A bag bottom-expanding rigid-flexible combined pile and a construction method thereof

Abstract

The application relates to a bag expanding bottom rigid-flexible combined pile, which comprises a pipe pile, the outer package of which is provided with a bag at one end in the length direction, a grouting hole penetrating through the pipe pile is arranged in the pipe pile covering area of the bag, the grouting hole is connected with the inside of the bag and the inside of the pipe pile, the bag is wound on the pipe pile, a ring hoop is arranged on the outer sleeve of the bag, the ring hoop is arranged in sliding mode on the pipe pile, and the ring hoop is separated from the bag through sliding. The application has the effect of reducing the influence of the ring hoop on the stability of the combined pile.

Description

Technical Field

[0001] This application relates to the field of composite pile construction, and in particular to a bag-type expanded-base rigid-flexible composite pile and its construction method. Background Technology

[0002] Because rigid piles have a strong load transfer capacity, their ends can be placed in a deeper bearing layer, transferring most of the upper load to a better-quality bearing layer. This significantly reduces the compression of the reinforced soil layer and achieves the goal of controlling settlement. Flexible piles, on the other hand, have a weaker load transfer capacity. Their ends can be placed in a shallower bearing layer to bear part of the load, allowing them to participate in load bearing. By rationally arranging the construction sequence of rigid and flexible piles, and with the addition of a cushion layer, a composite rigid-flexible pile foundation is formed, ensuring that the deformation of the rigid piles, flexible piles, and the soil between the piles coordinates and they jointly bear the load.

[0003] A Chinese invention patent with publication number CN103741683A discloses a bag-enlarged-bottom rigid-flexible composite pile. The main body of the composite pile is composed of the following precast pipe piles connected from top to bottom: TSC pile, PRC pile, and PHC pile. The bottom end of the PHC pile is provided with an enlarged head encased in a bag. Each precast pipe pile has a grouting channel pre-reserved in its wall, and both ends of the pile section are provided with perforated pipe pile joints. The bottom pile section has a grout outlet on its side wall. The composite pile is surrounded by the ground surface. The end of the composite pile encased in the bag is inserted into the ground. Then, concrete is poured into the composite pile, allowing the concrete to enter the bag through the grout outlet and expand the bag. The expanded bag makes the installation of the composite pile more stable.

[0004] Before concrete is poured, the grout bag is tied with a ring and a rubber pad to reduce the impact of the soft grout bag on the installation of the composite pile. However, since the subsequent work is carried out underground, the ring is not easy to remove. The ring will affect the grout expansion of the grout bag, thus affecting the stability of the composite pile. Summary of the Invention

[0005] To reduce the impact of hoop rings on the stability of composite piles, this application provides a bag-shaped expanded-base rigid-flexible composite pile.

[0006] The technical solution provided in this application for a bag-type expanded-base rigid-flexible composite pile is as follows:

[0007] A type of rigid-flexible composite pile with an expanded bottom and a bladder includes a pipe pile. One end of the pipe pile is wrapped with a bladder along its length. A grouting hole is provided in the area of ​​the pipe pile covering the bladder, which connects the inside of the bladder and the inside of the pipe pile. The bladder is rolled up on the pipe pile. A ring is provided on the outer sleeve of the bladder. The ring is slidably disposed on the pipe pile and is detached from the bladder by sliding.

[0008] By adopting the above technical solutions, the hoop can restrict the bag from spreading out before grouting, reducing the impact of the bag on the installation of the pipe pile. The sliding hoop can detach from the bag by sliding, thus facilitating the detachment of the hoop and reducing the impact of the hoop on the stability of the composite pile.

[0009] Optionally, one end of the pipe pile covering bag has an embedding groove, and the bag is rolled up and embedded in the embedding groove.

[0010] By adopting the above technical solution, the groove can be opened to house the bag, so that the groove does not protrude from the pipe pile, which facilitates the insertion of the pipe pile and reduces the probability of damage to the bag during the insertion of the pipe pile.

[0011] Optionally, the outer diameter of the ring hoop is not greater than the outer diameter of the pipe pile.

[0012] By adopting the above technical solution, the outer diameter of the hoop is less than or equal to the outer diameter of the pipe pile, which can reduce the probability of the hoop slipping under the action of external force when the pipe pile is inserted into the ground.

[0013] Optionally, a driving unit is installed at one end of the ring hoop away from the pipe pile, and the driving unit abuts against the end of the pipe pile where the bladder is located.

[0014] By adopting the above technical solution, the drive unit can drive the ring hoop to slide. When the concrete is poured into the pipe pile, the concrete will press on the drive unit, and the weight of the concrete will drive the ring hoop to slide away from the bag.

[0015] Optionally, the drive unit is fixed with several baffles, which abut against the inner wall of the pipe pile to block the grouting hole. Several through holes are opened on the baffles, and when the ring hoop slides away from the bag, the through holes connect to the grouting hole.

[0016] By adopting the above technical solution, the baffle can block the grouting hole and reduce the probability of debris entering the bag before the pipe pile installation is completed.

[0017] Optionally, the outer wall of the ring hoop facing away from the pipe pile is chamfered.

[0018] By adopting the above technical solution, the chamfering reduces the resistance when the hoop slides into the ground.

[0019] Optionally, the pipe pile includes TSC piles, PRC piles and PHC piles, which are connected in sequence to form a pipe pile, and the bag is installed on the PHC pile.

[0020] By adopting the above technical solutions, the TSC pile structure, with its high strength, is placed at the top to reduce the probability of external force damaging the pipe pile. The PHC pile is manufactured using the pre-tensioning method, resulting in high bearing capacity and the ability to resist large cracking bending moments. It has strong working performance, and the pile body can remain intact in harsh construction environments, greatly reducing the occurrence of pile cracking and breakage accidents, making it suitable for deep underground applications. The PRC pile's performance is based on that of the TSC and PHC piles, and it is most suitable for placement in the middle as a transition. The combination of different types of piles makes the pipe piles more suitable for use in the ground.

[0021] Optionally, annular grooves are provided at one end of the TSC pile facing the PRC pile along its length, at both ends of the PRC pile along its length, and at one end of the PHC pile along its length facing the PRC pile. The TSC pile, PRC pile, and PHC pile are evenly connected by annular clamps, which are embedded in the annular grooves.

[0022] By adopting the above technical solution, the opening of the annular groove is used to place the annular clamp, protect the annular clamp, and make the annular clamp less susceptible to external impact during the insertion of the pipe pile.

[0023] Optionally, a flexible pile is cast between the pipe pile and the ground.

[0024] By adopting the above technical solutions, flexible piles have the ability to deform, which can alleviate the impact force generated by external forces on rigid piles.

[0025] A construction method for a rigid-flexible composite pile with an enlarged base and a slab-like structure includes the following steps:

[0026] S1: Drilling: Drill holes of the corresponding diameter and depth in the area where pipe piles need to be installed, according to the required combined pile diameter.

[0027] S2: Pump water, drain the water from the outlet hole;

[0028] S3: Casting flexible piles, which are formed by deep cement mixing or high-pressure jet grouting.

[0029] S4: Insert the pipe pile, insert the pipe pile into the flexible pile;

[0030] S5: Grouting and concrete injection are performed to fill the concrete-filled sump, which expands to reinforce the pipe pile, completing the construction of the composite pile.

[0031] By adopting the above technical solution, the bladder is expanded by pouring concrete, which allows the pipe pile to be more firmly fixed in the ground.

[0032] In summary, this application includes at least one of the following beneficial technical effects:

[0033] 1. The hoop can restrict the bag from spreading out before grouting, reducing the impact of the bag on the installation of the pipe pile. The sliding hoop can be detached from the bag by sliding, which facilitates the removal of the hoop and reduces the impact of the hoop on the stability of the composite pile.

[0034] 2. The groove can be stored in the groove so that the groove does not protrude from the pipe pile, which facilitates the installation of the pipe pile and reduces the probability of damage to the bag during pipe pile installation.

[0035] 3. The drive unit can drive the ring hoop to slide. When the concrete is poured into the pipe pile, the concrete will press on the drive unit, and the weight of the concrete will drive the ring hoop to slide away from the bag.

[0036] 4. The baffle can block the grouting hole and reduce the probability of debris entering the bag before the pipe pile is installed;

[0037] 5. TSC piles have high structural strength and are used at the top to reduce the probability of damage to the pipe piles from external forces. PHC piles are prestressed using the pre-tensioning method, resulting in high bearing capacity and the ability to resist large cracking bending moments. They have strong working performance, and the pile body can remain intact in harsh construction environments, greatly reducing the occurrence of pile cracking and breakage accidents, making them suitable for deep underground locations. PRC piles have performance based on TSC and PHC piles and are most suitable for placement in the middle as a transition. Combining different types of piles makes pipe piles more suitable for use in the ground. Attached Figure Description

[0038] Figure 1 This is a cross-sectional structural diagram of the pipe pile structure in this embodiment.

[0039] Figure 2 This is a cross-sectional structural diagram of the overall structure of this implementation.

[0040] Figure 3 This is a cross-sectional structural diagram of the pipe pile in this embodiment.

[0041] Explanation of reference numerals in the attached drawings: 0. Ground; 1. Pipe pile; 101. TSC pile; 102. PRC pile; 103. PHC pile; 2. Bag; 3. Grouting hole; 4. Ring hoop; 5. Groove; 6. Drive unit; 7. Baffle; 8. Through hole; 9. Chamfer; 10. Ring groove; 11. Clamp; 12. Flexible pile; 13. Sliding groove; 14. Sliding block. Detailed Implementation

[0042] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0043] This application discloses a bag-shaped expanded-base rigid-flexible composite pile, referring to... Figure 1 and Figure 2The system includes cylindrical pipe piles 1, which include TSC piles 101, PRC piles 102 and PHC piles 103. The TSC piles 101, PRC piles 102 and PHC piles 103 are connected in sequence to form the pipe pile 1. The TSC piles 101 have strong structural strength and are used at the top to reduce the probability of external forces damaging the pipe pile 1. The PHC piles 103 are prestressed using the pre-tensioning method, so they have high bearing capacity and can resist large cracking bending moments. It possesses strong working performance, and the pile body can remain intact in harsh construction environments, greatly reducing the occurrence of pile cracking and breakage accidents, making it suitable for deep underground locations. The performance of PRC pile 102 is based on TSC pile 101 and PHC pile 103, and its placement in the middle as a transition is most suitable. The combination of different pile types makes the pipe pile 1 more suitable for underground locations. Annular grooves 10 are formed at the end of TSC pile 101 facing PRC pile 102 along its length, at both ends of PRC pile 102 along its length, and at the end of PHC pile 103 facing PRC pile 102 along its length. TSC pile 101, PRC pile 102, and PHC pile 103 pass evenly through these grooves. The ring clamp 11 is connected and embedded in the annular groove 10. The annular groove 10 is opened to place the annular clamp 11 and protect it, so that the annular clamp 11 is not easily impacted by external forces when the pipe pile 1 is inserted. When the pipe pile 1 is inserted into the ground 0, a flexible pile 12 is poured between the pipe pile 1 and the ground 0. The flexible pile 12 and the rigid pipe pile 1 form a composite pile. The rigid pile has high bending stiffness and bearing capacity and is mainly used to bear vertical loads. The flexible pile 12 has good flexibility, can be bent and deformed, and is mainly used to resist horizontal forces and shear forces. The composite pile has the advantages of both, and the bearing capacity and deformation performance of the composite pile will be improved.

[0044] Reference Figure 1 and Figure 2 One end of the pipe pile 1 is wrapped with a bag 2 along its length. The bag 2 is installed at the end of the PHC pile 103 away from the PRC pile 102 along its length. An annular groove 5 is opened at the end of the PHC pile 103 where the bag 2 is installed. The bag 2 is rolled up and embedded in the groove 5. Grouting holes 3 are opened in the area of ​​the PHC pile 103 covered by the bag 2, penetrating the pipe pile 1. The grouting holes 3 are evenly opened in six rows around the PHC pile 103, with five holes in each row. The grouting holes 3 connect the inside of the bag 2 and the PHC pile 103. Inside the pouch 2, there is a circular hoop 4 on the outer sleeve. The outer diameter of the hoop 4 is not greater than the outer diameter of the PHC pile 103. The hoop 4 is slidably set on the PHC pile 102. The hoop 4 can detach from the pouch 2 by sliding. The hoop 4 can limit the pouch 2 from spreading out before grouting, reducing the impact of the pouch 2 on the installation of the pipe pile 1. The slidably set hoop 4 can detach from the pouch 2 by sliding, thus facilitating the detachment of the hoop 4 and reducing the impact of the hoop 4 on the stability of the composite pile.

[0045] Reference Figure 1 and Figure 3A driving part 6 is installed at the end of the hoop 4 away from the pipe pile 1. The driving part 6 is a driving block. The driving part 6 abuts against the end of the pipe pile 1 where the bag 2 is located, covering the opening of the end of the pipe pile 1 where the bag 2 is located. When concrete is poured inside the pipe pile 1, the weight of the concrete presses on the driving block, causing the driving block to drive the hoop 4 to slide, thereby causing the hoop 4 to disengage from the bag 2. At this time, the bag 2 can be filled and expanded normally. The setting of the driving block facilitates the sliding and disengagement of the hoop 4. Several baffles 7 are fixed on the driving part 6. In this embodiment, six baffles 7 are set. The baffles 7 abut against the inner wall of the pipe pile 1 to block the grouting hole 3. Several through holes 8 are opened on the baffles 7. In this embodiment, each baffle 7 has Five through holes 8 are provided on each of the piles. When the hoop 4 slides away from the bag 2, the through hole 8 connects to the grouting hole 3. In order to ensure that the through hole 8 can be aligned with the grouting hole 3 when the hoop 4 is separated from the bag 2, a sliding groove 13 is provided on the PHC pile 103, and a slider 14 is fixed on the baffle 7. The sliding distance of the hoop 4 is limited by the cooperation of the sliding groove 13 and the slider 14. The endpoint of the sliding distance of the hoop 4 is the point where the grouting hole 3 and the through hole 8 are aligned. The baffle 7 can block the grouting hole 3 and reduce the probability of debris entering the bag 2 before the pipe pile 1 is installed. A chamfer 9 is provided on the outer wall of the hoop 4 away from the pipe pile 1. The chamfer 9 reduces the resistance of the hoop 4 when it slides into the ground 0.

[0046] A construction method for a bag-type expanded-base rigid-flexible composite pile includes the following steps: S1: Drilling, drilling holes of corresponding diameter and depth in the area where pipe piles 1 need to be inserted, according to the required composite pile diameter; S2: Pumping, pumping out the water from the holes using a pump; S3: Casting flexible piles 12, forming flexible piles 12 using deep cement mixing or high-pressure jet grouting; S4: Inserting pipe piles 1, inserting pipe piles 1 into the flexible piles 12, the pipe piles 1 need to be assembled before casting the flexible piles 12; S5: Grouting, pouring concrete, pressing the concrete onto the driving block, causing the hoop 4 to detach from the bag 2, and then the concrete fills the bag 2, expanding the bag 2 to reinforce the pipe piles 1, completing the construction of the composite pile.

[0047] The implementation principle of this application embodiment is as follows: The bag 2 is installed on the end of the PHC pile 103 with the groove 5 and rolled up and placed in the groove 5. Then, the ring 4 is fitted on the outside of the bag 2 by sliding. The PRC pile 102 is installed on the PHC pile 103 by the ring clamp 11. Then, the TSC pile 101 is installed on the PRC pile 102 by the ring clamp 11 to complete the installation of the pipe pile 1. According to the outer diameter of the pipe pile 1 and the thickness of the flexible pile 12 to be constructed, a hole of the corresponding diameter is drilled on the ground 0. After the hole is pumped out and shaped, the flexible pile 12 is formed by the cement deep mixing method or the high-pressure jet grouting method. Then, the pipe pile 1 is inserted into the flexible pile 12 and concrete is poured inside the pipe pile 1. The concrete presses the driving part 6. The driving part 6 drives the ring 4 to disengage from the bag 2 and aligns the through hole 8 with the grouting hole 3. The concrete enters the bag 2 through the grouting hole 3, opens the bag 2 and reinforces the pipe pile 1, thus completing the construction of the combined pile.

[0048] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A flexible-rigid composite pile with an expanded bottom and a plenum, comprising a pipe pile (1), wherein one end of the pipe pile (1) is covered by a plenum (2) along its length, and a grouting hole (3) is provided in the area of ​​the pipe pile (1) covering the plenum (2), the grouting hole (3) connecting the interior of the plenum (2) and the interior of the pipe pile (1), characterized in that: The bag (2) is rolled up on the pipe pile (1), and the bag (2) is covered by a ring hoop (4). The ring hoop (4) is slidably set on the pipe pile (1) and the ring hoop (4) is detached from the bag (2) by sliding. A groove (5) is opened at one end of the pipe pile (1) covering the bag (2), and the bag (2) is rolled up and embedded in the groove (5). The outer diameter of the ring hoop (4) is not greater than the outer diameter of the pipe pile (1). A driving part (6) is installed at the end of the ring hoop (4) away from the pipe pile (1). The driving part (6) abuts against the end of the pipe pile (1) where the bag (2) is located. Several baffles (7) are fixed on the driving part (6). The baffles (7) abut against the inner wall of the pipe pile (1) to block the grouting hole (3). Several through holes (8) are opened on the baffles (7). When the ring hoop (4) slides away from the bag (2), the through holes (8) connect to the grouting hole (3).

2. The bag-shaped expanded-base rigid-flexible composite pile according to claim 1, characterized in that: The outer side wall of the hoop (4) facing away from the pipe pile (1) has a chamfer (9).

3. The bag-shaped expanded-base rigid-flexible composite pile according to claim 1, characterized in that: The pipe pile (1) includes a TSC pile (101), a PRC pile (102) and a PHC pile (103), which are connected in sequence to form the pipe pile (1), and the bag (2) is installed on the PHC pile (103).

4. A bag-type expanded-base rigid-flexible composite pile according to claim 3, characterized in that: The TSC pile (101) has an annular groove (10) at one end of its length toward the PRC pile (102), both ends of the PRC pile (102) have an annular groove (10) at one end of its length toward the PRC pile (102). The TSC pile (101), PRC pile (102) and PHC pile (103) are all connected by annular clamps (11), which are embedded in the annular grooves (10).

5. A bag-shaped expanded-base rigid-flexible composite pile according to claim 1, characterized in that: A flexible pile (12) is poured between the pipe pile (1) and the ground (0).

6. A construction method for the bag-shaped expanded-base rigid-flexible composite pile of claim 5, comprising the following steps: S1: Drill holes in the area where pipe piles (1) need to be installed, according to the required combined pile diameter, drill holes of the corresponding diameter and depth; S2: Pump water, drain the water from the hole; S3: Casting flexible piles (12), forming flexible piles (12) by deep cement mixing or high-pressure jet grouting. S4: Insert the pipe pile (1) into the flexible pile (12); S5: Grouting, pouring concrete to fill the bladder (2), opening the bladder (2) to reinforce the pipe pile (1), and completing the construction of the composite pile.

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