Multi-dimensional retard-bonded prestressed anti-floating pile structure and principle thereof

Abstract

The multi-dimensional retard-bonded prestressed anti-floating pile structure comprises an anti-floating pile body and a steel structure assembly in the anti-floating pile body, the steel structure assembly comprises radial spiral prestressed tendons, and the radial spiral prestressed tendons are spirally distributed in the anti-floating pile body; a plurality of radial spiral prestressed tendon positioning connectors are spirally buckled on the radial spiral prestressed tendons, a plurality of longitudinal main tendons are arranged on the circumferences of the inner sides of the radial spiral prestressed tendons at equal intervals, axial prestressed tendons are arranged in the center of the anti-floating pile body, and the spiral stirrups and the axial prestressed tendons are composed of a plurality of steel strands; a plurality of steel strands are stranded into a whole, corrugated pipes are arranged outside the steel strands in a sleeving mode, the space between the steel strands and the corrugated pipes is filled with a slow-bonding agent, the pulling resistance, the construction efficiency, the economical efficiency and the durability are comprehensively superior to those of a traditional technology through the mode of axially and radially tensioning prestressed tendons in a multi-dimensional mode and the slow-bonding technology, and excellent stress resistance is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of construction engineering, and particularly to a multi-dimensional slow-bonded prestressed anti-floating pile structure and its principle. Background Technique

[0002] In recent years, with the expansion of the scale of underground space development (such as large basements, integrated transportation hubs, etc.), the anti-floating requirements have become increasingly strict. Anti-floating piles transfer the upward buoyancy force (such as groundwater pressure, seasonal water level fluctuations, etc.) borne by the underground structure to the deep stable soil layer or bedrock through the anchoring effect between the pile body and the surrounding rock and soil, forming an "anti-floating anchor solid". The length, diameter, and rock-socketed depth of the pile body are designed according to parameters such as the buoyancy force and geological conditions to ensure that the anti-pulling bearing capacity far exceeds the sum of the self-weight of the structure and the additional load.

[0003] For underground structures, the groundwater level situation will always have a relatively obvious impact on the underground structure of buildings. Especially in the southern region, the sudden urban waterlogging caused by heavy rain year after year often leads to the continuous rise of the underground water level every year, resulting in the rise of the anti-floating design water level during actual building exploration and the occurrence of anti-floating failure accidents. Under the long-term cyclic action of water buoyancy, the frictional resistance at the pile-soil interface of conventional anti-floating piles is prone to attenuation due to soil creep, forming a three-stage catastrophe path of "elastic anti-pulling → plastic slip → sudden failure". The failure of anti-floating piles causes the basement to have an upward floating trend under the action of water buoyancy until it floats up, resulting in problems such as cracking, water seepage, and damage of the floor slab, and the structural damage and failure of some columns, beams, and walls at the same time. Therefore, in order to solve the above problems, a multi-dimensional slow-bonded prestressed anti-floating pile structure and its principle are proposed. Summary of the Invention

[0004] The purpose of the present invention is to solve the defects existing in the prior art, and to propose a multi-dimensional slow-bonded prestressed anti-floating pile structure and its principle.

[0005] In order to achieve the above purpose, the present invention adopts the following technical scheme:

[0006] A multi-dimensional slow-bonded prestressed anti-floating pile structure includes an anti-floating pile main body and a steel structure component inside it. The steel structure component includes radial spiral prestressed tendons. The radial spiral prestressed tendons are spirally distributed inside the anti-floating pile main body, and a plurality of radial spiral prestressed tendon positioning connectors are spirally buckled on the radial spiral prestressed tendons. The radial spiral prestressed tendon positioning connectors are distributed in multiple dimensions of the radial spiral prestressed tendons. A plurality of longitudinal main reinforcements are equidistantly arranged on the inner circumference of the radial spiral prestressed tendons. A spiral stirrup and a plurality of in-pile stiffeners are tied together among the plurality of longitudinal main reinforcements. An axial prestressed tendon is arranged at the center of the anti-floating pile main body. The spiral stirrup is used to form a radial spiral stress field, and the axial prestressed tendon is used to provide an axial stress field;

[0007] The spiral stirrup and the axial prestressed tendon are composed of multiple steel strands. The multiple steel strands are stranded together. A corrugated pipe is sleeved outside the steel strands. A slow-bonding agent is filled between the steel strands and the corrugated pipe. A chuck is sleeved at the end of the steel strand. An expansion ring is installed on the outside of the multiple chucks. A spiral bar sleeved outside the corrugated pipe is fixedly connected to the expansion ring. The slow-bonding agent is used to extend the structural life.

[0008] The above technical solution further includes:

[0009] The radial spiral prestressed tendon is a radially threaded arranged prestressed tendon. A radial tension end and a radial fixed end are respectively installed at both the bottom and the top of the anti-floating pile main body. The radial tension end and the radial fixed end are used to transfer prestress.

[0010] The steel strands in the radial spiral prestressed tendon are evenly distributed in the form of threads in the anti-floating pile body. The radial spiral prestressed tendon positioning connectors are alternately spirally distributed. The radial spiral prestressed tendon positioning connectors are used to enable free tensioning of the radial spiral prestressed tendon before tensioning.

[0011] Axial fixed ends and axial tension ends are respectively installed at both the bottom and the top of the anti-floating pile main body for the axial prestressed tendon. A plurality of expansion rings are installed on the outside of the axial prestressed tendon. The axial fixed end is fixed to the bottom of the anti-floating pile main body. The axial tension end extends out of the anti-floating pile main body. The axial tension end is used to connect external tensioning equipment. The spiral stirrup and the axial prestressed tendon cooperate with each other to form a multi-dimensional stress field.

[0012] The above technical solution further includes: The principle of a multi-dimensional slow-bonded prestressed anti-floating pile, including the following principles:

[0013] Based on the depth dimension of the pile hole, plan the number of segments of the steel reinforcement cage, and accordingly carry out the processing and manufacturing work of each segment of the steel reinforcement cage. The steel reinforcement cage is mainly composed of longitudinal main bars distributed in a circle. Spiral stirrups are wound outside the longitudinal main bars. Using iron wires and binding tools, at the same time, a plurality of in-pile stiffeners are tied inside a plurality of longitudinal main bars. Determine the spacing of the in-pile stiffeners according to the actual construction, so as to form the steel reinforcement cage;

[0014] First, tie the axial prestressed tendon at the center inside the vertical ordinary steel bars of the anti-floating pile main body, and place it at a position about 1 m above the bottom of the pile foundation. The axial fixed end is arranged at the bottom of the anti-floating pile main body, and the axial tension end is arranged at the top of the anti-floating pile main body;

[0015] Secondly, radially spiral prestressed tendons are arranged in a spiral shape along the radial direction of the anti-floating pile body. The radially spiral prestressed tendons are tied to the outside of the steel reinforcement cage using wire and tying tools. At the same time, the supporting special anchor fittings and the positioning connectors for the radially spiral prestressed tendons are alternately buckled onto the radially spiral prestressed tendons to ensure that the radially spiral prestressed tendons can be freely tensioned before tensioning. The radial tensioning end is located at the top, and the radial fixed end is located at the bottom;

[0016] In the later stage, reliable anchoring is formed through the curing of the slow-bonding agent material and the structural occlusion, which has the advantages of construction efficiency and long-term performance;

[0017] The radially spiral prestressed tendons are arranged in a spiral ascending manner. Its function is to form a radial stress field along the ring inside the pile body, reduce or offset the lateral frictional resistance caused by the external load. The axial prestressed tendons and the radially spiral prestressed tendons cooperate with each other to form a radial and axial composite stress field. The radial prestress enhances the frictional resistance at the pile-soil interface, and the axial prestress resists the buoyancy force. At the same time, the spiral distribution can effectively disperse the local stress concentration.

[0018] The present invention has the following beneficial effects:

[0019] 1. In the present invention, by means of axial and radial multi-dimensional tensioning of prestressed tendons and the slow-bonding technology, it comprehensively surpasses the traditional technology in terms of anti-pulling performance, construction efficiency, economy and durability, and becomes the preferred solution for anti-floating projects in complex strata.

[0020] 2. In the present invention, under the action of the multi-dimensional slow-bonding prestressed anti-floating pile structure and its principle, the new technology is applied to transform the traditional anti-floating pile into a multi-dimensional slow-bonding prestressed anti-floating pile, reducing resource consumption, reducing pollution emissions, enhancing ecological friendliness and supporting green buildings, providing an innovative solution for sustainable development in the engineering industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the internal structure of the anti-floating pile body of a multi-dimensional slow-bonding prestressed anti-floating pile structure proposed by the present invention;

[0022] Figure 2 It is a schematic diagram of the overall structure in the present invention;

[0023] Figure 3 It is a schematic diagram of the axial prestressed tendon structure of the anti-floating pile in the present invention;

[0024] Figure 4 It is a schematic diagram of the radially spiral prestressed tendon structure of the anti-floating pile in the present invention;

[0025] Figure 5 It is a schematic diagram of the fixed end or tensioning end structure of the prestressed tendon in the present invention;

[0026] Figure 6 Schematic diagram of the internal upward view structure of the anti-floating pile main body in the present invention;

[0027] Figure 7 is Figure 1 Schematic enlarged view of the structure at point A in

[0028] Figure 8 is Figure 2 Schematic enlarged view of the structure at point B in

[0029] Figure 9 is Figure 3 Schematic diagram of the axial tension end structure of the anti-floating pile in

[0030] Figure 10 is Figure 3 Schematic diagram of the axial fixed end structure of the anti-floating pile in

[0031] Figure 11 is Figure 4 Schematic diagram of the radial tension end structure of the anti-floating pile in

[0032] Figure 12 is Figure 4 Schematic diagram of the radial fixed end structure of the anti-floating pile in

[0033] Figure 13 is Figure 1 Schematic enlarged view of the structure at point G in

[0034] In the figure: 1. Anti-floating pile main body; 2. Steel strand; 3. Bellows; 4. Radial spiral prestressed tendon; 5. Expansion ring; 6. Radial spiral prestressed tendon positioning connector; 7. Stiffening bars in the pile; 8. Longitudinal main reinforcement; 9. Axial fixed end; 10. Radial fixed end; 11. Radial tension end; 12. Spiral reinforcement; 13. Chuck; 14. Spiral stirrup; 15. Axial tension end; 16. Axial prestressed tendon. Specific implementation manners

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0036] Embodiment

[0037] As Figures 1-13As shown in the figure, a multi-dimensional slow-bonded prestressed anti-floating pile structure proposed by the present invention includes an anti-floating pile main body 1 and a steel structure component inside it. The steel structure component includes a radial spiral prestressed tendon 4. The radial spiral prestressed tendon 4 is spirally distributed inside the anti-floating pile main body 1, and a plurality of radial spiral prestressed tendon positioning connectors 6 are spirally buckled on the radial spiral prestressed tendon 4. The radial spiral prestressed tendon positioning connectors 6 are distributed in multiple dimensions of the radial spiral prestressed tendon 4. A plurality of longitudinal main steel bars 8 are equidistantly arranged on the inner circumference of the radial spiral prestressed tendon 4. A spiral stirrup 14 and a plurality of in-pile stiffening bars 7 are tied together among the plurality of longitudinal main steel bars 8. An axial prestressed tendon 16 is arranged at the center of the anti-floating pile main body 1. The spiral stirrup 14 is used to form a radial spiral stress field, and the axial prestressed tendon 16 is used to provide an axial stress field;

[0038] The spiral stirrup 14 and the axial prestressed tendon 16 are composed of a plurality of steel strands 2. The plurality of steel strands 2 are stranded together. A corrugated pipe 3 is sleeved outside the steel strand 2. A slow-bonding agent is filled between the steel strand 2 and the corrugated pipe 3. A chuck 13 is sleeved at the end of the steel strand 2. An expansion ring 5 is installed on the outside of the plurality of chucks 13. A spiral bar 12 sleeved outside the corrugated pipe 3 is fixedly connected to the expansion ring 5. The slow-bonding agent is used to extend the structural life.

[0039] Furthermore, the slow-bonding agent realizes the dynamic regulation of the bonding strength through chemical or physical actions. Taking the epoxy resin-based slow-bonding agent as an example, its formula contains a base resin, a curing agent, an accelerator and a retarder. In the initial stage of construction, the retarder inhibits the curing reaction, making the material maintain fluidity, which is convenient for the threading and positioning of the prestressed tendons. As time goes by, the retarder gradually fails, and the curing agent reacts with the resin to form a high-strength three-dimensional network structure, ultimately achieving a firm bond with concrete and steel. This process can precisely control the curing speed by adjusting the type and dosage of the retarder and the ambient temperature (for example, the curing time needs to be extended below 20°C).

[0040] The pitch of the radial spiral prestressed tendon 4 is 1.5-2 times the diameter of the anti-floating pile main body 1. The radial spiral prestressed tendon 4 is a radially threaded prestressed tendon. A radial tension end 11 and a radial fixed end 10 are respectively installed at both the bottom and top ends of the anti-floating pile main body 1 for the radial spiral prestressed tendon 4. The radial tension end 11 and the radial fixed end 10 are used to transfer prestress.

[0041] The steel strands in the radial spiral prestressed tendon 4 are evenly distributed in a threaded pattern on the pile body of the anti-floating pile. The radial spiral prestressed tendon positioning connectors 6 are arranged in an alternating spiral distribution, and the radial spiral prestressed tendon positioning connectors 6 are used to enable free tensioning of the radial spiral prestressed tendon 4 before tensioning.

[0042] Axial prestressing tendons 16 are respectively installed with axial fixed ends 9 and axial tension ends 15 at both the bottom and top ends of the anti - floating pile main body 1. A plurality of expansion rings 5 are installed outside the axial prestressing tendons 16. The axial fixed end 9 is fixed to the bottom of the anti - floating pile main body 1, and the axial tension end 15 extends out of the anti - floating pile main body 1. The axial tension end 15 is used to connect to an external tensioning device. The spiral stirrups 14 and the axial prestressing tendons 16 cooperate with each other to form a multi - dimensional stress field.

[0043] In this embodiment, based on the depth dimension of the pile hole, the number of sections of the steel reinforcement cage is planned, and the processing and manufacturing of each section of the steel reinforcement cage are carried out accordingly. The steel reinforcement cage is mainly composed of longitudinal main bars 8 distributed circumferentially. Spiral stirrups 14 are wound outside the longitudinal main bars 8. Using iron wires and binding tools, a plurality of in - pile stiffeners 7 are tied inside a plurality of longitudinal main bars 8 at the same time. According to the actual construction, the spacing of the in - pile stiffeners 7 is determined, thus forming the steel reinforcement cage.

[0044] First, the axial prestressing tendons 16 are tied at the center inside the vertical ordinary steel bars of the anti - floating pile main body 1 and placed at a position about 1 m above the bottom of the pile foundation. The axial fixed end 9 is set at the bottom of the anti - floating pile main body 1, and the axial tension end 15 is set at the top of the anti - floating pile main body 1.

[0045] Secondly, the radial spiral prestressing tendons 4 are arranged in a spiral shape along the radial direction of the anti - floating pile main body 1. The radial spiral prestressing tendons 4 are tied outside the steel reinforcement cage using iron wires and binding tools. At the same time, the supporting special anchors and the radial spiral prestressing tendon positioning connectors 6 are alternately buckled on the radial spiral prestressing tendons 4 to ensure that the radial spiral prestressing tendons 4 can be freely tensioned before tensioning. The radial tension end 11 is located at the top of 1, and the radial fixed end 10 is located at the bottom of 1.

[0046] In the later stage, reliable anchoring is formed through the curing of the slow - bonding agent material and the structural bite, which has the advantages of construction efficiency and long - term performance.

[0047] The radial spiral prestressing tendons 4 are arranged in a spiral - rising manner. Its function is to form a radial stress field along the ring inside the pile body, reduce or offset the lateral frictional resistance caused by external loads. The axial prestressing tendons 16 and the radial spiral prestressing tendons 4 cooperate with each other to form a radial and axial composite stress field. The radial prestress enhances the pile - soil interface frictional resistance, and the axial prestress resists buoyancy. At the same time, the spiral distribution can effectively disperse local stress concentration.

[0048] Through the delayed - bonding characteristics of the prestressed steel strand and concrete, free tensioning during the construction stage and effective bonding in the later stage are realized, thereby improving the uplift bearing capacity and durability of the pile foundation.

[0049] The slow - bonding agent gradually cures (about 2 months to 1 year) after tensioning, forming a permanent bond with the concrete, and the full bite with the concrete further enhances the strength of the anti - floating pile.

[0050] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-dimensional slow-bonded prestressed anti-floating pile structure, comprising an anti-floating pile main body (1) and a steel structure component inside it, characterized in that, The steel structure component includes a radial spiral prestressed tendon (4), the radial spiral prestressed tendon (4) is spirally distributed inside the anti-floating pile main body (1), and a plurality of radial spiral prestressed tendon positioning connectors (6) are spirally buckled on the radial spiral prestressed tendon (4). The radial spiral prestressed tendon positioning connectors (6) are distributed in multiple dimensions of the radial spiral prestressed tendon (4). A plurality of longitudinal main reinforcements (8) are equidistantly arranged on the inner circumference of the radial spiral prestressed tendon (4). A spiral stirrup (14) and a plurality of in-pile stiffeners (7) are bundled together among the plurality of longitudinal main reinforcements (8). An axial prestressed tendon (16) is arranged at the center of the anti-floating pile main body (1). The spiral stirrup (14) is used to form a radial spiral stress field, and the axial prestressed tendon (16) is used to provide an axial stress field; The spiral stirrup (14) and the axial prestressed tendon (16) are composed of a plurality of steel strands (2). The plurality of steel strands (2) are stranded together. A corrugated pipe (3) is sleeved outside the steel strand (2). A slow-bonding agent is filled between the steel strand (2) and the corrugated pipe (3). A chuck (13) is sleeved at the end of the steel strand (2). An expansion ring (5) is installed outside the plurality of chucks (13). A spiral reinforcement (12) sleeved outside the corrugated pipe (3) is fixedly connected to the expansion ring (5). The slow-bonding agent is used to extend the structural life.

2. The multi-dimensional slow-bonded prestressed anti-floating pile structure according to claim 1, characterized in that, The radial spiral prestressed tendon (4) is a prestressed tendon arranged in a radial threaded shape. A radial tension end (11) and a radial fixed end (10) are respectively installed at both the bottom and top ends of the anti-floating pile main body (1) where the radial spiral prestressed tendon (4) is located. The radial tension end (11) and the radial fixed end (10) are used to transfer prestress.

3. A multi-dimensional slow-bonded prestressed anti-floating pile structure according to claim 1, characterized in that, The steel strands in the radial spiral prestressed tendon (4) are evenly distributed in the anti-floating pile body in a threaded pattern. The radial spiral prestressed tendon positioning connectors (6) are arranged in an alternating spiral distribution. The radial spiral prestressed tendon positioning connectors (6) are used to enable free tensioning of the radial spiral prestressed tendon (4) before tensioning.

4. A multi-dimensional slow-bonding prestressed anti-floating pile structure according to claim 1, characterized in that, The axial prestressed tendon (16) is respectively installed with an axial fixed end (9) and an axial tension end (15) at both the bottom and top ends of the anti-floating pile main body (1). A plurality of expansion rings (5) are installed outside the axial prestressed tendon (16). The axial fixed end (9) is fixed to the bottom of the anti-floating pile main body (1). The axial tension end (15) extends out of the anti-floating pile main body (1). The axial tension end (15) is used to connect external tensioning equipment. The spiral stirrup (14) and the axial prestressed tendon (16) cooperate with each other to form a multi-dimensional stress field.

5. The principle of a multi-dimensional slow-bonded prestressed anti-floating pile, characterized in that It includes the following principles: S1: Based on the depth dimension of the pile hole, plan the number of sections of the steel reinforcement cage, and accordingly carry out the processing and manufacturing work of each section of the steel reinforcement cage. The steel reinforcement cage mainly consists of longitudinally distributed longitudinal main reinforcements (8). A spiral stirrup (14) is wound outside the longitudinal main reinforcements (8). Using iron wires and binding tools, a plurality of in-pile stiffeners (7) are bundled inside the plurality of longitudinal main reinforcements (8) at the same time. According to the actual construction, determine the spacing of the in-pile stiffeners (7), thereby forming the steel reinforcement cage; S2: First, tie the axial prestressed tendon (16) at the center inside the vertical ordinary steel bars of the anti-floating pile main body (1), and place it at a position about 1 m above the bottom of the pile foundation. The axial fixed end (9) is set at the bottom of the anti-floating pile main body (1), and the axial tension end (15) is set at the top of the anti-floating pile main body (1); S3: Secondly, arrange the radial spiral prestressed tendons (4) in a spiral shape along the radial direction of the anti-floating pile main body (1). Use iron wires and binding tools to tie the radial spiral prestressed tendons (4) outside the steel reinforcement cage. At the same time, alternately buckle the supporting special anchor fittings and the radial spiral prestressed tendon positioning connectors (6) on the radial spiral prestressed tendons (4) to ensure that the radial spiral prestressed tendons (4) can be freely tensioned before tensioning. The radial tension end (11) is located at the top of 1, and the radial fixed end (10) is located at the bottom of 1; S4: In the later stage, reliable anchoring is formed through the curing of the slow-bonding agent material and the structural occlusion, with both construction efficiency and long-term performance advantages; S5: The radial spiral prestressed tendon (4) is arranged in a spiral ascending manner. Its function is to form a radial stress field along the ring inside the pile body, reduce or offset the lateral frictional resistance caused by the external load. The axial prestressed tendon (16) and the radial spiral prestressed tendon (4) cooperate with each other to form a radial and axial composite stress field. The radial prestress enhances the pile-soil interface frictional resistance, and the axial prestress resists buoyancy. At the same time, the spiral distribution can effectively disperse the local stress concentration.

Images