Prefabricated universal end caps for anti-buoyancy anchors and construction methods for anti-buoyancy anchors.

Abstract

This invention discloses a prefabricated universal end cap for anti-buoyancy anchors and a construction method for the anchors. When the borehole diameter increases, the variable diameter blade opens outward so that its end fits against the borehole wall; when the borehole diameter decreases, the variable diameter blade retracts inward toward the center of the reinforcing cylinder so that its end fits against the borehole wall, ensuring that the center of the reinforcing cylinder always coincides with the center of the borehole. The variable diameter blade can adapt well to changes in borehole diameter at different depths through its own buckling deformation, ensuring that its end fits against the borehole wall, thereby guaranteeing that the center of the reinforcing cylinder always coincides with the center of the borehole, significantly improving alignment quality and preventing jamming, thus increasing construction efficiency. Furthermore, this end cap is compatible not only with the construction of threaded steel bar anti-buoyancy anchors but also with the construction of steel strand anti-buoyancy anchors, demonstrating strong versatility and reducing construction costs.

Description

Technical Field

[0001] This invention relates to a prefabricated universal end cap for anti-buoyancy anchors and a construction method for anti-buoyancy anchors. Background Technology

[0002] Anti-buoyancy anchors are an important means of solving the problem of uplift in underground engineering projects, and their construction quality is directly related to the anti-buoyancy stability of underground engineering projects.

[0003] A crucial aspect of ensuring the quality of anti-buoyancy anchor bolt construction is guaranteeing the anchor bolt's alignment within the borehole. This ensures sufficient adhesion between the bolt and the grout, prioritizing the bond strength between them. Simultaneously, it prevents the longer portion of the bolt's base from embedding into the sediment at the bottom of the borehole, which could lead to incomplete grouting and bonding failure. Therefore, how to quickly, efficiently, and conveniently position the anti-buoyancy anchor bolt effectively in the center of the borehole without penetrating the sediment at the bottom has become a critical technical challenge that urgently needs to be addressed.

[0004] Chinese invention patent application number 202210947050.5, entitled "A Prefabricated Anti-buoyancy Anchor," includes one or more threaded steel bars and an anchoring mechanism, a centering bracket, a limiting bearing body, and a closed bearing body sleeved around the threaded steel bars. Several centering brackets and several limiting bearing bodies are alternately distributed between the anchoring mechanism and the closed bearing body. The anchoring mechanism is located at the end of the threaded steel bar and is fixed within a concrete base slab. The centering brackets, limiting bearing bodies, and closed bearing bodies are fixed within a grouting body. Both the limiting bearing bodies and the closed bearing bodies are threadedly connected to the threaded steel bars. Although this prefabricated anti-buoyancy anchor can improve the pull-out bearing capacity of the anchor, its combination with... Figure 1 and Figure 7 It can be seen that the enclosed support structure is lowered directly to the bottom of the borehole, with the fixing disc and auxiliary blades made of rigid materials. However, the diameter of the borehole may not be exactly the same at different depths, which can easily cause the enclosed support structure to get stuck during the lowering process, reducing construction efficiency. Furthermore, as... Figure 8 As shown, the bottom section of the closed-type bearing body is right-angled, which can easily cause difficulties during the drilling process. Furthermore, this closed-type bearing body can only be used with threaded steel bar anti-buoyancy anchors. When steel strand anti-buoyancy anchors are used, a corresponding closed-type bearing body is required for assembly, resulting in poor compatibility and high construction costs. Summary of the Invention

[0005] This invention provides a prefabricated universal end cap for anti-buoyancy anchors and a construction method for the anti-buoyancy anchors, which overcomes the shortcomings of the prior art. One of the technical solutions adopted by this invention to solve its technical problem is:

[0006] A prefabricated universal end cap for anti-buoyancy anchors, including threaded steel bar anti-buoyancy anchors and steel strand anti-buoyancy anchors, is provided. The prefabricated universal end cap includes a spherical cap body and several smoothly connected, symmetrically spaced variable-diameter blades on the outer periphery of the spherical cap body. The spherical cap body has a steel bar cylinder with an open top at its center. The spherical cap body also has several anchor cable cylinders arranged in a ring around the steel bar cylinder with open tops. The bottom end of the threaded steel bar anti-buoyancy anchor is fixedly connected to the steel bar cylinder, and the bottom end of the steel strand anti-buoyancy anchor is fixedly connected to the anchor cable cylinder.

[0007] During the process of lowering the end cap connected to the threaded steel bar anti-buoyancy anchor rod or steel strand anti-buoyancy anchor rod into the borehole, the spherical cap body moves smoothly downward along the borehole wall, and the variable diameter blade can move according to the diameter of the borehole at different depths:

[0008] When the borehole diameter increases, the variable diameter blades open outward so that their ends fit against the borehole wall, ensuring that the center of the reinforcing cylinder always coincides with the center of the borehole.

[0009] When the borehole diameter decreases, the reducing blade retracts inward toward the center of the reinforcing bar cylinder so that its end fits against the borehole wall, ensuring that the center of the reinforcing bar cylinder always coincides with the center of the borehole.

[0010] In a preferred embodiment, a rib is provided between the outer wall of the anchor cable cylinder and the inner side of the variable diameter blade.

[0011] In a preferred embodiment: the inner wall of the reinforcing bar cylinder is provided with a first internal thread, and the threaded reinforcing bar anti-buoyancy anchor rod is provided with a first external thread. The threaded reinforcing bar anti-buoyancy anchor rod and the reinforcing bar cylinder are fixed by the screw connection between the first external thread and the first internal thread.

[0012] In a preferred embodiment: the end cap further includes a locking ring and a clamping ring. The bottom end face of the steel strand anti-buoyancy anchor rod abuts against the inner bottom surface of the anchor tube. The clamping ring is sleeved on the outer periphery of the bottom end of the steel strand anti-buoyancy anchor rod, and its bottom end face abuts against the inner bottom surface of the anchor tube. The locking ring is tightly sleeved on the outer periphery of the clamping ring and has a second external thread. The inner wall of the anchor tube has a second internal thread. The locking ring and the anchor tube are fixed by the screw engagement of the second external thread and the second internal thread, thereby fixing the steel strand anti-buoyancy anchor rod relative to the anchor tube.

[0013] In a preferred embodiment: the clamping ring is provided with a first insertion hole, the bottom end of the steel strand anti-buoyancy anchor rod is inserted into the first insertion hole, the outer circumferential surface of the clamping ring is a conical shape with a smaller top and a larger bottom, the locking ring is provided with a second insertion hole, the inner wall of the second insertion hole includes a straight wall surface and a conical wall surface arranged vertically, the conical wall surface fits against the outer circumferential surface of the clamping ring, and the lower the locking ring is screwed, the greater the clamping force between the locking ring and the clamping ring.

[0014] In a preferred embodiment: the locking ring includes an upper ring body and a lower ring body, the second insertion hole passes through the upper ring body and the lower ring body, the outer peripheral surface of the upper ring body is polygonal, and the outer peripheral surface of the lower ring body is provided with the second external thread.

[0015] In a preferred embodiment: the clamping ring is formed by a plurality of clamping pieces, the plurality of clamping pieces forming the first insertion hole, and the outer periphery of the plurality of clamping pieces forming the conical shape.

[0016] In a preferred embodiment: the number of variable diameter blades and anchor cable cylinders are the same and correspond one-to-one.

[0017] The second technical solution adopted by this invention to solve its technical problem is:

[0018] The construction method for anti-buoyancy anchor bolts utilizes the prefabricated universal end caps of the aforementioned anti-buoyancy anchor bolts. The anti-buoyancy anchor bolts are made of threaded steel bars. The construction method includes:

[0019] Step 10: Align the bottom end of the threaded steel bar anti-buoyancy anchor with the steel bar cylinder, and firmly fix the bottom end of the threaded steel bar anti-buoyancy anchor to the steel bar cylinder so that the threaded steel bar anti-buoyancy anchor is in the center of the end cap;

[0020] Step 20: Align the bottom of the end cap with the threaded steel anti-buoyancy anchor rod with the drill hole, and lower the end cap to the bottom of the drill hole. During the process of lowering to the bottom of the drill hole, the spherical cap moves smoothly downward along the drill hole wall. The variable diameter blade can move according to the diameter of the drill hole at different depths. No matter whether the diameter of the drill hole increases or decreases, the variable diameter blade can open outward or retract inward toward the center of the steel cylinder so that its end fits against the drill hole wall, thereby ensuring that the center of the steel cylinder always coincides with the center of the drill hole.

[0021] Step 30: Grout into the borehole to complete the construction of the threaded steel anti-buoyancy anchor.

[0022] The third technical solution adopted by this invention to solve its technical problem is:

[0023] The construction method for anti-buoyancy anchor bolts utilizes the prefabricated universal end caps of the aforementioned anti-buoyancy anchor bolts. The anti-buoyancy anchor bolts are made of steel strand. The construction method includes:

[0024] Step 10: First, slip the locking ring onto the outer circumference of the steel strand anti-buoyancy anchor rod from the bottom end of the steel strand anti-buoyancy anchor rod, keeping it a certain distance from the bottom end face of the steel strand anti-buoyancy anchor rod. Then, place the clamping ring on the outer circumference of the bottom end of the steel strand anti-buoyancy anchor rod, close to the bottom end face of the steel strand anti-buoyancy anchor rod. Next, insert the clamping ring and the bottom end of the steel strand anti-buoyancy anchor rod together into the anchor cable cylinder, so that the bottom end face of the clamping ring and the bottom end face of the steel strand anti-buoyancy anchor rod both abut against the bottom surface of the anchor cable cylinder. Then, rotate the locking ring downwards so that the conical wall surface fits against the outer circumference surface of the clamping ring, until the conical wall surface is tightly pressed against the outer circumference surface of the clamping ring, thus fixing the steel strand anti-buoyancy anchor rod and the anchor cable cylinder relative to each other.

[0025] Step 20: Align the bottom of the end cap with the steel strand anti-buoyancy anchor rod with the drill hole, and lower the end cap to the bottom of the drill hole. During the process of lowering to the bottom of the drill hole, the spherical cap moves smoothly downward along the drill hole wall. The variable diameter blade can move according to the diameter of the drill hole at different depths. No matter whether the diameter of the drill hole increases or decreases, the variable diameter blade can open outward or retract inward toward the center of the steel cylinder so that its end fits against the drill hole wall, thereby ensuring that the center of the steel cylinder always coincides with the center of the drill hole.

[0026] Step 30: Grout into the borehole to complete the construction of the steel strand anti-buoyancy anchor.

[0027] Compared with the prior art, this technical solution has the following advantages:

[0028] 1. The outer circumference of the spherical cap is spherical, ensuring smooth sliding against the borehole wall during lowering to the bottom of the borehole. This prevents jamming and ensures the bottom of the threaded rebar anchor rod does not pierce the sediment, thus avoiding adhesion between the rod and the grout and preventing engineering accidents due to insufficient pull-out bearing capacity. Furthermore, during borehole lowering, the variable-diameter blade can move according to the borehole diameter at different depths. Regardless of whether the borehole diameter increases or decreases, the variable-diameter blade can open outwards or retract inwards towards the center of the rebar cylinder. In other words, the variable-diameter blade can adapt well to changes in borehole diameter at different depths through its own buckling deformation, ensuring its end fits against the borehole wall. This guarantees that the center of the rebar cylinder always coincides with the center of the borehole, significantly improving alignment quality and preventing jamming, thereby increasing construction efficiency. Meanwhile, this end cap is not only compatible with the construction of threaded steel bar anti-buoyancy anchor bolts, but also with the construction of steel strand anti-buoyancy anchor bolts, which has strong compatibility and reduces construction costs.

[0029] 2. A rib is provided between the outer wall of the anchor cable cylinder and the inner side of the variable diameter blade, which can improve the connection strength of the end cap.

[0030] 3. The clamping ring and the locking ring are securely connected by the fit between the conical wall surface and the outer circumferential surface of the clamping ring.

[0031] 4. The outer circumference of the upper ring of the locking ring is polygonal, preferably hexagonal, to facilitate threaded connection with the anchor cable cylinder.

[0032] 5. The clamping ring is composed of several clamping plates. The clamping plates can fit tightly with the outer periphery of the steel strand anti-buoyancy anchor rod, which makes the connection between the clamping ring and the steel strand anti-buoyancy anchor rod more secure. Attached Figure Description

[0033] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0034] Figure 1 A top view schematic diagram of a prefabricated universal end cap for an anti-buoyancy anchor bolt according to a preferred embodiment is shown.

[0035] Figure 2 A bottom view schematic diagram of the assembled universal end cap of an anti-buoyancy anchor bolt according to a preferred embodiment is shown.

[0036] Figure 3 A cross-sectional schematic diagram of a prefabricated universal end cap for an anti-buoyancy anchor bolt according to a preferred embodiment is shown.

[0037] Figure 4 A side view schematic diagram of the assembled universal end cap of an anti-buoyancy anchor bolt according to a preferred embodiment is shown.

[0038] Figure 5 A side view of a lock ring according to a preferred embodiment is shown.

[0039] Figure 6 An axial cross-sectional view of a lock ring according to a preferred embodiment is shown.

[0040] Figure 7 It is illustrated Figure 6 A schematic diagram of the AA section.

[0041] Figure 8 It is illustrated Figure 6 BB cross-sectional diagram.

[0042] Figure 9 An axial cross-sectional schematic diagram of a preferred embodiment of the clamping ring is shown.

[0043] Figure 10 A cross-sectional view of the upper end of the clamping ring according to a preferred embodiment is shown.

[0044] Figure 11 A cross-sectional view of the lower end of the clamping ring according to a preferred embodiment is shown.

[0045] Figure 12 A schematic diagram illustrating the connection between the threaded steel bar anti-buoyancy anchor rod and the end cap of a preferred embodiment is shown.

[0046] Figure 13 A schematic diagram illustrating the connection between a steel strand anti-buoyancy anchor and an end cap according to a preferred embodiment is shown.

[0047] Explanation of reference numerals in the attached figures:

[0048] Threaded steel bar anti-buoyancy anchor 1; steel strand anti-buoyancy anchor 2;

[0049] 10 spherical cap, 20 variable diameter blade, 11 steel bar cylinder, 12 anchor cable cylinder, 30 rib plate, 40 locking ring, 50 clamping ring, 51 first insertion hole, 41 second insertion hole, 411 straight wall surface, 412 conical wall surface, 42 upper ring body, 43 lower ring body, 52 clamping piece. Detailed Implementation

[0050] Unless otherwise expressly defined, the use of terms such as "first," "second," or "third" in the claims, description, and accompanying drawings of this invention is for distinguishing different objects and not for describing a specific order.

[0051] Unless otherwise expressly defined, in the claims, description, and accompanying drawings of this invention, the use of directional terms such as "center," "lateral," "longitudinal," "horizontal," "vertical," "top," "bottom," "inner," "outer," "upper," "lower," "front," "rear," "left," "right," "clockwise," and "counterclockwise" to indicate orientation or positional relationships is based on the orientation and positional relationships shown in the accompanying drawings and is only for the convenience of describing the invention and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the specific scope of protection of this invention.

[0052] Unless otherwise expressly defined, the terms "fixed connection" or "fixed connection" used in the claims, description and drawings of this invention should be interpreted broadly, that is, any connection in which there is no displacement or relative rotation relationship between the two parties, including non-removable fixed connections, detachable fixed connections, integral connections and fixed connections through other devices or elements.

[0053] In the claims, description and accompanying drawings of this invention, the terms "comprising," "having," and variations thereof are used to mean "including but not limited to."

[0054] Please refer to Figures 1 to 13 A preferred embodiment of the assembled universal end cap for anti-buoyancy anchor bolts.

[0055] The anti-buoyancy anchor bolts include threaded steel bar anti-buoyancy anchor bolts 1 and steel strand anti-buoyancy anchor bolts 2. The prefabricated universal end cap can be used with both threaded steel bar anti-buoyancy anchor bolts 1 and steel strand anti-buoyancy anchor bolts 2. It should be noted that the end cap described below is the prefabricated universal end cap for the anti-buoyancy anchor bolts of this application.

[0056] The end cap includes a spherical cap body 10 and several variable-diameter blades 20 smoothly connected to the outer periphery of the spherical cap body 10 and arranged symmetrically at intervals. The spherical cap body 10 has a steel rebar cylinder 11 with an open top at its center. The spherical cap body 10 also has several anchor cable cylinders 12 arranged in a ring around the steel rebar cylinder 11 with open tops. The bottom end of the threaded steel rebar anti-buoyancy anchor rod 1 is fixedly connected to the steel rebar cylinder 11, and the bottom end of the steel strand anti-buoyancy anchor rod 2 is fixedly connected to the anchor cable cylinder 12. The anchor cable cylinder 1 is connected to the threaded steel rebar anti-buoyancy anchor rod 1 or the steel strand anti-buoyancy anchor rod 2. During the process of lowering the end cap of the floating anchor rod 2 into the borehole, the spherical cap 10 moves smoothly downward along the borehole wall. The variable diameter blade 20 can move according to the diameter of the borehole at different depths: when the borehole diameter increases, the variable diameter blade 20 opens outward so that its end fits against the borehole wall, ensuring that the center of the reinforcing steel cylinder 11 always coincides with the center of the borehole; when the borehole diameter decreases, the variable diameter blade 20 retracts inward toward the center of the reinforcing steel cylinder 10 so that its end fits against the borehole wall, ensuring that the center of the reinforcing steel cylinder 11 always coincides with the center of the borehole.

[0057] In this embodiment, a rib plate 30 is provided between the outer wall of the anchor cable cylinder 12 and the inner side of the variable diameter blade 20. For example... Figure 3 As shown, each rib 30 extends longitudinally, with one side attached and fixed to the inner surface of the variable diameter blade 20, and the other side attached and fixed to the outer circumferential surface of the anchor cable cylinder 12. The longitudinal cross-section of the rib 30 is approximately a right-angled triangle. The rib 30 can improve the connection strength of the end cap.

[0058] In this embodiment, the number of variable diameter blades 20 and anchor cable cylinders 12 are the same and correspond one-to-one. For example... Figure 1 As shown, there are four variable diameter blades 20, two of which are symmetrically arranged; there are also four anchor cable cylinders 12; and there are also four rib plates 30. Furthermore, the wall of each anchor cable cylinder 12 is connected to the wall of the reinforcing bar cylinder 11, which improves the strength of the end cap.

[0059] In this embodiment, as Figure 3 and Figure 12 As shown, the inner wall of the reinforcing bar cylinder 11 is provided with a first internal thread, and the threaded reinforcing bar anti-buoyancy anchor rod 1 is provided with a first external thread. The threaded external thread and the first internal thread are screwed together to fix the threaded reinforcing bar anti-buoyancy anchor rod 1 to the reinforcing bar cylinder 11. Since the reinforcing bar cylinder 11 is located at the center of the spherical cap 10, the threaded reinforcing bar anti-buoyancy anchor rod 1 is also located at the center of the spherical cap 10.

[0060] In this embodiment, the end cap also includes a locking ring 40 and a clamping ring 50. The bottom end face of the steel strand anti-buoyancy anchor rod 2 abuts against the inner bottom surface of the anchor cable cylinder 12. The clamping ring 50 is sleeved on the outer periphery of the bottom end of the steel strand anti-buoyancy anchor rod 2, and its bottom end face abuts against the inner bottom surface of the anchor cable cylinder 12. The locking ring 40 is tightly sleeved on the outer periphery of the clamping ring 50 and is provided with a second external thread. The inner wall of the anchor cable cylinder 12 is provided with a second internal thread. The locking ring 40 and the anchor cable cylinder 12 are fixed by the screw connection of the second external thread and the second internal thread, thereby fixing the steel strand anti-buoyancy anchor rod 2 relative to the anchor cable cylinder 12.

[0061] In this embodiment, the clamping ring 50 is provided with a first insertion hole 51, and the bottom end of the steel strand anti-buoyancy anchor rod 2 is inserted into the first insertion hole 51. The outer peripheral surface of the clamping ring 50 is a conical surface shape with a smaller top and a larger bottom. The locking ring 40 is provided with a second insertion hole 41. The inner wall of the second insertion hole 41 includes a straight wall surface 411 and a conical wall surface 412 arranged vertically. The conical wall surface 412 fits against the outer peripheral surface of the clamping ring 50. The lower the locking ring 40 is screwed, the greater the clamping force between the locking ring 40 and the clamping ring 50.

[0062] In this embodiment, the locking ring 40 includes an upper ring body 42 and a lower ring body 43. The second insertion hole 41 passes through the upper ring body 42 and the lower ring body 43. The outer peripheral surface of the upper ring body 42 is polygonal, and the outer peripheral surface of the lower ring body 43 is provided with the second external thread.

[0063] In this embodiment, as Figure 10 and Figure 11 As shown, the clamping ring 50 is formed by two clamping pieces 52 surrounding each other, with the two clamping pieces 52 forming the first insertion hole 51. The outer periphery of the two clamping pieces 52 is in the shape of a conical surface. Therefore, when the locking ring 40 rotates downwards, the two clamping pieces 52 can be tightly pressed against the outer periphery of the bottom end of the steel strand anti-buoyancy anchor rod 2 under the action of the locking ring 40, ensuring the stability of the steel strand anti-buoyancy anchor rod 2. If needed, the clamping ring 50 can also be made of an annular body, directly fitted onto the outer periphery of the bottom end of the steel strand anti-buoyancy anchor rod 2. The inner wall of the clamping ring 50 and the outer periphery of the steel strand anti-buoyancy anchor rod 2 are provided with a concave-convex structure to increase friction, thereby improving the stability of the steel strand anti-buoyancy anchor rod 2.

[0064] The construction method for anti-buoyancy anchor bolts utilizes the prefabricated universal end caps of the aforementioned anti-buoyancy anchor bolts. The anti-buoyancy anchor bolts are threaded steel anti-buoyancy anchor bolts 1. The construction method includes:

[0065] Step 10: Align the bottom end of the threaded steel bar anti-buoyancy anchor rod 1 with the steel bar cylinder 11, and firmly fix the bottom end of the threaded steel bar anti-buoyancy anchor rod 1 to the steel bar cylinder 11 so that the threaded steel bar anti-buoyancy anchor rod 1 is at the center of the end cap; In this embodiment, the bottom end of the threaded steel bar anti-buoyancy anchor rod 1 and the steel bar cylinder 11 are fixed by the screw connection of the first internal thread and the first external thread.

[0066] Step 20: Align the bottom of the end cap of the threaded steel anti-buoyancy anchor rod 1 with the drill hole, and lower the end cap to the bottom of the drill hole. During the process of lowering to the bottom of the drill hole, the spherical cap 10 moves smoothly downward along the drill hole wall. The variable diameter blade 20 can move according to the diameter of the drill hole at different depths. No matter whether the diameter of the drill hole increases or decreases, the variable diameter blade 20 can open outward or retract inward toward the center of the steel cylinder 11 so that its end fits against the drill hole wall, thereby ensuring that the center of the steel cylinder 11 always coincides with the center of the drill hole.

[0067] Step 30: Grout into the borehole to complete the construction of threaded steel anti-buoyancy anchor rod 1. (Refer to...) Figure 12 .

[0068] The construction method for anti-buoyancy anchor bolts utilizes the prefabricated universal end caps of the aforementioned anti-buoyancy anchor bolts. The anti-buoyancy anchor bolts are steel strand anti-buoyancy anchor bolts 2. The construction method includes:

[0069] Step 10: First, slip the locking ring 40 onto the outer circumference of the steel strand anti-buoyancy anchor rod 2 from its bottom end, keeping it a certain distance from the bottom surface of the steel strand anti-buoyancy anchor rod 2. Then, place the clamping ring 50 onto the outer circumference of the bottom end of the steel strand anti-buoyancy anchor rod 2, close to its bottom surface. Next, insert the clamping ring 50 and the bottom end of the steel strand anti-buoyancy anchor rod 2 together into the anchor cable cylinder 12, so that the bottom surface of the clamping ring 50 and the bottom surface of the steel strand anti-buoyancy anchor rod 2 both abut against the inner bottom surface of the anchor cable cylinder 12. Then, rotate the locking ring 40 downwards so that the conical wall surface 412 fits against the outer circumference surface of the clamping ring 50 until the conical wall surface 412 is tightly pressed against the outer circumference surface of the clamping ring 50, thus fixing the steel strand anti-buoyancy anchor rod 2 relative to the anchor cable cylinder 12. Figure 13 As shown.

[0070] Step 20: Align the bottom of the end cap of the steel strand anti-buoyancy anchor rod 2 with the borehole, and lower the end cap to the bottom of the borehole. During the process of lowering to the bottom of the borehole, the spherical cap 10 moves smoothly downward along the borehole wall. The variable diameter blade 20 can move according to the diameter of the borehole at different depths. No matter whether the borehole diameter increases or decreases, the variable diameter blade 20 can open outward or retract inward toward the center of the steel rebar cylinder 11 so that its end fits against the borehole wall, thereby ensuring that the center of the steel rebar cylinder 11 always coincides with the center of the borehole.

[0071] Step 30: Grout into the borehole to complete the construction of the steel strand anti-buoyancy anchor 2.

[0072] The above description is merely a preferred embodiment of the present invention, and therefore should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made in accordance with the scope of the patent and the contents of the specification should still fall within the scope of the present invention.

Claims

1. A prefabricated universal end cap for anti-buoyancy anchor bolts, the anti-buoyancy anchor bolts including threaded steel bar anti-buoyancy anchor bolts and steel strand anti-buoyancy anchor bolts, characterized in that: This prefabricated universal end cap includes a spherical cap body and several variable-diameter blades smoothly connected to the outer periphery of the spherical cap body and arranged symmetrically at intervals. The spherical cap body has a steel rebar cylinder with an open top at its center. The spherical cap body also has several anchor cable cylinders arranged in a ring around the steel rebar cylinder with an open top, with the steel rebar cylinder as the center. The bottom end of the threaded steel rebar anti-buoyancy anchor rod is fixedly connected to the steel rebar cylinder, and the bottom end of the steel strand anti-buoyancy anchor rod is fixedly connected to the anchor cable cylinder. During the process of lowering the end cap connected to the threaded steel bar anti-buoyancy anchor rod or steel strand anti-buoyancy anchor rod into the borehole, the spherical cap body moves smoothly downward along the borehole wall, and the variable diameter blade can move according to the diameter of the borehole at different depths: When the borehole diameter increases, the variable diameter blades open outward so that their ends fit against the borehole wall, ensuring that the center of the reinforcing cylinder always coincides with the center of the borehole. When the borehole diameter decreases, the reducing blade retracts inward toward the center of the reinforcing bar cylinder so that its end fits against the borehole wall, ensuring that the center of the reinforcing bar cylinder always coincides with the center of the borehole.

2. The assembled universal end cap for the anti-buoyancy anchor bolt according to claim 1, characterized in that: A rib is provided between the outer wall of the anchor cable cylinder and the inner side of the variable diameter blade.

3. The assembled universal end cap for the anti-buoyancy anchor bolt according to claim 1, characterized in that: The inner wall of the steel cylinder is provided with a first internal thread, and the threaded steel anti-buoyancy anchor rod is provided with a first external thread. The threaded steel anti-buoyancy anchor rod is fixed to the steel cylinder by the screw connection between the first external thread and the first internal thread.

4. The assembled universal end cap for the anti-buoyancy anchor bolt according to claim 1, characterized in that: The end cap also includes a locking ring and a clamping ring. The bottom end face of the steel strand anti-buoyancy anchor rod abuts against the bottom surface of the anchor cable cylinder. The clamping ring is sleeved on the outer periphery of the bottom end of the steel strand anti-buoyancy anchor rod, and its bottom end face abuts against the bottom surface of the anchor cable cylinder. The locking ring is tightly sleeved on the outer periphery of the clamping ring and has a second external thread. The inner wall of the anchor cable cylinder has a second internal thread. The locking ring and the anchor cable cylinder are fixed by the screw connection of the second external thread and the second internal thread, thereby fixing the steel strand anti-buoyancy anchor rod relative to the anchor cable cylinder.

5. The assembled universal end cap for the anti-buoyancy anchor bolt according to claim 4, characterized in that: The clamping ring is provided with a first insertion hole, and the bottom end of the steel strand anti-buoyancy anchor rod is inserted into the first insertion hole. The outer circumferential surface of the clamping ring is a conical shape with a smaller top and a larger bottom. The locking ring is provided with a second insertion hole. The inner wall of the second insertion hole includes a straight wall surface and a conical wall surface arranged vertically. The conical wall surface fits against the outer circumferential surface of the clamping ring. The lower the locking ring is screwed, the greater the clamping force between the locking ring and the clamping ring.

6. The assembled universal end cap for the anti-buoyancy anchor bolt according to claim 5, characterized in that: The locking ring includes an upper ring body and a lower ring body. The second insertion hole passes through the upper ring body and the lower ring body. The outer peripheral surface of the upper ring body is polygonal, and the outer peripheral surface of the lower ring body is provided with the second external thread.

7. The assembled universal end cap for the anti-buoyancy anchor bolt according to claim 5, characterized in that: The clamping ring is formed by several clamping pieces surrounding it, with the clamping pieces forming the first insertion hole, and the outer periphery of the clamping pieces forming the conical shape.

8. The assembled universal end cap for the anti-buoyancy anchor bolt according to claim 1, characterized in that: The number of variable diameter blades and anchor cable cylinders are the same and correspond one-to-one.

9. A construction method for anti-buoyancy anchor bolts, wherein the prefabricated universal end cap of the anti-buoyancy anchor bolt as described in any one of claims 1 to 8 is used, wherein... The anti-buoyancy anchor bolt adopts threaded steel bar anti-buoyancy anchor bolt, characterized in that: the construction method includes: Step 10: Align the bottom end of the threaded steel bar anti-buoyancy anchor with the steel bar cylinder, and firmly fix the bottom end of the threaded steel bar anti-buoyancy anchor to the steel bar cylinder so that the threaded steel bar anti-buoyancy anchor is in the center of the end cap; Step 20: Align the bottom of the end cap with the threaded steel anti-buoyancy anchor rod with the drill hole, and lower the end cap to the bottom of the drill hole. During the process of lowering to the bottom of the drill hole, the spherical cap moves smoothly downward along the drill hole wall. The variable diameter blade can move according to the diameter of the drill hole at different depths. No matter whether the diameter of the drill hole increases or decreases, the variable diameter blade can open outward or retract inward toward the center of the steel cylinder so that its end fits against the drill hole wall, thereby ensuring that the center of the steel cylinder always coincides with the center of the drill hole. Step 30: Grout into the borehole to complete the construction of the threaded steel anti-buoyancy anchor.

10. A construction method for anti-buoyancy anchor bolts, wherein the prefabricated universal end cap of the anti-buoyancy anchor bolt as described in any one of claims 5 to 8 is used, wherein... The anti-buoyancy anchor bolt adopts steel strand anti-buoyancy anchor bolt, characterized in that: the construction method includes: Step 10: First, slip the locking ring onto the outer circumference of the steel strand anti-buoyancy anchor rod from the bottom end of the steel strand anti-buoyancy anchor rod, keeping it a certain distance from the bottom end face of the steel strand anti-buoyancy anchor rod. Then, place the clamping ring on the outer circumference of the bottom end of the steel strand anti-buoyancy anchor rod, close to the bottom end face of the steel strand anti-buoyancy anchor rod. Next, insert the clamping ring and the bottom end of the steel strand anti-buoyancy anchor rod together into the anchor cable cylinder, so that the bottom end face of the clamping ring and the bottom end face of the steel strand anti-buoyancy anchor rod both abut against the bottom surface of the anchor cable cylinder. Then, rotate the locking ring downwards so that the conical wall surface fits against the outer circumference surface of the clamping ring, until the conical wall surface is tightly pressed against the outer circumference surface of the clamping ring, thus fixing the steel strand anti-buoyancy anchor rod and the anchor cable cylinder relative to each other. Step 20: Align the bottom of the end cap with the steel strand anti-buoyancy anchor rod with the drill hole, and lower the end cap to the bottom of the drill hole. During the process of lowering to the bottom of the drill hole, the spherical cap moves smoothly downward along the drill hole wall. The variable diameter blade can move according to the diameter of the drill hole at different depths. No matter whether the diameter of the drill hole increases or decreases, the variable diameter blade can open outward or retract inward toward the center of the steel cylinder so that its end fits against the drill hole wall, thereby ensuring that the center of the steel cylinder always coincides with the center of the drill hole. Step 30: Grout into the borehole to complete the construction of the steel strand anti-buoyancy anchor.

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