Basement anti-floating anchor rod structure and construction method

Abstract

The basement anti-floating anchor rod structure and construction method belong to the technical field of building construction, and the structure comprises threaded rods, positioning pieces, limiting pieces, water stop pieces and grouting pipes. The threaded rods are arranged in parallel and at least three, and the threaded rods comprise straight sections and outwardly curved bent sections. The positioning pieces are arranged equidistantly along the height direction of the straight sections. The limiting pieces are arranged at the bottom of the straight sections. The water stop pieces are installed between the straight sections and the bent sections. The grouting pipes are arranged at the center of the multiple threaded rods. The positioning pieces comprise positioning plates and elastic sheets. The limiting pieces comprise fixed plates, limiting rods, movable rings, guide rods and weights. The structure increases the friction between the anchor rod and the hole wall through the limiting pieces, and realizes the expansion limiting of the bottom end of the anchor rod by controlling the rotation of the limiting rod, thereby solving the problem of the upward floating of the anchor rod, facilitating operation and construction, and being reliable in anti-floating effect.

Description

Technical Field

[0001] This invention belongs to the field of building construction technology, and specifically relates to a basement anti-buoyancy anchor structure and construction method. Background Technology

[0002] With the rapid development of my country's economy, the urbanization rate is constantly increasing, and the urban population is rising. Given the limited available land resources, people are paying more and more attention to the development and utilization of underground space. Urban buildings are also developing in two extreme directions: taller buildings and deeper underground structures. Making full use of underground space has become an inevitable trend. However, in areas with high groundwater levels, anti-buoyancy anchors are commonly used to prevent building structures from floating due to groundwater buoyancy. Traditional anti-buoyancy anchors, during grouting construction, suffer from insufficient lateral friction resistance due to the gap between the anchor and the surrounding rock borehole wall, easily causing the anchor to float with the grouting. This floating becomes more pronounced with increasing anchor length, significantly affecting the quality of anchor support. Furthermore, limited by pull-out bearing capacity, traditional anti-buoyancy anchors are often arranged in a distributed manner, which has disadvantages such as difficulty in ensuring construction quality, low construction efficiency, and a poor construction environment. Moreover, waterproofing at joints is difficult to handle, easily leading to leakage risks. Summary of the Invention

[0003] This invention provides a basement anti-buoyancy anchor structure and construction method. By increasing the friction between the anchor and the hole wall through a limiting component, and controlling the rotation of the limiting rod to expand and limit the bottom end of the anchor, the problem of anchor floating is solved. This method is convenient for operation and construction, and the anti-buoyancy effect is reliable.

[0004] In view of the above problems, the technical solution proposed by the present invention is as follows:

[0005] This invention provides a basement anti-buoyancy anchor structure, including threaded rods, positioning components, limiting components, water-stopping components, and grouting pipes. At least three threaded rods are arranged side by side. Each threaded rod includes a straight section and an outwardly bent section. The positioning components are equidistantly arranged along the height direction of the straight section. The limiting components are located at the bottom of the straight section. The water-stopping components are installed between the straight section and the bent section. The grouting pipe is located at the center of the multiple threaded rods.

[0006] The positioning component includes a positioning plate and an elastic sheet. Two positioning plates are provided. The positioning plates pass through the outside of the threaded rod. The elastic sheet is disposed between the two positioning plates. The outer side of the elastic sheet abuts against the inner wall of the anchor hole.

[0007] The limiting component includes a fixed plate, limiting rods, a movable ring, a guide rod, and a counterweight. The bottom end of the threaded rod is welded and fixed to the top of the fixed plate. Three limiting rods are provided and arranged in a ring array on the outside of the fixed plate. One end of each limiting rod is rotatably connected to the fixed plate. The movable ring is sleeved on the outside of the three limiting rods. The outer diameter of the movable ring is smaller than the inner diameter of the anchor hole. The guide rods are arranged in a ring array at the bottom of the movable ring. The counterweight is located below the fixed plate.

[0008] As a preferred embodiment of the present invention, the positioning plate is welded and fixed to the outer wall of the threaded rod on both sides, and at least three slots are opened in an annular array on the outer periphery of the positioning plate. The number of elastic pieces is equal to the number of slots, and the two ends of the elastic pieces are rotatably connected to the inner wall of the slots on the two positioning plates respectively.

[0009] As a preferred embodiment of the present invention, a fixing post is provided at the top center of the fixing plate. The fixing post has a triangular structure. Three movable slots are arranged in a ring around the outer periphery of the fixing plate. The movable slots are staggered with the threaded rod. One end of the limiting rod is rotatably connected to the inside of the movable slot. When the limiting rod is unfolded, its bottom abuts against the bottom wall of the movable slot.

[0010] As a preferred embodiment of the present invention, three first spring members are provided on the outer side of the fixing column. One side of the first spring member is welded and fixed to the side of the fixing column, and the other end of the first spring member abuts against the side of the limiting rod when the limiting rod is retracted.

[0011] As a preferred embodiment of the present invention, a fixing ring is provided on the bottom outer side of the fixing plate. The fixing ring is integrally formed with the fixing plate. The end of the guide rod away from the movable ring passes through the fixing ring and bends inward, and is fixedly connected to the top of the counterweight.

[0012] As a preferred embodiment of the present invention, a second spring is sleeved on the outer side of the guide rod, and the two ends of the second spring abut against the bottom of the movable ring and the top of the fixed ring, respectively.

[0013] As a preferred embodiment of the present invention, the water-stopping component includes a water-stopping sheet and a shaped reinforcing bar. The shaped reinforcing bar passes through the center of the water-stopping sheet and is welded and fixed to both sides of the water-stopping sheet. Both ends of the shaped reinforcing bar are threadedly connected to threaded sleeves, and the other ends of the two threaded sleeves are respectively threadedly connected to the top end of the straight section and the bottom end of the bent section.

[0014] On the other hand, a construction method for an anti-buoyancy anchor in a basement includes the following steps:

[0015] S1, Anchor hole positioning: According to the construction design drawings, the anchor hole positions are marked out and the surrounding soil is leveled. Then, temporary sleeves are installed at the corresponding positions of the anchor holes.

[0016] S2, Soil treatment: Lay the cushion layer, waterproof layer and base plate on the soil surface in sequence as required, with the top of the temporary sleeve extending to the top surface of the base plate.

[0017] S3, Anchor hole construction: Drill a hole into the soil layer from the center of the temporary casing until the anchor hole penetrates 2-3m into the rock layer, and then construct the enlarged hole and clean the hole at the bottom of the anchor hole.

[0018] S4, Anchor rod fabrication: Based on the anchor hole depth, process the straight and bent sections of the threaded rod. Insert positioning parts at equal intervals into the straight section and weld the positioning plate to the straight section. Then, install the limiting part at the bottom of the straight section and weld the fixing plate to the end of the straight section. Move the limiting rod sequentially to vertical and abut against the first spring part. Then, move the movable ring upward to fit it onto the outside of the limiting rod. Then, install the water-stopping part. Screw the top of the straight section and the bottom of the bent section into the threaded sleeves on both sides of the water-stopping piece. Then, lay the grouting pipe in the center of the threaded rod so that the bottom of the grouting pipe is above the limiting part.

[0019] S5, Anchor Bolt Lifting: The completed anchor bolt is lifted into the anchor hole using lifting machinery. During the lowering process, multiple elastic plates on the outside of the positioning component always slide in contact with the inner wall of the anchor hole to keep the anchor bolt aligned. When the limiting component enters the enlarged hole, the counterweight abuts against the bottom of the anchor hole and pushes the movable ring upward through the guide rod, causing the movable ring to disengage from the limiting rod. Under the action of the first spring component, the limiting rod rotates outward and opens and gets into the enlarged hole.

[0020] S6, Grouting: A grouting machine is connected to the top of the grouting pipe to inject concrete grout into the anchor hole, and the bent section of the threaded rod that protrudes to the surface of the base plate is protected.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] (1) The structure binds the threaded rod into a bundle by setting the limiting plates at intervals. The elastic plates between the limiting plates expand outward and stick tightly to the inner wall of the anchor hole, increasing the friction between the anchor rod and the anchor hole, effectively preventing the anchor rod from floating and displacing. At the same time, the bent elastic plates increase the biting force between the anchor rod and the grout, improving the strength of the anti-buoyancy anchor rod.

[0023] (2) This structure adds a limiting component to the bottom of the traditional anchor rod. The hinged limiting rod automatically flips outward and opens and is embedded in the expanded section at the bottom of the anchor hole. The limiting rod and the expanded step make the anchor rod hook and limit it to the anchor hole, thereby enhancing the anti-buoyancy performance of the anchor rod. The effect is obvious and reliable, saves process steps, and is easy to operate and construct.

[0024] (3) This structure divides the traditional anchor rod into a straight section and a bent section, and connects them with an integrated water-stop component. It is easy to install, efficient, and has a good water-stopping effect, effectively preventing leakage risks and ensuring construction quality.

[0025] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of a basement anti-buoyancy anchor structure disclosed in this invention;

[0027] Figure 2 This is a schematic diagram of the positioning component disclosed in this invention;

[0028] Figure 3 This is a schematic diagram of the structure of the limiting member disclosed in this invention;

[0029] Figure 4 This is a structural schematic diagram of the limiting member in use as disclosed in this invention;

[0030] Figure 5 This is a schematic diagram of the structure of the water-stopping component disclosed in this invention;

[0031] Figure 6 This is a schematic flowchart of a construction method for an anti-buoyancy anchor rod in a basement disclosed in this invention;

[0032] Figure 7 This is a cross-sectional schematic diagram of the anchor bolt hoisting steps disclosed in this invention;

[0033] Figure 8 This is a cross-sectional schematic diagram of the hole-forming and grouting steps disclosed in this invention;

[0034] Explanation of reference numerals in the attached drawings: 10, soil layer; 11, anchor hole; 12, enlarged hole; 20, cushion layer; 30, waterproof layer; 40, base plate; 50, temporary sleeve; 101, threaded rod; 1011, straight section; 1012, bent section; 102, positioning component; 1021, positioning plate; 1022, groove; 1023, elastic sheet; 103, limiting component; 1031, fixing plate; 10311, fixing column; 10312, first spring component; 1032, movable groove; 1033, limiting rod; 1034, fixing ring; 1035, movable ring; 1036, guide rod; 10361, second spring component; 1037, counterweight; 104, waterstop component; 1041, waterstop plate; 1042, formed steel bar; 1043, threaded sleeve; 105, grouting pipe. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments 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. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0037] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0038] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0040] Example 1

[0041] See attached document Figure 1-5As shown, the present invention provides a technical solution: a basement anti-buoyancy anchor structure, including threaded rods 101, positioning components 102, limiting components 103, water-stopping components 104, and grouting pipes 105. At least three threaded rods 101 are arranged side-by-side. Each threaded rod 101 includes a straight section 1011 and an outwardly bent section 1012. The straight section 1011 extends into the anchor hole 11 and solidifies with the grouting material. The bent section 1012 protrudes to the surface of the soil layer 10 and is placed inside the post-cast valve plate, firmly connecting the basement valve plate to the anchor rod to prevent the building structure from floating due to groundwater level. The positioning components 102 are equidistantly arranged along the height direction of the straight section 1011. The positioning components 102 inwardly connect the three threaded rods... The rods 101 are positioned in a bundle, and the anchor rods are pushed outward to fit tightly against the inner wall of the pore, thereby keeping the center of the anchor rods aligned with the anchor holes 11. The limiting member 103 is set at the bottom of the straight section 1011. The limiting member 103 is used to limit the vertical direction of the anchor rods and prevent them from floating. The water-stopping member 104 is installed between the straight section 1011 and the bent section 1012. The water-stopping member 104 connects the straight section 1011 and the bent section 1012 while preventing groundwater from entering the valve plate upward along the threaded rods 101, effectively reducing the risk of leakage. The grouting pipe 105 is set at the center of multiple threaded rods 101. The grouting pipe 105 is vertically inserted between the threaded rods 101 to facilitate concrete pouring after the anchor rods are positioned.

[0042] The positioning component 102 includes a positioning plate 1021 and an elastic sheet 1023. Two positioning plates 1021 are provided. The positioning plates 1021 are inserted through the outer side of the threaded rod 101. The positioning sheets are arranged at equal intervals to position the distance between the three threaded rods 101 and maintain the perpendicularity of the straight section 1011. The elastic sheet 1023 is arranged between the two positioning plates 1021. The outer side of the elastic sheet 1023 abuts against the inner wall of the anchor hole 11. The elastic sheet 1023 is made of inner metal spring sheet and outer rubber material. It relies on its own elastic force to maintain a tight fit with the inner wall of the anchor hole 11, thereby ensuring that the center of the threaded rod 101 is aligned with the center of the anchor hole 11 and preventing the anchor rod axis from tilting or deviating and affecting the molding quality.

[0043] The limiting component 103 includes a fixed plate 1031, limiting rods 1033, a movable ring 1035, a guide rod 1036, and a counterweight 1037. The bottom end of the threaded rod 101 is welded and fixed to the top of the fixed plate 1031. Three limiting rods 1033 are provided and arranged in a circular array on the outside of the fixed plate 1031. One end of the limiting rod 1033 is rotatably connected to the fixed plate 1031. The movable ring 1035 is sleeved on the outside of the three limiting rods 1033. The limiting rods 1033 retract under the action of the movable ring 1035. When the movable ring 1035 disengages from the limiting rods 1033, the limiting rods 1033 retract. Under external force, it flips outward and expands, increasing the radial diameter of the bottom of the anchor rod. It is embedded in the enlarged hole 12 at the bottom of the pore to achieve the upward limit of the anchor rod. The outer diameter of the movable ring 1035 is smaller than the inner diameter of the anchor hole 11, so that the limiting member 103 does not affect the hoisting and lowering of the anchor rod. The guide rod 1036 is arranged in a ring array at the bottom of the movable ring 1035. The counterweight 1037 is set below the fixed plate 1031. The bottom of the counterweight 1037 has a conical structure, which facilitates the hoisting and lowering of the anchor rod. At the same time, the conical tip reduces the collision and impact between the mud and sand in the anchor hole 11 and the limiting member 103 during hoisting and lowering, thus playing a certain protective role.

[0044] The embodiments of the present invention are also implemented through the following technical solutions.

[0045] In an embodiment of the present invention, the positioning plate 1021 is welded and fixed to the outer wall of the threaded rod 101 on both sides. The positioning plate 1021 is fitted onto the threaded rod 101 for measurement and positioning. The weld bevel is formed to ensure the connection strength. The outer periphery of the positioning plate 1021 has at least three slots 1022 in an annular array. The number of elastic pieces 1023 is equal to the number of slots 1022. The two ends of the elastic pieces 1023 are rotatably connected to the inner walls of the slots 1022 on the two positioning plates 1021 respectively. The hinge structure between the two ends of the elastic pieces 1023 and the positioning plate 1021 is used to limit the size of the arc in the middle of the elastic pieces 1023. The multiple elastic pieces 1023 are of equal length, thereby forming a resisting force in all directions to keep the anchor rod in the center state.

[0046] In an embodiment of the present invention, a fixing post 10311 is provided at the top center of the fixing plate 1031. The fixing post 10311 has a triangular structure. Three movable slots 1032 are arranged in a ring around the outer periphery of the fixing plate 1031. The movable slots 1032 are staggered with the threaded rod 101. One end of the limiting rod 1033 is rotatably connected to the inside of the movable slot 1032. The limiting rod 1033 is connected to the movable slot 1032 by a pin. The movable slot 1032 provides space for the rotation of the limiting rod 1033, thereby realizing the free rotation of the limiting rod 1033. When the limiting rod 1033 is unfolded, its bottom abuts against the bottom wall of the movable slot 1032. 1032 supports and limits the extended movable rod, ensuring the maximum extension angle of the limiting rod 1033, thereby increasing the anti-buoyancy limiting force of the limiting rod 1033 on the anchor rod. Three first spring members 10312 are provided on the outside of the fixed column 10311. One side of the first spring member 10312 is welded and fixed to the side of the fixed column 10311. The other end of the first spring member 10312 abuts against the side of the limiting rod 1033 when the limiting rod 1033 is retracted. The first spring member 10312 is a compression spring, and its elastic force acts on the side of the limiting rod 1033, so that the limiting rod 1033 can be freely extended without external force. The structure is simple and practical.

[0047] In an embodiment of the present invention, a fixing ring 1034 is provided on the outer bottom of the fixing plate 1031. The fixing ring 1034 is integrally formed with the fixing plate 1031. The end of the guide rod 1036 away from the movable ring 1035 passes through the fixing ring 1034 and bends inward, and is fixedly connected to the top of the counterweight 1037. The fixing ring 1034 provides a limiting guide for the guide rod 1036, ensuring the vertical movement of the guide rod 1036. The end of the guide rod 1036 is bent inward to form a cone shape, which is adapted to the structure of the counterweight 1037, facilitating hoisting and reducing the impact of mud and sand. A second spring member 10361 is sleeved on the outer side of the guide rod 1036. The two ends of the second spring member 10361 abut against the bottom of the movable ring 1035 and the top of the fixing ring 1034, respectively. The two ends of the second spring member 10361 are free ends, and their elasticity is... The force is less than the weight of the hammer 1037. Therefore, when the anchor rod is hoisted and lowered, the hammer 1037 drives the movable ring 1035 to compress the second spring 10361 through the guide rod 1036, thereby preventing the movable ring 1035 from moving and keeping the movable ring 1035 in a position that limits the limit rod 1033. When the anchor rod is lowered to the bottom of the anchor hole 11, the position of the limit member 103 corresponds to the position of the enlarged hole 12, and the hammer 1037 contacts the bottom of the anchor hole 11. As the anchor rod continues to be lowered, the hammer 1037 pushes the movable ring 1035 upward through the guide rod 1036. At the same time, the rebound force of the second spring 10361 acts on the movable ring 1035, causing the movable ring 1035 to break free from the restriction of the limit rod 1033. Under the action of the first spring 10312, the limit rod 1033 unfolds outward and embeds into the enlarged hole 12 to achieve the anchor rod anti-buoyancy limit.

[0048] In an embodiment of the present invention, the water-stopping component 104 includes a water-stopping sheet 1041 and a formed reinforcing bar 1042. The formed reinforcing bar 1042 passes through the center of the water-stopping sheet 1041 and is welded and fixed to both sides of the water-stopping sheet 1041. The weld bevel between the water-stopping sheet 1041 and the formed reinforcing bar 1042 is formed to ensure the strength of the water-stopping component 104 and to prevent leakage. Both ends of the formed reinforcing bar 1042 are threadedly connected to threaded sleeves 1043. The other ends of the two threaded sleeves 1043 are respectively threadedly connected to the top end of the straight section 1011 and the bottom end of the bent section 1012. The two ends of the formed reinforcing bar 1042 are threaded and connected by threaded sleeves 1043. The operation is simple and convenient, and the connection firmness can be judged by observing the length of the exposed threads of the formed reinforcing bar 1042, which facilitates construction management and ensures the water-stopping effect.

[0049] Example 2

[0050] See attached document Figure 6-8 As shown in the figure, another construction method for an anti-buoyancy anchor rod in a basement provided by an embodiment of the present invention includes the following steps:

[0051] S1, Anchor hole positioning: According to the construction design drawing, the anchor hole 11 is positioned and the surrounding soil layer 10 is leveled. Then, a temporary sleeve 50 is installed at the corresponding position of the anchor hole 11.

[0052] S2, Soil treatment: Lay the cushion layer 20, waterproof layer 30 and base plate 40 on the surface of soil layer 10 in sequence as required. The top of the temporary sleeve 50 extends to the top surface of the base plate 40.

[0053] S3, Anchor hole construction: Drill a hole into the soil layer 10 from the center of the temporary casing 50 until the anchor hole 11 penetrates into the rock layer 2-3m. Then, construct the enlarged hole 12 at the bottom of the anchor hole 11 and clean the hole.

[0054] S4, Anchor rod fabrication: According to the depth of the anchor hole 11, the straight section 1011 and the bent section 1012 of the threaded rod 101 are machined. Positioning parts 102 are inserted at equal intervals on the straight section 1011, and the positioning plate 1021 is welded and fixed to the straight section 1011. Then, the limiting part 103 is installed at the bottom of the straight section 1011, and the fixing plate 1031 is welded to the end of the straight section 1011. The limiting rod 1033 is moved to vertical and abuts against the first spring part 10312. Then, the movable ring 1035 is moved upward so that it is sleeved on the outside of the limiting rod 1033. Then, the water-stopping part 104 is installed. The top of the straight section 1011 and the bottom of the bent section 1012 are screwed into the threaded sleeves 1043 on both sides of the water-stopping piece 1041, respectively. Then, the grouting pipe 105 is arranged in the center of the threaded rod 101, so that the bottom of the grouting pipe 105 is above the limiting part 103.

[0055] S5, Anchor bolt hoisting: The completed anchor bolt is hoisted into the anchor hole 11 using hoisting machinery. During the lowering process, the multiple elastic plates 1023 on the outside of the positioning member 102 always slide in contact with the inner wall of the anchor hole 11 to keep the anchor bolt aligned. When the limiting member 103 enters the enlarged hole 12, the counterweight 1037 abuts against the bottom of the anchor hole 11 and pushes the movable ring 1035 upward through the guide rod 1036, so that the movable ring 1035 is released from the restriction of the limiting rod 1033. Under the action of the first spring member 10312, the limiting rod 1033 rotates outward and opens and gets stuck in the enlarged hole 12.

[0056] S6, Grouting: A grouting machine is connected to the top of the grouting pipe 105 to inject concrete grout into the anchor hole 11, and the bent section of the threaded rod 101 that protrudes to the surface of the base plate 40 is protected.

[0057] The construction method provided in this embodiment of the invention first performs surface treatment on the soil layer 10, allowing the anchor rod fabrication and anchor hole 11 construction to proceed simultaneously, shortening the construction period and improving the construction environment. The positioning component 102 is used to keep the anchor rod aligned with the central axis of the anchor hole 11, preventing the anchor rod from shifting. The limiting component 103 is embedded and hooked to the bottom of the anchor hole 11, improving the forming strength of the anchor rod, anchor hole 11, and concrete grout, ensuring the anchor rod's anti-buoyancy effect. Finally, a pre-made water-stop component 104 is connected to the top of the threaded rod 101 to improve the anchor rod's water-stopping ability and prevent groundwater leakage. The process is simple, efficient, reliable, and easy to promote and apply.

[0058] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A basement anti-buoyancy anchor structure, characterized in that, The device includes threaded rods (101), positioning elements (102), limiting elements (103), water-stopping elements (104), and grouting pipes (105). At least three threaded rods (101) are arranged side by side. Each threaded rod (101) includes a straight section (1011) and an outwardly bent section (1012). The positioning elements (102) are equidistantly arranged along the height direction of the straight section (1011). The limiting elements (103) are located at the bottom of the straight section (1011). The water-stopping elements (104) are installed between the straight section (1011) and the bent section (1012). The grouting pipes (105) are located at the center of the multiple threaded rods (101). The positioning component (102) includes a positioning plate (1021) and an elastic sheet (1023). Two positioning plates (1021) are provided. The positioning plates (1021) are inserted through the outer side of the threaded rod (101). The elastic sheet (1023) is disposed between the two positioning plates (1021). The outer side of the elastic sheet (1023) abuts against the inner wall of the anchor hole (11). The limiting component (103) includes a fixed plate (1031), limiting rods (1033), a movable ring (1035), a guide rod (1036), and a counterweight (1037). The bottom end of the threaded rod (101) is welded and fixed to the top of the fixed plate (1031). There are three limiting rods (1033), which are arranged in a ring array on the outside of the fixed plate (1031). One end of the limiting rod (1033) is rotatably connected to the fixed plate (1031). The movable ring (1035) is sleeved on the outside of the three limiting rods (1033). The outer diameter of the movable ring (1035) is smaller than the inner diameter of the anchor hole (11). The guide rods (1036) are arranged in a ring array at the bottom of the movable ring (1035). The counterweight (1037) is located below the fixed plate (1031). A fixing post (10311) is provided at the top center of the fixing plate (1031). The fixing post (10311) has a triangular structure. Three movable slots (1032) are arranged in a ring around the outer periphery of the fixing plate (1031). The movable slots (1032) are staggered with the threaded rod (101). One end of the limiting rod (1033) is rotatably connected to the inside of the movable slot (1032). When the limiting rod (1033) is unfolded, its bottom abuts against the bottom wall of the movable slot (1032). Three first spring members (10312) are provided on the outside of the fixed column (10311). One side of the first spring member (10312) is welded and fixed to the side of the fixed column (10311), and the other end of the first spring member (10312) abuts against the side of the limiting rod (1033) when the limiting rod (1033) is retracted. A fixing ring (1034) is provided on the bottom outer side of the fixing plate (1031). The fixing ring (1034) is integrally formed with the fixing plate (1031). The end of the guide rod (1036) away from the movable ring (1035) passes through the fixing ring (1034) and bends inward, and is fixedly connected to the top of the counterweight (1037). A second spring (10361) is sleeved on the outside of the guide rod (1036), and the two ends of the second spring (10361) abut against the bottom of the movable ring (1035) and the top of the fixed ring (1034), respectively.

2. The anti-buoyancy anchor structure for a basement according to claim 1, characterized in that, The positioning plate (1021) is welded and fixed to the outer wall of the threaded rod (101) on both sides. The outer periphery of the positioning plate (1021) is provided with at least three slots (1022) in an annular array. The number of elastic pieces (1023) is equal to the number of slots (1022). The two ends of the elastic pieces (1023) are rotatably connected to the inner walls of the slots (1022) on the two positioning plates (1021).

3. The anti-buoyancy anchor structure for a basement according to claim 1, characterized in that, The water-stopping component (104) includes a water-stopping plate (1041) and a shaped steel bar (1042). The shaped steel bar (1042) passes through the center of the water-stopping plate (1041) and is welded and fixed to both sides of the water-stopping plate (1041). Both ends of the shaped steel bar (1042) are threadedly connected to threaded sleeves (1043). The other ends of the two threaded sleeves (1043) are respectively threadedly connected to the top end of the straight section (1011) and the bottom end of the bent section (1012).

4. A construction method for a basement anti-buoyancy anchor, applied to the basement anti-buoyancy anchor structure described in claim 3, characterized in that, Includes the following steps: S1, Anchor hole positioning: According to the construction design drawing, the anchor hole (11) position is marked and the surrounding soil layer (10) is leveled. Then, a temporary sleeve (50) is installed at the corresponding position of the anchor hole (11). S2, Soil treatment, lay the cushion layer (20), waterproof layer (30) and base plate (40) in sequence on the surface of the soil layer (10) as required, and the top of the temporary sleeve (50) extends to the top surface of the base plate (40); S3, Anchor hole construction: Drill a hole into the soil layer (10) from the center of the temporary casing (50) until the anchor hole (11) penetrates into the rock layer 2-3m. Then, construct an enlarged hole (12) at the bottom of the anchor hole (11) and clean the hole. S4, Anchor rod fabrication: Based on the depth of the anchor hole (11), machine the straight section (1011) and bent section (1012) of the threaded rod (101). Insert positioning parts (102) at equal intervals into the straight section (1011), and weld the positioning plate (1021) to the straight section (1011). Then, install a limiting part (103) at the bottom of the straight section (1011), weld the fixing plate (1031) to the end of the straight section (1011), and move the limiting rod (1033) sequentially to... Vertically and abutting against the first spring member (10312), then push the movable ring (1035) upward to fit it onto the outside of the limiting rod (1033), then install the water-stop member (104), screw the top of the straight section (1011) and the bottom of the bent section (1012) into the threaded sleeves (1043) on both sides of the water-stop plate (1041), then arrange the grouting pipe (105) in the center of the threaded rod (101), so that the bottom end of the grouting pipe (105) is above the limiting member (103); S5, Anchor rod hoisting: The completed anchor rod is hoisted into the anchor hole (11) using hoisting machinery. During the lowering process, multiple elastic plates (1023) on the outside of the positioning member (102) are always in sliding contact with the inner wall of the anchor hole (11) to keep the anchor rod aligned. When the limiting member (103) enters the enlarged hole (12), the hammer (1037) abuts against the bottom of the anchor hole (11) and pushes the movable ring (1035) upward through the guide rod (1036) so that the movable ring (1035) is released from the restriction of the limiting rod (1033). Under the action of the first spring member (10312), the limiting rod (1033) rotates outward and opens and is inserted into the enlarged hole (12). S6, Grouting: Connect a grouting machine to the top of the grouting pipe (105) to inject concrete grout into the anchor hole (11), and protect the bent section of the threaded rod (101) that protrudes to the surface of the bottom plate (40).

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