Falling-off type immersed tube pile tip

Abstract

The utility model discloses a falling-off type immersed tube pile tip, which relates to the technical field of pile foundation treatment, is arranged at an opening at the lower end of an immersed tube, and comprises a pile tip and a pile tip joint, an opening at one end of the pile tip joint is fixedly connected to the opening at the lower end of the immersed tube, and an opening at the other end is movably connected with the pile tip; and after the formed immersed tube pile is upwards pulled, the pile tip automatically falls off from the pile tip connector, so that an opening in one end of the pile tip connector forms a discharging opening, and discharging of gravels in the immersed tube is achieved. The utility model not only solves the problem that the construction smoothness is influenced due to difficult discharging caused by small opening angle of the existing pile tip discharging hole, but also solves the problems of low pile sinking speed and low pile forming efficiency caused by large pile forming resistance when the existing pile tip discharging door plate is used for treating a hard soil layer. The falling-off type immersed tube pile tip has the effects of enlarging the discharge port, reducing the pile sinking resistance and improving the pile sinking speed and the pile forming efficiency.

Description

Technical Field

[0001] This utility model relates to the field of pile foundation treatment technology, and more specifically, it relates to a detachable driven pipe pile tip. Background Technology

[0002] In the field of existing immersed tube pile tip technology, such as a Chinese utility model patent with patent authorization announcement number CN 210712828 U, a immersed tube pile shoe is disclosed, which is set at the opening at the lower end of the immersed tube. It includes a first hinge plate, a second hinge plate, a pile tip plate, two hinge plate shaft supports, a hinge plate bushing, and a hinge plate mounting shaft. The two hinge plate shaft supports are fixed to both sides of the lower end of the immersed tube, and the pile tip plate is welded and fixed between the two hinge plate shaft supports. The hinge plate mounting shaft is set between the two hinge plate shaft supports and located above the pile tip plate. The lower ends of the first and second hinge plates are respectively welded to the hinge plate bushings. The first and second hinge plates close upwards and open downwards along the hinge plate mounting shaft. This technical solution adopts a two-lobed hinge structure, which can realize the automatic and smooth closing and opening of the lower opening.

[0003] However, this existing technology has significant drawbacks in practical applications: First, due to the mechanical design of the hinge structure, the opening angle of the discharge port is too small, which increases the resistance to the discharge of concrete or pile materials, seriously affecting the smoothness of construction; Second, in soil layers with hard geological conditions, the discharge port door needs to be opened to more than 60° to ensure the pile penetration efficiency. The existing technology cannot meet the opening angle requirements for construction in hard soil layers, and after the discharge port door is opened, the pile formation resistance is very large, which leads to a decrease in pile driving speed and an increase in equipment energy consumption, especially when working in hard rock and soil layers, the pile formation efficiency is significantly reduced. Utility Model Content

[0004] To address this problem in practical applications, the purpose of this utility model is to propose a detachable driven pipe pile tip, which solves the problems of difficulty in material preparation, high pile forming resistance, and low pile forming efficiency of existing driven pipe pile tips. The specific solution is as follows:

[0005] A detachable driven pipe pile tip is installed at the lower end opening of the driven pipe, including a pile tip and a pile tip joint. One end of the pile tip joint is fixedly connected to the lower end opening of the driven pipe, and the other end is movably connected to the pile tip.

[0006] When the driven pile is pulled up, the pile tip automatically detaches from the pile tip joint so that one end of the pile tip joint opens to form a discharge port.

[0007] Furthermore, the pile tip includes a connecting portion, the outer diameter of which remains constant along its axial direction;

[0008] The pile tip joint is a hollow structure, and its inner diameter remains constant along its axial direction.

[0009] Among them, the inner diameter of the pile tip joint is consistent with the outer diameter of the connecting part, so that the connecting part of the pile tip is fitted into the pile tip joint.

[0010] Furthermore, the pile tip also includes a head, which is a cone.

[0011] Furthermore, the pile tip joint has an external truncated cone structure, and the minimum outer diameter of the truncated cone structure is consistent with the maximum outer diameter of the cone, with the minimum outer diameter portion of the truncated cone structure in contact with the maximum outer diameter portion of the cone.

[0012] Furthermore, the head is a solid structure or has a grooved structure.

[0013] Furthermore, the connecting part has a hollow structure, and its inner diameter remains constant along its axial direction.

[0014] Furthermore, the end of the pile tip joint connected to the immersed tube also includes a fixing part, and the pile tip joint is welded to the lower opening of the immersed tube via the fixing part.

[0015] Furthermore, the fixing part is a hollow structure, and its inner diameter gradually increases from the end near the pile tip joint to the end away from the pile tip joint.

[0016] Furthermore, the pile tip is made of alloy steel, and the pile tip joint is made of cast steel.

[0017] Furthermore, the head of the pile tip and the connecting part are an integral structure.

[0018] Furthermore, the pile tip joint and the fixing part are connected as an integral structure.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0020] This invention provides a detachable driven pipe pile tip composed of a pile tip joint and a pile tip. After the driven pipe is pulled out, the pile tip automatically detaches from the pile tip joint, causing the lower end of the pile tip joint to open into a discharge port. The crushed stone inside the driven pipe falls from the discharge port. This not only solves the problem of the small opening angle of the discharge port of the existing pile tip, which leads to difficulty in material discharge and affects the smoothness of construction, but also solves the problem of the large pile driving resistance when the existing pile tip discharge gate plate is used to deal with hard soil layers, resulting in low pile driving speed and low pile formation efficiency. This invention's detachable driven pipe pile tip has the effects of reducing pile driving resistance, increasing the discharge port, and improving pile driving speed and pile formation efficiency. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure after the pile tip and pile tip joint are connected in Embodiment 1 of this utility model;

[0022] Figure 2This is a schematic diagram of the structure of the pile tip and pile tip joint after separation in Embodiment 1 of this utility model;

[0023] Figure 3 This is a schematic diagram of the external structure of the pile tip in Embodiment 1 of this utility model;

[0024] Figure 4 This is a schematic diagram of the internal three-dimensional structure of the pile tip in Embodiment 1 of this utility model;

[0025] Figure 5 This is a schematic diagram of the external structure of the pile tip joint in Embodiment 1 of this utility model;

[0026] Figure 6 This is a schematic diagram of the internal three-dimensional structure of the pile tip joint in Embodiment 1 of this utility model;

[0027] Figure 7 This is a schematic diagram of the internal structure of the pile tip joint in Embodiment 2 of this utility model.

[0028] Reference numerals: 1. Pile tip; 11. Connecting part; 12. Head; 2. Pile tip joint; 3. Fixing part;

[0029] 100. Discharge port. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0031] Example 1

[0032] A type of detachable driven pile tip is installed at the opening at the lower end of the driven pipe, such as... Figure 1-2 As shown, it includes pile tip 1 and pile tip joint 2. Figure 1 The diagram shown is a structural schematic of the pile tip 1 and pile tip joint 2 after they are connected. Figure 2 The diagram shows the structure after the pile tip 1 and pile tip connector 2 are separated. The pile tip connector 2 is connected to the driven pipe (not shown in the diagram). Both ends of the pile tip connector 2 have openings; one end is fixedly connected to the lower opening of the driven pipe, and the other end is movably connected to the pile tip 1. When the driven pile is completed and pulled up, the pile tip 1 automatically detaches from the pile tip connector 2, allowing one end of the pile tip connector 2 to form a discharge port 100 for material discharge. Figure 2 .

[0033] Specifically:

[0034] like Figure 3-4As shown, the pile tip 1 includes a connecting part 11 and a head 12. Preferably, the connecting part 11 and the head 12 are an integral structure. The connecting part 11 on the pile tip 1 is a sizing body, and the head 12 on the pile tip 1 is a cone.

[0035] Wherein: the outer diameter of the connecting part 11 remains constant along its axial direction. (Connection) Figure 5-6 The pile tip joint 2 is a hollow structure, and its inner diameter remains constant along its axial direction. The inner diameter of the pile tip joint 2 is consistent with the outer diameter of the connecting part 11, so that the connecting part 11 of the pile tip 1 can be fitted into the pile tip joint 2, thereby realizing the movable connection between the pile tip 1 and the pile tip joint 2. When the pipe is driven into a pile and pulled upward, the connecting part 11 automatically detaches from the pile tip joint 2, that is, the pile tip 1 automatically detaches from the pile tip joint 2, and a discharge port is formed at the bottom of the pile tip joint 2 to allow the crushed stone inside the pipe to fall.

[0036] Furthermore, the outer diameter of the connecting part 11 is smaller than the maximum outer diameter of the head 12, and the connecting part 11 is connected to the end face of the maximum outer diameter of the head 12. At this time, the part of the head 12 that protrudes radially from the connecting part 11 forms a limiting part. When the connecting part 11 is sleeved on the pile tip joint 2, the limiting part abuts against the circumferential end face of the pile tip joint 2. When the pipe is driven downward to form a pile, the limiting abutment between the limiting part and the pile tip joint 2 prevents the pile tip 1 from falling off the pile tip joint 2.

[0037] More specifically, back to Figure 3 The cone-shaped head 12 has its pointed tip facing downwards. The cone can be a cylindrical cone or a pyramid. It is preferably a cylindrical cone, and the taper is preferably 60°. The cone-shaped head 12 on the pile tip 1 not only allows it to easily penetrate thick hard layers, but also avoids damage to the discharge gate panel caused by the inability to penetrate hard layers.

[0038] The head 12 can be a solid structure or have an internal grooved structure. A solid structure enhances its strength and durability, ensuring it is less prone to damage during pile driving in hard layers. For an internal grooved structure, see... Figure 4 This can reduce the weight of the pile tip 1 and reduce raw material costs.

[0039] See Figure 4 The connecting part 11 is a hollow structure, and its inner diameter remains constant along its axis. This not only reduces the self-weight of the pile tip 1, making it easier to drive the pile and saving material costs, but also ensures that the uniform inner diameter guarantees balanced force when it is connected to the pile tip joint 2, thus ensuring the stability of the connection.

[0040] See Figure 6 The pile tip joint 2 has an external frustum structure, and the minimum outer diameter of the frustum structure is consistent with the maximum outer diameter of the cone. The part with the minimum outer diameter of the frustum structure is in contact with the part with the maximum outer diameter of the cone. Preferably, the taper of the pile tip joint 2 is slightly greater than or equal to the taper of the head 12 of the pile tip 1. This ensures that the pile tip 1 can penetrate the thick hard layer and helps to reduce the pile driving resistance and improve the pile driving efficiency.

[0041] In addition, the pile tip 1 is made of alloy steel, a material with excellent hardness and wear resistance, capable of withstanding various complex geological conditions. The pile tip joint 2 is made of cast steel.

[0042] Example 2

[0043] The technical features that distinguish this embodiment from Embodiment 1 are as follows: Figure 7 As shown, the end of the pile tip joint 2 connected to the immersed tube also includes a fixing part 3. The pile tip joint 2 and the fixing part 3 are connected as an integral structure. The pile tip joint 2 is welded to the lower end opening of the immersed tube through the fixing part 3.

[0044] The fixing part 3 has a hollow structure. The hollow structure is not only for material discharge, but also for reducing the weight of the fixing part 3 itself, thus reducing weight and saving raw material costs.

[0045] Furthermore, the inner diameter of the fixing part 3 gradually increases from the end near the pile tip joint 2 to the end away from the pile tip joint 2. This creates an inclined inner wall, which facilitates material discharge.

[0046] The specific implementation principle of this utility model is as follows:

[0047] When the immersed tube is driven downwards, the cone-shaped pile tip 1 breaks the rocks to penetrate the thick hard layer. During the pile driving process, the resistance effect after the door panel on the existing immersed tube pile tip is avoided, and the pile formation speed is fast.

[0048] When the immersed tube sinks to the designed depth, it enters the tube lifting stage. During the upward lifting process, the pile tip 1 automatically falls to the bottom of the pile. The opening on the pile tip joint 2 that connects to the pile tip 1 opens to form the discharge port 100. The gravel inside the immersed tube falls into the sinking hole. Since the discharge port 100 is fully open at the end, it solves the problem of material blockage caused by the small opening angle of the discharge port of the existing immersed tube pile tip, and significantly improves the pile formation efficiency.

[0049] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A detachable driven pile tip, located at the lower opening of the driven pipe, characterized in that, It includes a pile tip and a pile tip connector, wherein one end of the pile tip connector is fixedly connected to the lower end opening of the driven tube, and the other end is movably connected to the pile tip. When the driven pile is pulled up, the pile tip automatically detaches from the pile tip joint so that one end of the pile tip joint opens to form a discharge port.

2. The detachable driven pipe pile tip according to claim 1, characterized in that, The pile tip includes a connecting part, the outer diameter of which remains constant along its axial direction. The pile tip joint is a hollow structure, and its inner diameter remains constant along its axial direction. Among them, the inner diameter of the pile tip joint is consistent with the outer diameter of the connecting part, so that the connecting part of the pile tip is fitted into the pile tip joint.

3. The detachable driven pipe pile tip according to claim 2, characterized in that, The pile tip also includes a head, which is a cone.

4. The detachable driven pipe pile tip according to claim 3, characterized in that, The pile tip joint has a frustum-shaped external structure, and the minimum outer diameter of the frustum-shaped structure is the same as the maximum outer diameter of the cone. The minimum outer diameter part of the frustum-shaped structure is in contact with the maximum outer diameter part of the cone.

5. The detachable driven pipe pile tip according to claim 3, characterized in that, The head is either a solid structure or has a grooved structure.

6. The detachable driven pile tip according to claim 2, characterized in that, The connecting part has a hollow structure, and its inner diameter remains constant along its axial direction.

7. The detachable driven pipe pile tip according to claim 1, characterized in that, The pile tip joint also includes a fixing part at one end of the submerged pipe, and the pile tip joint is welded to the lower opening of the submerged pipe via the fixing part.

8. The detachable driven pile tip according to claim 7, characterized in that, The fixing part is a hollow structure, and its inner diameter gradually increases from the end near the pile tip joint to the end away from the pile tip joint.

9. The detachable driven pile tip according to claim 1, characterized in that, The pile tip is made of alloy steel, and the pile tip joint is made of cast steel.

10. The detachable driven pile tip according to claim 3, characterized in that, The top of the pile tip and the connecting part are an integral structure.

11. The detachable driven pipe pile tip according to claim 7, characterized in that, The pile tip joint and the fixing part are connected as an integral structure.

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