Anchor rod structure, anchor rod construction method, and anchor rod body formed by the construction method

Abstract

The application discloses an anchor rod structure, a construction method of the anchor rod and an anchor rod body formed by the construction method. The anchor rod structure comprises a bus base material, a tension structure and a fixing structure. The fixing structure is located at the lower end of the bus base material and is used for anchoring the lower part of the anchor rod structure. The tension structure is located at the upper end of the bus base material and is used for tensioning and locking the bus base material. The outside of the bus base material is provided with an isolation structure. The inside of the isolation structure and the outside of the bus base material form a first annular structure. The anchor rod structure further comprises a side grouting pipe. The side grouting pipe extends from the top of the anchor rod structure to the bottom. The bottom of the side grouting pipe is communicated with the bottom of the first annular structure. The internal space defined by the first annular structure and the side grouting pipe is isolated from the outside of the isolation structure and the side grouting pipe, and forms a secondary grouting and back discharge channel. Therefore, the problem of water seepage of the anchor rod in the later period can be solved, and the difficulty of water stopping in the later period and the engineering cost can be solved.

Description

Technical Field

[0001] This invention relates to the field of building construction, and in particular to an anchor structure, an anchor construction method, and an anchor body formed by the construction method. Background Technology

[0002] Traditional anti-buoyancy anchors are mainly composed of two types: compression type and tension type. The base material of the busbar is mainly made of ordinary threaded steel bars or precision-rolled threaded steel bars, and steel strands can also be used. Because the initial standards for anti-buoyancy anchors required the use of ordinary threaded steel bars as the base material, the corresponding defects have gradually become apparent. For example, low anchorage pull-out resistance, poor disturbance resistance stability, and weak corrosion and seepage resistance have led to safety accidents such as shear fracture, misalignment, cracking, and leakage of building foundation load-bearing beams.

[0003] Although anchor manufacturers have made iterative innovations in the design and development of finished anchors regarding pull-out anchoring force, corrosion resistance, and seepage prevention, the problem of underground foundation water leakage at the upper anchoring end of prestressed anti-buoyancy anchors has not been effectively solved due to factors such as the requirements of the base material of the prestressed anti-buoyancy anchor (fine-rolled threaded steel and unbonded or loosely bonded steel strand), anchor structure, installation stress, corrosion and seepage prevention, as well as the structural bonding of the base material in concrete, the difference in shrinkage ratio of different materials, and the cracks generated in the concrete of the anchoring zone under the load of structural components.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this application and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide an anchor structure that includes a secondary grouting return channel, which can achieve sealing between the internal components and corrosion protection for each component.

[0006] Another objective of this invention is to provide a method for constructing anchor bolts, wherein the anchor bolts obtained by the method have anti-seepage and anti-corrosion properties.

[0007] Another object of the present invention is to provide an anchor body that has the advantages of being seepage-proof and corrosion-resistant.

[0008] To achieve the above objectives, the present invention provides an anchor bolt structure, including a busbar substrate, a tensioning structure, and a fixing structure. The fixing structure is located at the lower end of the busbar substrate and is used for anchoring the lower part of the anchor bolt structure. The tensioning structure is located at the upper end of the busbar substrate and is used for tensioning and locking the busbar substrate. An isolation structure is provided on the outside of the busbar substrate, and a first annular structure is formed between the inner side of the isolation structure and the outer side of the busbar substrate. The anchor bolt structure also includes a side grouting pipe, which extends from the top to the bottom of the anchor bolt structure, and the bottom of the side grouting pipe is connected to the bottom of the first annular structure. The internal space defined by the first annular structure and the side grouting pipe is isolated from the outside of the isolation structure and the side grouting pipe, forming a secondary grouting backflow channel.

[0009] In a preferred embodiment, the busbar substrate is unbonded / slightly bonded steel strand.

[0010] In a preferred embodiment, the upper tensioning structure includes a tensioning anchoring device, which includes an anchor plate, an anchor, and a working wedge. The anchor plate is a sinking anchor plate, and the anchor plate includes a tensioning anchoring space inside. The end of the busbar substrate passes through the tensioning anchoring space from the lower part of the anchor plate. The anchor and the working wedge are disposed in the tensioning anchoring space. The upper end of the busbar substrate is fixed in the tensioning anchoring space of the anchor plate by the anchor and the working wedge, and prestress is applied to the busbar substrate by the anchor and the working wedge.

[0011] In a preferred embodiment, the anchor plate further includes a busbar through hole disposed at the lower part of the anchor plate and coaxially connected with the tensioning and anchoring space. The busbar substrate passes through the busbar through hole and enters the tensioning and anchoring space. The anchor includes a first flow channel connected between the tensioning and anchoring space and the busbar through hole. The gaps between the anchorage and working wedges and the tensioning and anchoring space, the gaps between the busbar substrate and the anchorage and working wedges, the gaps between the busbar substrate and the busbar through hole, and the upper channel of the first flow channel constitute the secondary grouting backflow channel.

[0012] In a preferred embodiment, the central isolation structure includes a hollow tube, the upper end of which is sleeved on the lower part of the anchor plate, and the lower end is sealed to the upper part of the fixing structure. The middle part of the busbar substrate is disposed inside the hollow tube, and the outer side of the busbar substrate and the inner side of the hollow tube form a first annular structure.

[0013] In a preferred embodiment, the lower fixing structure includes a bearing device, which includes a bearing plate, a sealing cover, and a locking device. The bearing plate includes a bearing disk and a protective tube. The bearing disk has a disk-shaped structure and is located in the middle of the bearing device. The bearing disk includes a second flow channel that communicates with a first annular structure. The protective tube is located on the upper surface of the bearing disk and is sealed to the isolation structure. The gap between the inner wall of the protective tube and the busbar substrate communicates with the first annular structure. The sealing cover is sealed to the lower surface of the bearing disk, and a bearing space is formed between the inner wall of the sealing cover and the lower surface of the bearing disk. The sealing cover includes a side pipe that communicates with the bearing space and is used to seal the bottom of the side grouting pipe. The locking device is located within the bearing space, and the portion of the busbar substrate that passes through the bearing disk is fixed to the bearing plate and the sealing cover by the locking device.

[0014] In a preferred embodiment, the gap between the inner side of the protective tube and the outer side of the busbar substrate, the second flow channel, the bearing space, the gap between the inner wall of the sealing cover and the locking device, and the side pipe constitute the lower channel of the secondary grouting backflow channel.

[0015] In a preferred embodiment, the bearing plate further includes a central grouting pipe perforation for the installation of a pile grouting pipe. The pile grouting pipe is located within the isolation structure and extends downward from the top of the isolation structure through the bearing plate, the locking device, and the sealing cover to the bottom of the anchor hole.

[0016] In a preferred embodiment, the grouting pipe of the pile body is sealed to the sealing cover.

[0017] To achieve the above objectives, the present invention provides a construction method for an anchor bolt. This method employs the aforementioned anchor bolt structure and includes: lowering the assembled anchor bolt structure into a pre-fabricated anchor bolt hole, forming a first grouting channel between the outer side of the anchor bolt structure and the inner side of the anchor bolt hole; performing primary grouting through the first grouting channel, wherein the medium for primary grouting is a curing medium; performing secondary grouting through a second grouting channel, wherein the medium for secondary grouting is an anti-corrosion medium and / or a waterproof medium; after the primary grouting solidifies, the anchor bolt structure and the anchor bolt hole are integrated to provide load-bearing support; the secondary grouting is used to seal the gaps between components within the secondary grouting backflow channel inside the anchor bolt structure, and / or to provide corrosion protection for the components within the secondary grouting backflow channel.

[0018] In a preferred embodiment, after grouting is performed once through the first grouting channel, a second grouting is performed through the second grouting channel, or before grouting is performed once through the first grouting channel, a second grouting is performed through the second grouting channel.

[0019] In a preferred embodiment, a first grouting is completed before the second grouting. After the first grouting is completed and solidified to meet the design requirements, the anchor structure is prestressed and anchored.

[0020] In a preferred embodiment, secondary grouting involves injecting grout from the inlet of the secondary grouting return channel until the grout returns from the outlet.

[0021] In a preferred embodiment, secondary grouting involves injecting grout from the outlet of the secondary grouting return channel until the grout returns from the inlet.

[0022] In a preferred embodiment, grouting through the first grouting channel further includes: lowering a temporary auxiliary grouting pipe into the first grouting channel; and performing grouting through the temporary auxiliary grouting pipe in a bottom-up reverse discharge manner.

[0023] To achieve the above objectives, the present invention provides an anchor body, which adopts the aforementioned construction method. The construction method includes: using the aforementioned anchor structure and setting the assembled anchor structure in the anchor hole; filling the space between the outer side of the anchor structure and the inner side of the anchor hole with a primary grouting medium; and filling the secondary grouting return channel of the anchor structure with a secondary grouting medium.

[0024] In a preferred embodiment, the primary grouting medium is cement mortar, and the secondary grouting medium is C40 grouting material.

[0025] Compared with the prior art, the anchor structure, construction method, and anchor body formed by the present invention have the following advantages: This solution provides isolation devices at the tensioning and anchoring ends, the load-bearing fixing ends, and the middle part of the busbar substrate of the anchor structure. A secondary grouting return channel is formed inside the isolation device. Secondary grouting is performed through this channel, injecting waterproof and / or anti-corrosion media. This seals the various components within the isolation structure and provides corrosion protection for each component, giving the entire anchor body excellent water resistance and corrosion resistance. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the anchor bolt structure according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the upper part of the anchor bolt structure according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the lower part of the anchor bolt structure according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the tensioning structure at the upper part of the anchor bolt structure according to an embodiment of the present invention; Figure 5This is a schematic diagram of the fixing structure at the lower part of the anchor bolt structure according to an embodiment of the present invention; Figures 6 to 8 This is a schematic diagram of the structure of an anchor plate according to an embodiment of the present invention; Figure 9 This is a schematic diagram showing the direction of core grouting and overflow of an anchor structure according to an embodiment of the present invention. Figures 10 to 12 This is a schematic diagram of the structure of an anchor plate according to another embodiment of the present invention; Figure 13 This is a schematic diagram showing the direction of core grouting and overflow of an anchor structure according to another embodiment of the present invention; Figures 14 to 15 These are schematic diagrams of the bearing plate according to two embodiments of the present invention. Figures 16 to 17 This is a schematic diagram of the sealing cover of the anchor bolt structure according to an embodiment of the present invention; Figure 18 This is a schematic diagram showing the directions of internal and external grouting at a fixed structure according to an embodiment of the present invention; Figures 19 to 20 This is a schematic diagram of the structure of a support plate according to another embodiment of the present invention; Figures 21 to 22 This is a schematic diagram of the structure of a sealing cover according to an embodiment of the present invention; Figure 23 This is a schematic diagram of the direction of internal and external grouting according to another embodiment of the present invention.

[0027] Explanation of key figure labels: 1-Anchor plate, 101-Tensioning and anchoring space, 102-Straight reinforcement, 103-Horizontal reinforcement, 104-Ring reinforcement, 105-Busbar through hole, 106-Reverse grouting channel, 2-Side grouting pipe, 3-Upper spiral reinforcement, 4-Hollow pipe, 5-Sealing pressure pipe, 6-Lower spiral reinforcement, 7-Bearing plate, 701-Bearing disc, 702-Protective pipe, 703-Bolt hole, 704-Sealing groove, 705-Bearing hole, 706-Central grouting pipe perforation, 707-Side grouting pipe perforation, 708-Second flow channel, 709-Side connecting pipe, 8-Locking device, 9-Sealing ring, 10-Sealing 1001-Bearing space, 1002-Side pipe, 1003-Fixing through hole, 11-Sealing gasket / sealing ring, 12-Locking nut, 13-Pile grouting pipe, 1301-Center pipe, 14-Guide frame constraint ring, 15-Guide bracket, 16-Extrusion sleeve / spring, 17-Pressure tube / extrusion spring, 18-Hex nut, 19-Busbar substrate, 20-Isolation bracket, 21-Waterstop steel ring, 22-Sealing pipe, 23-Anchor under steel mesh, 24-Anchor and working clamp, 2401-First flow channel, 25-C40 grouting material, 26-Epoxy resin adhesive. Detailed Implementation

[0028] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0029] Unless otherwise expressly stated, throughout the specification and claims, the term "comprising" or its variations such as "including" or "comprises" shall be understood to include the stated elements or components without excluding other elements or other components.

[0030] like Figures 1 to 5 As shown, an anchor bolt structure according to a preferred embodiment of the present invention includes a busbar substrate 19, a tensioning structure, and a fixing structure. The fixing structure is located at the lower end of the busbar substrate 19 and is used for anchoring the lower part of the anchor bolt structure. The tensioning structure is located at the upper end of the busbar substrate 19 and is used for tensioning and locking the busbar substrate 19. An isolation structure is provided on the outside of the busbar substrate 19, and a first annular structure is formed between the inner side of the isolation structure and the outer side of the busbar substrate 19. The anchor bolt structure also includes a side grouting pipe 2, which extends from the top to the bottom of the anchor bolt structure, and the bottom of the side grouting pipe 2 is connected to the bottom of the first annular structure. The side grouting pipe 2 and the first annular structure are isolated from the outside of the isolation structure and form a secondary grouting backflow channel.

[0031] In some implementations, the so-called primary and secondary grouting in anchor bolt construction generally proceed as follows: After the anchor bolt hole is completed, the assembled anchor bolt structure is lowered in, and then the space inside the anchor bolt hole outside the anchor bolt is grouted for the first time. After the first grouting solidifies and achieves the desired effect, the busbar substrate 19 is tensioned and prestressed for anchoring. Then, a sealing and anti-corrosion medium is injected into the secondary grouting return channel. This process is only applicable to prestressed anchor bolt structures. However, for non-prestressed anchor bolt structures, the difference between primary and secondary grouting is merely a matter of name and does not imply a difference in construction sequence. In this case, the primary and secondary grouting can be performed in any order, or even simultaneously, only the grouting media used in the primary and secondary grouting are different.

[0032] In some embodiments, the secondary grouting return channel is included in the upper, middle and lower parts of the anchor structure. The secondary grouting return channel is formed by the first annular structure and the side grouting pipe 2 in the entire anchor structure. The first annular structure and the side grouting pipe 2 are connected in the lower part, and the outlet and inlet are both in the upper part. The so-called outlet and inlet are only relative and theoretically can be interchanged.

[0033] In some implementations, the upper, middle, and lower parts of the anchor bolt structure are generally as follows: the upper part generally includes various components of the tension anchoring structure such as the anchor plate 1, commonly known as the tension anchoring end (generally provided in prestressed anchor bolt structures); the middle part mainly includes the isolation structure and its internal busbar base material 19 and isolation bracket 20, etc.; the lower part mainly includes the bearing plate 7 and other bearing fixing devices, commonly known as the bearing end.

[0034] In some embodiments, the busbar substrate 19 is an unbonded or loosely bonded steel strand, the two ends of which are used to achieve fixation and tensioning with the tensioning structure and the fixed structure.

[0035] like Figures 6 to 8 As shown, in some embodiments, the upper tensioning structure includes a tensioning anchoring device, which mainly includes an anchor plate 1, an anchor, and a working clamp 24. In this embodiment, the anchor plate 1 is a sinking anchor plate, but the present invention is not limited thereto. Various types of anchor plates 1 in the prior art can be applied to the technical solutions of the present invention, or can be applied after simple modifications. The anchor plate 1 includes a tensioning and anchoring space 101. The upper end of the busbar substrate 19 passes through the tensioning and anchoring space 101 from the lower part of the anchor plate 1. The anchor and working clamp 24 are arranged in the tensioning and anchoring space 101. The anchor and working clamp 24 can apply prestress to the busbar substrate 19. In this embodiment, the anchor has a disc-shaped structure with multiple conical holes that match the working clamps. The conical holes are arranged in a direction that is larger at the top and smaller at the bottom. The working clamp has a two-lobed conical structure with a taper that matches the conical holes. The upper end of the busbar substrate 19 (steel strand) passes through the conical holes. After the two working clamps clamp the steel strand, they are embedded in the conical holes. The steel strand is locked together with the anchor, working clamp 24 and anchor plate 1 by the tension of the steel strand itself.

[0036] In some embodiments, the anchor plate 1 further includes a busbar through hole 105; the busbar through hole 105 is disposed at the lower part of the anchor plate 1 and coaxially communicates with the tensioning anchoring space 101. The diameter of the busbar through hole 105 is slightly smaller than the diameter of the tensioning anchoring space 101, and the diameter of the anchor is between the tensioning anchoring space 101 and the busbar through hole 105. The busbar substrate 19 passes through the busbar through hole 105 and enters the tensioning anchoring space 101, and is locked by the anchor and the working clamp 24, and prestress is applied to the steel strand. In some embodiments, the anchorage is further provided with a first flow channel 2401. In this embodiment, the first flow channel 2401 is a through hole that extends between the upper and lower surfaces of the anchorage to connect the tensioning and anchoring space 101 and the busbar through hole 105. The first flow channel 2401 can be located at the center of the anchorage or it can be arranged around the center of the anchorage and staggered with the tapered hole.

[0037] In some embodiments, the gap between the tensioning and anchoring space 101 and the anchor and working clamp 24, the gap between the busbar substrate 19 and the anchor and working clamp 24, the second flow channel, and the gap between the outer side of the busbar substrate 19 and the inner side of the busbar through hole 105 constitute the upper channel of the secondary grouting backflow channel, and the first annular structure is sealed and connected to the upper channel.

[0038] like Figure 9 As shown, in some embodiments, the side grouting pipe 2 is arranged side by side with the tensioning structure, the fixing structure and the first annular structure in the anchor bolt hole. Secondary grouting is carried out by the side grouting pipe 2 under a certain pressure until grout returns from the first flow channel 2401 at the anchor plate 1.

[0039] like Figures 10 to 13 As shown, in some embodiments, this example belongs to another anchor plate 1 structure, which anchor plate 1 and Figures 6 to 8 The difference in the embodiment shown is that the anchor plate 1 is provided with a reverse grouting channel 106 on one side of the tension anchoring space 101, and the lower part of the reverse grouting channel 106 is connected to the busbar through hole 105 of the anchor plate 1.

[0040] Please see Figure 13 In some embodiments, the grouting inlet and return outlet of the secondary grouting reverse discharge channel of the anchor structure of this scheme are actually interchangeable. In this embodiment, secondary grouting can be performed from the first flow channel 2401 or the reverse grouting channel 106, and grout can be returned from the top of the side grouting pipe 2.

[0041] Please see Figures 1 to 5 In some embodiments, the central isolation structure includes a hollow tube 4, the upper end of which is sleeved on the lower part of the anchor plate 1 and sealed to the lower end of the anchor plate 1 through a sealing pipe 22. The lower end of the hollow tube 4 is sealed to the upper part of the fixed structure. The middle part of the busbar substrate 19 is disposed inside the hollow tube 4, and the outer side of the busbar substrate 19 and the inner side of the hollow tube 4 form a first annular structure.

[0042] In some implementations, the hollow tube 4 of the isolation structure is made of either metal or non-metal. Regardless of whether the isolation structure is metal or non-metal, it needs to be able to withstand a certain amount of pressure.

[0043] like Figures 14 to 18As shown, in some embodiments, the lower fixing structure includes a bearing device, which mainly includes a bearing plate 7, a protective tube 702, a locking device 8, and a sealing cover 10. The bearing plate 7 includes a bearing disk 701 and a protective tube 702. The bearing disk 701 is arranged in a disk-shaped structure in the middle of the bearing device. The bearing plate 7 includes bearing holes 705, which are corresponding in number and position to the conical holes on the anchor. The lower end of the busbar substrate 19 passes through the bearing holes 705. The protective tube 702 is arranged on the upper surface of the bearing disk 701. The upper part of the protective tube 702 is sealed to the isolation structure (hollow tube 4), and the lower part of the protective tube 702 is sealed to the upper surface of the bearing disk 701 (e.g., but not limited to welding). The bearing holes 705 are located within the radial cross-sectional area of ​​the protective tube 702. The gap between the inner wall of the protective tube 702 and the busbar substrate 19 communicates with the upper first annular structure. The sealing cover 10 is sealed to the lower surface of the support plate 701 (e.g., but not limited to mechanical seal connection or welding), and a support space 1001 is formed between the inner wall of the sealing cover 10 and the lower surface of the support plate 701. A locking device 8 is disposed within the support space 1001, and the portion of the busbar substrate 19 passing through the support hole 705 is fixed to the support plate 7 by the locking device 8. A second flow channel 708 is also provided on the support plate 701. In this embodiment, the second flow channel 708 is a through hole intersecting with the support hole 705. The second flow channel 708 is also located within the radial cross-sectional area of ​​the protective tube 702 and the sealing cover, and the second flow channel 708 connects the inside of the protective tube 702 and the support space 1001 of the sealing cover 10.

[0044] Please see Figures 16 to 17 In some embodiments, a side pipe 1002 is also provided on the side wall of the sealing cover 10. The lower part of the side pipe 1002 communicates with the bearing space 1001 inside the sealing cover 10, and the upper part is sealed to the lower end of the side grouting pipe 2. A side grouting pipe perforation 707 is provided on the bearing plate 701. The side grouting pipe perforation 707 is located outside the radial cross-sectional area of ​​the protective pipe 702 and the sealing cover 10. The side grouting pipe perforation 707 allows the side grouting pipe 2 to pass through and also serves to stabilize the side grouting pipe 2. The side grouting pipe perforation 707 can also be set in the form of an avoidance notch, which makes installation more convenient.

[0045] In some embodiments, the lower end of the side grouting pipe 2, the side pipe 1002, the bearing space 1001, the second flow channel 708, and the gap between the inner wall of the protective pipe 702 and the busbar substrate 19 constitute the lower channel of the secondary grouting backflow channel.

[0046] Please see Figures 19 to 23 In some implementations, this embodiment is similar to Figures 14 to 18The difference in the illustrated embodiment is that the side pipe 709 is installed on the protective pipe 702, and the side grouting pipe perforation 707 or avoidance notch may not be provided on the bearing plate 701; otherwise, they are the same as those in the previous embodiment. Figures 14 to 18 The embodiments shown are the same.

[0047] Please see Figure 19 and Figure 23 In some embodiments, a central grouting pipe perforation 706 is also provided on the bearing plate 701. The central grouting pipe perforation 706 is generally located at the center of the bearing plate 701 and is used for the insertion of the central connecting pipe 1301. The upper end of the central connecting pipe 1301 is sealed and connected to the pile grouting pipe 13. The pile grouting pipe 13 is located inside the hollow pipe 4 and is arranged parallel to the steel strands. The pile grouting pipe 13 is generally located at the center, and multiple steel strands are arranged around the pile grouting pipe 13. The pile grouting pipe 13 can also be located in other positions, such as, but not limited to, on the outside of the hollow pipe 4, but it is preferred to be located at the center of the hollow pipe 4. The top of the pile grouting pipe 13 generally needs to extend to the top of the hollow pipe 4. The pile grouting pipe 13 and the central connecting pipe 1301 constitute a primary grouting channel, which is mainly used for the primary grouting of the anchor bolt holes. The center connector 1301 has external threads at both ends. After the upper end of the center connector 1301 passes through the central grouting pipe through hole 706, the external thread at the upper end is fixed to the bearing plate 701 by the locking nut 12. After the lower end of the center connector 1301 passes through the fixing through hole on the locking device 8 and the sealing cover 10, it protrudes outside the sealing cover 10. The external thread at the lower part of the center connector 1301 is used to fix the locking device 8 to the bearing plate 7 by the locking nut 12, and to press the upper edge of the sealing cover 10 against the sealing groove 704 on the lower surface of the bearing plate 701 by the locking nut 12, and to fix the sealing cover 10 to the bearing plate 7.

[0048] Please see Figure 19 and Figure 23 In some embodiments, an annular sealing groove 704 is provided on the ground on the side of the bearing plate 701 facing the sealing cover 10. A sealing ring 9 is provided in the sealing groove 704. During installation, the upper edge of the sealing cover 10 is embedded in the sealing groove 704 and the sealing ring 9 is squeezed to achieve a sealed connection between the sealing cover 10 and the bearing plate 7. A sealing gasket / sealing ring 11 is also provided between the fixing through hole of the sealing cover 10 and the locking nut 12. The sealing gasket / sealing ring 11 can seal the connection between the fixing through hole and the outside, thereby making the central pipe 1301 and the fixing through hole of the sealing cover 10 sealed. This ensures that after the pile grouting pipe 13 and the central pipe 1301 are connected, they are not connected to the first annular structure inside the hollow pipe 4.

[0049] In some embodiments, during assembly, the bearing end at the bottom of the anchor structure is first assembled, the lower end of the pile grouting pipe 13 is sealed and connected to the central connecting pipe 1301, the hollow pipe 4 is sleeved on the outside of the busbar substrate 19 and the pile grouting pipe 13, the bottom of the hollow pipe 4 is sealed and connected to the protective pipe 702 of the bearing plate 7, then the upper end of the hollow pipe 4 is sealed and connected to the lower part of the anchor plate 1, then the side grouting pipe 2 is sealed and connected to the side connecting pipe 1002, and finally the assembled anchor structure is inserted into the anchor hole to prepare for grouting.

[0050] Please see Figure 1 , Figure 3 and Figure 4 In some embodiments, the bearing plate 701 is also provided with bolt holes 703. The bolt holes 703 are arranged around the sealing groove 704 and the protective tube 702. The bolt holes 703 are mainly used to fix the guide frame assembly through the hexagonal nut 18. The guide frame assembly mainly includes the guide frame constraint ring 14, the guide bracket 15, the compression sleeve / spring 16, and the pressure tube / compression spring 17, etc.

[0051] Please see Figures 1 to 5 According to a preferred embodiment of the present invention, a construction method for an anchor bolt is provided. The method employs the aforementioned anchor bolt structure and includes: lowering the assembled anchor bolt structure into a pre-fabricated anchor bolt hole, forming a first grouting channel between the outer side of the anchor bolt structure and the inner side of the anchor bolt hole; performing primary grouting through the first grouting channel, wherein the medium for primary grouting is a curing medium; performing secondary grouting through a second grouting channel, wherein the medium for secondary grouting is an anti-corrosion medium and / or a waterproof medium; after the primary grouting solidifies, the anchor bolt structure and the anchor bolt hole are integrated to provide load-bearing support; the secondary grouting is used to seal the gaps between components within the secondary grouting backflow channel inside the anchor bolt structure, and / or to provide corrosion protection for the components within the secondary grouting backflow channel.

[0052] In some embodiments, after grouting is performed once through the first grouting channel, a second grouting is performed through the second grouting channel, or before grouting is performed once through the first grouting channel, a second grouting is performed through the second grouting channel.

[0053] In some implementations, a primary grouting is completed before the secondary grouting. After the primary grouting is completed and solidified to meet the design requirements, the anchor structure is prestressed and anchored.

[0054] In some implementations, secondary grouting involves injecting grout from the inlet of the secondary grouting return channel until grout returns from the outlet, or vice versa. In other words, the inlet and outlet of the secondary grouting return channel can be interchanged. Secondary grouting must be performed under certain pressure conditions. After grout returns, a vibrator can be used to assist in filling the gaps between the various components within the secondary grouting return channel.

[0055] In some embodiments, grouting through the first grouting channel further includes: lowering a temporary auxiliary grouting pipe into the first grouting channel; and performing grouting through the temporary auxiliary grouting pipe using a bottom-up backflow method. After the first grouting is completed, the temporary auxiliary grouting pipe (pile grouting pipe) can be removed.

[0056] An anchor bolt body formed by a construction method according to a preferred embodiment of the present invention, which employs the aforementioned construction method, includes: the anchor bolt structure being installed in the anchor bolt hole; primary grouting medium being filled between the outer side of the anchor bolt structure and the inner side of the anchor bolt hole; and secondary grouting medium being filled in the secondary grouting return channel of the anchor bolt structure.

[0057] In some embodiments, the primary grouting medium is, for example, but not limited to, cement mortar, and the secondary grouting medium is, for example, but not limited to, C40 grouting material. The secondary grouting medium can be a waterproof medium, an anti-corrosion medium, or a medium that can be both waterproof and anti-corrosion.

[0058] In some embodiments, the upper structure and the lower structure may adopt the following technical solutions / features disclosed in the patent technologies, or combinations thereof: 202121889603.3, 202121899942.X, 202122098848.0, 202220213638.3, 202220213881.5, 202210092313.9, 202210092506.4, 202210417364.4, 202210415981.0, 202220962292.7, 202310371746.2, 202320766811.7, 202320767218.4, 202322525433.6. 201510410266.8, 201520505442.1, 201610555342.9, 202022757412.3, 202110925804.2, 202121888917.1, 202121882786.6, 202121889603.3, 202210092506.4, 202210417364.4, 202220962292.7, 202320089972.7, 202310371746.2, 202320767218.4. It should be considered that the content disclosed in the above-mentioned patent has been recorded in this patent specification. Those skilled in the art can understand, improve and apply the various components of the upper tensioning anchor end and the lower bearing end involved in this patent by combining the above-mentioned patent content and other existing technologies.

[0059] In summary, the anchor bolt structure, its construction method, and the anchor bolt body formed by the construction method have the following advantages: The prestressed anti-buoyancy anchor structure invented in this paper has been verified through experiments and engineering applications for different types of parent materials in structural concrete slabs, including anchor tension load and seepage prevention after anchor sealing. It is a precedent since the implementation of the new standard JGJ476-2019, which achieves the solution of terminal water-stopping loop in the early construction process by changing the anchor structure design and grouting process. It completely solves the problem of water seepage in the later stage of anchoring, avoids the safety hazards of building structure caused by the failure of tension force due to corrosion of anchor end anchors (anchors, wedges or fine-rolled threaded steel anchors) caused by long-term water seepage, and solves the difficulty of water-stopping in the later stage and engineering costs.

[0060] Structural features: 1. Install sealed metal or PE sheaths at both ends of the anchor bolt base material to provide relatively independent space for the anchor bolt base material.

[0061] Function and purpose: Although the outer layer of the prestressed anchor bar was treated before this invention, such as a) the surface of the fine-rolled threaded steel bar is generally coated with epoxy resin paint and then covered with a PE layer. The PE outer layer is close to the threaded steel bar and has anti-rust and anti-corrosion functions, but has no expansion space. Therefore, after the anchor pile is poured, the fine-rolled threaded steel bar body is bonded to the pile concrete as one. When the anchor body is tensioned, the parent material of the bar body will elongate under the action of tension. At this time, the plastic deformation of the concrete bonded to it is less than the elongation of the parent line, and cracks will appear in the pile concrete, forming a seepage channel. b. Using unbonded steel strands or loosely bonded steel strands as the base material of the pole, the wire structure is made of 1X7 strands of steel wire twisted together, coated with grease or loosely bonded adhesive, and then wrapped with a PE layer sheath. Although it has anti-rust and anti-corrosion functions and a certain amount of expansion and contraction space, the thickness of its PE sheath layer is about 1-2mm. During the installation and anchoring process, there are inevitable factors such as scratches and collisions that cause damage to the PE sheath layer. Foundation water enters from the PE break and extends up to the anchoring end along the gaps in the steel strand twisting.

[0062] The anchor rod sleeve and the anchor body of this invention have a large free elongation space. After the pile concrete is poured, it does not adhere to the busbar to form an independent separate body. During tensioning, the elongation of the busbar and the tension force will not affect the pile concrete, eliminating the previous phenomenon of water seepage in the pile. By matching the bearing head, rod sleeve, and settlement-type tensioning anchor end, an internal independent cavity is formed. After the rod stress is applied, the grouting process inside the sleeve is used to grout the bearing end, the inside of the sleeve, and the anchor end, so that the entire rod body forms an independent and sealed body. The internal grouting medium has both anti-corrosion and waterproof functions, thus completing the water-stopping closed loop of the anchor rod body.

[0063] 2. The anchor bolt bearing end adopts a sealed internal flow channel structure.

[0064] Function and purpose: The bearing end is generally located in bedrock or reinforced soil layers. During tensioning, the anchor's bearing capacity relies on the bond and friction between the bearing head, concrete, and soil. Under tension, strain cracks will appear in the concrete of the bearing end's load-bearing zone, creating seepage points. Therefore, the bearing end is one of the most critical points for leakage and corrosion prevention. a) Because the outer protective layer (plastic sheath) of the steel strand needs to be removed at the joint between the extrusion sleeve and the steel strand, exposed seepage points are formed at the end, allowing groundwater to seep from the end steel strand joints and the outer surface of the steel strand. Therefore, the patented design uses an overall sealed bearing end to create a completely enclosed space. b) A channel is set within the sealed bearing body. This channel can serve as either an injection channel or an venting and overflow channel, depending on the construction process.

[0065] The bearing end adopts a sealed internal flow channel structure design, which is a supporting component for completing the internal grouting process. The grouting medium used in the internal grouting process can solve the corrosion and seepage prevention problems of the bearing end seal.

[0066] 3. The anchoring end of the anchor bolt adopts a sinking structure.

[0067] Function and purpose: Located at the junction of the base slab (raft slab) and the surface layer. The anchoring point between the anchor plate and the anchor strands requires removal of the surface sheath, similar to the load-bearing end. Therefore, a leakage point appears at this connection. To prevent cracks in the base slab, a sinking anchor plate is used to ensure sufficient thickness of the surface layer within the base slab for the tensioning anchor. The lower end of the anchor plate connects to the rod sheath to form an independent cavity. After tensioning, the tensioning and anchoring assembly is completely sealed and poured into the sinking anchor plate through high-pressure grouting at the anchor grouting hole. After the medium layer inside the sinking anchor plate cavity dries, the entire anchor structure assembly forms a sealed closed loop beneath the building surface.

[0068] The foregoing description of specific exemplary embodiments of the invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the invention, as well as various different choices and variations. The scope of the invention is intended to be defined by the claims and their equivalents.

[0069] The foregoing description of specific exemplary embodiments of this application is for illustrative and explanatory purposes. These descriptions are not intended to limit this application to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of this application and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of this application, as well as various different choices and variations. The scope of this application is intended to be defined by the claims and their equivalents.

Claims

1. A method for constructing an anchor bolt, the anchor bolt structure comprising a busbar substrate, a tensioning structure, and a fixing structure, wherein the fixing structure is located at the lower end of the busbar substrate and is used for anchoring the lower part of the anchor bolt structure; the tensioning structure is located at the upper end of the busbar substrate and is used for tensioning and locking the busbar substrate; characterized in that: An isolation structure is provided on the outside of the busbar substrate, and a first annular structure is formed between the inner side of the isolation structure and the outer side of the busbar substrate; the anchor structure also includes a side grouting pipe, which extends from the top to the bottom of the anchor structure, and the bottom of the side grouting pipe is connected to the bottom of the first annular structure. The internal space defined by the first annular structure and the side grouting pipe is isolated from the outside of the isolation structure and the side grouting pipe, forming a secondary grouting backflow channel; The construction method includes: The anchor structure is lowered into the prefabricated anchor hole, and a first grouting channel is formed between the outer side of the anchor structure and the inner side of the anchor hole; A grouting process is performed through the first grouting channel, wherein the medium for the first grouting is a curing medium; Secondary grouting is performed through a second grouting channel, wherein the medium for secondary grouting is an anti-corrosion medium and / or a waterproof medium; and After the first grouting solidifies, the anchor structure and the anchor hole are integrated to provide load-bearing function; the second grouting is used to seal the gaps between the components in the secondary grouting backflow channel inside the anchor structure, and / or to protect the components in the secondary grouting backflow channel from corrosion. The first grouting is completed before the second grouting. After the first grouting is completed and solidified to meet the design requirements, the anchor structure is prestressed and anchored.

2. The construction method of the anchor bolt as described in claim 1, characterized in that, The busbar substrate is unbonded / slow-bonded steel strand.

3. The construction method of the anchor bolt as described in claim 1, characterized in that, The tensioning structure includes a tensioning anchoring device, which comprises: An anchor plate, which is a sinking anchor plate, includes a tensioning and anchoring space inside the anchor plate, and the end of the busbar substrate passes through the tensioning and anchoring space from the bottom of the anchor plate; and An anchor and working clamp are disposed within the tensioning and anchoring space. The upper end of the busbar substrate is fixed within the tensioning and anchoring space of the anchor plate by the anchor and working clamp, and prestress is applied to the busbar substrate by the anchor and working clamp.

4. The construction method of the anchor bolt as described in claim 3, characterized in that, The anchor plate also includes a busbar through hole, which is disposed at the lower part of the anchor plate and coaxially connected with the tensioning and anchoring space. The busbar substrate passes through the busbar through hole and enters the tensioning and anchoring space. The anchor includes a first flow channel, which is connected between the tensioning and anchoring space and the busbar through hole. The gap between the anchor and the working wedge and the tensioning and anchoring space, the gap between the busbar substrate and the anchor and the working wedge, the gap between the busbar substrate and the busbar through hole, and the first flow channel constitute the upper channel of the secondary grouting backflow channel.

5. The construction method of the anchor bolt as described in claim 3, characterized in that, The central isolation structure includes a hollow tube, the upper end of which is sleeved on the lower part of the anchor plate, and the lower end is sealed to the upper part of the fixing structure. The middle part of the busbar substrate is disposed inside the hollow tube, and the outer side of the busbar substrate and the inner side of the hollow tube form the first annular structure.

6. The construction method of the anchor bolt as described in claim 3, characterized in that, The lower fixing structure includes a support device, which comprises: The support plate includes: A support plate, which has a disc-shaped structure, is disposed in the middle of the support device. The support plate includes a second flow channel, which communicates with the first annular structure. A protective tube is disposed on the upper surface of the bearing plate. The protective tube is sealed to the isolation structure, and the gap between the inner wall of the protective tube and the busbar substrate is connected to the first annular structure. A sealing cover, which is sealed to the lower surface of the support plate, forms a support space between the inner wall of the sealing cover and the lower surface of the support plate. The sealing cover includes a side pipe that communicates with the support space, and the side pipe is used for sealing communication with the bottom of the side grouting pipe; and A locking device is provided within the bearing space, and the portion of the busbar substrate that passes through the bearing plate is fixed together with the bearing plate and the sealing cover by the locking device.

7. The construction method of the anchor bolt as described in claim 6, characterized in that, The gap between the inner side of the protective pipe and the outer side of the busbar substrate, the second flow channel, the bearing space, the gap between the inner wall of the sealing cover and the locking device, and the side pipe constitute the lower channel of the secondary grouting backflow channel.

8. The construction method of the anchor bolt as described in claim 6, characterized in that, The bearing plate also includes a central grouting pipe perforation for the installation of the pile grouting pipe, which is located within the isolation structure. The pile grouting pipe extends downward from the top of the isolation structure through the bearing plate, the locking device, and the sealing cover to the bottom of the anchor hole.

9. The construction method of the anchor bolt as described in claim 8, characterized in that, The grouting pipe of the pile body is sealed to the sealing cover.

10. The construction method as described in claim 1, characterized in that, The secondary grouting involves injecting grout from the inlet of the secondary grouting return channel until the grout returns from the outlet.

11. The construction method as described in claim 1, characterized in that, The secondary grouting involves injecting grout from the outlet of the secondary grouting return channel until the grout returns from the inlet.

12. The construction method as described in claim 1, characterized in that, The grouting process through the first grouting channel also includes: A temporary auxiliary grouting pipe is lowered into the first grouting channel; Grouting is performed once through the temporary auxiliary grouting pipe using a bottom-up reverse discharge method.

13. An anchor bolt body, characterized in that, include: The anchor structure as described in any one of claims 1 to 9 is disposed within the anchor hole; A primary grouting medium is used to fill the space between the outer side of the anchor structure and the inner side of the anchor hole; and The secondary grouting medium is filled into the secondary grouting return channel of the anchor structure.

14. The anchor bolt body as described in claim 13, characterized in that, The primary grouting medium is cement mortar, and the secondary grouting medium is C40 grouting material.

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