Uplift pile hoop with negative Poisson's ratio structure and construction method of uplift pile hoop
By leveraging the synergistic effect of the sleeve components and anchor bolt components with a negative Poisson's ratio structure, the problem of easy detachment of traditional pile sleeves under large axial tensile forces is solved, achieving high-efficiency pull-out resistance, suitable for port terminals and high-rise building foundations.
Patent Information
- Application Number
- CN202511874735.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-12
- Publication Date
- 2026-03-03
AI Technical Summary
Traditional pile sleeves are prone to detaching from the pile body when subjected to large axial tensile forces, resulting in poor pull-out resistance. They also loosen under cyclic loads, failing to meet the high pull-out resistance requirements of port terminals and high-rise building foundations.
A pull-out pile sleeve with a negative Poisson's ratio structure is designed. Through the synergistic enhancement of radial expansion of the sleeve component and mechanical anchoring of the anchor component, a coupled stress state is formed, which enhances the pull-out resistance and pile-soil interlocking.
It improves the pull-out resistance of the pile sleeve and pile, prevents slippage of the inner cylinder, enhances the interlocking effect between the pile and the soil, and significantly improves the pull-out resistance of the pile foundation.
Smart Images
Figure CN121593468A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to pile foundation technology, belonging to the field of civil engineering, and specifically to an anti-uplift pile sleeve with a negative Poisson's ratio structure and its construction method. Background Technology
[0002] Steel piles have excellent compressive, bending and tensile strength, and can be used to bear vertical or horizontal loads, providing stable support. They are widely used in foundation engineering such as buildings, bridges, and docks. Pile sleeves are important reinforcement components for steel piles. They are welded to the top of steel piles or prestressed concrete pipe piles to prevent damage to the pile head, ensure the verticality and positioning of the pile, and facilitate subsequent pile splicing. Traditional pile sleeves mostly adopt an integral steel ring structure, which mainly relies on friction and mechanical interlocking force with the pile body to provide restraint when the pile body is under stress. However, under large axial tensile forces, traditional pile sleeves are prone to problems such as detachment from the pile body and insufficient restraint, leading to engineering accidents such as pile end damage and pile pull-out. Negative Poisson's ratio materials or structures exhibit lateral expansion under axial tension and have been increasingly used in structural engineering in recent years. However, relying solely on negative Poisson's ratio sleeves still has limitations, mainly in the following aspects: 1. The expansion of the sleeve is limited by the material and structure, and may be insufficient to resist extreme tensile forces. That is, when the pile is subjected to ultimate tensile force, although the sleeve with a negative Poisson's ratio structure can expand to a certain extent, the friction between this collision and the pile body is limited, resulting in poor pull-out resistance. This makes it unsuitable for pile foundation projects requiring high pull-out resistance, such as port and dock engineering and high-rise building foundations. 2. There is a lack of dynamic anchoring mechanism between the sleeve and the pile body, making it prone to loosening under cyclic loads. That is, the environment in which the pile body is located is complex. When the pile body is subjected to cyclic loads, the sleeve with a single negative Poisson's ratio structure lacks synergy with other structures, making the sleeve prone to loosening, reducing shear strength, and causing a decrease in the pile body's bearing capacity and pull-out resistance. Summary of the Invention
[0003] The purpose of this invention is to provide a pull-out pile sleeve with a negative Poisson's ratio structure, which achieves synergistic enhancement of radial expansion self-tightening and mechanical anchoring, prevents slippage of the inner cylinder, forms a coupled force state, and improves pull-out resistance and pile-soil interlocking.
[0004] To achieve the above objectives, a tension pile sleeve with a negative Poisson's ratio structure is provided between adjacent piles, comprising: The sleeve component has an inner cylinder connected to the inside of the pile body. The inner cylinder is provided with a negative Poisson's ratio unit, which causes the inner cylinder to expand radially under tension. Both the sleeve component and the pile body are provided with through holes that are matched in position. An anchor bolt assembly, located inside the pile body, has a vertical rod that moves axially with the pile body under tension, a fixing block fixed on the vertical rod, and multiple anchor bolt units located around the vertical rod; Each anchor unit has a crossbar assembly; one end of the crossbar assembly is rotatably connected to the fixing block, and the other end is tilted upward and can be limited through the through hole and moved outward. When the vertical rod moves upward axially, one end of the horizontal rod assembly extends out of the through hole and outward to the outside of the pile body.
[0005] In some examples of the present invention, the sleeve component further has an outer cylinder arranged coaxially with the inner cylinder and located outside the pile body; The height of the outer cylinder is less than the height of the inner cylinder, and they are fixedly connected to each other by a ring. The upper and lower surfaces of the ring body form vertically arranged slots with the corresponding cylindrical sidewalls, and the adjacent piles are inserted into the corresponding slots and fixed.
[0006] In some examples of the invention, the crossbar assembly has a first crossbar; The anchor unit also includes a support slider, a positioning ring, and a first support rod; The support slider is slidably mounted on the vertical rod; the positioning ring is threaded on the vertical rod and limits the upward movement of the support slider; one end of the first support rod is rotatably mounted on the support slider, and the other end is slidably connected to the first horizontal rod through the support sleeve.
[0007] In some examples of the invention, the crossbar assembly further includes a second crossbar; the anchor unit further includes a second support rod; The fixing blocks are a pair. One end of the first horizontal bar is rotatably mounted on the fixing block located in the middle of the vertical bar, and one end of the second horizontal bar is rotatably mounted on the fixing block located at the lower part of the vertical bar. The second support rod is a telescopic rod, with one end rotatably connected to the support sleeve on the first support rod, and the other end slidably connected to the second crossbar through the support sleeve. The first horizontal bar emerges from the upper pile, and the second horizontal bar emerges from the lower pile.
[0008] In some examples of the present invention, the first crossbar and the second crossbar are provided with threads at one end when they are extended; The bolt rod on the outside of the pile extends into the pile body and connects to the corresponding crossbar. The diameter of the rod head is larger than the diameter of the through hole for limiting.
[0009] In some examples of the present invention, the anchor bolt component further includes a receiving plate; The support plate is fixedly installed at the upper end of the vertical rod; One end of the steel bar inside the pile is connected to the bottommost bearing plate, and the other end is fixedly connected to other bearing plates in sequence and then connected to the top of the pile body. The steel reinforcement inside the pile is in a taut state.
[0010] In some examples of the present invention, the negative Poisson's ratio unit has a plurality of circumferentially spaced and axially staggered negative Poisson's ratio orifices; The negative Poisson ratio cavity has three legs that rotate in the same direction around the center and have an arc structure. The outer sides of the three legs are tangent to each other and located inside an equilateral triangle. Among them, the inner ends of three adjacent legs are tangent to the circle, and the tangents at the outer ends form an equilateral triangle.
[0011] In some examples of the present invention, the height of the equilateral triangle in which the three legs are located is a, the outer end of the leg is rounded with a radius of r, and the radius of the inner arc is R; the inner arc of the leg intersects with the outer arc of the adjacent leg and transitions smoothly, and the distance from the intersection point to the center of the equilateral triangle in which the three legs are located is b. The relationship between distance b and a is: .
[0012] In some examples of the present invention, the annular connection is located at the middle of the inner cylinder and the outer cylinder; the inner cylinder is provided with a partition at the annular location to separate the negative Poisson's ratio units; The pile body is either square or round.
[0013] The purpose of this invention is to provide a construction method for a pull-out pile sleeve with a negative Poisson's ratio structure. The method involves sequentially connecting the sleeve component to the lower pile body, the anchor component to the lower pile body, the sleeve component to the upper pile body, and the anchor component to the upper pile body. The construction is simple and reliable. It achieves synergistic enhancement by combining the radial expansion of the sleeve component under stress for self-tightening with the mechanical anchoring of the anchor component extending to the outside of the pile body, forming a coupled stress state and improving the pull-out resistance and pile-soil interlocking effect.
[0014] A construction method for a tension pile sleeve with a negative Poisson's ratio structure specifically includes the following steps: S1, Install the lower pile body in the designated position; The lower groove formed by the ring body, inner cylinder body, and outer cylinder body is inserted into the lower pile body. The through hole on the inner cylinder body is aligned with the through hole on the lower pile body, thus completing the connection between the sleeve component and the lower pile body. S2, Initially, based on the inner diameter of the pile body, rotate the positioning ring and the second support rod to adjust the unfolding angle of the first horizontal bar and the second horizontal bar relative to the vertical bar, so that the distance from the unfolded end of the second horizontal bar to the unfolded end of the first horizontal bar is consistent with the through hole of the adjacent pile body above and below; The anchor rod is suspended to the inside of the sleeve component by connecting it with a steel cable, so that the end of the second crossbar can be aligned with the through hole of the lower part of the inner cylinder and the lower pile body. The bolt then passes through the through hole from the outside of the lower pile body and connects to the end of the second crossbar, thus completing the connection between the anchor rod component and the lower pile body. S3, Fix the support plate to the vertical rod, and fix the support plate to the steel reinforcement inside the pile; Hoist the upper pile body to a suitable height so that the upper pile body is inserted into the upper groove formed by the ring body, inner cylinder body, and outer cylinder body. The through hole of the upper pile body is aligned with the through hole of the inner cylinder body, thus completing the connection between the sleeve component and the upper pile body. At this point, the end of the first horizontal bar can be aligned with the through hole of the lower part of the inner cylinder and the upper pile body. The bolt then passes through the through hole from the outside of the upper pile body and connects to the end of the first horizontal bar. The steel cable is then released to complete the connection between the anchor rod component and the upper pile body. Then, weld and seal the connection between the sleeve component and the upper and lower side piles. S4. Repeat steps S1-S3 to install the sleeve component and anchor bolt component on the upper and lower pile bodies. The steel bars inside the pile are tightened and connected to the upper and lower adjacent bearing plates, and then connected to the uppermost pile body. Before backfilling the soil around the pile, the pre-tensioned steel bars in the pile drive the bearing plate and vertical rod to generate a certain axial displacement, so that the first horizontal bar and the second horizontal bar extend outward to the design length to form an initial anchorage state; when the pile top is sealed, the upper end of the steel bars in the pile is finally fixed.
[0015] Compared with the prior art, this anti-pull pile sleeve with a negative Poisson's ratio structure has the advantage that one end of the crossbar assembly can be limited through the through hole and move outward. A sleeve component that can expand radially under tension is set between adjacent piles. When the pile is under stress, on the one hand, the inner cylinder expands radially due to the negative Poisson's ratio unit and tightly adheres to the inner wall of the pile, enhancing the circumferential constraint. On the other hand, the vertical rod in the anchor component is pulled and moves upward. The anchor component unfolds relative to the vertical rod. This unfolding allows one end of the anchor component to move in the through hole and extend outward to embed into the soil. Therefore, a synergistic enhancement mechanism of radial self-tightening and mechanical anchoring is achieved. The expansion of the inner cylinder enhances the anchoring effect of the anchor component. The unfolding of the crossbar assembly can prevent the inner cylinder from slipping, forming a coupled stress state and improving the pull-out resistance and pile-soil interlocking effect. Since the anchor assembly also includes a second support rod and a second crossbar, when the vertical rod moves upward, the first crossbar extends out from the through hole on the upper side of the pile body and the second crossbar extends out from the through hole on the lower side of the pile body, so that the corresponding crossbars can be embedded into the soil from the adjacent pile body, increasing the interlocking effect of the anchor rod at different soil bodies and significantly improving the pull-out resistance; and under the action of the second support rod, the first crossbar and the second crossbar can be deployed in conjunction, and the deployment angle of the second crossbar can be adjusted independently; Because of the unique rotational geometry of the negative Poisson's ratio borehole, each vertex of the borehole rotates in the same direction around the geometric center of the equilateral profile. Through periodic arraying, a composite primitive rotational negative Poisson's ratio structure is formed. When the negative Poisson's ratio unit is under axial tension, the negative Poisson's ratio borehole will generate coordinated relative rotation, causing the sleeve to expand significantly radially. At the same time, a portion of the axial tensile energy is converted into the torsional strain energy of the structure, thereby enhancing the circumferential constraint force on the pile body. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the present invention; Figure 2 This is a schematic diagram of the sleeve component in this invention; Figure 3 This is a front view of the sleeve component and the negative Poisson's ratio orifice in this invention. Figure 4 This is a schematic diagram of the anchor bolt component in this invention; Figure 5 This is a schematic diagram showing the supporting slider in the anchor bolt component of the present invention being limited on the vertical rod by the positioning ring; Figure 6 This is a schematic diagram showing the connection between the first crossbar and the fixing block in the anchor bolt component of the present invention; Figure 7 This is a front view of the connection between the anchor bolt component and the pile body in this invention; Figure 8 This is a front view of the second support rod connection in the anchor rod component of the present invention. Figure 8 (Enlarged view of position A in the middle) Figure 9 This is a schematic diagram of the connection of the receiving plate in this invention. Figure 8 (Enlarged view of position B in the middle) Figure 10 This is a front view of the vertical rod in the anchor bolt component of the present invention when it moves under tension; Figure 11 This is a schematic diagram of the invention connected to a square pile body; Figure 12 This is a schematic diagram of the invention connected to a circular pile body; In the figure: 10. Sleeve component, 11. Inner cylinder, 111. Negative Poisson's ratio orifice, 112. Through hole, 113. Partition surface, 12. Outer cylinder, 13. Ring body; 20. Anchor bolt assembly; 21. Vertical rod; 211. Fixing block; 221. Support slider; 222. First support rod; 23. Positioning ring; 24. First horizontal rod; 25. Second horizontal rod; 26. Second support rod; 27. Support sleeve. 30. Pile body; 41. Reinforcing steel bars inside the pile; 42. Bond plate; 50. Bolts. Detailed Implementation
[0017] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention.
[0018] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms “first,” “second,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, “an” or “a” and similar terms do not necessarily indicate a quantity limitation. Terms such as “comprising” or “including” mean that the element or object preceding the word encompasses the element or object listed following the word and its equivalents, without excluding other elements or objects. Terms such as “connected” or “linked” are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as “upper,” “lower,” “left,” and “right” are used only to indicate relative positional relationships; these relative positional relationships may change accordingly when the absolute position of the described object changes.
[0019] like Figure 1 , Figure 2 , Figure 4 , Figure 10 , Figure 11 As shown, a type of tension pile sleeve with a negative Poisson's ratio structure is installed between adjacent pile shafts 30, comprising: The sleeve component 10 has an inner cylinder 11 connected to the inside of the pile body 30. The inner cylinder 11 is provided with a negative Poisson's ratio unit, which causes the inner cylinder 11 to expand radially under tension. Both the sleeve component 10 and the pile body 30 are provided with through holes 112 that are matched in position. Anchor bolt component 20, located inside pile body 30, has a vertical rod 21 that moves axially with the pile body 30 under tension, a fixing block 211 fixed on the vertical rod 21, and multiple anchor bolt units located around the vertical rod 21. Each anchor unit has a crossbar assembly; one end of the crossbar assembly is rotatably connected to the fixing block 211, and the other end is tilted upward and can move within the through hole 112; When the vertical rod 21 moves upward axially, one end of the horizontal rod assembly passes through the sleeve component 10 and the pile body 30 and extends to the outside of the pile body 30.
[0020] Specifically, in the sleeve component 10, the inner cylinder 11 is connected to the inner wall of the pile body 30, and the negative Poisson's ratio unit on it causes the sleeve component 10 to expand radially when the pile body 30 is under tension. In the anchor bolt component 20, the vertical rod 21 is used to respond to the tension of the pile body 30, and the fixing block 211 is used to connect the anchor bolt units. There can be four anchor bolt units, which are evenly arranged in the circumference. The lower end of the horizontal rod assembly is hinged to the fixing block 211, and the upper end is inclined to the axis of the vertical rod 21. The pile body 30 and the sleeve component 10 are provided with through holes 112 that match the position. The end side of the horizontal rod assembly can pass through the through hole 112 and be embedded in the soil outside the pile body 30. like Figure 10 As shown, in the initial use of this anti-tension pile sleeve with a negative Poisson's ratio structure, one end of the crossbar assembly can be limited through the through hole 112 and move outward. Multiple pile bodies 30 can be fixedly connected through this anti-tension pile sleeve. When the pile body 30 is under force, on the one hand, the inner cylinder 11 in the sleeve component 10 expands radially due to the negative Poisson's ratio unit and tightly adheres to the inner wall of the pile body 30, enhancing the circumferential constraint. On the other hand, the vertical rod 21 in the anchor rod component 20 is pulled and moves upward. The anchor rod component 20 unfolds relative to the vertical rod 21. This unfolding causes one end of the anchor rod component 20 to move in the through hole 112 and extend outward to embed into the soil. Therefore, a synergistic enhancement mechanism of radial self-tightening and mechanical anchoring is realized. The expansion of the inner cylinder 11 provides a stable extension space for the anchor rod component 20, increasing the anchoring effect. The unfolding of the crossbar assembly can prevent the inner cylinder 11 from slipping, forming a coupled force state, improving the pull-out resistance and pile-soil interlocking effect.
[0021] In some examples of the present invention, such as Figure 2 , Figure 3 As shown, the sleeve component 10 also has an outer cylinder 12 arranged coaxially with the inner cylinder 11 and located outside the pile body 30; The height of the outer cylinder 12 is less than the height of the inner cylinder 11, and the outer cylinder 12 is fixedly connected to the inner cylinder 11 by a ring 13; The upper and lower surfaces of the ring body 13 form vertically arranged slots with the corresponding cylindrical sidewalls, and the upper and lower adjacent pile bodies 30 are inserted into the corresponding slots and fixed. Specifically, the ring body 13 is located between the inner cylinder 11 and the outer cylinder 12, and the upper and lower surfaces form slots arranged vertically between the corresponding cylinder sidewalls. That is, in the cross section, the inner cylinder 11, the ring body 13 and the outer cylinder 12 form an "H" shaped structure. The upper pile body 30 and the lower pile body 30 are inserted into the corresponding slots with an interference fit, and are sealed and fixed by welding at the joint to enhance the overall rigidity and corrosion resistance. At this time, the upper and lower pile bodies 30 are fixedly connected to the sleeve of this anti-tension pile, and the outer cylinder 12 can be fitted on the outside of the connection of the pile body 30 to protect the connection position of the pile body 30 from soil erosion. The height of the inner cylinder 11 is greater than that of the outer cylinder 12, allowing for sufficient expansion contact surface to act on the pile body 30, increasing friction and thus improving the tensile strength of the pile body 30. The through hole 112 is located on the inner cylinder 11. Based on the H-shaped structure, the through hole 112 on the inner cylinder 11 and the pile body 30 effectively solves the problem of precise positioning and initial angle adjustment between the sleeve component 10 and the anchor component 20, improving construction convenience and installation reliability; Figure 11 , Figure 12 As shown, this anti-tension pile sleeve is applicable to square piles and round piles, and has good engineering applicability.
[0022] In some examples of the present invention, such as Figure 4 , Figure 5 , Figure 6 As shown, the crossbar assembly has a first crossbar 24; The anchor unit also includes a support slider 221, a positioning ring 23, and a first support rod 222; The support slider 221 is slidably mounted on the vertical rod 21; the positioning ring 23 is threadedly mounted on the vertical rod 21 and limits the upward movement of the support slider 221; one end of the first support rod 222 is rotatably mounted on the support slider 221, and the other end is slidably connected to the first horizontal rod 24 through the support sleeve 27. Specifically, the upper end of the vertical rod 21 is provided with an external thread, and the positioning ring 23 is threadedly installed on the vertical rod 21 and limits the support slider 221. This limit can determine the minimum unfolding angle between the axis of the first horizontal rod 24 and the axis of the vertical rod 21, which facilitates construction and installation. The two ends of the first support rod 222 are respectively hinged to the support slider 221 and the support sleeve 27, and the support sleeve 27 slides on the first horizontal rod 24. Initially, the first horizontal bar 24 is unfolded so that one end can be limited through the through hole 112 and move outward. The support slider 221 is located at the uppermost limit position of the vertical bar 21 and is limited by the positioning ring 23. When the vertical bar 21 is pulled upward, the fixing block 211 will drive one end of the first horizontal bar 24 to move upward. Under the adjustment of the first support rod 222, the first horizontal bar 24 is further unfolded and the other end extends out of the through hole 112 and is embedded in the soil outside the pile body 30.
[0023] Furthermore, such as Figure 4 , Figure 5 , Figure 6 , Figure 8 As shown, the crossbar assembly also has a second crossbar 25; the anchor bolt unit also has a second support rod 26; The fixing blocks 211 are a pair. One end of the first horizontal bar 24 is rotatably mounted on the fixing block 211 located in the middle of the vertical bar 21, and one end of the second horizontal bar 25 is rotatably mounted on the fixing block 211 located at the lower part of the vertical bar 21. The second support rod 26 is a telescopic rod, one end of which is rotatably connected to the support sleeve 27 on the first support rod 222, and the other end is also slidably connected to the second crossbar 25 through the support sleeve 27. Among them, the first horizontal bar 24 passes through the upper pile body 30, and the second horizontal bar 25 passes through the lower pile body 30; Specifically, such as Figure 10 As shown, a pair of fixing blocks 211 are respectively installed in the middle and lower part of the vertical rod 21. The fixing block 211 in the middle is used to realize the unfolding of the first horizontal bar 24, and the fixing block 211 in the lower part is used to realize the unfolding of the second horizontal bar 25. The two ends of the second support rod 26 are hinged to the support sleeve 27. The upper support sleeve 27 is slidably connected to the first crossbar 24, and the lower support sleeve 27 is slidably connected to the second crossbar 25. The second support rod 26 allows the first crossbar 24 and the second crossbar 25 to extend and embed into the soil outside the pile body 30 when the vertical rod 21 is pulled upward. In addition, the length of the second support rod 26 can be adjusted, for example, it includes an upper support rod, a lower support rod and a sleeve. The sleeve is threaded in opposite directions to the upper support rod and the lower support rod. When the sleeve is rotated, the upper support rod and the lower support rod can move closer or further away from each other, and the extension of the second support rod 26 can independently adjust the unfolding angle of the second crossbar 25. In this example, when the vertical rod 21 moves upward, the first horizontal rod 24 extends from the through hole 112 of the upper pile body 30 and the second horizontal rod 25 extends from the through hole 112 of the lower pile body 30, so that the corresponding horizontal rods are embedded into the soil from the adjacent pile body 30, increasing the interlocking effect of the anchor rod at different soil bodies and significantly improving the pull-out resistance; and under the action of the second support rod 26, the first horizontal rod 24 and the second horizontal rod 25 can be deployed in conjunction, and the deployment angle of the second horizontal rod 25 can be adjusted independently.
[0024] Furthermore, such as Figure 7 As shown, the first crossbar 24 and the second crossbar 25 are threaded at one end, and this end is aligned with the through hole 112; The bolt 50 on the outside of the pile body 30 extends into the pile body 30 and connects with the corresponding crossbar. The diameter of the bolt head is larger than the diameter of the through hole 112 for limiting. Specifically, when the first crossbar 24 and the second crossbar 25 are aligned with the through hole 112, the bolt 50 is connected to the corresponding crossbar, which can limit the corresponding crossbar and prevent the unfolded end of the corresponding crossbar from leaving the through hole 112. That is, the diameter of the through hole 112 is slightly larger than the diameter of the corresponding crossbar and smaller than the head of the bolt 50. When the anchor bolt component 20 is installed, the anchor bolt component 20 can be located inside the pile body 30 with a gap, and then the bolt 50 is connected to the corresponding crossbar through the through hole 112 to fix the anchor bolt component 20 inside the pile body 30, which facilitates installation. The through hole 112 corresponding to the first crossbar 24 or the second crossbar 25 can be a strip hole of a certain length, with one crossbar passing through the through hole 112 for fixation and the other crossbar passing through the strip hole to reduce installation errors. In addition, when the corresponding crossbar is located in the through hole 112 through the bolt 50, the anchor bolt component 20 can also be supported through the through hole 112. In some examples of the present invention, such as Figures 9 to 12 As shown, the anchor bolt component 20 also includes a receiving plate 42; The receiving plate 42 is fixedly installed at the upper end of the vertical rod 21; One end of the reinforcing bar 41 inside the pile is connected to the bottommost bearing plate 42, and the other end is fixedly connected to other bearing plates 42 in sequence and then connected to the top end of the pile body 30. Among them, the reinforcing steel 41 inside the pile is in a taut state; Specifically, there can be multiple reinforcing bars 41 in the pile, which are connected in an array inside multiple pile bodies 30. Multiple anti-pull pile sleeves are connected in series, that is, the reinforcing bars 41 in the pile are in a taut state. The support plate 42 in the anchor rod component is fixed on the reinforcing bars 41 in the pile and is in a taut state. When the pile body 30 is displaced under tension, the reinforcing steel 41 inside the pile will drive the bearing plate 42 to move, thereby driving the vertical rod 21 to move upward. Since the end limit of the horizontal rod assembly is connected to the through hole 112, the corresponding horizontal rod is further extended and embedded in the soil outside the pile body 30.
[0025] In some examples of the present invention, such as Figure 2 , Figure 3 As shown, the negative Poisson's ratio unit has multiple negative Poisson's ratio orifices 111 arranged circumferentially spaced and axially staggered. The negative Poisson ratio pore body 111 has three legs that rotate in the same direction around the center and have an arc structure. The outer sides of the three legs are tangent to each other and located inside an equilateral triangle. Among them, the inner ends of three adjacent legs can be tangent to the circle, and the tangents at the outer ends can form an equilateral triangle; Specifically, the negative Poisson's ratio orifice 111 has a unique rotational geometry, in which each vertex rotates in the same direction around the geometric center point of the equilateral contour, forming a negative Poisson's ratio structure of composite primitive rotation through a periodic array; When the negative Poisson's ratio element is under axial tension, the negative Poisson's ratio orifice 111 will generate coordinated relative rotation, causing the sleeve to expand significantly radially, and at the same time converting part of the axial tensile energy into the torsional strain energy of the structure, thereby enhancing the circumferential constraint force on the pile body 30. Furthermore, such as Figure 3 As shown, the height of the equilateral triangle containing the three legs is a. The outer end of the legs is rounded with a radius of r, and the radius of the inner arc is R. The inner arc of the legs intersects with the outer arc of the adjacent legs and transitions smoothly. The distance from the intersection point to the center of the equilateral triangle containing the three legs is b. The relationship between distance b and a is: ; Specifically, the relationship between the chamfer r at the outer end of the outrigger and the radius R of the inner curve of the arc is as follows: .
[0026] In some examples of the present invention, such as Figure 3 As shown, the ring body 13 is located at the middle of the inner cylinder 11 and the outer cylinder 12; The inner cylinder 11 has a partition 113 located at the ring 13 to separate the negative Poisson's ratio units; Specifically, the partition 113 located at the ring 13 can give the inner cylinder 11 a certain strength, especially at the connection with the ring 13, without affecting the radial expansion of the negative Poisson's ratio unit.
[0027] This type of tension pile sleeve with a negative Poisson's ratio structure is used during construction, such as... Figure 7 , Figure 10 As shown, the specific steps include: S1, Install the lower pile body 30 in the designated position; Install sleeve component 10: The lower groove formed by the ring body 13, inner cylinder 11, and outer cylinder 12 is inserted into the lower pile body 30. The through hole 112 on the inner cylinder 11 is aligned with the through hole 112 on the lower pile body 30, thus completing the connection between the sleeve component 10 and the lower pile body 30. S2, Initially, based on the inner diameter of the pile body 30, rotate the positioning ring 23 and the second support rod 26 to adjust the unfolding angle of the first horizontal bar 24 and the second horizontal bar 25 relative to the vertical bar 21, so that the distance from the unfolded end of the second horizontal bar 25 to the unfolded end of the first horizontal bar 24 is consistent with the through hole 112 of the adjacent pile bodies 30 above and below. The anchor rod 25 is suspended to the inside of the sleeve component 10 by connecting it to the anchor rod component 20 with a steel cable, so that the end of the second crossbar 25 can be aligned with the through hole 112 of the lower part of the inner cylinder 11 and the lower pile body 30. The bolt 50 then passes through the through hole 112 from the outside of the lower pile body 30 and connects to the end of the second crossbar 25, thus completing the connection between the anchor rod component 20 and the lower pile body 30. S3, fix the support plate 42 on the vertical rod 21, and fix the support plate 42 on the steel bar 41 inside the pile; The upper pile body 30 is hoisted to a suitable height so that the upper pile body 30 is inserted into the upper groove formed by the ring body 13, the inner cylinder 11, and the outer cylinder 12. The through hole 112 of the upper pile body 30 is aligned with the through hole 112 of the inner cylinder 11, thus completing the connection between the sleeve component 10 and the upper pile body 30. At this time, the end of the first horizontal bar 24 can be aligned with the through hole 112 of the lower part of the inner cylinder 11 and the upper pile body 30. The bolt 50 then passes through the through hole 112 from the outside of the upper pile body 30 and connects to the end of the first horizontal bar 24. The steel cable is then untied to complete the connection between the anchor rod component 20 and the upper pile body 30. Then, weld and seal the joint between the sleeve component 10 and the upper and lower side pile bodies 30. S4. Repeat steps S1-S3 to install the sleeve component 10 and the anchor component 20 on the upper and lower pile bodies 30. The steel bars 41 inside the pile are tightened and connected to the upper and lower adjacent bearing plates 42, and then connected to the upper end of the uppermost pile body 30. Before backfilling the soil around the pile, the pre-tensioned steel bar 41 in the pile drives the bearing plate 42 and the vertical bar 21 to produce a certain axial displacement, so that the first horizontal bar 24 and the second horizontal bar 25 extend outward to the design length to form an initial anchorage state; when the pile top is sealed, the upper end of the steel bar 41 in the pile is finally fixed.
[0028] The foregoing description, with reference to preferred embodiments, details an exemplary embodiment of an anti-uplift pile sleeve with a negative Poisson's ratio structure proposed in this invention. However, those skilled in the art will understand that various modifications and alterations can be made to the above specific embodiments without departing from the concept of this invention, and various combinations can be made to the various technical features and structures proposed in this invention, without exceeding the protection scope of this invention, which is determined by the appended claims.
Claims
1. A tension pile sleeve with a negative Poisson's ratio structure, characterized in that, Located between adjacent pile bodies (30), including: The sleeve component (10) has an inner cylinder (11) connected to the inside of the pile body (30). The inner cylinder (11) is provided with a negative Poisson's ratio unit so that the inner cylinder (11) is subjected to tension and expands radially. Both the sleeve component (10) and the pile body (30) are provided with through holes (112) that match the position. Anchor bolt component (20), located inside pile body (30), has a vertical rod (21) that moves axially in tension with pile body (30), a fixing block (211) fixed on vertical rod (21), and multiple anchor bolt units located around vertical rod (21); Each anchor unit has a crossbar assembly; one end of the crossbar assembly is rotatably connected to the fixing block (211), and the other end is tilted upward and can be limited through the through hole (112) and moved outward; When the vertical rod (21) moves upward axially, one end of the horizontal rod assembly passes through the through hole (112) and extends to the outside of the pile body (30).
2. The anti-uplift pile sleeve with a negative Poisson's ratio structure according to claim 1, characterized in that, The sleeve component (10) also has an outer cylinder (12) arranged coaxially with the inner cylinder (11) and located outside the pile body (30). The height of the outer cylinder (12) is less than the height of the inner cylinder (11), and the outer cylinder (12) is fixedly connected to the inner cylinder (11) by a ring (13); The upper and lower surfaces of the ring (13) form slots arranged vertically between the corresponding cylindrical sidewalls, and the upper and lower adjacent pile bodies (30) are inserted into the corresponding slots and fixed.
3. The anti-uplift pile sleeve with a negative Poisson's ratio structure according to claim 2, characterized in that, The crossbar assembly has a first crossbar (24); The anchor unit also includes a support slider (221), a positioning ring (23), and a first support rod (222). The support slider (221) is slidably mounted on the vertical rod (21); the positioning ring (23) is threaded on the vertical rod (21) and limits the upward movement of the support slider (221); one end of the first support rod (222) is rotatably mounted on the support slider (221), and the other end is slidably connected to the first horizontal rod (24) through the support sleeve (27).
4. The anti-uplift pile sleeve with a negative Poisson's ratio structure according to claim 3, characterized in that, The crossbar assembly also has a second crossbar (25); the anchor unit also has a second support bar (26). The fixing blocks (211) are a pair. One end of the first horizontal bar (24) is rotatably mounted on the fixing block (211) located in the middle of the vertical bar (21), and one end of the second horizontal bar (25) is rotatably mounted on the fixing block (211) located at the lower part of the vertical bar (21). The second support rod (26) is a telescopic rod, one end of which is rotatably connected to the support sleeve (27) on the first support rod (222), and the other end is slidably connected to the second crossbar (25) through the support sleeve (27); The first horizontal bar (24) passes through the upper pile body (30), and the second horizontal bar (25) passes through the lower pile body (30).
5. A pull-out pile sleeve with a negative Poisson's ratio structure according to claim 4, characterized in that, The first crossbar (24) and the second crossbar (25) are threaded at one end; The bolt (50) on the outside of the pile body (30) extends into the inside of the pile body (30) and connects with the corresponding crossbar. The diameter of the bolt head is greater than the diameter of the through hole (112) for limiting.
6. The anti-uplift pile sleeve with a negative Poisson's ratio structure according to claim 5, characterized in that, The anchor bolt component (20) also includes a support plate (42). The receiving plate (42) is fixedly installed on the upper end of the vertical rod (21); One end of the reinforcing bar (41) inside the pile is connected to the bottommost bearing plate (42), and the other end is fixedly connected to other bearing plates (42) in sequence and then connected to the top end of the pile body (30) at the top. Among them, the reinforcing bars (41) inside the pile are in a taut state.
7. A tension pile sleeve with a negative Poisson's ratio structure according to any one of claims 1 to 6, characterized in that, The negative Poisson's ratio unit has multiple negative Poisson's ratio orifices (111) arranged circumferentially spaced and axially staggered. The negative Poisson ratio pore body (111) has three legs that rotate in the same direction around the center and are of an arc structure. The outer sides of the three legs are tangent to each other and located inside an equilateral triangle. Among them, the inner ends of three adjacent legs are tangent to the circle, and the tangents at the outer ends form an equilateral triangle.
8. A pull-out pile sleeve with a negative Poisson's ratio structure according to claim 7, characterized in that, The height of the equilateral triangle containing the three legs is a. The outer corners of the legs are rounded with a radius of r, and the radius of the inner arc is R. The inner arc of the legs intersects with the outer arc of the adjacent legs and transitions smoothly. The distance from the intersection point to the center of the equilateral triangle containing the three legs is b. The relationship between distance b and a is: .
9. A tension pile sleeve with a negative Poisson's ratio structure according to any one of claims 1 to 6, characterized in that, The ring (13) is located in the middle of the inner cylinder (11) and the outer cylinder (12); the inner cylinder (11) is provided with a partition (113) at the ring (13) to separate the negative Poisson's ratio units. The pile body (30) is a square pile or a round pile.
10. A construction method for an anti-uplift pile sleeve with a negative Poisson's ratio structure according to claim 6, characterized in that, Specifically, the following steps are included: S1, Install the lower pile body (30) in the designated position; The lower slot formed by the ring body (13), inner cylinder (11), and outer cylinder (12) is inserted into the lower pile body (30). The through hole (112) on the inner cylinder (11) is aligned with the through hole (112) on the lower pile body (30), thus completing the connection between the sleeve component (10) and the lower pile body (30). S2, Initially, based on the inner diameter of the pile body (30), rotate the positioning ring (23) and the second support rod (26) to adjust the unfolding angle of the first horizontal bar (24) and the second horizontal bar (25) relative to the vertical bar (21), so that the distance from the unfolded end of the second horizontal bar (25) to the unfolded end of the first horizontal bar (24) is consistent with the through hole (112) of the adjacent pile bodies (30) above and below; The anchor rod (20) is suspended to the inside of the sleeve component (10) by connecting it with the anchor rod component (20) by steel cable, so that the end of the second crossbar (25) can be aligned with the through hole (112) of the lower part of the inner cylinder (11) and the lower pile body (30). The bolt (50) then passes through the through hole (112) from the outside of the lower pile body (30) and connects to the end of the second crossbar (25), thus completing the connection between the anchor rod component (20) and the lower pile body (30). S3, fix the receiving plate (42) on the vertical rod (21) and fix the receiving plate (42) on the steel reinforcement (41) inside the pile; The upper pile body (30) is hoisted to a suitable height so that the upper pile body (30) is inserted into the upper groove formed by the ring body (13), the inner cylinder (11), and the outer cylinder (12). The through hole (112) of the upper pile body (30) is aligned with the through hole (112) of the inner cylinder (11), thus completing the connection between the sleeve component (10) and the upper pile body (30). At this time, the end of the first horizontal bar (24) can be aligned with the through hole (112) of the lower part of the inner cylinder (11) and the upper pile body (30). The bolt (50) then passes through the through hole (112) from the outside of the upper pile body (30) and connects to the end of the first horizontal bar (24). The steel cable is then untied, and the connection between the anchor rod component (20) and the upper pile body (30) is completed. Then, weld and seal the joint between the sleeve component (10) and the upper and lower side pile bodies (30); S4. Repeat steps S1-S3 to install the sleeve component (10) and anchor component (20) on the upper and lower pile bodies (30). The steel bars (41) inside the pile are tightened and connected to the upper and lower adjacent bearing plates (42) and then connected to the upper end of the uppermost pile body (30). Before backfilling the soil around the pile, the pre-tensioned steel bar (41) in the pile drives the bearing plate (42) and the vertical bar (21) to generate a certain axial displacement, so that the first horizontal bar (24) and the second horizontal bar (25) extend outward to the design length to form an initial anchorage state; when the pile top is sealed, the upper end of the steel bar (41) in the pile is finally fixed.