Sectional self-locking anchor rod static pressure steel pipe pile

Abstract

This utility model discloses a segmented self-locking anchor static pressure steel pipe pile, relating to the field of building construction technology. The utility model includes a first steel pipe pile with symmetrical fastening structures on both sides: a small conical head connected to a thin fixing column, a slider outside the column, and a thick fixing column with a sliding rail. A support block with a guide channel is connected below the thick fixing column, and a fixing plate is fixed to the bottom. The fixing plate is bolted to the steel pipe pile. This utility model uses cement injection pressure to drive mechanical linkage. The grout pushes the thick fixing column vertically downwards along the sliding rail through the guide channel, forcing the thin fixing column and slider to penetrate the soil layer to form barbed anchor claws, realizing the conversion of fluid pressure into mechanical anchoring force. Simultaneously, the fixing plate, together with the support block, disperses lateral soil pressure to the steel pipe pile body, avoiding stress concentration. The guide channel guides cement to fill the gaps in the anchor claws, forming an integral load-bearing base after solidification, solving the problem of single anchoring failure in traditional anchor bolts.

Description

Technical Field

[0001] This utility model relates to the field of building construction technology, specifically a segmented self-locking anchor static pressure steel pipe pile. Background Technology

[0002] This is a static segmented micro steel pipe pile with integrated self-locking anchoring function. It utilizes static pressure to drive the steel pipe pile into segments, and achieves immediate mechanical anchoring by opening at a predetermined position through the self-locking mechanism on the column. With the possible subsequent grouting, it forms a composite support structure that is fast, low-disturbance, and has high load-bearing efficiency. It is widely applicable to underground engineering, deep foundation pit and slope engineering that require rapid stability and low environmental impact. Existing static pressure steel pipe piles suffer from instability during construction. In ultra-deep foundation pit construction, the length-to-diameter ratio of the steel pipe piles increases significantly. During the pressing process, the steel pipe piles are easily subjected to lateral compression by the soil, resulting in radial deformation and causing the actual anchoring trajectory to deviate significantly from the design axis. In view of this, the inventors urgently need to design a segmented self-locking anchor static pressure steel pipe pile to make the steel pipe pile more stable during construction and more fixed in the soil after construction. Utility Model Content

[0003] Based on this, the purpose of this utility model is to provide a segmented self-locking anchor static pressure steel pipe pile to solve the technical problem of instability of static pressure steel pipe piles.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a segmented self-locking anchor static pressure steel pipe pile, comprising a first steel pipe pile, wherein fastening structures are equidistantly installed at symmetrical positions on both sides of the first steel pipe pile, the fastening structure comprising a small cone head, a thin fixing column fixedly installed on the lower side of the small cone head, a slider fixedly connected at symmetrical positions on the outer wall of the thin fixing column, a thick fixing column sleeved on the outer side of the thin fixing column, and a slide rail cooperating with the slider having a symmetrical position on the center of its inner wall, the lower side of the thick fixing column being connected to a support block by bolts, a guide groove having a center position on the support block, and a fixing plate fixedly connected to its lower side, the fixing plate being connected to the first steel pipe pile by bolts.

[0005] By adopting the above technical solution, the fastening structure initiates a secondary anchoring mechanism after the steel pipe piles are initially driven into the stratum. When the cement grout is injected into the stratum, the fluid pressure pushes the coarse fixing column below the small cone head down along the slide rail, forcing the fine fixing column and the slider to penetrate the soil layer simultaneously, forming a deep anchoring claw. This process converts the cement solidification pressure into mechanical embedding force, which significantly enhances the pull-out strength.

[0006] Furthermore, a segmented and detachable second steel pipe pile is provided on the upper side of the first steel pipe pile, and a large conical head is fixedly connected to the lower side.

[0007] By adopting the above technical solution, the segmented and detachable second steel pipe pile solves the industry problems of transporting ultra-long anchor bolts and constructing in confined spaces. By assembling the length on site as needed, the risk of hoisting integral long pipe columns is avoided. At the same time, it supports targeted replacement of damaged pipe sections, significantly reducing maintenance costs.

[0008] Furthermore, the top of the first steel pipe pile is provided with three equidistant limiting grooves, and the bottom of the second steel pipe pile is fixed with three limiting blocks that cooperate with the limiting grooves.

[0009] By adopting the above technical solution, three sets of circumferentially distributed limiting grooves and limiting blocks form an embedded interlocking structure, which enables the two sections of steel pipe piles to automatically achieve precise circumferential positioning when connected. This rigid interlocking can completely constrain the circumferential rotation between pipe sections and ensure that multiple anchor columns maintain axial consistency under torque.

[0010] Furthermore, the top of the first steel pipe pile is fixed with three guide columns at equal intervals, and the bottom of the second steel pipe pile has a guide groove coaxially arranged with the guide columns.

[0011] By adopting the above technical solution, the coaxial nesting mechanism of the guide column and the annular guide groove fundamentally solves the technical problem of on-site alignment of segmented pipe columns. During construction, only the second steel pipe pile needs to be initially connected, and the three guide columns will automatically correct the radial deviation, shortening the time for manual adjustment.

[0012] Furthermore, a pin groove is provided at the center of the limiting block, and a coaxial pin groove is provided at the top of the first steel pipe pile at the corresponding position.

[0013] By adopting the above technical solution, the coaxial pin groove that runs through the two sections of steel pipe pile forms a continuous assembly channel, which creates physical conditions for the precise insertion of tapered pins, avoids the common alignment accumulation error of segmented components, and ensures the success rate of pin penetration in one go.

[0014] Furthermore, a detachable pin is provided in the pin groove, and the pin has a frustum-shaped structure.

[0015] By adopting the above technical solution, the gradually changing cross section of the frustum-shaped pin has dynamic adaptive characteristics when penetrating the limiting block. The thin end is introduced first to reduce the initial resistance, and as the thick end gradually enters the groove, the continuously increasing contact area makes the connection tightness exponentially improved.

[0016] Furthermore, a fixing ring is provided on the outer side of the connection between the first steel pipe pile and the second steel pipe pile, and the inner wall of the fixing ring is provided with threads. The bottom outer wall of the second steel pipe pile is provided with external threads that mesh with the threads.

[0017] By adopting the above technical solution, the core function of the fixing ring is to construct a physical anti-detachment barrier. When its inner wall thread engages with the outer wall of the bottom of the second steel pipe pile, it forms a closed cavity that completely covers the pin, thus completely blocking the risk of pin ejection caused by external rock debris impact or vibration.

[0018] In summary, the present invention has the following main advantages: 1. This utility model uses cement injection pressure to drive mechanical linkage. The grout pushes the coarse fixing column vertically downward along the slide rail through the guide channel, forcing the thin fixing column and the slider to penetrate the soil layer to form a barbed anchor claw, realizing the conversion of fluid pressure into mechanical anchoring force. At the same time, the fixing plate and the support block disperse the lateral soil pressure to the steel pipe pile body, avoiding stress concentration. The guide channel guides cement to fill the gap of the anchor claw, and after solidification, it forms an integral load-bearing base, solving the problem of single anchoring failure of traditional anchor rods. 2. This utility model achieves axial positioning through the interlocking of the segmented steel pipe pile with the limiting groove and the limiting block. The coaxial nesting of the guide column and the guide groove automatically corrects the radial deviation. The triple mechanical constraint ensures that the multi-segment anchor column maintains axial rigidity in complex strata. At the same time, the conical pin penetrates the two pin grooves to form a self-reinforcing wedge locking. The threaded fixing ring is covered with protection to prevent rock debris from impacting the pin and to eliminate the micro gaps at the interface through pre-pressure. The integrated conical surface design of the large conical head simultaneously optimizes the penetration efficiency and anchoring force generation, so that the entire process of transportation, assembly, anchoring and maintenance forms a closed-loop reliable system. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a front view structural diagram of the present utility model; Figure 3 This is a cross-sectional structural diagram of the present invention; Figure 4 This utility model Figure 3 A schematic diagram of the structure at point A in the middle.

[0020] In the diagram: 1. First steel pipe pile; 2. Second steel pipe pile; 3. Large cone head; 4. Fastening structure; 401. Small cone head; 402. Thick fixing column; 403. Thin fixing column; 404. Support block; 405. Guide channel; 406. Fixing plate; 407. Slide rail; 408. Slider; 5. Fixing ring; 6. Guide column; 7. Limiting groove; 8. Guide groove; 9. Limiting block; 10. Pin groove; 11. Pin. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0022] In this embodiment: A segmented self-locking anchor static pressure steel pipe pile, such as Figure 1-4 As shown, the structure includes a first steel pipe pile 1. Fastening structures 4 are symmetrically installed at equal intervals on both sides of the first steel pipe pile 1. Each fastening structure 4 includes a small cone head 401. A thin fixing post 403 is fixedly installed on the lower side of the small cone head 401. A slider 408 is symmetrically connected to the outer wall of the thin fixing post 403. A thick fixing post 402 is sleeved on the outer side of the thin fixing post 403. A slide rail 407, which mates with the slider 408, is symmetrically located at the center of the inner wall of the thick fixing post 402. A support block 404 is bolted to the lower side of the thick fixing post 402. A guide groove 405 is located at the center of the support block 404, and a fixing plate 406 is fixedly connected to its lower side. The fixing plate 406 is bolted to the first steel pipe pile 1. After the steel pipe pile is initially driven into the stratum, the connection and fastening structure 4 initiates a secondary anchoring mechanism. When the cement grout is injected into the stratum, the fluid pressure pushes the coarse fixing column 402 below the small cone head 401 down along the slide rail 407, forcing the thin fixing column 403 and the slider 408 to penetrate the soil layer simultaneously, forming a deep anchoring claw. This process converts the cement solidification pressure into mechanical embedding force, significantly enhancing the pull-out strength. At the same time, the guide groove 405 of the support block 404 guides the cement grout to flow around and fill the gaps. After solidification, it forms an integrated load-bearing base with the thin fixing column 403. The structure of the fixing plate 406 converts the lateral soil pressure into the axial load of the steel pipe pile, solving the problem of easy failure of traditional anchor rods with a single anchoring point.

[0023] See Figure 1 , Figure 2 , Figure 3 The upper side of the first steel pipe pile 1 is equipped with a segmented and detachable second steel pipe pile 2, and the lower side is fixedly connected to a large conical head 3. The segmented and detachable second steel pipe pile 2 solves the industry problem of transporting ultra-long anchor bolts and constructing in confined spaces. By assembling the length on demand on site, the risk of hoisting integral long pipe columns is avoided. At the same time, it supports targeted replacement of damaged pipe sections, significantly reducing maintenance costs. Meanwhile, the large conical head 3, which is integrally formed at the bottom of the first steel pipe pile 1, adopts an integral conical structure. Its continuous smooth conical surface forms a progressive soil expansion during static pressure penetration. The front sharp cone efficiently penetrates the hard interlayer, and the middle and rear conical surface continuously squeezes the surrounding soil layer to form a dense bearing ring, thereby improving the initial anchor bearing capacity. The seamless connection between the cone head and the steel pipe pile eliminates the risk of fatigue cracking at the welding joint and ensures the structural integrity of the anchor bolt system throughout its entire life cycle.

[0024] See Figure 3The top of the first steel pipe pile 1 is provided with three equidistant limiting grooves 7, and the bottom of the second steel pipe pile 2 is fixed with three equidistant limiting blocks 9 that cooperate with the limiting grooves 7. The three sets of circumferentially distributed limiting grooves and limiting blocks form an embedded locking structure, which enables the two steel pipe piles to automatically achieve precise circumferential positioning when connected. This rigid interlocking can completely constrain the circumferential rotation between pipe sections, ensuring that the multiple anchor columns maintain the same axis under the action of torque. At the same time, the pin groove in the center of the limiting block is a high-level fastening reserved passage. The through-hole design of the groove gives the connection node a double locking potential, which greatly improves the redundant protection capability against sudden impact loads.

[0025] See Figure 3 The top of the first steel pipe pile 1 is fixed with three guide columns 6 at equal intervals in the circumference. The bottom of the second steel pipe pile 2 has a guide groove 8 coaxially set with the guide columns 6. The coaxial nesting mechanism of the guide columns and the annular guide groove fundamentally solves the technical problem of on-site alignment of segmented pipe piles. During construction, only the second steel pipe pile needs to be initially connected, and the three guide columns will automatically correct the radial deviation, shortening the time for manual adjustment. At the same time, the full fit between the side of the guide column and the outer wall of the limiting block forms a circular radial support, which enables the connection node to effectively bear the lateral earth pressure, avoids micro-displacement between pipe sections due to asymmetrical force, and significantly extends the fatigue life of the anchor column system.

[0026] See Figure 3 A pin groove 10 is provided at the center of the limiting block 9, and a coaxial pin groove 10 is provided at the top of the first steel pipe pile 1 at the corresponding position. The coaxial pin grooves that pass through the two sections of the steel pipe pile form a continuous assembly channel, which creates physical conditions for the precise insertion of the conical pin, avoids the common alignment accumulation error of segmented components, and ensures the success rate of the pin penetrating at one time. At the same time, the conical structure of the frustum-shaped pin generates radial expansion force during the hammering process, which causes the pin to generate continuous static friction with the groove wall, forming a self-reinforcing mechanical lock. Even when encountering high-frequency vibration, this wedge-tightening effect can still maintain zero loosening of the anchor point, solving the pain point of easy failure of traditional bolt connections.

[0027] See Figure 3 The pin groove 10 is equipped with a detachable pin 11. The pin 11 has a frustum-shaped structure. The gradually changing cross section of the frustum-shaped pin has dynamic adaptive characteristics when penetrating the limiting block. The thin end is introduced first to reduce the initial resistance. As the thick end gradually enters the groove, the continuously increasing contact area makes the connection tightness exponentially improved. At the same time, its threadless pure mechanical locking structure completely avoids the risk of rust jamming. It can be removed without damage by knocking in the opposite direction during disassembly, which greatly reduces the difficulty of maintenance. The surface contact mode between the conical surface and the groove wall disperses a large amount of shear stress, which is more effective than that of a cylindrical pin in terms of shear resistance.

[0028] See Figure 1 , Figure 2 , Figure 4A fixing ring 5 is provided on the outer side of the connection between the first steel pipe pile 1 and the second steel pipe pile 2. The inner wall of the fixing ring 5 is threaded, and the bottom outer wall of the second steel pipe pile 2 is provided with an external thread that meshes with the thread. The core function of the fixing ring 5 is to construct a physical anti-disengagement barrier. When its inner wall thread meshes with the bottom outer wall of the second steel pipe pile 2, it forms a closed cavity that completely covers the pin 11, completely blocking the risk of pin ejection caused by external rock debris impact or vibration. At the same time, the tightening preload of the fixing ring 5 makes the end faces of the two steel pipe piles fit tightly together, and axial constraint force is superimposed on the pin locking. Its cylindrical structure also acts as a waterproof and mudproof sealing cover, preventing corrosive media from entering the pin groove 10 and extending the service life of the core connector.

[0029] The implementation principle of this embodiment is as follows: In the construction preparation stage, the large conical head 3 at the bottom of the first steel pipe pile 1 is aligned with the pile position, and the static pressure equipment drives the first steel pipe pile 1 to penetrate into the stratum to the set depth. In the segmented assembly stage, the second steel pipe pile 2 is hoisted so that the limiting block 9 at its bottom is aligned with the limiting groove 7 at the top of the first steel pipe pile 1. At the same time, the guide column 6 is inserted into the guide groove 8 for radial positioning. The conical pin 11 is manually embedded through the two pin grooves 10. The threaded fixing ring 5 is tightened to cover the interface. In the cement anchoring stage, cement grout is injected through the central hole of the steel pipe pile. The grout pushes the coarse fixing column 402 down along the slide rail 407 through the guide groove 405 of the support block 404, forcing the thin fixing column 403 and the slider 408 to vertically penetrate into the soil to form auxiliary anchor claws. After solidification, it forms an integral whole with the main anchoring system. In the closing stage, the fixing ring 5 isolates the intrusion of external rock debris, and the wedge-tightening effect of the conical pin 11 inhibits vibration and loosening. Multi-level locking forms a closed-loop anchoring.

[0030] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, and variations are within the scope of the claims of the present invention and are protected by patent law.

Claims

1. A segmented self-locking anchor rod static pressure steel pipe pile, characterized in that: The system includes a first steel pipe pile (1), and fastening structures (4) are installed equidistantly on both sides of the first steel pipe pile (1). The fastening structure (4) includes a small cone head (401), and a thin fixing column (403) is fixedly installed on the lower side of the small cone head (401). A slider (408) is fixedly connected to the outer wall of the thin fixing column (403) at a symmetrical position. A thick fixing column (402) is sleeved on the outer side of the thin fixing column (403). A slide rail (407) that cooperates with the slider (408) is opened at a symmetrical position on the center of its inner wall. A support block (404) is connected to the lower side of the thick fixing column (402) by bolts. A guide groove (405) is opened at the center of the support block (404). A fixing plate (406) is fixedly connected to the lower side of the support block (404). The fixing plate (406) is connected to the first steel pipe pile (1) by bolts.

2. The segmented self-locking anchor static pressure steel pipe pile according to claim 1, characterized in that: The upper side of the first steel pipe pile (1) is provided with a segmented and detachable second steel pipe pile (2) and the lower side is fixedly connected with a large cone head (3).

3. A segmented self-locking anchor static pressure steel pipe pile according to claim 2, characterized in that: The top of the first steel pipe pile (1) is provided with three equidistant limiting grooves (7), and the bottom of the second steel pipe pile (2) is fixed with three limiting blocks (9) that cooperate with the limiting grooves (7).

4. A segmented self-locking anchor static pressure steel pipe pile according to claim 2, characterized in that: The top of the first steel pipe pile (1) is fixed with three guide columns (6) at equal intervals, and the bottom of the second steel pipe pile (2) has a guide groove (8) coaxially arranged with the guide columns (6).

5. A segmented self-locking anchor static pressure steel pipe pile according to claim 3, characterized in that: The center of the limiting block (9) is provided with a pin groove (10), and the top of the first steel pipe pile (1) is provided with a coaxial pin groove (10) at the corresponding position.

6. A segmental self-anchoring j acked static pressure steel pipe pile according to claim 5, characterized in that: The pin groove (10) is provided with a detachable pin (11), which is a frustum-shaped structure.

7. A sectional self-anchoring j acked static pressure steel pipe pile according to claim 1, characterized in that: A fixing ring (5) is provided on the outer side of the connection between the first steel pipe pile (1) and the second steel pipe pile (2). The inner wall of the fixing ring (5) is provided with threads, and the bottom outer wall of the second steel pipe pile (2) is provided with external threads that mesh with the threads.

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