Hollow screw rod structure in finish rolling and anchor rod structure comprising the same

Abstract

The application discloses a kind of finish rolling hollow threaded steel bar structures and the anchor rod structure comprising the structure, finish rolling hollow threaded steel bar structure includes hollow structure and outer thread structure;Hollow structure is arranged in finish rolling hollow threaded steel bar structure, hollow structure is coaxially arranged with finish rolling hollow threaded steel bar structure;Outer thread structure is arranged on the outer wall of finish rolling hollow threaded steel bar structure, and outer thread structure can be used for being connected with the thread of matching inner thread structure.This finish rolling hollow threaded steel bar structure of the application can form a part of secondary grouting backflow channel by its hollow structure, so as to not only complete the function that ordinary finish rolling threaded steel can complete, but also reduce the manufacturing difficulty and manufacturing cost of anchor rod structure.

Description

Technical Field

[0001] This invention relates to the field of building construction, and in particular to a precision-rolled hollow threaded steel bar structure and an anchor structure incorporating the same structure. Background Technology

[0002] As the world economy entered a phase of rapid development in the 21st century, especially with China's economic growth leading the world, my country's infrastructure construction has seen unprecedented improvements in mechanisms and technological innovation. The era of national stimulus to boost domestic demand and promote large-scale infrastructure development has arrived, and pressure-type prestressed anti-buoyancy anchors have established their important position in the field of building foundation engineering in terms of research and development, production, and application. Traditional anti-buoyancy anchors are mainly composed of two types: pressure-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 early anti-buoyancy anchor standards required the use of ordinary threaded steel bars as the base material, corresponding defects gradually became apparent, such as low anchorage pull-out resistance, poor disturbance resistance stability, and weak corrosion and seepage resistance, leading to safety accidents such as shear fracture, misalignment, cracking, and leakage in the load-bearing beams of building foundations. Based on this, the state issued JGJ476-2019 "Technical Standard for Anti-buoyancy of Building Engineering", which put forward corresponding requirements for the design of anchor bolts and made technical requirements for the anchoring pull-out resistance, pull-out anchoring force, length, corrosion resistance and seepage resistance of different types of anti-buoyancy anchor bolts in different strata.

[0003] Since the implementation of the new standard, the prestressed anti-buoyancy anchor rods currently used in the market are mainly composed of three categories: fine-rolled threaded steel, unbonded steel strand, and loosely bonded steel strand. Although anchor rod manufacturers have made iterative innovations in the design and development of finished anchor rods regarding pull-out anchoring force, corrosion resistance, and seepage resistance, the problem of underground foundation water leakage at the upper anchoring end of the anti-buoyancy anchor rod has not been effectively solved due to factors such as the requirements of the base material of the prestressed anti-buoyancy anchor rod (fine-rolled threaded steel and unbonded or loosely bonded steel strand), anchor rod structure, installation stress, corrosion and seepage resistance, as well as the structural bonding of the base material 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] However, for anchor structures using precision-rolled threaded steel and unbonded or loosely bonded steel strands, if an isolation structure for water drainage and seepage prevention is added, a second grouting backflow channel can only be formed by connecting the side grouting pipe with the inner side of the isolation structure and the outer side of the busbar substrate at the bottom. This allows for the completion of water drainage and anti-corrosion medium injection through secondary grouting. The addition of the side grouting pipe undoubtedly increases the manufacturing cost and difficulty of the anchor structure.

[0005] To meet the waterproofing requirements for the connection between anchor bolts and underground foundation structures as specified in Clause 7.5.10 of JGJ476-2019 "Technical Standard for Anti-buoyancy of Building Engineering", water-stopping work can generally only be carried out on areas where seepage occurs after the anchor is sealed. This water-stopping treatment involves a large workload, high labor intensity, and high costs. Therefore, a new operating method that can overcome these problems is urgently needed.

[0006] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention 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

[0007] The purpose of this invention is to provide a precision-rolled hollow threaded steel bar structure, which can form part of a secondary grouting return channel through its own hollow structure, thereby reducing the manufacturing difficulty and cost of anchor bolt structures.

[0008] Another objective of this invention is to provide an anchor structure that utilizes the hollow structure of the precision-rolled hollow threaded steel bar itself to form part of a secondary grouting return channel, thereby achieving sealing between the internal components of the secondary grouting return channel and corrosion protection for each component.

[0009] To achieve the above objectives, the present invention provides a precision-rolled hollow threaded steel bar structure, including a hollow structure and an external thread structure; the hollow structure is disposed inside the precision-rolled hollow threaded steel bar structure and is coaxially arranged with the precision-rolled hollow threaded steel bar structure; the external thread structure is disposed on the outer wall of the precision-rolled hollow threaded steel bar structure and can be used to make threaded connections with a matching internal thread structure.

[0010] In a preferred embodiment, the precision-rolled hollow threaded steel bar structure further includes a first base circle diameter and a second base circle diameter, wherein the first base circle diameter and the second base circle diameter are not equal.

[0011] In a preferred embodiment, the diameter of the first base circle is equal to the diameter of the second base circle.

[0012] In a preferred embodiment, the hollow structure includes a first inner diameter and a second inner diameter, both of which are smaller than the first base circle diameter and the second base circle diameter.

[0013] In a preferred embodiment, the diameter of the first inner hole and the diameter of the second inner hole are equal.

[0014] In a preferred embodiment, the diameters of the first inner hole and the second inner hole are not equal.

[0015] In a preferred embodiment, the ratio of the first inner hole diameter to the first base circle diameter and the ratio of the second inner hole diameter to the second base circle diameter are within a certain range.

[0016] To achieve the aforementioned other objective, the present invention also provides an anchor structure, comprising the aforementioned precision-rolled hollow threaded steel bar structure, and further comprising: a tensioning and anchoring device and a fixing and bearing device, wherein the fixing and bearing device is located at the lower end of the anchor structure and is used for anchoring the lower part of the anchor structure; the tensioning and anchoring device is located at the upper end of the anchor structure and is used for tensioning and locking the anchor structure; the precision-rolled hollow threaded steel bar structure is disposed between the tensioning and anchoring device and the fixing and bearing device; an isolation structure is provided on the outside of the precision-rolled hollow threaded steel bar structure, and a first annular structure is formed between the inner side of the isolation structure and the outer side of the precision-rolled hollow threaded steel bar structure; the hollow structure of the precision-rolled hollow threaded steel bar structure and the first annular structure are connected at the lower part of the precision-rolled hollow threaded steel bar structure, and the internal space defined by the first annular structure and the hollow structure is isolated from the outside of the isolation structure, constituting a secondary grouting backflow channel.

[0017] In a preferred embodiment, the external thread structure at the upper end of the precision-rolled hollow threaded steel bar structure is used to achieve fixation and tensioning with the tensioning anchoring device.

[0018] In a preferred embodiment, the external thread structure at the lower end of the precision-rolled hollow threaded steel bar structure is used to achieve fixation with the fixed bearing device.

[0019] In a preferred embodiment, the upper tensioning and anchoring device includes an anchor plate and a precision-rolled anchor; the anchor plate is a sinking anchor plate, and the anchor plate includes a tensioning and locking space inside. The end of the precision-rolled hollow threaded steel bar structure passes through the tensioning and locking space from the lower part of the anchor plate; the precision-rolled anchor is set in the tensioning and locking space, and the precision-rolled nut applies prestress to the precision-rolled hollow threaded steel bar structure through the external thread structure at the upper end of the precision-rolled hollow threaded steel bar structure.

[0020] In a preferred embodiment, the anchor plate further includes a rebar perforation and a first flow channel; the rebar perforation is located at the lower part of the anchor plate and is coaxially connected with the tensioning and locking space, and the finely rolled hollow threaded steel bar structure enters the tensioning and locking space after passing through the rebar perforation; the first flow channel is located between the tensioning and locking space and the rebar perforation; wherein the gap between the finely rolled anchor and the tensioning and locking space, the gap between the finely rolled hollow threaded steel bar structure and the rebar perforation, and the first flow channel are connected to the first annular structure and constitute the upper channel of the secondary grouting backflow channel.

[0021] 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 fixed bearing device. The middle part of the fine-rolled hollow threaded steel bar structure is set inside the hollow tube. The outer side of the fine-rolled hollow threaded steel bar structure and the inner side of the hollow tube form a first annular structure and constitute the central channel of the secondary grouting backflow channel.

[0022] In a preferred embodiment, the lower fixed bearing device includes a bearing plate, a precision-rolled nut, and a sealing cover. The bearing plate includes a bearing disk and a protective tube. The bearing disk has a disk-shaped structure and includes a bearing hole through which the lower end of the precision-rolled hollow threaded steel bar structure passes. The protective tube is coaxially disposed on the upper surface of the bearing disk with the bearing hole and is sealed to the isolation structure. The gap between the inner wall of the protective tube and the precision-rolled hollow threaded steel bar structure communicates with the first annular structure. The precision-rolled nut is connected to the external thread structure of the portion of the precision-rolled hollow threaded steel bar structure that passes through the bearing hole. A second flow channel is provided at the top of the precision-rolled nut, and the second flow channel communicates with the gap between the precision-rolled hollow threaded steel bar structure and the inner wall of the bearing hole. The sealing cover is sealed to the lower surface of the bearing plate, and a bearing space is formed between the inner wall of the sealing cover and the lower surface of the bearing plate. The portion of the precision-rolled hollow threaded steel bar structure that passes through the bearing hole and the precision-rolled nut are sealed within the bearing space. The bearing space simultaneously connects the hollow structure at the lower end of the precision-rolled hollow threaded steel bar structure and the second flow channel.

[0023] In a preferred embodiment, the gap between the bearing space, the second flow channel, the inner wall of the protective pipe, and the fine-rolled hollow threaded steel bar structure constitutes the lower channel of the secondary grouting backflow channel.

[0024] In a preferred embodiment, the anchor structure further includes a secondary bearing body, which is located in the middle of the fine-rolled hollow threaded steel bar structure. The upper and lower ends of the secondary bearing body are sealed to the isolation structure, and the gap between the inner side of the secondary bearing body and the outer side of the fine-rolled hollow threaded steel bar structure constitutes part of the middle channel of the secondary grouting backflow channel.

[0025] In a preferred embodiment, the secondary bearing body includes a secondary bearing plate, a secondary locking nut, an upper connector, a lower connector, and a grouting pipe perforation. The secondary bearing plate includes a secondary bearing hole through which a finely rolled hollow threaded steel bar structure passes. The secondary locking nut is connected to the external thread structure in the middle of the finely rolled hollow threaded steel bar structure and abuts against the upper surface of the secondary bearing plate. The lower end of the upper connector is sealed to the upper surface of the secondary bearing plate and is arranged around the secondary bearing hole. The finely rolled hollow threaded steel bar structure passes through the upper connector, and the upper part of the upper connector is sealed to the isolation structure. The upper end of the lower connector is sealed to the lower surface of the secondary bearing plate and is arranged around the secondary bearing hole. The finely rolled hollow threaded steel bar structure passes through the lower connector, and the lower part of the lower connector is sealed to the isolation structure. The grouting pipe perforation is located on the secondary bearing plate and outside the upper and lower connectors. The grouting pipe perforation is used for the insertion of the pile grouting pipe.

[0026] Compared with existing technologies, the precision-rolled hollow threaded steel bar structure and the anchor rod structure including the present invention have the following advantages: The hollow structure of the precision-rolled hollow threaded steel bar structure itself can become part of the secondary grouting backflow channel, thereby reducing the manufacturing difficulty and cost of the anchor rod structure. Isolation devices are provided at the tensioning anchor end and the bearing fixing end of the anchor rod structure, as well as in the middle part of the precision-rolled hollow threaded steel bar structure. The inner side of the isolation device forms a first annular structure with the outer side of the precision-rolled hollow threaded steel bar structure. The first annular structure and the hollow structure of the precision-rolled hollow threaded steel bar structure form a secondary grouting backflow channel. Secondary grouting is performed through the secondary grouting backflow channel, injecting waterproof and / or anti-corrosion media, which can seal the various components inside the isolation structure and provide anti-corrosion protection for each component, giving the entire anchor rod body excellent water resistance and corrosion resistance. Attached Figure Description

[0027] Figure 1 This is a radial cross-sectional schematic diagram of a precision-rolled hollow threaded steel bar structure according to an embodiment of the present invention;

[0028] Figure 2 This is a partial external structural schematic diagram of a precision-rolled hollow threaded steel bar structure according to an embodiment of the present invention;

[0029] Figure 3 This is a partial cross-sectional view of an external thread structure according to an embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of the overall structure of the anchor bolt structure according to an embodiment of the present invention;

[0031] Figure 5 This is a schematic diagram of the upper part of the anchor bolt structure according to an embodiment of the present invention;

[0032] Figure 6 This is a schematic diagram of the grout return flow direction of an anchor structure according to an embodiment of the present invention;

[0033] Figure 7 This is a schematic diagram of the lower part of the anchor bolt structure according to an embodiment of the present invention;

[0034] Figure 8 This is a schematic diagram of a fixed bearing device at the lower part of an anchor structure according to an embodiment of the present invention;

[0035] Figure 9 This is a schematic diagram of the upper channel of an anchor bolt structure according to an embodiment of the present invention;

[0036] Figures 10 to 12 This is a schematic diagram of the anchor plate of an anchor bolt structure according to an embodiment of the present invention.

[0037] Figures 13 to 15 This is a schematic diagram of the anchor plate of an anchor bolt structure according to another embodiment of the present invention.

[0038] Figure 16 This is a structural schematic diagram of a reverse grouting method for an anchor bolt structure according to another embodiment of the present invention;

[0039] Figure 17 This is a schematic diagram of the lower channel of an anchor bolt structure according to an embodiment of the present invention;

[0040] Figures 18 to 19 This is a schematic diagram of the bearing plate of the anchor structure according to an embodiment of the present invention;

[0041] Figures 20 to 21 This is a schematic diagram of the sealing cover of the anchor bolt structure according to an embodiment of the present invention;

[0042] Figures 22 to 23 This is a structural schematic diagram of the fixing bracket of the anchor bolt structure according to an embodiment of the present invention;

[0043] Figure 24 This is a schematic diagram of the lower channel of an anchor structure according to another embodiment of the present invention;

[0044] Figures 25 to 26 This is a schematic diagram of the integrated structure of the support plate and the sealing cover according to an embodiment of the present invention;

[0045] Figures 27 to 28 This is a schematic diagram of the structure of a sealing cap according to an embodiment of the present invention;

[0046] Figures 29 to 30 This is a structural schematic diagram of a secondary support structure according to an embodiment of the present invention.

[0047] Explanation of key figure labels:

[0048] dh - First base circle diameter, dv - Second base circle diameter, dr - First inner hole diameter, dl - Second inner hole diameter, h - Thread height, b - Thread root width, l - Pitch, r - Thread root arc, α - Chamfer, 1 - Anchor plate, 101 - Tensioning and locking space, 102 - First flow channel, 103 - Rebar perforation, 104 - Straight reinforcement, 105 - Bottom reinforcement, 106 - Connecting hole, 107 - Side grouting hole, 2 - Upper spiral reinforcement, 3 - Hollow tube, 4 - Fixed grout-stopping cement, 5 - Lower spiral reinforcement, 6 - Bearing plate, 601 - Bearing disc, 602 - Protective tube, 603 - Sealing groove, 604 - Sealing tube, 605 - Sealing cap, 6051 - Connecting through hole, 7 - Precision rolled nut, 7 01-Second flow channel, 8-Sealing cover, 801-Bearing space, 802-Fixed through hole, 9-Fixed bracket, 901-Threaded hole, 10-Locking bolt, 11-Sealing gasket, 12-Sealing ring, 13-Protective pipe, 14-Pile grouting pipe, 15-Isolation bracket, 16-Precision rolled hollow threaded steel bar structure, 17-Water-stop steel ring, 18-Pile grouting port, 19-Pipe seal, 20-Anchor steel mesh, 21-Sealing grouting material, 22-Epoxy resin, 23-Precision rolled anchor, 25-Secondary bearing body, 2501-Secondary bearing plate, 2502-Secondary locking nut, 2503-Upper connecting body, 2504-Lower connecting body, 2505-Grouting pipe perforation. Detailed Implementation

[0049] 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.

[0050] 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.

[0051] like Figures 1 to 3 As shown, a precision-rolled hollow threaded steel bar structure according to a preferred embodiment of the present invention includes a hollow structure and an external thread structure; the hollow structure is disposed inside the precision-rolled hollow threaded steel bar structure and is coaxially disposed with the precision-rolled hollow threaded steel bar structure; the external thread structure is disposed on the outer wall of the precision-rolled hollow threaded steel bar structure, and the external thread structure can be used to make smooth threaded connection or threaded locking with a matching internal thread structure.

[0052] In some embodiments, the precision-rolled hollow threaded steel bar structure also includes a first base circle diameter dh and a second base circle diameter dv. The first base circle diameter dh and the second base circle diameter dv may be equal or unequal. That is to say, the base circle may or may not be circular, for example, but not limited to, elliptical.

[0053] In some implementations, the external thread structure is set on the base circle, but the external thread structure is not a complete thread when viewed from the axial direction. Instead, a portion of the thread is cut off along both sides of the base circle axis, forming two symmetrical, planar structures on the surface of the outer wall of the precision rolled hollow threaded steel bar structure.

[0054] In some embodiments, the hollow structure includes a first inner diameter dr and a second inner diameter dl, both of which are smaller than the first base circle diameter dh and the second base circle diameter dv.

[0055] In some implementations, the first inner hole diameter dr and the second inner hole diameter dl may be equal or unequal. That is to say, the hollow structure is actually a central hole set along the central axis of the precision rolled hollow threaded steel bar structure. The central hole may or may not be circular, for example, but not limited to, elliptical.

[0056] In some embodiments, the nominal diameter of the precision-rolled hollow threaded steel bar structure of this embodiment is approximately between 15mm and 75mm, and the inner diameter is between 50% and 60% of the nominal diameter. However, this invention is not limited thereto, and the ratio between the inner diameter and the nominal diameter can be adjusted within a certain range according to actual needs. The above data can be found in standard GB / T20065-2016, but this invention is not limited thereto.

[0057] like Figures 4 to 8 As shown, an anchor bolt structure according to a preferred embodiment of the present invention includes a finely rolled hollow threaded steel bar structure 16, a tensioning and anchoring device, and a fixing and bearing device. The fixing and bearing device is located at the lower end of the finely rolled hollow threaded steel bar structure 16 and is used for anchoring the lower part of the anchor bolt structure. The tensioning and anchoring device is located at the upper end of the finely rolled hollow threaded steel bar structure 16 and is used for tensioning and locking the finely rolled hollow threaded steel bar structure 16. The finely rolled hollow threaded steel bar structure 16 is a hollow structure with both ends connected. An isolation structure is provided on the outside of the finely rolled hollow threaded steel bar structure 16, and a first annular structure is formed between the inner side of the isolation structure and the outer side of the finely rolled hollow threaded steel bar structure 16. The hollow structure and the first annular structure are connected at the lower part of the finely rolled hollow threaded steel bar structure 16 and isolated from the outside of the isolation structure, forming a secondary grouting backflow channel.

[0058] 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 precision-rolled hollow threaded steel bar structure 16 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 anchor bolt structures with prestress. However, for non-prestressed anchor bolt structures, the so-called primary and secondary grouting are merely different names and do 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.

[0059] like Figure 9 As shown, 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 forms a U-shaped channel in the entire anchor structure, which is connected in the lower part. The outlet and inlet are both in the upper part. The so-called outlet and inlet are only relative and theoretically can be interchanged. However, it is preferred to use the hollow opening in the upper part of the fine-rolled hollow threaded steel bar structure 16 as the inlet, which makes the installation of the grouting nozzle more convenient and simple.

[0060] 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 such as the anchor plate 1 of the tensioning anchoring device, commonly known as the tensioning anchoring end (generally provided in prestressed anchor bolt structures); the middle part mainly includes the isolation structure and its internal components such as the precision rolled hollow threaded steel bar structure 16, the isolation bracket 15, and the secondary bearing body 25; the lower part mainly includes the bearing plate 6 of the fixed bearing device and other fixing and locking components, commonly known as the bearing end.

[0061] In some embodiments, the fine-rolled hollow threaded steel bar structure 16 is a tubular hollow structure. The outer side of the fine-rolled hollow threaded steel bar structure 16 is provided with an external thread structure. The upper external thread structure is used to achieve fixation and tensioning with the tensioning and anchoring device. The lower external thread structure is used to achieve fixation with the fixed bearing device.

[0062] like Figures 10 to 12As shown, in some embodiments, the upper tensioning and anchoring device mainly includes an anchor plate 1 and a precision-rolled anchor 23. In this embodiment, the anchor plate 1 is a sinking anchor plate 1, but the present invention is not limited thereto. Various types of anchor plates 1 in the prior art can be applied to the present invention, or can be applied after simple modification. The anchor plate 1 includes a tensioning and locking space 101 inside, and the end of the precision-rolled hollow threaded steel bar structure 16 passes through the tensioning and locking space 101 from the lower part of the anchor plate 1. The precision-rolled anchor 23 is set in the tensioning and locking space 101. The precision-rolled anchor 23 applies prestress to the precision-rolled hollow threaded steel bar structure 16 through the external thread structure on the upper part of the precision-rolled hollow threaded steel bar structure 16. In this embodiment, the precision-rolled anchor 23 is actually a locking nut, which can match the external thread structure on the upper end of the precision-rolled hollow threaded steel bar structure 16.

[0063] In some embodiments, the anchor plate 1 further includes a reinforcing bar through hole 103 and a first flow channel 102; the reinforcing bar through hole 103 is located at the lower part of the anchor plate 1 and is coaxially connected with the tensioning and locking space 101, and the fine-rolled hollow threaded steel bar structure 16 enters the tensioning and locking space 101 after passing through the reinforcing bar through hole 103; the first flow channel 102 is located between the tensioning and locking space 101 and the reinforcing bar through hole 103; wherein the gap between the fine-rolled anchor 23 and the tensioning and locking space 101, the gap between the fine-rolled hollow threaded steel bar structure 16 and the reinforcing bar through hole 103, and the first flow channel 102 are connected to the first annular structure and constitute the upper channel of the secondary grouting backflow channel.

[0064] like Figures 13 to 15 As shown, in some embodiments, this example belongs to another type of anchor plate structure, the anchor plate 1 and Figures 10 to 12 The difference in the illustrated embodiment is that a side grouting hole 107 is provided on the anchor plate 1. The grouting method for the secondary grouting backflow channel can also include side grouting, grout return from the top of the hollow structure of the precision-rolled hollow threaded steel bar structure, grouting from the side grouting hole 107, and grout return from the top of the hollow structure; these are also grouting methods. Figure 16 The diagram shows the grouting and return flow direction of the upper channel of the secondary grouting backflow channel in this scheme's anchor structure.

[0065] Please see Figures 4 to 8 In some embodiments, the central isolation structure includes a hollow tube 3, 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 the pipe seal 19. The lower end of the hollow tube 3 is sealed to the upper part of the fixed bearing device. The middle part of the fine-rolled hollow threaded steel bar structure 16 is set inside the hollow tube 3. The outer side of the fine-rolled hollow threaded steel bar structure 16 and the inner side of the hollow tube 3 form a first annular structure.

[0066] In some implementations, the isolation structure is made of either metal or non-metal, and regardless of whether it is metal or non-metal, the isolation structure needs to be able to withstand a certain amount of pressure.

[0067] like Figures 16 to 23 As shown, in some embodiments, the lower fixed bearing device mainly includes a bearing plate 6, a precision rolled nut 7, and a sealing cover 8; the bearing plate 6 mainly includes a bearing disk 601 and a protective tube 602; the bearing disk 601 has a disk-shaped structure, and a bearing hole is provided on the bearing disk 601, the lower end of the precision rolled hollow threaded steel bar structure 16 is inserted into the bearing hole; the protective tube 602 is coaxially arranged with the bearing hole on the upper surface of the bearing plate 6, the protective tube 602 is sealed to the isolation structure, and the gap between the inner wall of the protective tube 602 and the precision rolled hollow threaded steel bar structure 16 is connected to the first annular structure; the precision rolled nut 7 and the precision rolled hollow The threaded steel bar structure 16 passes through the bearing hole and is connected by a second external thread. The top of the precision rolled nut 7 is provided with a second flow channel 701, which communicates with the gap between the precision rolled hollow threaded steel bar structure 16 and the inner wall of the bearing hole. The sealing cover 8 is sealed to the lower surface of the bearing plate 6, and the inner wall of the sealing cover 8 and the lower surface of the bearing plate 6 form a bearing space 801. The portion of the precision rolled hollow threaded steel bar structure 16 that passes through the bearing hole and the precision rolled nut 7 are covered in the bearing space 801. The bearing space 801 is connected to the hollow structure at the lower end of the precision rolled hollow threaded steel bar structure 16 and the second flow channel 701.

[0068] In some embodiments, the gap between the inner wall of the bearing space 801, the second flow channel 701, and the protective pipe 602 and the fine-rolled hollow threaded steel bar structure 16 constitutes the lower channel of the secondary grouting backflow channel. Figure 17 The black arrows in the diagram indicate the general direction of grouting within the second flow channel 701.

[0069] Please see Figures 22 to 23 In some embodiments, the lower fixed bearing device also includes a fixed bracket 9, which is fixedly connected to the lower end of the precision rolled nut 7. The fixed bracket 9 is provided with a threaded hole 901, and a locking bolt 10 is provided in the threaded hole 901.

[0070] Please see Figures 20 to 21 In some embodiments, the bottom of the sealing cover 8 is provided with a fixing through hole 802, the position of the fixing through hole 802 corresponds to the position of the threaded hole 901 of the fixing bracket 9, and the sealing cover 8 is fixed together with the precision rolled nut 7 and the bearing plate 6 by tightening bolts and nuts.

[0071] Please see Figure 17 In some embodiments, a sealing gasket 11 is provided between the fixing through hole 802 of the sealing cover 8 and the nut, and the sealing gasket 11 can seal the fixing through hole 802 from the outside.

[0072] Please see Figures 18 to 19 In some embodiments, an annular sealing groove 603 is provided on the ground on the side of the support plate 6 facing the sealing cover 8. A sealing ring 12 is provided in the sealing groove 603. During installation, the upper edge of the sealing cover 8 is embedded in the sealing groove 603 and the sealing ring 12 is squeezed to achieve a sealed connection between the sealing cover 8 and the support plate 6.

[0073] like Figures 24 to 28 As shown, in some embodiments, this embodiment is similar to... Figures 17 to 24 The difference in this embodiment lies in that the support plate 6 and a portion of the sealing cover 8 are integrated into a single structure. This integrated structure omits the sealing groove 603 and adds a sealing tube 604. A bolt passes through the connecting through hole 6051 of the sealing cover 605 and connects to the threaded hole 901 of the fixing bracket 9, thus fixing the sealing cover 605, the fixing bracket 9, and the integrated support plate 6 together. In fact, the sealing cover 605 and the sealing tube 604 of the support plate 6 can also adopt other connection methods, such as snap-fit ​​or threaded connection, etc., which are not limited in this invention. The integrated support plate 6 can be manufactured by, but is not limited to, casting, welding, or machining.

[0074] In some embodiments, the arrangement of the first flow channel 102 and the second flow channel 701 can take many forms, such as, but not limited to, the first flow channel 102 being arranged on the precision rolling anchor 23 and the second flow channel 701 being arranged on the bearing plate 6. Any structural form that can achieve communication with the central first annular structure can be used in this solution.

[0075] like Figures 29 to 30As shown, in some embodiments, the anchor structure of the present invention may further include one or more secondary bearing bodies 25. The structure of the secondary bearing body 25 is similar to that of the bearing plate 6. The secondary bearing body 25 includes a secondary bearing plate 2501, a secondary locking nut 2502, an upper connecting body 2503, a lower connecting body 2504, and a grouting pipe through hole 2505. The secondary bearing plate 2501 includes a secondary bearing hole through which the precision-rolled hollow threaded steel bar structure 16 passes. The secondary locking nut 2502 is connected to the second external thread in the middle of the precision-rolled hollow threaded steel bar structure 16 and abuts against the upper surface of the secondary bearing plate 2501. The lower end of the upper connecting body 2503 is connected to the secondary bearing plate 2501. The upper surface of the 01 is sealed and connected, and is arranged around the secondary bearing hole. The finely rolled hollow threaded steel bar structure 16 passes through the upper connecting body 2503, and the upper part of the upper connecting body 2503 is sealed and connected to the isolation structure. The upper end of the lower connecting body 2504 is sealed and connected to the lower surface of the secondary bearing plate 2501, and is arranged around the secondary bearing hole. The finely rolled hollow threaded steel bar structure 16 passes through the lower connecting body, and the lower part of the lower connecting body 2504 is sealed and connected to the isolation structure. The grouting pipe perforation 2505 is set on the secondary bearing plate 2501 and is located outside the upper connecting body 2503 and the lower connecting body 2504. The grouting pipe perforation 2505 is used for the installation of the pile grouting pipe 14.

[0076] In some implementations, the number of secondary bearing bodies 25 can be determined by the length of the overall anchor structure; longer structures require more, while shorter structures may not need to be. Furthermore, the grouting pipe perforation 2505 can be configured as a grouting pipe avoidance notch (not shown), which is more conducive to the installation of the pile grouting pipe. The installation of secondary bearing bodies 25 can increase the bonding between the middle position of the fine-rolled hollow threaded steel bar structure 16 and the concrete, and increase the load-bearing strength of the anchor structure.

[0077] According to a preferred embodiment of the present invention, a method for constructing an anchor bolt employs the aforementioned anchor bolt structure. The method 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 anti-corrosion protection for the components within the secondary grouting backflow channel.

[0078] 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.

[0079] 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.

[0080] In some implementations, secondary grouting involves injecting grout from the inlet of the secondary grouting return channel until the grout returns from the outlet.

[0081] In some implementations, secondary grouting involves injecting grout from the outlet of the secondary grouting return channel until the grout returns from the inlet.

[0082] In some implementations, secondary grouting requires injection from the inlet of the secondary grouting return channel under certain pressure conditions until grout returns from the outlet. Moreover, theoretically, the inlet and outlet of the secondary grouting return channel can be interchanged; however, it is preferred to use the upper opening of the hollow tube 3 as the injection inlet.

[0083] 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.

[0084] An anchor body formed by a construction method according to a preferred embodiment of the present invention, the construction method 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 primary grouting medium; and filling the secondary grouting return channel of the anchor structure with secondary grouting medium.

[0085] In some implementations, the primary grouting medium is cement mortar, and the secondary grouting medium is C40 grouting material.

[0086] 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, 20232 0767218.4, 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.

[0087] In summary, the high-strength hollow threaded steel bar structure and the anchor bolt structure containing this structure have the following advantages:

[0088] The hollow structure of the precision-rolled hollow threaded steel bar in this design can serve as part of the secondary grouting backflow channel. This allows it to perform the functions of ordinary precision-rolled threaded steel bars while reducing the manufacturing difficulty and cost of the anchor structure. Isolation devices are installed at the tensioning and anchoring ends, the load-bearing fixing ends, and the middle section of the precision-rolled hollow threaded steel bar structure. The inner side of the isolation device forms a first annular structure with the outer side of the precision-rolled hollow threaded steel bar structure. This first annular structure, together with the hollow structure of the precision-rolled hollow threaded steel bar structure, forms a secondary grouting backflow channel. Secondary grouting, injecting waterproof and / or anti-corrosion media, is performed through this channel. This seals the components within the isolation structure and provides corrosion protection for each component, giving the entire anchor body excellent water resistance and corrosion resistance.

[0089] 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 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.

[0090] Structural features:

[0091] 1. Install sealed metal or PE sheaths at the bearing end and anchoring end of the anchor bolt base material to give the anchor bolt base material a relatively independent space.

[0092] Function and purpose:

[0093] 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 there is no space for expansion and contraction. 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 through the gaps in the steel strand twisting.

[0094] 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 body. 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, inside the sleeve, and at 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.

[0095] 2. The anchor bolt bearing end adopts a sealed internal flow channel structure.

[0096] Function and purpose:

[0097] 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 / rock. 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 extrusion 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 provided 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.

[0098] 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.

[0099] 3. The anchoring end of the anchor bolt adopts a sinking structure.

[0100] Function and purpose:

[0101] 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 bearing end, due to the need for anchoring. Therefore, a leakage point appears at this connection. To prevent cracks in the base slab, a settling 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 is connected to the rod sheath to form an independent cavity. After tensioning, the tensioning and anchoring assembly is completely sealed and poured into the settling anchor plate 1 through high-pressure grouting at the anchor grouting hole. After the medium layer inside the cavity of the settling anchor plate 1 dries, the entire anchor structure assembly forms a sealed closed loop under the building surface layer.

[0102] 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.

Claims

1. An anchor structure comprising precision-rolled hollow threaded steel bars, characterized in that, The high-strength hollow threaded steel bar structure includes: A hollow structure is disposed within the high-strength rolled hollow threaded steel bar structure, and the hollow structure is coaxially arranged with the high-strength rolled hollow threaded steel bar structure; and An external thread structure is provided on the outer wall of the fine-rolled hollow threaded steel bar structure, and the external thread structure can be used to make threaded connections with a matching internal thread structure. The anchor structure includes the high-strength hollow threaded steel bar structure, the tensioning and anchoring device, and the fixed bearing device, wherein: The fixed bearing device is located at the lower end of the anchor structure and is used for anchoring the lower part of the anchor structure. The tensioning and anchoring device is located at the upper end of the anchor structure and is used for tensioning and locking the anchor structure. The fine-rolled hollow threaded steel bar structure is disposed between the tensioning anchoring device and the fixed bearing device; an isolation structure is provided on the outside of the fine-rolled hollow threaded steel bar structure, and a first annular structure is formed between the inner side of the isolation structure and the outer side of the fine-rolled hollow threaded steel bar structure. The hollow structure of the fine-rolled hollow threaded steel bar structure is connected to the first annular structure at the lower part of the fine-rolled hollow threaded steel bar structure. The internal space defined by the first annular structure and the hollow structure is isolated from the outside of the isolation structure, forming a secondary grouting backflow channel.

2. The anchor bolt structure comprising precision-rolled hollow threaded steel bars as described in claim 1, characterized in that, It also includes a first base circle diameter and a second base circle diameter, wherein the first base circle diameter and the second base circle diameter are not equal.

3. The anchor bolt structure comprising precision-rolled hollow threaded steel bars as described in claim 1, characterized in that, It also includes a first base circle diameter and a second base circle diameter, wherein the first base circle diameter and the second base circle diameter are equal.

4. The anchor bolt structure comprising precision-rolled hollow threaded steel bars as described in claim 2 or 3, characterized in that, The hollow structure includes a first inner diameter and a second inner diameter, both of which are smaller than the first base circle diameter and the second base circle diameter.

5. The anchor bolt structure comprising precision-rolled hollow threaded steel bars as described in claim 4, characterized in that, The diameter of the first inner hole and the diameter of the second inner hole are equal.

6. The anchor bolt structure comprising precision-rolled hollow threaded steel bars as described in claim 4, characterized in that, The diameters of the first inner hole and the second inner hole are not equal.

7. The anchor bolt structure comprising precision-rolled hollow threaded steel bars as described in claim 4, characterized in that, The ratio of the first inner hole diameter to the first base circle diameter and the ratio of the second inner hole diameter to the second base circle diameter are within a certain range.

8. The anchor bolt structure comprising precision-rolled hollow threaded steel bars as described in claim 1, characterized in that, The external thread structure at the upper end of the precision-rolled hollow threaded steel bar structure is used to achieve fixation and tensioning with the tensioning and anchoring device.

9. The anchor bolt structure comprising precision-rolled hollow threaded steel bars as described in claim 1, characterized in that, The external thread structure at the lower end of the precision-rolled hollow threaded steel bar structure is used to achieve fixation with the fixed bearing device.

10. The anchor bolt structure comprising precision-rolled hollow threaded steel bars as described in claim 1, characterized in that, The upper tensioning and anchoring device includes: An anchor plate, which is a settling anchor plate, includes a tensioning and locking space inside the anchor plate, and the end of the precision-rolled hollow threaded steel bar structure passes through the tensioning and locking space from the bottom of the anchor plate; and A precision-rolled anchor is disposed within the tensioning and locking space. The precision-rolled anchor applies prestress to the precision-rolled hollow threaded steel bar structure through the external thread structure at the upper end of the precision-rolled hollow threaded steel bar structure.

11. The anchor bolt structure comprising precision-rolled hollow threaded steel bars as described in claim 10, characterized in that, The anchor plate also includes: A reinforcing bar perforation is provided at the lower part of the anchor plate and coaxially communicates with the tensioning and locking space. The precision-rolled hollow threaded steel bar structure passes through the reinforcing bar perforation and enters the tensioning and locking space; and The first flow channel is disposed between the tensioning and locking space and the steel bar through hole; The gap between the precision-rolled anchor and the tensioning and locking space, the gap between the precision-rolled hollow threaded steel bar structure and the steel bar through hole, and the first flow channel are connected to the first annular structure, forming the upper channel of the secondary grouting backflow channel.

12. The anchor bolt structure comprising precision-rolled hollow threaded steel bars as described in claim 11, characterized in that, The isolation structure in the middle 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 fixed bearing device. The middle part of the fine-rolled hollow threaded steel bar structure is set inside the hollow tube. The outer side of the fine-rolled hollow threaded steel bar structure and the inner side of the hollow tube form the first annular structure and constitute the middle channel of the secondary grouting back discharge channel.

13. The anchor bolt structure comprising precision-rolled hollow threaded steel bars as described in claim 12, characterized in that, The lower fixed bearing device includes: A support plate includes: a support disc, which has a disc-shaped structure, the support disc including a support hole, the lower end of the finely rolled hollow threaded steel bar structure passing through the support hole; and a protective tube, which is coaxially disposed on the upper surface of the support disc with the support hole, the protective tube being sealed to the isolation structure, and the gap between the inner wall of the protective tube and the finely rolled hollow threaded steel bar structure communicating with the first annular structure; A precision-rolled nut, which is connected to the external thread structure of the precision-rolled hollow threaded steel bar structure passing through the bearing hole, wherein the top of the precision-rolled nut is provided with a second flow channel, the second flow channel communicating with the gap between the precision-rolled hollow threaded steel bar structure and the inner wall of the bearing hole; and A sealing cover is sealed to the lower surface of the bearing plate, and a bearing space is formed between the inner wall of the sealing cover and the lower surface of the bearing plate. The portion of the precision-rolled hollow threaded steel bar structure that passes through the bearing hole and the precision-rolled nut are sealed within the bearing space. The bearing space is connected to the hollow structure at the lower end of the precision-rolled hollow threaded steel bar structure and the second flow channel.

14. The anchor bolt structure comprising precision-rolled hollow threaded steel bars as described in claim 13, characterized in that, The bearing space, the second flow channel, and the gap between the inner wall of the protective pipe and the precision-rolled hollow threaded steel bar structure constitute the lower channel of the secondary grouting backflow channel.

15. The anchor bolt structure comprising precision-rolled hollow threaded steel bars as described in claim 1, characterized in that, It also includes a secondary support body, which is set in the middle of the fine-rolled hollow threaded steel bar structure. The upper and lower ends of the secondary support body are sealed to the isolation structure, and the gap between the inner side of the secondary support body and the outer side of the fine-rolled hollow threaded steel bar structure constitutes part of the middle channel of the secondary grouting back discharge channel.

16. The anchor bolt structure comprising precision-rolled hollow threaded steel bars as described in claim 15, characterized in that, The secondary load-bearing structure includes: A secondary bearing plate includes a secondary bearing hole through which the finely rolled hollow threaded steel bar structure passes; The secondary locking nut is connected to the external thread structure in the middle of the precision-rolled hollow threaded steel bar structure and abuts against the upper surface of the secondary bearing plate; An upper connecting body, the lower end of which is sealed to the upper surface of the secondary bearing plate and circumferentially arranged around the secondary bearing hole, the high-strength hollow threaded steel bar structure passing through the upper connecting body, and the upper part of the upper connecting body being sealed to the isolation structure; and The lower connecting body has its upper end sealed to the lower surface of the secondary bearing plate and is arranged around the secondary bearing hole. The high-strength hollow threaded steel bar structure passes through the lower connecting body, and the lower part of the lower connecting body is sealed to the isolation structure. The grouting pipe perforation is set on the secondary bearing plate and located outside the upper connecting body and the lower connecting body. The grouting pipe perforation is used for the installation of the pile grouting pipe.

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