A polymer anti-buoyancy anchoring device and method

Abstract

This invention provides a polymer anti-buoyancy anchoring device and method, relating to the field of geotechnical anchoring technology. Addressing the current problems of poor synergistic stress distribution between polymer anchors and reinforced concrete structures, and the susceptibility of polymer anchors to failure, this invention utilizes a bending joint and a stabilizing sleeve to wrap and protect the outer anchoring section, thereby improving its bending resistance and reducing failures caused by offset stress during construction and use. The bending joint establishes a connection between the anchoring steel and the polymer anchor, enhancing the polymer anchor's pull-out resistance and achieving synergistic stress distribution with the reinforced concrete structure.

Description

Technical Field

[0001] This invention relates to the field of rock and soil anchoring technology, specifically to a polymer anti-buoyancy anchoring device and method. Background Technology

[0002] In the construction of urban underground spaces, the impact of groundwater buoyancy on structures cannot be ignored. Excessive buoyancy can damage the foundation slab of underground structures or even cause the entire underground building (structure) to float. This is especially true in coastal areas or areas with shallow groundwater levels, where the impact of groundwater is even greater during underground space development. If the design is unreasonable or the anchoring measures are inadequate, various engineering quality problems such as cracks in the basement floor slab, roof slab, and column bases can easily occur, resulting in huge economic losses and posing a serious threat to public safety.

[0003] Fiber-reinforced polymer (FRP) anchors have attracted much attention from engineers due to their high tensile strength, good insulation, and strong corrosion resistance, making them considered the best alternative to steel anchors. Basalt fiber-reinforced polymer (BFRP) anchors, in addition to inheriting the advantages of FRP anchors, offer even stronger resistance to alkali corrosion and are a clean, sustainable, and pollution-free material.

[0004] Unlike ordinary steel bars, basalt fiber reinforced polymer anchors have high tensile strength, but poor shear strength, making it difficult for them to form a stable connection with existing reinforced concrete structures, resulting in poor overall synergistic stress distribution. Although the connection strength between the anchor and concrete can be improved by adding cross-connection structures and roughening the anchor surface, its synergistic stress distribution still cannot meet the requirements for buoyancy resistance. During construction or use, if tilting occurs, the basalt fiber reinforced polymer anchor is prone to breakage and failure due to displacement stress, failing to meet the requirements for anti-buoyancy anchoring scenarios. Summary of the Invention

[0005] The purpose of this invention is to address the deficiencies of existing technologies by providing a polymer anti-buoyancy anchoring device and method. This involves using a bent joint and a stabilizing sleeve to cover and enclose the outer anchoring section of the anchor rod, thereby protecting the outer anchoring section and improving its bending resistance. This reduces failures caused by offset stress during construction and use. The bent joint establishes a connection between the anchoring steel bar and the polymer anchor rod, improving the pull-out resistance of the polymer anchor rod and achieving a synergistic effect with the reinforced concrete structure.

[0006] The first objective of this invention is to provide a polymer anti-buoyancy anchoring device, which adopts the following solution:

[0007] The system includes an anchor rod, with a bent joint and a stabilizing sleeve sequentially fitted around the anchor rod. The first section of the bent joint connects to and wraps around one end of the anchor rod, and the second section of the bent joint connects to the anchoring steel bar. Along the axial direction of the anchor rod, the end of the first section of the bent joint is attached to and connected to the end of the stabilizing sleeve. The bent joint and the stabilizing sleeve together wrap around the outer anchoring section of the anchor rod.

[0008] Furthermore, the first and second sections of the bent joint are continuous and arranged at an angle to each other along the axis. The first section includes blind holes distributed along the axis, which are sleeved on one end of the anchor rod.

[0009] Furthermore, adhesive is filled between the outer peripheral wall of the anchor rod and the inner peripheral wall of the blind hole, and between the end face of the anchor rod and the bottom surface of the blind hole, so as to wrap the end of the anchor rod through a bent joint.

[0010] Furthermore, the stabilizing sleeve includes a continuous straight section and a tapered section along the axial direction. Both the straight section and the tapered section are sleeved outside the anchor rod. The straight section is located between the tapered section and the curved joint. Along the axial direction away from the straight section, the outer circumferential diameter of the tapered section gradually increases.

[0011] Furthermore, the straight section of the stabilizing sleeve is filled with adhesive between itself and the outer peripheral wall of the anchor rod, and the tapered section has grouting holes and venting holes on its tapered surface.

[0012] Furthermore, a base plate is cast outside the outer anchoring section of the anchor rod, and the bending joint, anchoring steel bars, and stabilizing sleeve are all embedded in the base plate.

[0013] Furthermore, a cushion layer is arranged between the base plate and the soil layer below it, and a waterproof layer and a protective layer are laid between the cushion layer and the base plate in sequence. The waterproof layer and the protective layer extend to the outer circumference of the stabilizing sleeve to isolate the base plate and the soil layer.

[0014] Furthermore, an anchor plate and a fixing bracket are installed on the segment of the anchor rod that penetrates into the soil layer. The fixing bracket is annular and coaxially arranged with the anchor rod.

[0015] A second objective of the present invention is to provide a construction method utilizing the polymer anti-buoyancy anchoring device as described in the first objective, comprising:

[0016] Anchor hole positioning and drilling;

[0017] Anchor bolt installation and grouting;

[0018] Construct a base slab cushion layer, and install stabilizing sleeves, bent joints, and anchoring steel bars on the outer anchoring section of the anchor bolts;

[0019] Pour the base plate and cure it. Remove the mold after curing.

[0020] Furthermore, when installing the stabilizing sleeve and the bent joint, adhesive is filled between the stabilizing sleeve and the anchor rod, and between the bent joint and the anchor rod, to form a wrapping structure, and the bent joint and the stabilizing sleeve are fitted and connected.

[0021] Compared with the prior art, the advantages and positive effects of this invention are:

[0022] (1) To address the current issues of poor synergistic stress distribution between polymer anchors and reinforced concrete structures, and the tendency of polymer anchors to fail, a bending joint and a stabilizing sleeve are installed on the outer anchorage section of the anchor to protect the outer anchorage section, thereby improving its bending resistance and reducing failures caused by offset stress during construction and use. The bending joint establishes a connection between the anchoring steel bar and the polymer anchor, thereby improving the pull-out resistance of the polymer anchor and achieving the effect of synergistic stress distribution with the reinforced concrete structure.

[0023] (2) A bent joint is provided in the outer anchorage section of the anchor rod, which can tightly connect the metal reinforcement and the non-metal reinforcement. In the case of limited thickness of the underground structure bottom plate, the outer anchorage length of the anti-buoyancy anchor rod can be effectively increased to meet the outer anchorage length specified in the code, thereby improving the outer anchorage bearing capacity of the anti-buoyancy anchor rod and the overall performance of the anti-buoyancy structure system.

[0024] (3) A special waterproof stabilizing sleeve is installed at the end of the anchor rod body in the outer anchoring section and installed on the anchor rod body. On the one hand, it can fix the suspended anti-buoyancy anchor rod body during construction. On the other hand, it can play the role of centering the anchor rod body in rock strata. The construction is convenient. The funnel-shaped enlarged structure at the bottom of the waterproof stabilizing sleeve can increase the anchoring force between the anchor rod body and the anchor body, thereby improving the pull-out bearing capacity of the anti-buoyancy anchor rod. Attached Figure Description

[0025] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0026] Figure 1 This is a schematic diagram of the overall structure of the polymer anti-buoyancy anchoring device in Embodiment 1 or 2 of the present invention.

[0027] Figure 2 This is a schematic diagram of the structure of the stabilizing sleeve in Embodiment 1 or 2 of the present invention.

[0028] Figure 3 This is a schematic diagram of the bending joint in Embodiment 1 or 2 of the present invention.

[0029] Figure 4This is a schematic diagram of the structure of the anchor plate and the locking anchor bolt in Embodiment 1 or 2 of the present invention.

[0030] Figure 5 This is a schematic diagram showing the arrangement of the stabilizing sleeve, waterproof layer, and protective layer in Embodiment 1 or 2 of the present invention.

[0031] Figure 6 This is a schematic diagram of the fixed bracket in Embodiment 1 or 2 of the present invention.

[0032] Figure 7 This is a top view of the fixed bracket in Embodiment 1 or 2 of the present invention.

[0033] In the diagram, 1 is the construction hole, 2 is the anchor bolt, 3 is the expander, 4 is the fixing bracket, 5 is the padding layer, 6 is the base plate, 7 is the stabilizing sleeve, 8 is the bent joint, 9 is the anchoring steel bar, 10 is the grouting hole, 11 is the vent hole, 12 is the waterproof layer, 13 is the waterproof membrane, 14 is the protective layer, 15 is the locking anchor bolt, and 16 is the anchor plate. Detailed Implementation

[0034] Example 1

[0035] In a typical embodiment of the present invention, such as Figures 1-7 As shown, a polymer anti-buoyancy anchoring device is presented.

[0036] In this embodiment, a basalt fiber reinforced polymer anti-buoyancy anchor rod 2 is used as an example. In other embodiments, polymer anchor rods 2 made of other materials can be used. The anchor rod 2 is made of basalt fiber reinforced polymer (BFRP) anchor rod 2 with a fully threaded solid structure. It adopts a straight anchor type and is formed in one step by pultrusion, curing, and thread winding. The diameter is 28mm or 32mm, and it has high strength, corrosion resistance, and pull-out bearing capacity.

[0037] like Figure 1 As shown, the drilling hole 1 is formed using a long spiral rotary drilling method, resulting in an anchor hole diameter of 120mm to 300mm. The hole depth is determined according to design requirements, and is slightly greater than the anchoring length of the anchor rod 2 by approximately 0.5m. The drilling hole 11 provides sufficient construction space for the anchor rod 2 expander 3, which has a diameter of 90mm to 200mm, allowing the anchor rod 2 and the anchor rod 2 expander 3 to form a whole, providing sufficient pull-out bearing capacity. The specific dimensions are determined based on actual anti-buoyancy requirements and the needs of construction machinery, ensuring that the diameter of the anchor rod 2 expander 3 is smaller than the diameter of the drilling hole 1, and that the grouting slurry can freely pass through the gap between the anchor rod 2 expander 3 and the drilling hole 1.

[0038] like Figure 1The polymer anti-buoyancy anchoring device shown mainly includes an anchor rod 2, a bending joint 8, a stabilizing sleeve 7, a base plate 6, and an anchoring steel bar 9. The end of the anchor rod 2 is connected to the anchoring steel bar 9 through the bending joint 8. The axis of the anchoring steel bar 9 is set at an angle to the anchor rod 2. The bending joint 8 establishes a connection between the two, thereby connecting the non-metallic polymer anchor rod 2 and the metallic anchoring steel bar 9, and working together to improve the pull-out resistance of the anchor rod 2. At the same time, the bending joint 8 and the stabilizing sleeve 7 are both fitted around the outer ring of the outer anchoring section of the anchor rod 2, and can wrap and cover the entire outer anchoring section, reinforcing the outer anchoring section of the anchor rod 2 and improving its bending resistance to avoid breakage failure.

[0039] like Figure 5 As shown, a bent joint 8 and a stabilizing sleeve 7 are sequentially fitted around the anchor rod 2. The first section of the bent joint 8 connects to and wraps around one end of the anchor rod 2, and the second section of the bent joint 8 connects to the anchoring steel bar 9. The stabilizing sleeve 7 is located between the bent joint 8 and the soil layer at the location where the anchor rod 2 is placed. Along the axial direction of the anchor rod 2, the end of the first section of the bent joint 8 is attached to and connected to the end of the stabilizing sleeve 7 to form a cooperative force-bearing structure. The bent joint 8 and the stabilizing sleeve 7 together wrap around the outer anchoring section of the anchor rod 2.

[0040] Combination Figure 3 The bent joint 8 is a connector with a bent end in the middle, and its cross-section along the axis is H-shaped, such as... Figure 3 As shown, the bent joint 8 in this embodiment is a rigid joint. The first and second segments are continuous and arranged at an angle to each other along the axis, forming a structure with the upper part bent and the lower part vertical. The first segment includes blind holes distributed along the axis, through which it is fitted onto one end of the anchor rod 2. The first segment is located at the upper part and is welded to the anchoring steel bar 9; the second segment is located at the lower part, arranged on the anchor rod 2 above the stabilizing sleeve 7, and has the same length as the anchor rod 2 above the stabilizing sleeve 7.

[0041] In this embodiment, the angle between the axes of the first segment and the second segment is 90°, but it can also be configured to other angles, such as obtuse or acute angles.

[0042] A bent joint 8 is added to the outer anchoring section to ensure that the anchor rod 2 is tightly connected to the anchoring steel bar 9 at a 90° angle when the thickness of the base plate 6 is limited (the anchoring length is insufficient), thereby improving the shear resistance and pull-out bearing capacity of the anchoring device in the foundation base plate 6.

[0043] To ensure the strength of the connection, the wall thickness of the bent joint 8 is not less than 10mm. Adhesive is filled between the bent joint 8 and the free end of the anchor rod 2. In this embodiment, epoxy resin and expansion agent are selected as the adhesive for this position. Heating makes the bent joint 8 and the anchor rod 2 quickly and firmly bonded together. The heating temperature needs to be determined according to the actual safety and curing requirements.

[0044] It is understandable that expanding agent and epoxy resin are used as adhesives. At the same time, adhesive is filled between the outer peripheral wall of anchor rod 2 and the inner peripheral wall of blind hole, and between the end face of anchor rod 2 and the bottom surface of blind hole, so as to wrap the end of anchor rod 2 through bending joint 8. On the one hand, it can increase the coverage area of ​​adhesive and ensure its fit. On the other hand, the expanding agent can expand to a certain extent during bonding, thereby clamping anchor rod 2 and bending joint 8 tightly.

[0045] Combination Figure 2 , Figure 5 In this embodiment, the stabilizing sleeve 7 is a specially made waterproof structure. The stabilizing sleeve 7 includes a continuous straight section and a conical section along the axial direction. Both the straight section and the conical section are sleeved on the outside of the anchor rod 2. The straight section is located between the conical section and the bent joint 8. Along the axial direction away from the straight section, the outer circumferential diameter of the conical section gradually increases, thus forming a funnel-shaped structure.

[0046] like Figure 2 As shown, the upper straight section of the stabilizing sleeve 7 is a cylindrical tubular structure with a thickness of not less than 5 mm and a height of 40 mm; the lower conical section is a trumpet-shaped structure with a thickness that gradually increases from top to bottom. The bottom inner diameter is the same as the diameter of the construction hole 1, the outer diameter is 450 mm, and the height is 60 mm.

[0047] A stabilizing sleeve 7 is installed at the end of the anchor rod 2 in the outer anchoring section. This sleeve is then attached to the anchor rod 2. On one hand, it secures the suspended anti-buoyancy anchor rod 2 during construction. On the other hand, in rock formations, it serves to center the anchor rod 2. Construction is convenient. The funnel-shaped expansion structure at the bottom of the waterproof stabilizing sleeve 7 increases the anchoring force between the anchor rod 2 and the anchor body, thereby improving the pull-out bearing capacity of the anti-buoyancy anchor rod 2.

[0048] The material of the stabilizing sleeve 7 is the same as that of the anchor rod 2 body. It is sleeved on the free end of the anchor rod 2 body, and the anchor rod 2 body must extend at least 300mm above the stabilizing sleeve 7 for the bending joint 8 to connect.

[0049] The straight section of the stabilizing sleeve 7 is filled with adhesive between itself and the outer peripheral wall of the anchor rod 2. Grouting holes 10 and venting holes 11 are provided on the conical surface of the conical section. Specifically, the upper cylindrical tubular structure has rough surfaces both inside and out, and is tightly connected to the anchor rod 2 using epoxy resin and a curing agent, thus serving to fix the suspended anchor rod 2 during construction. The lower trumpet-shaped structure has grouting holes 10 and venting holes 11 at its top, facilitating uniform grouting of the anchor body.

[0050] The stabilizing sleeve 7 can increase the anchoring force of the overall anti-buoyancy structure and improve the pull-out force of the anti-buoyancy anchor 2. In rock strata, the stabilizing sleeve 7 can also serve as the centering element for the anchor 2, but in other soil strata, a fixing support 4 needs to be added to the free section of the anchor 2.

[0051] like Figure 1 , Figure 4 , Figure 6 and Figure 7 As shown, an anchor plate 16 and a fixing bracket 4 are installed on the segment of the anchor rod 2 that penetrates into the soil layer. The fixing bracket 4 is annular and coaxially arranged with the anchor rod 2.

[0052] Specifically, the anchor plate 16 is installed on the anchor rod 2 by tightening the anchor bolts 15 to form the expander 3, such as... Figure 4 As shown, the whole is shaped like a lotus flower, and the material is the same as that of the anchor rod 2. The anchor rod 2 and the expander 3 can be firmly locked to the anchor rod 2 body through the thread in the pre-reserved hole in the center of the anchor plate 16. Then, they are tightened and fixed by the upper and lower locking anchor bolts 15 to enhance the integrity of the two and improve the pull-out bearing capacity of the anti-buoyancy anchor rod 2.

[0053] The bottom anchor plate 16 increases the contact area between the anchor rod 2 and the anchor body, and improves the pull-out bearing capacity. Tightening the anchor bolts 15 ensures that the anchor plate 16 is firmly fixed at the predetermined depth. This effectively increases the contact area between the anchor rod 2 and the anchor body, enhances the bond strength between them, and improves the ultimate pull-out bearing capacity of the anti-buoyancy anchor rod 2. Simultaneously, the increased contact area between the anchor rod 2 and the anchor body effectively controls cracking of the anchor body in the inner anchoring section, improving the overall integrity of the anti-buoyancy anchor rod 2.

[0054] The fixing bracket 4 is made of the same material as the anchor rod 2, and is shaped like a disc with a pre-drilled thread inside a central hole, such as... Figure 6 As shown, this ensures that the anchor rod 2 is centered in the construction hole 1, and that the anti-buoyancy anchor rod 2 is subjected to axial force under the buoyancy of groundwater. The annular fixing bracket 4 can better facilitate the penetration of grouting from the grouting hole 10 into the construction hole 1. The fixing bracket 4 can be two or more, with a spacing of 1.5m to 2.0m.

[0055] In addition, a base plate 6 is poured outside the outer anchoring section of the anchor bolt 2, and the bending joint 8, anchoring steel bar 9, and stabilizing sleeve 7 are all embedded in the base plate 6; a cushion layer 5 is arranged between the base plate 6 and the soil layer below it, and a waterproof layer 12 and a protective layer 14 are laid between the cushion layer 5 and the base plate 6 in sequence. The waterproof layer 12 and the protective layer 14 extend to the outer circumference of the stabilizing sleeve 7 to isolate the base plate 6 and the soil layer.

[0056] The foundation slab 6's pad layer 5 is made of C15 plain concrete with a thickness of 70mm. The foundation slab 6 is a cast-in-place reinforced concrete slab. To prevent underground capillary water intrusion, a layer of cement-based penetrating crystalline waterproof coating is first laid from bottom to top at the foundation slab 6's pad layer 5, followed by a layer of self-adhesive waterproof membrane 13, forming a waterproof layer 12. Finally, a 30mm thick fine stone concrete layer 14 is poured as a protective layer, with the pouring height reaching the height of the enlarged head at the bottom of the specially made waterproof stabilizing sleeve 7. Figure 5As shown, based on the high corrosion resistance of basalt fiber reinforced polymer anchor bolt 2, another safety barrier is added, effectively improving the service life of the anti-buoyancy anchor bolt 2.

[0057] The connection between the cushion layer 5 and the superstructure is made of waterproof coating and waterproof membrane 13, which can effectively prevent capillary water in the soil from passing through the gap between the bottom of the waterproof stabilizing sleeve 7 and the grouting body. The process is simple, easy to operate, convenient and safe, and can achieve insulation.

[0058] Example 2

[0059] In another typical embodiment of the present invention, such as Figures 1-7 As shown, a construction method for a polymer anti-buoyancy anchoring device is presented.

[0060] The construction method using the polymer anti-buoyancy anchoring device as described in Example 1 includes:

[0061] 1. Anchor hole positioning:

[0062] The site for anchor hole positioning must be firm and flat, with sufficient load-bearing capacity. A total station is used for surveying and setting out. The drilling locations and depths of the anchor bolt 2 holes are determined through surveying and setting out, as well as elevation measurements of the construction site. After the hole locations are set out, the deviation must be less than 20mm, and the horizontal and vertical hole spacing errors of the anchor bolt 2 must not exceed 100mm.

[0063] 2. Construction of anti-buoyancy anchor bolt hole formation:

[0064] Before construction, three anchor rods 2 of the same geological soil layer and the same type of anti-buoyancy anchor rod 2 should be installed for basic on-site testing. After the test is passed, large-scale construction can begin. A long spiral rotary drilling method should be used. Before starting the machine, check that all parts of the drilling machine are complete, that screws are not loose, and that the drill rod and drill bit are undamaged. When starting the machine, run it idle for one to two minutes, carefully listening for any abnormal noises or disturbances. After starting, move the drilling machine according to the on-site layout, aligning the drill bit with the center of the hole. Ensure the drilling machine achieves the designed verticality. After positioning the drilling machine, perform horizontal correction, and then begin drilling. The hole depth should be confirmed on-site and should not be less than or more than 500mm beyond the designed length. After drilling, install the anchor rods 2 to the fixed depth, clean the hole, and rinse it thoroughly with clean water.

[0065] 3. Fabrication of anti-buoyancy anchor rod 2:

[0066] According to design requirements, the anchor bars are processed by pultrusion, curing, and thread winding in one step. Before fabrication, the anchor rod 2 should be treated with special anti-corrosion oil for rust removal and corrosion prevention. Fixed supports 4 are installed at intervals of 1.5m to 2.0m along the inner anchoring section of the anchor rod 2 to ensure that the anchor rod 2 is centered in the construction hole 1. An inner anchor rod 2 expander 3 is installed at the bottom of the anchor rod 2, and the anchor rod 2 and anchoring plate 16 are tightly connected by tightening anchor bolts 15. A stabilizing sleeve 7 is fitted onto the top of the anchor rod 2, and the two are firmly connected by heating epoxy resin and an expanding agent to a certain temperature. The overall height of the stabilizing sleeve 7 is 100mm, and its lower flared structure can fit tightly against the base plate 6 and padding layer 5 around the construction hole 1. The fabrication time of the anti-buoyancy anchor rod 2 should be coordinated with the hole drilling time as much as possible to reduce the time the anti-buoyancy anchor rod 2 is exposed to air. The fabrication and storage of the anchor rod 2 are carried out in a dedicated work shed at the construction site; and mechanical damage, media corrosion, and contamination are avoided during storage, handling, and placement.

[0067] 4. Anchor bolt 2 construction and grouting:

[0068] Use a drilling machine to lift anchor rod 2 and place it into construction hole 1. Take care to avoid twisting, bending, or component detachment during placement. Inject grout into construction hole 1 through grouting holes 10 on stabilizing sleeve 7. Cement grout can be used. After the first grouting, perform a second grouting, with a grouting pressure of not less than 2.0 MPa. The specific cement strength, water-cement ratio, and grouting pressure will be determined based on actual project requirements. After grouting, curing is required. The curing time should not be less than 3 days before subsequent construction can proceed. During the curing period, avoid arbitrarily striking the anchor rod or hanging heavy objects on it.

[0069] 5. Waterproofing construction of the base slab, layer 5 and above.

[0070] After grouting is completed, the foundation slab 6 and cushion layer 5 are constructed using C15 plain concrete, with a thickness of 70mm. Following this, a cement-based penetrating waterproof coating is applied. The exposed surface of the foundation slab 6 and cushion layer 5 is brushed with the cement-based penetrating crystalline waterproof coating, with a thickness of 0.5–0.7mm. The waterproof coating should be applied upwards from the bottom of the stabilizing sleeve 7, extending beyond the bottom enlarged head. See [reference needed]. Figure 5 Then, a layer of self-adhesive waterproof membrane 13 with a thickness of 1.5mm is laid, and a layer of fine stone concrete protective layer 14 with a height of 30mm is poured on top of the self-adhesive waterproof membrane 13.

[0071] 6. Construction of base plate 6:

[0072] After the foundation slab 6, cushion layer 5, and waterproof layer 12 are completed, the external anchorage section bend joint 8 is connected. The H-type joint is a rigid component with a bent upper part and a vertical lower part. The upper bent part is effectively connected to the anchoring steel bar 9 by welding, and the anchoring steel bar 9 is bent at 90°. The lower vertical section is connected by inserting epoxy resin into the gap between the two and heating it to a certain temperature to improve its adhesion. The heating temperature needs to be determined according to actual safety and curing requirements. After the above work is completed, the construction of foundation slab 6 can be carried out. First, the steel bars are tied by mechanical connection. When tying, attention should be paid to the connection between the foundation slab 6 steel bars and the anchoring steel bars 9. The lap length of the steel bars should meet the specification requirements according to the steel bar type. Then, the formwork is erected and the concrete of foundation slab 6 is poured. Curing should be carried out within 8 to 12 hours after normal pouring. Curing methods can be watering or covering with heat insulation. The curing time should not be less than 7 days. The specific curing time is determined according to the actual project needs.

[0073] The above-mentioned undescribed components are designed in accordance with the current national standard "Technical Specification for Anti-buoyancy Anchors" (YB / T 4659-2018), and the manufacturing process for the undescribed components shall be selected from the current standards or specifications.

[0074] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A polymer anti-floatation anchoring device, characterized by, The anchor rod is sequentially sleeved with a bending joint and a stabilizing sleeve outside. The first section of the bending joint is connected to and wrapped around one end of the anchor rod, and the second section of the bending joint is connected to the anchoring steel bar. Along the axial direction of the anchor rod, the end of the first section of the bending joint is attached to and connected to the end of the stabilizing sleeve, forming a cooperative stress. The bending joint and the stabilizing sleeve are both sleeved outside the outer anchoring section of the anchor rod, and the bending joint and the stabilizing sleeve jointly wrap and cover the entire outer anchoring section of the anchor rod, reinforcing the outer anchoring section of the anchor rod and improving the bending resistance of the outer anchoring section of the anchor rod to avoid breakage failure. The bending joint is a connecting piece with a curved end in the middle, and the cross section along the axis is H-shaped. The first section and the second section of the bending joint are continuous and arranged at an angle along the axis. The first section includes a blind hole distributed along the axis and sleeved outside one end of the anchor rod. The first section is located at the upper part and is welded together with the anchoring steel bar. The second section is located at the lower part and is arranged on the anchor rod above the stabilizing sleeve and is consistent with the length of the anchor rod above the stabilizing sleeve. The adhesive is filled between the outer peripheral wall of the anchor rod and the inner peripheral wall of the blind hole and between the end surface of the anchor rod and the bottom surface of the blind hole to wrap the end of the anchor rod through the bending joint. The adhesive is selected from epoxy resin and expanding agent, and the bending joint and the anchor rod are rapidly and firmly bonded together through heating. The stabilizing sleeve includes a continuous straight cylinder section and a conical cylinder section along the axial direction. The straight cylinder section and the conical cylinder section are both sleeved outside the anchor rod. The straight cylinder section is located between the conical cylinder section and the bending joint. Along the axial direction away from the straight cylinder section, the outer peripheral wall diameter of the conical cylinder section gradually increases. The upper straight cylinder section of the stabilizing sleeve is a cylindrical tubular structure with a thickness of not less than 5 mm and a height of 40 mm. The lower conical cylinder section is a horn-shaped structure with a gradually increasing thickness from top to bottom. The inner diameter of the bottom is the same as the diameter of the construction hole, and the outer diameter is 450 mm. The height is 60 mm. The stabilizing sleeve is filled with adhesive between the straight cylinder section and the outer peripheral wall of the anchor rod, and the conical surface of the conical cylinder section is provided with a grouting hole and a vent hole. The outer anchoring section of the anchor rod is externally poured with a bottom plate, and the bending joint, the anchoring steel bar, and the stabilizing sleeve are all embedded in the bottom plate. A cushion layer is arranged between the bottom plate and the soil layer below the bottom plate. A waterproof layer and a protective layer are sequentially laid between the cushion layer and the bottom plate. The waterproof layer and the protective layer extend to the outer peripheral surface of the stabilizing sleeve to isolate the bottom plate and the soil layer. An anchoring plate and a fixed support are installed on the section of the anchor rod inserted into the soil layer. The fixed support is annular and coaxially arranged with the anchor rod. The anchoring plate is installed on the anchor rod through a locking anchor bolt to form an expander. The anchoring plate is a lotus-shaped structure made of the same material as the anchor rod. The anchor rod and the expander are firmly locked through the threads in the central reserved hole of the anchoring plate and the anchor rod body. Then, the anchor rod and the expander are fixed by tightening the upper and lower locking anchor bolts. The diameter of the expander is smaller than the diameter of the construction hole, and the grouting slurry can freely pass through the gap between the expander and the construction hole. The fixed support is made of the same material as the anchor rod body and is a disc-shaped structure with threads in the central hole.

2. A method of constructing a polymer anti-float anchor device as claimed in claim 1, characterised in that, The steps include: Positioning and forming the anchor hole; Constructing the anchor rod and grouting; Laying the bottom plate cushion, installing the stabilizing sleeve, the bending joint, and the anchoring steel bar on the outer anchoring section of the anchor rod; Pouring the bottom plate and maintaining it. After the maintenance is completed, the formwork is removed.

3. The construction method according to claim 2, wherein When the stabilizing sleeve and the bending joint are installed, the adhesive is filled between the stabilizing sleeve and the anchor rod and between the bending joint and the anchor rod respectively to form a wrapping structure, and the bending joint is attached to and connected with the stabilizing sleeve.

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