower half (2) is drilled with a drill hole (21), and the vertical steel bars (9) are implanted in the corresponding drill hole (21).

8. A discontinuous pile construction according to claim 7, wherein, The vertical steel bars (9) and the inner wall of the drill hole (21) are connected by structural adhesive (10).

9. A discontinuous pile splice construction according to claim 6, wherein The length of the vertical steel bars (9) embedded in the top of the plain concrete pile stub lower half (2) is 100mm-150mm, and the length of the vertical steel bars (9) embedded in the newly-poured concrete (7) is 100mm-150mm.

10. A construction of a discontinuous pile according to any one of claims 1 to 4, characterised in that, The backfill (6) uses sand or gravel.

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