A pile head structure and an adjustment device for the pile head structure

Abstract

This invention relates to the field of building construction, and more particularly to a pile head structure and an adjustment device for the pile head structure, comprising a precast pile body and a pile head. The precast pile body is a hollow cylindrical structure, and the pile head is located at the end of the precast pile body. The vertical cross-section of the pile head is an inverted frustum structure. A positioning slot is provided on the functional upper surface of the pile head, and a first mounting through hole is provided around the peripheral side of the pile head in contact with the geological layer. Each of the first mounting through holes extends into the positioning slot. When the precast pile body and the pile head are connected, the outer circumferential side of the precast pile body and the positioning slot fit together. This solves the technical problem that the existing pile head structure on precast pile foundations has poor stability when it is connected with relatively soft geological layers, and its reliability will decrease with long-term use.

Description

Technical Field

[0001] This invention relates to the field of building construction, and more particularly to a pile head structure and an adjustment device for the pile head structure. Background Technology

[0002] The pile head structure is a key connection part in pile foundation engineering, and its design directly affects the force transmission performance between the pile and the pile cap or superstructure.

[0003] Pile head structures are installed at the ends of traditional cast-in-place or precast piles to enhance the stability of the connection between the pile and the geological strata or bearing platform.

[0004] Conventional pile heads are often integrally formed with precast piles or separately prepared and then fixedly connected. In actual use, this fixed structure cannot adapt to different geological layers, making it prone to structural changes. This can lead to loosening of the geological layer over time, resulting in a decrease in the fit between the precast pile and the geological layer, ultimately causing loosening and serious consequences.

[0005] Chinese patent application number 202211497721.9 discloses a waterproof structure for pile heads and its construction process. The waterproof structure includes a concrete cushion layer around the pile head, the horizontal height of which is lower than the top height of the pile head. The pile head has an enlarged diameter section formed by secondary pouring, and an arc-shaped connection is provided at the junction of the concrete cushion layer and the enlarged diameter section. A water-stop curb is provided above the enlarged diameter section. A leveling layer is poured on the concrete cushion layer, and a waterproof membrane is laid on the upper surface of the leveling layer, extending to the water-stop curb. A water-stop strip is installed on the water-stop curb. The construction process of the waterproof structure in this application is as follows: laying the concrete cushion layer, installing the mold for secondary pouring, applying waterproof coating, and then sequentially laying the leveling layer, waterproof membrane, plastic film protective layer, fine stone concrete protective layer, and self-waterproof reinforced concrete base slab. This application addresses the problem of water seepage from the interface between the concrete pile and the upper structure in basements. However, in actual use, the technical solution proposed by the above invention only addresses the problem of water seepage at the junction of the concrete pile and the geological layer. When the geological layer is relatively soft, the fit between the pile foundation and the geological layer will become unstable. After a period of time, when gaps appear between the two, water seepage will occur again. Summary of the Invention

[0006] Therefore, in view of the above problems, the present invention proposes a pile head structure and an adjustment device for the pile head structure, which solves the technical problem that the pile head structure on the existing precast pile foundation has poor stability when it is combined with a relatively soft geological layer, and the reliability will decrease with long-term use.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a pile head structure, comprising a precast pile body and a pile head, wherein the precast pile body is a cylindrical structure, and the pile head is disposed at the end of the precast pile body. The vertical cross-section of the pile head is an inverted frustum structure. The pile head is defined to include a functional upper surface, a geological layer contact peripheral surface, and a functional lower surface. A positioning slot is provided on the functional upper surface of the pile head, the positioning slot being disposed at the center of the functional upper surface and extending downward in the vertical direction. The pile head is located on the geological layer contact peripheral surface. A first mounting through hole is provided around the contact side, and each of the first mounting through holes extends into the positioning slot. The horizontal height of each of the first mounting through holes is located above the center of the contact surface of the geological layer. A second mounting through hole is provided on the functional lower surface of the pile head. The second mounting through holes are arranged in a matrix on the functional lower surface and extend upward into the positioning slot. When the precast pile body and the pile head are connected, the outer circumferential side of the precast pile body and the positioning slot fit together.

[0008] Furthermore, the positioning slot extends vertically downwards to a distance of 50-80cm from the horizontal height of the lower surface of the function.

[0009] Furthermore, each of the first mounting through holes is inclined downwards, and the angle between each of the first mounting through holes and the horizontal plane is 45°-60°.

[0010] Furthermore, the pile head is placed on the ground, and by applying downward force to strike the end of the precast pile body, the pile head and the precast pile body are driven into the geological layer together.

[0011] An adjustment device for a pile head structure, applied in the pile head structure, includes a central support base, a first stabilizing rod disposed on the central support base, and a second stabilizing rod disposed in the positioning slot. The first stabilizing rod enters the geological layer through a second mounting through hole, and the second stabilizing rod enters the geological layer through the first mounting through hole. The central support base includes a top punching part, a central support part, and a bottom extension part from top to bottom. The top punching part is used to abut against the end of the precast pile body. The central support part is used to fit tightly against the positioning slot on the pile head. The bottom extension part is used to allow the central support base to smoothly enter the positioning slot. The bottom extension part has an inverted frustum structure.

[0012] Furthermore, a stop is fixedly provided at one end of the second stabilizing insert near the positioning slot. The stop is an arc-shaped plate structure, and its arc is consistent with the arc of the inner circumferential side of the positioning slot. When the second stabilizing insert is fully extended outward, the stop blocks the first mounting through hole.

[0013] Furthermore, a guide channel is provided on the bottom extension, the guide channel is arranged radially from the center point of the bottom extension and extends upward to the intersection of the bottom extension and the central support, and the width of the guide channel is the same as the width of the abutment.

[0014] Furthermore, sliding balls are regularly embedded in the guide channel, and each sliding ball is arranged along the length direction of the guide channel.

[0015] Furthermore, the first stabilizing rod is set perpendicular to the horizontal plane, and the free end of the first stabilizing rod is provided with elastic protrusions at intervals. The surface of each elastic protrusion that contacts the geological layer is an arc surface. Under the action of external force, each elastic protrusion will retract inward to be flush with the outer circumferential side surface of the first stabilizing rod, and push outward when the external force is less than its own elastic force.

[0016] Furthermore, the central support base is provided with a self-locking structure, which includes a positioning rod fixedly disposed on the upper surface of the central support base and a clamping structure disposed on the peripheral side of the positioning rod. The clamping structure includes a clamping hole disposed around the peripheral side of the positioning rod and a magnetic metal rod inserted into the clamping hole. The bottom of the precast pile body is provided with a positioning hole nested with the positioning rod. The inner circumferential side of the positioning hole is provided with a connecting hole nested with the magnetic metal rod. A metal block is fixedly disposed in the connecting hole. When the positioning rod and the positioning hole cooperate with each other until the clamping hole and the connecting hole are at the same horizontal plane, the magnetic metal rod is moved towards the connecting hole by the magnetic attraction of the metal block, thereby connecting the precast pile body and the central support base.

[0017] By adopting the aforementioned technical solution, the beneficial effects of the present invention are:

[0018] 1. The pile head structure and adjustment device proposed in this invention, compared with the existing pile head structure of precast piles, can have a closer fit with the geological layer. As a structural component that directly contacts the geological layer, the existing pile head often cannot fit well with the geological layer during the fitting process due to the softness of the geological layer. Even if a stable fit is made during installation, gaps are easily formed between the two during later use, leading to loosening and instability. The pile head in this invention is an inverted truncated cone structure. The design of the inverted truncated cone structure can ensure that the resistance encountered by the pile head during the process of entering the geological layer is minimized, ensuring that the pile head can smoothly reach the depth of the geological layer. At the same time, the inverted truncated cone structure can vibrate and compact the soil of the surrounding geological layer as the pile head sinks into the geological layer. In addition, the inverted truncated cone structure has better stability than the truncated cone structure for soft geological layers.

[0019] 2. This invention also proposes an adjustment device for use with the matching pile head structure. In this invention, the adjustment device acts as an "intermediary" connecting the precast pile body and the pile head. It can make the connection between the precast pile body and the pile head tighter, and at the same time, it can transmit the pressure borne by the precast pile body to the pile head, making the fit between the pile head and the geological layer tighter. Meanwhile, the precast pile body can directly drive the adjustment device, so that the adjustment device can achieve two beneficial effects: first, it makes the fit between the precast pile body and the pile head tighter and prevents loosening; second, it makes the fit between the pile head and the geological layer tighter through the adjustment device, avoiding gaps and loosening during use, thus achieving the function of connecting the upper and lower layers.

[0020] 3. The adjustment device in this invention mainly utilizes its own structural improvements, including a central support seat. The central support seat directly contacts the precast pile body and transmits force. When the precast pile body abuts against the central support seat, the self-locking structure on the central support seat first activates, making the precast pile body and the central support seat tightly connected. Its innovation lies in the fact that when the bottom of the precast pile body approaches the central support seat, the positioning rod on the upper surface of the central support seat inserts into the positioning hole at the bottom of the precast pile body. Simultaneously, the magnetic metal rod located in the clamping hole on the periphery of the positioning rod is attracted by the metal block and extends outward until one end is in the connection hole, and the other end... When the precast pile is in the clamping hole, the precast pile body and the central support are firmly secured. In order to ensure a stable fit between the pile head and the geological layer, the present invention mainly adopts a first stabilizing rod and a second stabilizing rod. The first stabilizing rod is set on the bottom surface of the central support. As the central support moves downward, it is inserted into the geological layer through the first mounting through hole. The second stabilizing rod is set in the positioning slot. As the central support moves downward, the bottom extension of the central support part abuts against the abutting part of the second stabilizing rod and applies external force to it, causing it to be inserted into the geological layer outward through the first mounting through hole.

[0021] 4. In this invention, a guide channel is provided on the bottom extension of the central support base. The purpose of the guide channel is to better cooperate with the abutment part on the second stabilizing rod. At the same time, sliding balls are regularly embedded in the guide channel, which is also to ensure that the pressure above the central support base is smoothly transmitted to the second stabilizing rod so that it extends outward in the inclined direction and inserts into the geological layer. Attached Figure Description

[0022] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the central support structure of the present invention;

[0025] Figure 3 This is a bottom view of the central support structure of the present invention;

[0026] Figure 4 This is a schematic diagram of the second stable insertion rod structure of the present invention;

[0027] Figure 5 for Figure 1 Enlarged view of point A in the middle;

[0028] Figure 6 for Figure 1Enlarged view at point B in the middle;

[0029] Figure 7 This is a schematic diagram showing the fit between the precast pile body and the central support seat. Detailed Implementation

[0030] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0031] Please see Figures 1-7 This invention provides a pile head structure, including a precast pile body 1 and a pile head 2. The precast pile body 1 is a cylindrical structure, and the pile head 2 is located at the end of the precast pile body 1. The vertical cross-section of the pile head 2 is an inverted frustum structure. The pile head 2 is defined as having a functional upper surface 21, a geological layer contact peripheral surface 22, and a functional lower surface 23. A positioning slot 24 is provided on the functional upper surface 21 of the pile head 2. The positioning slot 24 is located at the center of the functional upper surface 21 and extends downward in the vertical direction. A first mounting through hole 25 is provided around the geological layer contact peripheral surface 22 of the pile head 2. Each of the first mounting through holes 25 extends into the positioning slot 24. The horizontal height of the hole 25 is located above the center of the geological layer contact surface 22. The pile head 2 is provided with a second installation through hole 26 on the functional lower surface 23. The second installation through holes 26 are arranged in a matrix on the functional lower surface 23. The second installation through holes 26 extend upward into the positioning slot 24. When the precast pile body 1 and the pile head 2 are connected, the outer circumferential side of the precast pile body 1 and the positioning slot 24 fit together. The positioning slot 24 extends downward in the vertical direction to a horizontal height 50cm away from the horizontal height of the functional lower surface. Each of the first installation through holes 25 is inclined downward, and the angle between each of the first installation through holes 25 and the horizontal plane is 45°.

[0032] During operation, the pile head 2 is placed on the ground, and the end of the precast pile body 1 is struck downwards, thereby driving the pile head 2 and the precast pile body 1 into the geological layer together.

[0033] This embodiment also proposes an adjustment device that works in conjunction with the aforementioned pile head. This adjustment device for a pile head structure, applied to the pile head structure, includes a central support 4, a first stabilizing rod 5 disposed on the central support 4, and a second stabilizing rod 3 disposed within the positioning slot 24. The first stabilizing rod 5 enters the geological layer K through a second mounting through hole 26, and the second stabilizing rod 3 enters the geological layer K through the first mounting through hole 25. The central support 4, from top to bottom, includes a top impact portion 41, a central support portion 42, and a bottom extension portion 43. The top impact portion 41 is used to abut against the end of the precast pile body 1, and the central support portion 42 is used to abut against the positioning slot 24 on the pile head 2. The positioning slot 24 fits tightly, and the bottom extension 43 is used to allow the central support 4 to smoothly enter the positioning slot 24. The bottom extension 43 is an inverted frustum structure. A stop part 6 is fixedly provided on one end of the second stabilizing rod 3 near the positioning slot 24. The stop part 6 is an arc-shaped plate structure, and its arc is consistent with the arc of the inner circumferential side of the positioning slot 24. When the second stabilizing rod 3 extends outward completely, the stop part 6 blocks the first mounting through hole 25. The stop part 6 is made of a flexible and deformable material. After completely blocking the first mounting through hole 25, it deforms to make the precast pile body 1 and the pile head 2 fit more tightly and have greater friction.

[0034] A guide channel 431 is provided on the bottom extension 43. The guide channel 431 is arranged radially from the center point of the bottom extension 43 and extends upward to the intersection of the bottom extension 43 and the central support 42. The width of the guide channel 431 is the same as the width of the abutment 6. The abutment 6 slides along the guide channel 431. Sliding balls 432 are regularly embedded in the guide channel 431. Each sliding ball 432 is arranged along the length of the guide channel 431. The first stabilizing rod 5 is set perpendicular to the horizontal plane. The free end of the first stabilizing rod 5 is provided with elastic protrusions 51 at intervals. The surface of each elastic protrusion 51 that contacts the geological layer K is an arc surface. Under the action of external force, each elastic protrusion 51 will retract inward to be flush with the outer circumferential side of the first stabilizing rod 5, and push outward when the external force is less than its own elastic force.

[0035] The central support base 4 is provided with a self-locking structure, which includes a positioning top rod 44 fixedly disposed on the upper surface of the central support base 4 and a clamping structure disposed on the peripheral side of the positioning top rod 44. The clamping structure includes a clamping hole 45 disposed around the peripheral side of the positioning top rod 44 and a magnetic metal rod 7 inserted into the clamping hole 45. The bottom of the precast pile body 1 is provided with a positioning hole 11 nested with the positioning top rod 44. The inner circumferential side of the positioning hole 11 is provided with a connecting hole 12 nested with the magnetic metal rod 7. A metal block 8 is fixedly disposed in the connecting hole 12. When the positioning top rod 44 and the positioning hole 11 cooperate with each other until the clamping hole 45 and the connecting hole 12 are on the same horizontal plane, the magnetic metal rod 7 is attracted by the magnetic force of the metal block 8 and moves towards the connecting hole 12, thereby connecting the precast pile body 1 and the central support base 4.

[0036] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0037] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An adjustment device for a pile head structure, applied in a pile head structure, the pile head structure comprising a precast pile body and a pile head, the precast pile body being a cylindrical structure, the pile head being disposed at the end of the precast pile body, the vertical cross-section of the pile head being an inverted frustum structure, the pile head being defined as comprising a functional upper surface, a geological layer contact periphery surface, and a functional lower surface, the pile head having a positioning slot provided on the functional upper surface, the positioning slot being disposed at the center of the functional upper surface and extending downward in the vertical direction, the positioning slot being disposed on the geological layer contact periphery surface of the pile head. A first mounting through hole is arranged around the surface, and each of the first mounting through holes extends into the positioning slot. The horizontal height of each of the first mounting through holes is located above the center of the contact periphery of the geological layer. A second mounting through hole is arranged on the functional lower surface of the pile head, and the second mounting through holes are arranged in a matrix on the functional lower surface, extending upward into the positioning slot. When the precast pile body and the pile head are connected, the outer circumferential side of the precast pile body and the positioning slot fit together. The characteristic of this design is: The adjustment device includes a central support base, a first stabilizing rod disposed on the central support base, and a second stabilizing rod disposed in the positioning slot. The first stabilizing rod enters the geological layer through the second mounting through hole, and the second stabilizing rod enters the geological layer through the first mounting through hole. The central support base includes a top punching part, a central support part, and a bottom extension part from top to bottom. The top punching part is used to abut against the end of the precast pile body. The central support part is used to fit tightly against the positioning slot on the pile head. The bottom extension part is used to allow the central support base to smoothly enter the positioning slot. The bottom extension part has an inverted frustum structure. A stop is fixedly provided at one end of the second stabilizing rod near the positioning slot. The stop is an arc-shaped plate structure, and the arc of the arc is consistent with the arc of the inner circumferential side of the positioning slot. When the second stabilizing rod is fully extended outward, the stop blocks the first mounting through hole. A guide channel is provided on the bottom extension. The guide channel is arranged radially from the center point of the bottom extension and extends upward to the intersection of the bottom extension and the central support. The width of the guide channel is the same as the width of the abutment. Sliding balls are regularly embedded in the guide channel, and each sliding ball is arranged along the length direction of the guide channel; The first stabilizing rod is set perpendicular to the horizontal plane. The free end of the first stabilizing rod is provided with elastic protrusions at intervals. The surface of each elastic protrusion that contacts the geological layer is an arc surface. Under the action of external force, each elastic protrusion will retract inward to be flush with the outer circumferential side of the first stabilizing rod, and push outward when the external force is less than its own elastic force. The central support base is equipped with a self-locking structure, which includes a positioning rod fixedly mounted on the upper surface of the central support base and a clamping structure mounted on the periphery of the positioning rod. The clamping structure includes a clamping hole surrounding the periphery of the positioning rod and a magnetic metal rod inserted into the clamping hole. The bottom of the precast pile body is provided with a positioning hole nested with the positioning rod. The inner circumferential side of the positioning hole is provided with a connecting hole nested with the magnetic metal rod. A metal block is fixedly mounted in the connecting hole. When the positioning rod and the positioning hole are engaged to the point that the clamping hole and the connecting hole are at the same horizontal plane, the magnetic metal rod is attracted by the metal block and moves toward the connecting hole, thereby connecting the precast pile body and the central support base.

2. The adjusting device for a pile head structure according to claim 1, characterized in that: The positioning slot extends vertically downwards to a horizontal height that is 50-80cm away from the horizontal height of the lower surface of the function.

3. The adjusting device for a pile head structure according to claim 2, characterized in that: Each of the first mounting through holes is inclined downwards, and the angle between each of the first mounting through holes and the horizontal plane is 45°-60°.

4. The adjusting device for a pile head structure according to claim 3, characterized in that: The pile head is placed on the ground, and by applying downward force to strike the end of the precast pile body, the pile head and the precast pile body are driven into the geological layer together.

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