A dual-material tensioning under-anchoring system and construction method

Abstract

The application discloses a double-material tensioning down-arranged anti-floating anchor rod system and a construction method, and relates to the field of anchor rod systems.The double-material tensioning down-arranged anti-floating anchor rod system comprises a foundation fixing assembly and an anchor rod assembly.The foundation fixing assembly comprises an anchor hole, a grouting body filled in the anchor hole and a grouting bottom plate filled at the top of a foundation.The anchor rod assembly comprises a pressure bearing anchor tool mechanism arranged at the lower end of the anchor hole and embedded in the grouting body, a tensioning anchor tool mechanism arranged at the upper end of the anchor hole and embedded in the bottom of the grouting bottom plate and a plurality of steel strands.The bottom of the tensioning anchor tool mechanism and the top of the grouting body are in force abutment.The tensioning anchor tool mechanism comprises an anchor tool body and a plurality of anchoring steel bars.The anchor tool body is provided with an anchoring structure for locking the steel strands.The plurality of anchoring steel bars are embedded in the grouting bottom plate.The tensioning anchor tool mechanism is arranged at the bottom of the grouting bottom plate, so that the stability of the steel strand tensioning prestress is improved.The high-strength tensile strength of the steel strands is utilized, and the anchoring steel bars and the grouting bottom plate are combined to achieve good anchoring capacity.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of geotechnical engineering and anti-floating technology of underground structure, and particularly relates to a double-material tensioned down-placed anti-floating anchor rod system and a construction method. BACKGROUND

[0002] Traditional anti-floating anchor rods generally adopt a single rod material, and are generally realized by setting a tensioning abutment in the middle of a pouring bottom plate or performing an anchor sealing operation after reserving a hole in the upper part of the pouring bottom plate. An anchorage device is directly fixed to the top end of the rod body, and the following technical defects exist: weak anchorage node: due to the thickness of the pouring bottom plate, the exposed length of the steel strand after tensioning and anchoring cannot meet the specification requirements, reducing the anchoring reliability; unreasonable stress mechanism: the traditional anchor rod bears the self-weight pressure of the upper structure under the condition of no buoyancy, the saturated tensile stress exists between the grouting body and the soil layer for a long time, the pouring bottom plate bears the additional compressive stress generated due to the tensioning of the anchor rod for a long time, the prestress of the rod body is seriously lost, and the rod body is prone to random fatigue with the change of underground water level; low construction efficiency: the steel amount of the tensioning abutment is large, and the tensioning abutment occupies space, affects the arrangement of the reinforcing bars, and increases the process complexity; insufficient waterproof sealing. SUMMARY

[0003] The present application aims to provide a double-material tensioned down-placed anti-floating anchor rod system and a construction method to solve one or more technical problems existing in the prior art, and at least provide a beneficial choice or create conditions.

[0004] The technical solutions adopted to solve the above technical problems are as follows:

[0005] According to the double-material tensioned down-placed anti-floating anchor rod system of the first aspect of the present application, the following are included:

[0006] The ground fixing assembly includes an anchor hole in the ground, a grouting body poured into the anchor hole, and a pouring bottom plate poured into the top part of the ground;

[0007] The anchor rod assembly includes a pressure bearing anchorage device mechanism arranged at the lower end of the anchor hole and buried in the grouting body, a tensioning anchorage device mechanism arranged at the upper end of the anchor hole and buried in the bottom part of the pouring bottom plate, and a plurality of steel strands connected between the pressure bearing anchorage device mechanism and the tensioning anchorage device mechanism. The bottom part of the tensioning anchorage device mechanism and the top part of the grouting body are in stress abutment. The tensioning anchorage device mechanism includes an anchorage device body and a plurality of anchoring steel bars. The anchorage device body is provided with an anchoring structure for locking the steel strands. The plurality of anchoring steel bars are connected to the top part of the anchorage device body and are buried in the pouring bottom plate.

[0008] The present application has the following beneficial effects:

[0009] In use, under the prestress of the plurality of steel strands, the grouting body is prestressed and compressed by the pressure anchorage mechanism and the tension anchorage mechanism to form the anchor pile, and the reaction force is balanced by the internal pressure stress of the grouting body during tensioning, so that the soil layer interface of the grouting body-ground is not subjected to tension, the tension anchorage mechanism is arranged at the bottom of the pouring bottom plate, the plurality of anchoring steel bars are fixedly embedded with the pouring bottom plate, the pouring bottom plate is borne on the anchorage body, and the force transmission of the upper part of the steel strand is realized, so that the stability of the steel strand tensioning prestress is improved, and the anchor rod is only subjected to the water buoyancy.

[0010] According to some embodiments of the present application, the tension anchorage mechanism further comprises an anchor backing plate in abutment with the top force of the grouting body, and the anchor backing plate is provided with a plurality of through holes for the steel strands to pass through.

[0011] According to some embodiments of the present application, the tension anchorage mechanism further comprises a waterproof sleeve ring, which is vertically arranged outside the anchorage body and located at the top side of the anchor backing plate, and the waterproof sleeve ring is filled with a waterproof buffer layer, which covers the top of the anchorage body, the upper end of the steel strand and the lower part of the anchoring steel bar.

[0012] According to some embodiments of the present application, a concrete cushion layer is arranged between the pouring bottom plate and the foundation, and a waterproof layer is embedded in the concrete cushion layer, the waterproof layer is arranged around the anchor hole, and the inner side of the waterproof layer is clamped between the lower end of the waterproof sleeve ring and the anchor backing plate.

[0013] According to some embodiments of the present application, the top of the anchorage body is uniformly provided with a plurality of connecting screw holes penetrating up and down, the lower end of the anchoring steel bar is provided with a screw head, the screw head is threadedly connected with the connecting screw hole, when the anchoring structure locks the steel strand and the steel strand is subjected to stress relaxation, the bottom end of the screw head of the anchoring steel bar is continuously rotated to pass out of the bottom of the anchorage body and abut against the anchor backing plate, the anchorage body is pulled upwards to further tension the steel strand, and the prestress loss caused by the stress relaxation of the steel strand is compensated.

[0014] According to some embodiments of the present application, the tension anchorage mechanism further comprises an upper spiral rib vertically embedded in the upper end of the grouting body, and the upper end of the upper spiral rib abuts against the bottom of the anchor backing plate.

[0015] According to some embodiments of the present application, the anchorage body is uniformly provided with a plurality of anchoring holes in the up-down direction, the anchoring holes are tapered holes with a large upper part and a small lower part, the anchoring structure comprises at least two clamping pieces, the at least two clamping pieces are annularly and spacedly formed into a tapered cylinder structure with a large upper part and a small lower part, the tapered cylinder structure is axially and slidingly sleeved in the anchoring hole, and the steel strand is locked in the tapered cylinder structure.

[0016] According to the construction method of the second aspect of the present application, the construction method is suitable for the double-material tensioned under-type anti-floating anchor rod system, and the construction method comprises the following steps:

[0017] Drilling is performed on the foundation to form the anchor hole;

[0018] The pressure-bearing anchorage mechanism is connected to the lower ends of the plurality of steel strands and is placed into the anchor hole;

[0019] The anchor hole is grouted to form the grouting body;

[0020] The plurality of steel strands are tensioned according to a preset tensioning prestress;

[0021] After the tensioning is completed, the steel strands are anchored by the tensioning anchorage mechanism, so that the bottom of the tensioning anchorage mechanism and the top of the grouting body are in stress abutment;

[0022] The top of the foundation is poured to form the pouring bottom plate, and the plurality of anchoring steel bars are embedded in the pouring bottom plate.

[0023] According to some embodiments of the present application, the construction method further comprises the following steps: after the steel strands are anchored, the anchoring steel bars are rotated, the bottom end of the screw rod head is in abutment with the anchor pad, and the steel strands are further tensioned.

[0024] According to some embodiments of the present application, the construction method further comprises the following steps: after the steel strands are tensioned and anchored, the waterproof sleeve ring is sleeved outside the anchorage body, the waterproof buffer layer is filled in the waterproof sleeve ring, and the waterproof buffer layer covers the top of the anchorage body, the upper end of the steel strand and the lower part of the anchoring steel bar.

[0025] Other features and advantages of the present application will be described in the following description, and some will become apparent from the description, or will be learned from the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0026] The present application will be further described below in combination with the drawings and embodiments;

[0027] Figure 1is a structure schematic diagram of one embodiment of the double-material tensioning under-type anti-floating anchor rod system provided by the application;

[0028] Figure 2 is Figure 1 is a partial enlarged view of part A in the figure;

[0029] Figure 3 is a step flow chart of one embodiment of the construction method provided by the application;

[0030] Reference signs:

[0031] Foundation fixing assembly 100; foundation 110; anchor hole 120; grouting body 130; concrete cushion layer 140; waterproof layer 150; pouring bottom plate 160;

[0032] Anchor rod assembly 200; pressure bearing anchor tool mechanism 210; pressure bearing plate 211; lower spiral rib 212; extrusion anchor 213; guide cap 214; tensioning anchor tool mechanism 220;

[0033] Anchor tool body 221; connecting screw hole 2211; anchoring hole 2212; anchoring steel bar 222; screw head 2221; anchoring structure 223; clamping piece 2231; anchor pad plate 224; waterproof sleeve ring 225; waterproof buffer layer 226; upper spiral rib 227; steel strand 230; positioning support 231. DETAILED DESCRIPTION

[0034] The embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary, only for explaining the present application, and cannot be understood as a limitation of the present application.

[0035] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, etc. is based on the orientation or position relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0036] In the description of the present application, multiple refers to two or more. If there is a description of first, second, only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0037] In the description of the present application, the words such as arrangement, installation, connection and the like should be understood broadly unless otherwise explicitly limited, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0038] The technical solutions of the present application will be described clearly and completely in combination with the drawings. Obviously, the following described embodiments are part of the embodiments of the present application, not all the embodiments.

[0039] The conventional anti-floating anchor rod generally adopts a single bar material, and is generally realized by setting a tensioning seat in the middle of the bottom plate or reserving a hole in the upper part of the bottom plate and then performing an anchor sealing operation, the anchor is directly fixed to the top end of the bar, and the following defects exist: insufficient waterproof sealing, weak anchorage node, unreasonable stress mechanism, concrete pouring defects and low construction efficiency, therefore, the present application provides a double-material tensioning down-type anti-floating anchor rod system and a construction method to solve the above problems.

[0040] As shown in Figure 1 and Figure 2 , the double-material tensioning down-type anti-floating anchor rod system of the present application comprises a foundation fixing assembly 100 and an anchor rod assembly 200.

[0041] The foundation fixing assembly 100 of the present application comprises an anchor hole 120 located in the foundation 110, a grouting body 130 grouted in the anchor hole 120, and a grouting bottom plate 160 grouted at the top of the foundation 110, it can be understood that the anchor hole 120 is vertically arranged, the top of the anchor hole 120 is provided with an opening, and the grouting bottom plate 160 is poured on the top of the anchor hole 120 to cover the anchor rod.

[0042] And the anchor rod assembly 200 of the present application comprises a pressure bearing anchor mechanism 210, a tensioning anchor mechanism 220 and a plurality of steel strands 230.

[0043] The pressure bearing anchor mechanism 210 is arranged at the lower end of the anchor hole 120, the lower ends of the plurality of steel strands 230 are connected with the pressure bearing anchor mechanism 210, the lower parts of the plurality of steel strands 230 are placed in the anchor hole 120 and are buried in the grouting body 130 together with the pressure bearing anchor mechanism 210, and the tensioning anchor mechanism 220 is arranged at the upper end of the anchor hole 120, the tensioning anchor mechanism 220 is anchoringly connected with the upper ends of the plurality of steel strands 230, and the bottom of the tensioning anchor mechanism 220 is in stress abutment with the top of the grouting body 130 to form an anchor pile, the tensioning anchor mechanism 220 of the present embodiment is buried in the bottom of the grouting bottom plate 160.

[0044] Among them, as shown in Figure 2As shown, the tensioning anchorage mechanism 220 of the present application comprises an anchorage body 221 and a plurality of anchoring steel bars 222, the anchorage body 221 is provided with an anchoring structure 223 for locking the steel strand 230, the plurality of anchoring steel bars 222 are connected to the top of the anchorage body 221 and extend upwardly and are embedded in the pouring base plate 160.

[0045] In use, under the prestress effect of the plurality of steel strands 230 under tension, the grouting body 130 is prestressed and compressed by the pressure-bearing anchorage mechanism 210 and the tensioning anchorage mechanism 220 to form a pile, and the reaction force is balanced by the internal pressure stress of the grouting body 130 during tensioning, thereby avoiding the interface between the grouting body 130 and the soil layer of the foundation 110 from being subjected to tension.

[0046] The steel strand 230 of the lower tensioning section of the anchor rod in the embodiment adopts a high-strength steel strand 230 with a strength of 1860 MPa, providing flexible tensile performance, and the anchoring steel bar 222 of the upper anchoring section adopts a hot-rolled ribbed steel bar such as HRB400, the anchoring steel bar 222 forms a mechanical interlocking with the concrete through the ribbing, and the anchorage transition joint: the steel strand 230 and the anchoring steel bar 222 are connected through the anchorage body 221, ensuring the continuity of the force transmission.

[0047] The present application fully utilizes the advantages of the two materials, and the two materials work together to optimize the stress distribution and perform better in complex geological and high buoyancy environments.

[0048] The present application places the tensioning anchorage mechanism 220 at the bottom of the pouring base plate 160, and the plurality of anchoring steel bars 222 are pre-embedded and fixed with the pouring base plate 160 to serve as the force support of the upper part of the steel strand 230, thereby improving the stability of the tensioning prestress of the steel strand 230, fully utilizing the advantages of the two materials, utilizing the high-strength tensile strength of the steel strand 230, combining the good anchoring ability of the anchoring steel bar 222 and the pouring base plate 160, fully utilizing the thickness of the pouring base plate 160, and exerting the self-waterproofing ability of the concrete structure of the pouring base plate 160, and the anchor rod is only subjected to the action of water buoyancy and does not need to bear the pressure from the upper load such as the pouring base plate 160, the prestress loss can be fully compensated, the tendon body is not subjected to random stress, and the stress is clear. The installation link of the pedestal is reduced, the construction period is shortened, and the labor and material costs are reduced.

[0049] The tensioning anchorage mechanism 220 of the present embodiment further comprises an anchor backing plate 224 in force abutting contact with the top of the grouting body 130, the anchor backing plate 224 is provided with a plurality of through holes for the steel strand 230 to pass through, wherein the anchor backing plate 224 is coated with epoxy resin for corrosion protection and also improves the uniformity of the force.

[0050] The tensioning anchorage mechanism 220 further comprises a waterproof sleeve ring 225 made of rubber material, wherein the waterproof sleeve ring 225 is vertically sleeved outside the anchorage body 221 and located at the top side of the anchor pad 224, the waterproof sleeve ring 225 is filled with a waterproof buffer layer 226, the waterproof buffer layer 226 covers the top of the anchorage body 221, the upper end of the steel strand 230 and the lower part of the anchoring steel bar 222, the waterproof buffer layer 226 is made of asphalt paste, the waterproof buffer layer 226 can form a closed flexible waterproof structure, the waterproof buffer layer 226 can fill the water seepage gap between each component inside the tensioning anchorage mechanism 220, tightly fit the anchor rod and the surrounding structure, so as to improve the waterproof performance, and a certain thickness of asphalt paste is arranged above the anchorage body 221 to realize dynamic waterproofing and buffer the upper structure load, the waterproof buffer layer 226 makes the anchor rod not be pressed in the non-buoyancy working condition and only activates the anti-floating function under the action of water buoyancy.

[0051] Furthermore, the waterproof buffer layer 226 of the present application simultaneously realizes sealing and waterproofing and load isolation, and solves the problems of corrosion of the traditional anchor rod and water seepage of the bottom plate.

[0052] The height of the waterproof sleeve ring 225 should be able to cover the remaining length of the steel strand 230 after tensioning and cutting, so as to ensure the closed loop of the flexible waterproof system.

[0053] The pouring bottom plate 160 of the present embodiment is provided with a concrete cushion layer 140 and a waterproof layer 150 embedded in the concrete cushion layer 140, wherein the waterproof layer 150 is arranged around the anchor hole 120, and the inner side of the waterproof layer 150 is clamped between the lower end of the waterproof sleeve ring 225 and the anchor pad 224, so as to improve the overall waterproofness of the system.

[0054] The tensioning anchorage mechanism 220 of the present embodiment further comprises an upper spiral rib 227 vertically embedded in the upper end of the grouting body 130, and the upper end of the upper spiral rib 227 abuts against the bottom of the anchor pad 224.

[0055] The pressure-bearing anchorage mechanism 210 further comprises a pressure-bearing plate 211 and a lower spiral rib 212, the pressure-bearing plate 211 is provided with an extrusion anchor 213 connected with the lower end of the steel strand 230, the lower spiral rib 212 is vertically embedded in the lower end of the grouting body 130, and the lower end of the lower spiral rib 212 abuts against the top of the pressure-bearing plate 211, so as to realize the elastic pre-pressing of the grouting body 130 under the action of the upper spiral rib 227 and the lower spiral rib 212.

[0056] The pressure-bearing plate 211 of the present embodiment is further provided with a reverse conical guide cap 214 below, so as to facilitate the extension of the pressure-bearing anchorage mechanism 210 into the anchor hole 120.

[0057] Considering that the steel strand 230 is tensioned and anchored by the anchoring structure 223, the prestress loss caused by the stress relaxation of the material itself usually reaches more than 80% within 24 hours. The anti-floating anchor also needs to cut the steel strand 230 and other processes. During the cutting process, the prestress loss caused by the disturbance of the steel strand 230 cannot be avoided, such as Figure 2 As shown in the figure, the top of the anchorage body 221 of the embodiment is uniformly distributed with a plurality of connecting screw holes 2211 which are through from top to bottom. The lower end of the anchoring steel bar 222 is provided with a screw head 2221 which is threadedly connected with the connecting screw hole 2211. The bottom end of the screw head 2221 can pass out from the bottom of the anchorage body 221 and abut against the anchor pad 224. When the anchoring steel bar 222 is continuously rotated, the anchorage body 221 can be pulled upwards to further tension the steel strand 230, compensate the prestress loss caused by the stress relaxation of the steel strand 230, and has a self-locking function.

[0058] Further, the anchorage body 221 of the embodiment is uniformly distributed with a plurality of anchoring holes 2212 which are through from top to bottom. The anchoring hole 2212 is a tapered hole which is large at the top and small at the bottom. The anchoring structure 223 includes at least two clamping pieces 2231 which are annularly spaced to form a tapered cylinder structure which is large at the top and small at the bottom. The tapered cylinder structure is slidingly sleeved in the anchoring hole 2212 in the axial direction, and the steel strand 230 is locked in the tapered cylinder structure.

[0059] In use, the steel strand 230 passes through the anchoring hole 2212. After the steel strand 230 is tensioned, the steel strand 230 is locked by the anchoring structure 223. Specifically, the clamping piece 2231 on the tapered cylinder structure can move radially. In use, the steel strand 230 passes through the tapered cylinder structure and is tensioned upwards. At this time, the steel strand 230 can move upwards relative to the anchoring hole 2212. When the tensioning is completed, the steel strand 230 is loosened. Under the action of the prestress, the steel strand 230 pulls the tapered cylinder structure to move downwards, and the clamping piece 2231 tightly holds the steel strand 230 under the guidance of the tapered surface of the anchoring hole 2212, so as to lock the steel strand 230 and lock the prestress of the steel strand 230.

[0060] A plurality of positioning supports 231 are arranged between the plurality of steel strands 230. The plurality of positioning supports 231 are sequentially and spacedly arranged in the axial direction of the anchor hole 120 to position the plurality of steel strands 230.

[0061] The double-material tensioning down-set anti-floating anchor rod system of the application realizes function integration through the sectional design of the steel strand 230 (tension) + anchoring steel bar 222 (anchoring) + asphalt oil paste (waterproofing and buffering); when there is no water buoyancy: the grouting body 130 does not bear the pressure from the upper load such as the grouting bottom plate 160, and the grouting body 130-soil interface is not subjected to tension; when there is water buoyancy: the bar body has no displacement, and the non-bonding tensioning structure is realized through the strength of the grouting body 130.

[0062] As shown in Figure 3 The application further provides a construction method applicable to the double-material tensioning down-set anti-floating anchor rod system, and the construction method comprises the following steps:

[0063] Step S100: drilling is performed on the foundation 110 to form the anchor hole 120;

[0064] Step S200: the pressure-bearing anchor mechanism 210 is connected to the lower ends of the plurality of steel strands 230 and is placed into the anchor hole 120;

[0065] Step S300: grouting is performed on the anchor hole 120 to form the grouting body 130;

[0066] Step S400: the plurality of steel strands 230 are tensioned according to the preset tensioning prestress;

[0067] Step S500: after the tensioning is completed, the steel strands 230 are anchored by the tensioning anchor mechanism 220, so that the bottom of the tensioning anchor mechanism 220 and the top of the grouting body 130 are in stress abutment;

[0068] Step S600: the top of the foundation 110 is poured to form the grouting bottom plate 160, and the plurality of anchoring steel bars 222 are embedded in the grouting bottom plate 160.

[0069] After the plurality of steel strands 230 are tensioned, the steel strands 230 need to be cut, and since the anchor body 221 is down-set at the bottom of the grouting bottom plate 160, a longer cutting length of the steel strands 230 after tensioning can be reserved within the limited thickness of the grouting bottom plate 160, more operation space is provided for various situations in actual construction, the anchoring effect is not affected by the too short length reserved at the top of the anchor body 221 after the steel strands 230 are tensioned, and the reliability of the connection between the anchor rod and the grouting bottom plate 160 is greatly enhanced.

[0070] In actual anchoring operation, such as cutting of the steel strands 230, the phenomenon of prestress loss caused by stress relaxation of the steel strands 230 is likely to occur, and the anchor steel bar 222 is rotated after the steel strands 230 are anchored, the bottom end of the screw head 2221 is in abutment with the anchor pad 224, the steel strands 230 are further tensioned, and the prestress loss caused by stress relaxation of the steel strands 230 is compensated.

[0071] After the steel strand 230 is tensioned and anchored, the waterproof collar 225 is fitted onto the outside of the anchor body 221, and the waterproof buffer layer 226 is filled into the waterproof collar 225.

[0072] When grouting anchor hole 120, grouting can be carried out through grouting pipe, and then pulled out after completion.

[0073] This invention, through its innovative bottom-mounted tensioning process, avoids the use of these additional steel materials, which not only reduces energy consumption and carbon emissions in the steel production process, aligning with the concepts of green construction and low-carbon environmental protection, but also significantly reduces resource input and lowers project costs when applied on a large scale.

[0074] In summary, the beneficial effects of this invention are as follows: Improved durability: The waterproof buffer layer 226 reduces the corrosion rate of the anchor rods and the seepage rate of the grouting base plate 160; Clear stress distribution: The anchor rods are only subjected to the buoyancy of the water, and no random stress is generated in the reinforcement; Improved concrete quality: It eliminates the air bubble retention caused by the sealing of the platform and avoids the formation of voids inside the grouting base plate 160; Optimized construction process: It reduces the platform installation steps, shortens the construction period, and reduces labor and material costs.

[0075] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0076] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A dual-material tensioned, bottom-mounted anti-buoyancy anchor system, characterized in that, include: The foundation fixing assembly includes anchor holes located in the foundation, grout injected into the anchor holes, and a grouting base plate injected onto the top of the foundation; An anchor assembly includes a pressure-bearing anchor mechanism located at the lower end of the anchor hole and embedded in the grouting body, a tension anchor mechanism located at the upper end of the anchor hole and embedded in the bottom of the grouting base plate, and multiple steel strands connected between the pressure-bearing anchor mechanism and the tension anchor mechanism. The bottom of the tension anchor mechanism is in contact with the top of the grouting body under force. The tension anchor mechanism includes an anchor body and multiple anchoring bars. The anchor body is provided with an anchoring structure for locking the steel strands. The multiple anchoring bars are connected to the top of the anchor body and embedded in the grouting base plate. The tensioning anchor mechanism also includes an anchor plate that abuts against the top of the grouting body, and the anchor plate is provided with multiple through holes for the steel strand to pass through; The tensioning anchor mechanism also includes a waterproof collar, which is vertically sleeved on the outside of the anchor body and located on the top side of the anchor plate. The waterproof collar is filled with a waterproof buffer layer, which covers the top of the anchor body, the upper end of the steel strand, and the lower part of the anchoring reinforcement. A concrete cushion layer and a waterproof layer embedded in the concrete cushion layer are provided between the grouting base plate and the foundation. The waterproof layer is arranged around the anchor hole, and the inner side of the waterproof layer is sandwiched between the lower end of the waterproof collar and the anchor plate. The top of the anchor body is evenly distributed with multiple connecting screw holes that run vertically through it. The lower end of the anchoring rebar is provided with a screw head, which is threadedly connected to the connecting screw holes. When the anchoring structure locks the steel strand and the steel strand experiences stress relaxation, the anchoring rebar continues to rotate. The bottom end of the screw head passes through the bottom of the anchor body and abuts against the anchor plate, pulling the anchor body upward to further tension the steel strand and compensate for the prestress loss caused by the stress relaxation of the steel strand.

2. The dual-material tensioned bottom-mounted anti-buoyancy anchor system according to claim 1, characterized in that: The tensioning anchor mechanism also includes an upper spiral bar vertically embedded in the upper end of the grouting body, with the upper end of the upper spiral bar abutting against the bottom of the anchor plate.

3. The dual-material tensioned bottom-mounted anti-buoyancy anchor system according to claim 1, characterized in that: The anchor body has multiple anchoring holes that are vertically connected. The anchoring holes are tapered holes that are larger at the top and smaller at the bottom. The anchoring structure includes at least two clamping plates. The at least two clamping plates are arranged in a ring to form a tapered cylindrical structure that is larger at the top and smaller at the bottom. The tapered cylindrical structure is slidably fitted into the anchoring holes along the axial direction. The steel strand is locked in the tapered cylindrical structure.

4. A construction method, characterized in that, The construction method applicable to the dual-material tensioned bottom-mounted anti-buoyancy anchor system as described in any one of claims 1 to 3 includes: Drilling is performed on the foundation to form the anchor holes; The pressure-bearing anchor mechanism is connected to the lower end of the multiple steel strands and placed into the anchor hole; Grouting is performed on the anchor holes, and the grout solidifies to form the grout body; The multiple steel strands are tensioned according to the preset tensioning prestress; After tensioning is completed, the steel strand is anchored by the tensioning anchor mechanism, so that the bottom of the tensioning anchor mechanism is in contact with the top of the grouting body. The top of the foundation is poured to form the grouting base plate, and multiple anchoring steel bars are embedded in the grouting base plate.

5. The construction method according to claim 4, characterized in that: The tensioning anchor mechanism also includes an anchor plate that abuts against the top of the grouting body. The top of the anchor body is evenly distributed with multiple connecting screw holes that run vertically through it. The lower end of the anchoring steel bar is provided with a screw head, and the screw head is threadedly connected to the connecting screw holes. The construction method also includes: After the steel strand is anchored, the anchoring bar is rotated so that the bottom end of the screw head abuts against the anchor plate, further tensioning the steel strand.

6. The construction method according to claim 4, characterized in that: The tensioning anchor mechanism further includes a waterproof collar and an anchor plate that abuts against the top of the grouting body; the construction method further includes: After the steel strand is tensioned and anchored, the waterproof collar is placed on the outside of the anchor body, and the waterproof buffer layer is filled into the waterproof collar so that the waterproof buffer layer covers the top of the anchor body, the upper end of the steel strand, and the lower part of the anchoring reinforcement.

Images