Prefabricated composite pile suitable for implantation method construction

Abstract

The utility model provides a prefabricated composite pile suitable for implantation method construction, which belongs to the technical field of building foundation engineering, and comprises a concrete prefabricated pile section provided with a first inner hole, and the first inner hole is of an axial through hole structure; the steel pipe pile section is connected with the concrete precast pile section, the steel pipe pile section and the concrete precast pile section are coaxially arranged, the steel pipe pile section is provided with a second inner hole, the second inner hole communicates with the first inner hole to form a through inner hole channel, and the hole diameter of the second inner hole is not smaller than that of the first inner hole. The utility model has the beneficial effects that the pile body at the lower part is designed into the steel pipe pile section, and the steel pipe pile section can be matched with the pile body strength of the concrete precast pile section at the upper part through the thinner pipe wall thickness, so that the diameter of the second inner hole in the steel pipe pile section can be designed to be not smaller than that of the first inner hole, and the second inner hole forms a large-hole structure; therefore, the transition bottleneck is eliminated, the sampling piece can reach the pile bottom directly, jamming is avoided, and the sampling difficulty is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of building foundation engineering relates to a prefabricated combined pile suitable for implantation method construction. BACKGROUND

[0002] In the field of building engineering, implantation pile as an important foundation reinforcement means is widely used in the foundation engineering of various buildings. Figure 3 As shown in the figure, the existing implantation pile structure is usually divided into upper and lower parts, both of which adopt the form of concrete prefabricated pile. In order to improve the utilization rate of pile body material, according to the actual stress state and bearing characteristics of prefabricated pile, the pile body variable diameter technology is usually adopted, so that the outer diameter of the lower section of concrete prefabricated pile section is smaller than that of the upper section of concrete prefabricated pile section. Because the lower section of concrete prefabricated pile section needs to ensure sufficient wall thickness to maintain structural stability while reducing the outer diameter, the inner hole diameter is also reduced accordingly. This design leads to a significant difference in the inner hole diameter between the upper section of concrete prefabricated pile section and the lower section of concrete prefabricated pile section, forming a clear step surface at the connection between the two.

[0003] When carrying out pile foundation quality detection, an important step is to use a special sampling piece to insert from the inner hole of the upper section of concrete prefabricated pile section to the pile bottom to collect rock and soil samples for analyzing the properties of pile end bearing layer and evaluating the overall construction quality of pile foundation. However, due to the narrow inner hole of the lower section of concrete prefabricated pile section and the existence of the clear step surface between the upper and lower sections of concrete prefabricated pile section, the sampling piece is difficult to pass smoothly into the lower section of concrete prefabricated pile section. In addition, during the operation process, the limited space easily leads to the blocking phenomenon of the sampling piece, increasing the sampling difficulty and the risk of damage to the sampling equipment. UTILITY MODEL CONTENTS

[0004] The utility model aims at the above problems existing in the prior art and provides a prefabricated combined pile suitable for implantation method construction.

[0005] The utility model can be realized by the following technical scheme: a prefabricated combined pile suitable for implantation method construction, comprising:

[0006] A concrete prefabricated pile section is provided with a first inner hole, which is an axial through-hole structure;

[0007] A steel pipe pile section is connected with the concrete prefabricated pile section and coaxially arranged with the concrete prefabricated pile section, the steel pipe pile section is provided with a second inner hole, the second inner hole is an axial through-hole structure, the second inner hole is communicated with the first inner hole to form a through inner hole channel, the aperture of the second inner hole is not less than that of the first inner hole, and the first inner hole and the second inner hole are coaxially arranged.

[0008] Preferably, the axial length of the concrete precast pile section is greater than the axial length of the steel pipe pile section.

[0009] Preferably, the diameter of the second inner hole is equal to the diameter of the first inner hole.

[0010] Preferably, the outer wall of the steel pipe pile section is welded with a protrusion, and the protrusion is arranged as at least one of a spiral protrusion, a steel bamboo joint and a stirring protrusion.

[0011] Preferably, the concrete precast pile section is arranged as a reinforced concrete precast member.

[0012] Preferably, the wall thickness of the steel pipe pile section is less than the wall thickness of the concrete precast pile section.

[0013] Preferably, the concrete precast pile section is arranged with a first flange near one end of the steel pipe pile section, the steel pipe pile section is arranged with a second flange near one end of the concrete precast pile section, the first flange is fixedly connected with the second flange, and the inner diameters of the first flange and the second flange are greater than or equal to the diameter of the second inner hole.

[0014] Preferably, the first flange and the second flange are fixedly connected by welding or by bolts.

[0015] Preferably, the outer wall of the steel pipe pile section is fixedly connected with a plurality of reinforcing rib plates arranged in a circumferential direction, and the reinforcing rib plates are fixedly connected with the second flange.

[0016] Preferably, the utility model further comprises a grouting pipe, and the grouting pipe is arranged in the inner hole channel.

[0017] Compared with the prior art, the utility model has the advantages that:

[0018] 1. The lower pile body of the implant pile is designed as a steel pipe pile section, the steel pipe pile section can match the pile body strength of the upper concrete precast pile section through a thinner wall thickness, the second inner hole in the steel pipe pile section can be designed to be not less than the diameter of the first inner hole, the second inner hole forms a large hole structure, the ladder transition surface is eliminated, the sampling member or other tools can directly reach the pile bottom, the jamming is avoided, and the difficulty of sampling or other operations is reduced.

[0019] 2. The wall thickness of the lower steel pipe pile section is reduced, the thinner wall thickness of the steel pipe pile section means that the implant pile can be more easily implanted into the ground, and the situation of undersending (the actual pile top elevation after construction is higher than the designed pile top elevation) is avoided. In addition, under the same compression bearing performance condition, the wall thickness of the steel pipe pile section is smaller than that of the concrete precast pile section, which is more conducive to the upward flow of the bottom cement soil along the inner hole channel and reduces the implant pile sinking resistance.

[0020] 3. The precast concrete pile segment has a first flange at its end, while the corresponding end of the steel pipe pile segment has a second flange. A flange is a ring plate used to connect two pipes or structural components. Flange connections provide a robust and reliable connection method, capable of withstanding large axial forces, shear forces, and torques, ensuring the safety and stability of the connection between the precast concrete pile segment and the steel pipe pile segment. Attached Figure Description

[0021] Figure 1 This is a half-sectional schematic diagram of the implantation post of this utility model.

[0022] Figure 2 This is a schematic diagram of the implantation post of this utility model.

[0023] Figure 3 This is a schematic diagram of the internal structure of an existing implanted post.

[0024] Figure 4 This is a schematic diagram of the structure of the steel pipe pile segment of this utility model, which is provided with spiral protrusions.

[0025] Figure 5 This is a schematic diagram of the structure of the steel pipe pile segment of this utility model, which features spiral protrusions and steel bamboo joints.

[0026] In the figure, 100 is a precast concrete pile segment; 110 is the first inner hole; 120 is the first flange; 200 is a steel pipe pile segment; 210 is the second inner hole; 220 is a protrusion; 230 is the second flange; 240 is a reinforcing rib; and 300 is a grouting pipe. Detailed Implementation

[0027] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0028] like Figure 1 , Figure 2 As shown, a precast composite pile suitable for implantation construction includes: a precast concrete pile segment 100, the precast concrete pile segment 100 having a first inner hole 110, the first inner hole 110 being an axially through hole structure; and a steel pipe pile segment 200, the steel pipe pile segment 200 being connected to the precast concrete pile segment 100 and coaxially arranged, the steel pipe pile segment 200 having a second inner hole 210, the second inner hole 210 being an axially through hole structure, the second inner hole 210 communicating with the first inner hole 110 to form a through inner hole channel, the diameter of the second inner hole 210 being not less than the diameter of the first inner hole 110.

[0029] The concrete precast pile section 100 is the upper structure of the implant pile, which is usually a reinforced concrete structure in the form of a steel reinforcement cage wrapped by concrete pouring, and the first inner hole 110 is arranged inside the concrete precast pile section 100, which is designed as a through-hole structure along the axial direction of the pile. The steel pipe pile section 200 is the lower structure of the implant pile, and the steel pipe pile section 200 is coaxially arranged and connected with the concrete precast pile section 100 to form the lower part of the implant pile. The steel pipe pile section 200 is also provided with a second inner hole 210, which is also a through-hole structure in the axial direction and is in communication with the first inner hole 110 of the concrete precast pile section 100 to form a through inner hole channel, thereby avoiding the bottleneck step surface problem existing in the traditional design.

[0030] The implant pile has the advantages that since the diameter of the second inner hole 210 of the steel pipe pile section 200 is not less than the diameter of the first inner hole 110 of the concrete precast pile section 100, the inner hole of the lower part (the second inner hole 210) is larger than the inner hole of the upper part (the first inner hole 110), and the inner hole channel formed thereby does not form a stepped transition structure with a large upper part and a small lower part, so that the sampling member can smoothly extend into the second inner hole 210 from the first inner hole 110 and is not blocked by the step surface between the upper and lower inner holes, and can smoothly pass through the entire pile body to reach the bottom of the pile. Moreover, since the second inner hole 210 of the lower part is larger, the sampling member is not easily limited in space in the larger second inner hole 210, thereby facilitating sampling.

[0031] It should be noted that the design that the inner hole of the lower part (the second inner hole 210) is larger than the inner hole of the upper part (the first inner hole 110) not only facilitates sampling, but also facilitates the large-particle rock debris / cobbles (sediments) at the bottom of the implant pile to float or flow along the inner hole channel. Specifically, if the large-particle rock debris / cobbles are accumulated at the bottom of the implant pile, the corresponding equipment can easily enter the bottom of the second inner hole 210 from the inner hole channel (i.e., smoothly pass through the entire pile body to reach the bottom of the pile), thereby taking out the large-particle rock debris / cobbles.

[0032] In summary, the implant pile designs the lower pile body as a steel pipe pile section 200, and the steel pipe pile section 200 can match the strength of the pile body of the upper concrete precast pile section 100 through a relatively thin pipe wall thickness, so that the second inner hole 210 in the steel pipe pile section 200 can be designed to be not less than the hole diameter of the first inner hole 110, and the second inner hole 210 is formed as a large-hole structure, thereby eliminating the stepped transition surface, enabling the sampling member or other tools to reach the bottom of the pile, avoiding jamming, and reducing the difficulty of sampling or other operations.

[0033] In principle, the implant pile designs the lower pile body as a steel pipe pile section 200, which can greatly reduce the thickness of the pipe wall and maintain a large outer diameter compared to the lower pile body structure of reinforced concrete, so that the inner hole diameter of the steel pipe pile section 200 can be larger than the inner hole diameter of the upper concrete precast pile section 100.

[0034] It is also necessary to supplement that the design reduces the wall thickness of the lower steel pipe pile section 200. The thinner wall thickness of the steel pipe pile section 200 means that the implant pile can be implanted more easily into the ground, avoiding the situation of under-delivery (the actual pile top elevation after construction is higher than the designed pile top elevation). In addition, under the same compressive bearing capacity conditions, the wall thickness of the steel pipe pile section 200 is smaller than that of the concrete precast pile section 100, which is more conducive to the upward flow of the bottom cement soil along the inner hole channel, reducing the pile sinking resistance of the implant pile.

[0035] The first inner hole 110 and the second inner hole 210 are coaxially arranged. Since the first inner hole 110 and the second inner hole 210 are coaxial, a continuous and unobstructed straight-through path from the top to the bottom is formed.

[0036] The design that the diameter of the second inner hole 210 is not less than the diameter of the first inner hole 110, combined with their coaxial arrangement, eliminates the step surface problem that may occur in traditional designs. This can ensure that both fluid and solid tools can smoothly pass through the entire pile body and reach the bottom of the pile, avoiding the risk of jamming.

[0037] On the basis of the above-mentioned embodiments, the axial length of the concrete precast pile section 100 is greater than the axial length of the steel pipe pile section 200. The steel pipe pile section 200 is actually only a section at the bottom of the concrete precast pile section 100, which can reduce the manufacturing cost on the premise of achieving the purpose.

[0038] On the basis of the above-mentioned embodiments, the diameter of the second inner hole 210 is equal to the diameter of the first inner hole 110.

[0039] Since the diameters of the first inner hole 110 and the second inner hole 210 are the same and coaxially arranged, a straight-through path without obstruction and with consistent diameter is formed inside the entire implant pile. This ensures that whether it is sampling operation, grouting operation or cleaning bottom sediments, tools or fluids can smoothly pass through the entire inner hole channel and reach the bottom of the pile without encountering any bottleneck or resistance caused by size changes.

[0040] As shown in Figure 1 , Figure 2 , Figure 4 , Figure 5 On the basis of the above-mentioned embodiments, the outer wall of the steel pipe pile section 200 is welded with a protruding part 220, and the protruding part 220 is arranged as at least one of a spiral protrusion, a steel bamboo joint and a stirring protrusion.

[0041] The primary function of the protrusion 220 is to prevent the lower sediment from rising to the surface; additionally, it also plays a role in chip removal. The appropriate configuration of the protrusion 220 is selected based on different geological conditions. For example, spiral protrusions help transport large particles such as rock cuttings and pebbles upwards along a spiral path during drilling, thus preventing these deposits from accumulating at the pile bottom and affecting the final position of the implanted pile. Through rotational motion, spiral protrusions can effectively push the sediment at the bottom to the surface or higher, reducing the workload of sediment handling during construction and ensuring good contact between the pile tip and the bearing stratum. Steel bamboo joints typically refer to a series of annular protrusion structures on the outer wall, similar to bamboo segments. They can increase frictional resistance and end resistance to a certain extent, thereby improving the bearing capacity of the pile. Mixing protrusions are designed to cut and mix the surrounding soil or rock during drilling, transforming it into a more easily removed form (such as mud), and pushing these materials to the side or top through rotational motion.

[0042] In traditional construction methods, the presence of sediment at the bottom (large rock fragments and pebbles) often results in the actual pile top elevation being higher than the design requirements, leading to under-pile driving. This design, however, utilizes 200mm steel pipe pile segments with spiral and mixing protrusions, combined with a rotary pile driving process. This effectively removes large particles from the bottom during pile installation, ensuring full contact between the pile tip and the bearing stratum, thus avoiding under-pile driving caused by sediment.

[0043] In this embodiment, the rotary pile feeding process is combined with the pile driving process. The steel pipe pile segment 200 with spiral protrusions and stirring protrusions can act as a drill rod, which is conducive to the upward discharge of large rock fragments and large-diameter pebbles from the bottom.

[0044] like Figure 1 , Figure 2 As shown, based on the above implementation method, the precast concrete pile segment 100 is set as a precast reinforced concrete component.

[0045] Based on the above implementation method, the wall thickness of the steel pipe pile segment 200 is less than the wall thickness of the precast concrete pile segment 100.

[0046] Thinner steel pipe pile segments with a wall thickness of 200 mm make it easier to press or screw the pile into the ground during construction, especially when it is necessary to penetrate complex geological layers (such as thick moderately weathered rock layers, thick gravel layers, etc.).

[0047] By reducing the wall thickness of the steel pipe pile segment 200, it can be ensured that the diameter of its second inner hole 210 is not less than the diameter of the first inner hole 110 of the precast concrete pile segment 100, thus forming a continuous internal through hole with a consistent diameter. This design facilitates the smooth passage of sampling tools or other operating equipment through the entire pile body to the bottom of the pile, avoiding obstruction problems.

[0048] It should be noted that even if the wall thickness of the steel pipe pile section 200 is small, due to the high strength characteristics of the steel itself, it can still provide sufficient compressive strength and structural strength to meet engineering requirements. Compared with traditional concrete piles, while maintaining the same compressive bearing capacity, the steel pipe pile section 200 can achieve a larger inner hole diameter through a thinner wall thickness.

[0049] As shown in Figure 1 , Figure 2 based on the above embodiments, the concrete precast pile section 100 is provided with a first flange 120 near one end of the steel pipe pile section 200, and the steel pipe pile section 200 is provided with a second flange 230 near one end of the concrete precast pile section 100, and the first flange 120 and the second flange 230 are fixedly connected.

[0050] The end of the concrete precast pile section 100 is provided with a first flange 120, and the corresponding end of the steel pipe pile section 200 is provided with a second flange 230. The flange is a ring-shaped plate used to connect two pipes or structural members. Flange connection provides a solid and reliable connection method that can withstand large axial force, shear force and torque, ensuring the safety and stability of the connection between the concrete precast pile section 100 and the steel pipe pile section 200.

[0051] The design of the flange helps to accurately align the concrete precast pile section 100 and the steel pipe pile section 200, ensuring that they are coaxially arranged, avoiding the problem of discontinuity of the inner hole passage caused by deviation. In addition, sealing washers or other sealing materials can be added at the flange connection to prevent grout leakage during grouting, ensuring the grouting effect and the integrity of the overall structure.

[0052] Further, the inner diameter of the first flange 120 and the second flange 230 is greater than or equal to the hole diameter of the second inner hole 210. In this way, the flange plate can avoid forming a step to block the sampling tube from extending into the inner hole.

[0053] Based on the above embodiments, the first flange 120 and the second flange 230 are fixedly connected by welding or fixedly connected by bolts.

[0054] High-strength bolts can be used to pass through corresponding bolt holes on the two flanges and be tightened to ensure a firm connection between the two. Welding can also be used for connection.

[0055] Based on the above embodiments, the outer wall of the steel pipe pile section 200 near one end of the concrete precast pile section 100 is fixedly connected with a plurality of reinforcing rib plates 240 distributed in a circumferential direction, and the reinforcing rib plates 240 are fixedly connected with the second flange 230.

[0056] The reinforcing rib 240 increases the joint strength at the connection between the steel pipe pile segment 200 and the precast concrete pile segment 100, improves the bending stiffness at the joint, and adds local support to prevent local buckling or damage.

[0057] By setting reinforcing ribs 240 on the outer wall and fixing them to the second flange 230, the overall structural strength and stability of the implanted pile are greatly enhanced, and the bearing capacity and safety of the flange connection are effectively improved, providing a solid guarantee for the entire implanted pile system.

[0058] like Figure 1 As shown, based on the above-described embodiment, it also includes a grouting pipe 300, which is inserted into the inner hole channel.

[0059] The grouting pipe 300 is designed to pass through the inner channel of the entire implanted pile, extending from the first inner hole 110 of the precast concrete pile segment 100 to the second inner hole 210 of the steel pipe pile segment 200. This layout ensures that the grouting pipe 300 can directly reach the bottom of the pile, so that the grout can be accurately injected into the predetermined position. The grouting pipe 300 is pre-welded to the inside of the steel pipe pile segment 200, which ensures the stability of the grouting pipe 300 during construction and avoids displacement or damage caused by external forces.

[0060] During the pile driving process, high-pressure grouting through the grouting pipe 300 effectively pushes large rock fragments and large-diameter pebbles from the bottom to the periphery of the borehole. This method utilizes the powerful impact of the high-pressure grout to disperse the sediment, reducing its impact on the contact surface between the pile tip and the bearing stratum. High-pressure grouting not only removes obstacles at the bottom but also forms a stable cement-soil reinforcement ring around the pile, enhancing the bond between the pile foundation and the surrounding soil or rock, thereby improving the safety and durability of the overall structure.

[0061] In practice, the precast concrete pile segment 100 and the steel pipe pile segment 200 are driven into the ground by static pressure or vibration until they reach a position about 3-5 meters below the designed pile bottom elevation. Once the predetermined depth is reached, a rotating device is used to drive the steel pipe pile segment 200 to rotate. The spiral protrusions or mixing protrusions 220 on the outer wall of the steel pipe pile segment 200 will play a role in this process. The rotation will cause the surrounding soil or rock particles to move, especially the large rock fragments and pebbles at the bottom, which will be gradually pushed upwards. While the pile is being driven by rotation, high-pressure grouting is carried out through the grouting pipe 300 pre-installed in the steel pipe pile segment 200. The injected grout (usually cement grout) can not only fill the gaps around the pile under high pressure, but also further push the large particles at the bottom to the surrounding area of ​​the borehole with the help of the centrifugal force generated by rotation.

[0062] It should be noted that all directional indications (such as upper, lower, left, right, front, rear, etc.) in the embodiments of the present application are only used to explain the relative position relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications will also change accordingly.

[0063] In addition, the descriptions such as "first", "second", "one" and the like in the present application are only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0064] In the present application, unless otherwise specifically defined and limited, the terms "connection", "fixing" and the like should be understood in a broad sense, for example, "fixing" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0065] In addition, the technical solutions of each embodiment of the present application can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection required by the present application.

Claims

1. A precast composite pile suitable for installation by driving, characterized in that, The utility model relates to a concrete prefabricated pile segment (100) and a steel pipe pile segment (200) connected with the concrete prefabricated pile segment (100) and coaxially arranged. The concrete prefabricated pile segment (100) is provided with a first inner hole (110) arranged as an axial through-hole structure. The steel pipe pile segment (200) is provided with a second inner hole (210) arranged as an axial through-hole structure, which is in communication with the first inner hole (110) to form a through inner hole channel.

2. A precast composite pile suitable for installation by driving, according to claim 1, wherein: The axial length of the concrete prefabricated pile segment (100) is greater than that of the steel pipe pile segment (200).

3. A precast composite pile suitable for installation by driving, according to claim 1 or 2, wherein: The diameter of the second inner hole (210) is equal to that of the first inner hole (110).

4. A precast composite pile suitable for installation by driving, according to claim 1, wherein: The outer wall of the steel pipe pile segment (200) is welded with a protruding part (220) arranged as at least one of a spiral protrusion, a steel bamboo joint and a stirring protrusion.

5. A precast composite pile suitable for installation by driving, according to claim 1, wherein: The concrete prefabricated pile segment (100) is arranged as a reinforced concrete prefabricated part.

6. A precast composite pile suitable for installation by driving, according to claim 1 or 5, wherein: The wall thickness of the steel pipe pile segment (200) is less than that of the concrete prefabricated pile segment (100).

7. A precast composite pile suitable for installation by driving, according to claim 1, wherein: The concrete prefabricated pile segment (100) is provided with a first flange (120) near one end of the steel pipe pile segment (200), and the steel pipe pile segment (200) is provided with a second flange (230) near one end of the concrete prefabricated pile segment (100).

8. A precast composite pile suitable for installation by driving, according to claim 7, wherein: The first flange (120) and the second flange (230) are fixedly connected by welding or bolted connection.

9. A precast composite pile suitable for installation by driving, according to claim 7, wherein: The outer wall of the steel pipe pile segment (200) is fixedly connected with a plurality of reinforcing rib plates (240) arranged in a circumferential direction, which are fixedly connected with the second flange (230).

10. A precast composite pile suitable for installation by driving, according to claim 1, wherein: The utility model further comprises a grouting pipe (300) arranged in the inner hole channel.

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