Anti-floating anchor rod
By providing an expansion part and a sealing structure on the casing of the resistant anchor rod, the problems of casing cracks and groundwater seepage during tensioning are solved, and better anti-floating effect and construction reliability are achieved.
Patent Information
- Application Number
- CN202421879750.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-05
- Publication Date
- 2025-05-06
- Estimated Expiration
- 2034-08-05
AI Technical Summary
Existing anti-floating anchors are prone to cause casing to crack when tensioning, groundwater seepage leads to corrosion of steel bars, affecting the anti-floating effect.
A floating-resistant anchor rod is designed, and the corresponding parts of the connector on the sleeve are provided with an expansion part, which can buffer the expansion and contraction amount when the anchor rod is tensioned, avoid cracking the sleeve, and improve waterproof sealing performance through the sealing structure.
It effectively avoids casing cracks and groundwater seepage into corrosive steel bars, ensures anti-floating effect, and improves the safety and reliability of construction.
Smart Images
Figure CN222834888U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of anti-floating structures, in particular to an anti-floating anchor rod. Background Art
[0002] In recent years, underground space in building structures has been increasingly used, such as underground parking lots, underground supermarkets, etc. However, for building structures with relatively few floors above ground, the deadweight of the structure is not enough to resist the buoyancy of groundwater, which will cause problems such as floor bulge, cracking and leakage, and uneven settlement in the basement. For this reason, anti-floating structures are usually used to ensure the stability and safety of buildings and structures.
[0003] Compared with pull-out piles, anti-floating anchors have the advantages of convenient construction, high efficiency and low cost, and are becoming more and more common in anti-floating designs. Anti-floating anchors are usually designed with connectors to connect the prestressed steel anchor rod body. For prestressed anti-floating anchors, the anchor rod body is covered with a PE casing and filled with grease to prevent cement slurry from infiltrating and affecting the free expansion and contraction of the prestressed steel bars. However, due to the expansion and contraction of the anchor rod body when it is tensioned at the joint of the connector, it is easy to cause the casing to crack, and groundwater infiltration leads to steel bar corrosion, thus affecting the anti-floating effect. Utility Model Content
[0004] In view of the above-mentioned defects, the technical problem to be solved by the utility model is to provide an anti-floating anchor rod to solve the problem that the casing is easily cracked when the anchor rod is tensioned in the prior art, and groundwater seepage causes steel bar corrosion.
[0005] To this end, a first aspect of an embodiment of the present application provides an anti-floating anchor rod, comprising an anchor rod body, wherein the anchor rod body is formed by connecting a plurality of prestressed threaded steel bars through a connector, a lower anchor assembly is provided at the lower end of the anchor rod body, grease is applied on the outer circumferential surfaces of the anchor rod body and the connector, and a sleeve is provided on the outer sleeve, wherein the sleeve comprises:
[0006] Two first sleeves, wherein the diameter of the first sleeves is adapted to the anchor body;
[0007] a second sleeve having a diameter adapted to the connector;
[0008] Two reducing parts, both ends of the second sleeve are connected to the two first sleeves through the reducing parts respectively.
[0009] Based on the above technical solution, an enlarged part is provided at the position corresponding to the connector on the casing. When the anchor rod is tensioned, the expansion and contraction of the anchor rod at the connector joint can be absorbed and buffered by the enlarged part, so as not to tear the casing, thereby avoiding groundwater infiltration and corrosion of the steel bars, and ensuring the anti-floating effect.
[0010] In the above technical solution, preferably, the length of the second sleeve is greater than the length of the connector. In this implementation, the elongation during tensioning is reserved, which can prevent the connector from damaging the sleeve when tensioning the anchor rod.
[0011] In the above technical solution, preferably, the diameter reducing portion is connected to the first sleeve and the second sleeve by heat melting.
[0012] In the above technical solution, preferably, the joint is wrapped with butyl tape to ensure sealing and improve the strength of the joint.
[0013] In the above technical solution, preferably, the anchor rod body is a prestressed threaded steel bar.
[0014] In the above technical solution, preferably, the sleeve is made of PE material.
[0015] In the above technical solution, preferably, the lower anchor assembly includes an anchor, a metal carrier and a circular nut arranged in sequence from bottom to top, the circular nut is fixed to the lower end of the anchor body, a conical guide cap is provided below the metal carrier, the conical guide cap covers the lower end of the anchor and the anchor body, and the upper open end of the conical guide cap is fixed to the bottom surface of the metal carrier by spot welding, the lower end of the sleeve is sleeved on the outer circumference of the circular nut, the two are firmly bonded with sealant, then tightened with iron wire, and wrapped with butyl waterproof tape. In this implementation scheme, the lower end of the sleeve is sleeved on the outer circumference of the circular nut, the inner wall of the sleeve is in close contact with the circular nut, and then by applying sealant, tightening with iron wire, and wrapping with butyl waterproof tape, the waterproof sealing performance is effectively improved, and the bottom end of the PE sleeve can be prevented from entering slurry and water.
[0016] In the above technical solution, preferably, the metal carrier can adopt a disc structure or a rectangular plate structure, and the diameter of the circular nut is smaller than the diameter or side length of the metal carrier.
[0017] In the above technical solution, preferably, it also includes a cement slurry protection pipe, the outer diameter of which is adapted to the inner diameter of the borehole, the lower end of the cement slurry protection pipe is inserted into the borehole, and the upper end extends out of the borehole, and the position is maintained by suspension, and cement slurry is injected into the borehole through the cement slurry protection pipe.
[0018] In the above technical solution, preferably, the cement slurry protection pipe is made of PVC material, and the cement slurry protection pipe is two meters long, penetrates one meter below the raft and is exposed one meter.
[0019] It can be seen from the above technical solutions that the anti-floating anchor provided by the utility model solves the problem of casing cracking and steel bar corrosion caused by groundwater infiltration when the anchor is tensioned in the prior art. Compared with the prior art, the utility model has the following beneficial effects:
[0020] The traditional design of the existing anti-floating anchor rod using a casing of uniform diameter has been changed. An enlarged portion is provided on the casing at the position corresponding to the connector, which can buffer the expansion and contraction when the anchor rod is tensioned, avoid cracking the casing, prevent groundwater from seeping in and corroding the anchor rod body, and ensure the anti-floating effect. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the following will briefly introduce and illustrate the drawings required for use in the embodiments of the utility model or the description of the prior art. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0022] Figure 1 A schematic diagram of the anti-floating anchor provided by the utility model;
[0023] Figure 2 It is a schematic diagram of a position in which the sleeve corresponding to the connector in the utility model is provided with an enlarged portion;
[0024] Figure 3 It is a schematic diagram of the sealing structure of the carrier in the utility model;
[0025] Figure 4 It is a schematic diagram of the cement slurry integrity protection device at the anti-floating anchor pile head in the utility model.
[0026] Figure 1 In the figure, the corresponding relationship of the parts is as follows:
[0027] Connector 11, anchor body 10, sleeve 50;
[0028] A first sleeve 51 , a second sleeve 52 , and two diameter reducing portions 53 . DETAILED DESCRIPTION
[0029] The following will be combined with the drawings of the embodiments of the utility model to clearly and completely describe the technical solutions of the embodiments of the utility model. Obviously, the embodiments described below are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0030] In order to more clearly explain and illustrate the technical solution and implementation of the present utility model, several preferred specific embodiments for implementing the technical solution of the present utility model are introduced below.
[0031] It should be noted that the directional words such as "inside, outside", "front, back" and "left, right" in this article are expressed based on the product usage status. Obviously, the use of the corresponding directional words does not constitute a limitation on the protection scope of this scheme.
[0032] like Figure 1 As shown, the utility model provides an anti-floating anchor rod, including an anchor rod body 10, a lower anchor assembly 20 is provided at the lower end of the anchor rod body 10, an upper anchor assembly 30 is provided at the upper end, and the upper anchor assembly 30 is buried in the foundation bottom plate 40. The anchor rod body 10 is tensioned by using the lower anchor assembly 20 and the upper anchor assembly 30.
[0033] The outer surface of the anchor rod body 10 is coated with grease and is covered with a sleeve 50, which is made of PE. The anchor rod body 10 covered with the sleeve 50 is arranged in the borehole 60, and a plurality of positioning frames 70 are arranged along the length direction. The positioning frames 70 are pressed against the inner wall of the borehole 60 to achieve positioning. Cement slurry is poured between the sleeve 50 and the inner wall of the borehole 60, thereby forming an anti-floating anchor rod.
[0034] like Figure 2 As shown, the anchor body 10 is formed by connecting a plurality of prestressed threaded steel bars through a connector 11. The sleeve 50 forms an enlarged portion at the connector 11, including two first sleeves 51, a second sleeve 52 and two diameter reducing portions 53, and the second sleeve 52 is connected to the first sleeve 51 through the diameter reducing portions 53. In actual construction, the diameter reducing portion 53 is connected to the first sleeve 51 and the second sleeve 52 by heat melting, and the joint is wrapped with two turns of butyl tape.
[0035] The diameter of the first sleeve 51 matches the anchor body 10, the diameter of the second sleeve 52 matches the connector 11, and the length of the second sleeve 52 is greater than the length of the connector 11, leaving room for elongation during tensioning. For example, the outer end of the reducer 53 is 5 cm longer than the end face of the connector 11.
[0036] The present application scheme changes the design structure of the traditional anti-floating anchor rod using a casing of uniform diameter, and provides an enlarged portion at the position of the casing corresponding to the connector, which can buffer the expansion and contraction amount when the anchor rod is tensioned, avoid cracking the casing, prevent groundwater from seeping into and corroding the anchor rod body, and ensure the anti-floating effect.
[0037] In practical applications, the lower end of prestressed anti-floating anchor rods is usually provided with anchors and metal bearing bodies, the lower end of the metal bearing body is provided with a conical guide cap, the outer surface of the prestressed anti-floating anchor rod is coated with grease, and a PE sleeve is provided, and the bottom end of the PE sleeve is wrapped with waterproof tape to achieve free expansion and contraction of the prestressed steel bar during tensioning. However, the method of wrapping the bottom end of the PE sleeve with waterproof tape has poor reliability, and slurry and water often enter the bottom end of the PE pipe during construction, affecting the tensioning performance of the anti-floating anchor rod.
[0038] To this end, the present application scheme designs a carrier sealing structure, such as Figure 3 As shown, the lower anchor assembly 40 includes an anchor 41, a metal carrier 42 and a circular nut 43 arranged in sequence from bottom to top, and the circular nut 43 is fixed to the anchor rod body 10. A conical guide cap 44 is provided below the metal carrier 42, and the conical guide cap 44 covers the lower ends of the anchor 41 and the anchor rod body 10, and the upper open end is fixed to the bottom surface of the metal carrier 42 by spot welding.
[0039] The metal carrier 42 may be a disc structure or a rectangular plate structure, and the diameter of the circular nut 43 is smaller than the diameter or side length of the metal carrier 42 .
[0040] The anchor 41, the metal carrier 42 and the circular nut 43 are fixed to each other by spot welding, so that the anchor 41, the metal carrier 42, the circular nut 43 and the conical guide cap 44 are fixed into an integral structure.
[0041] The lower end of the sleeve 50 is sleeved on the outer circumferential surface of the circular nut 43, and the two are firmly bonded with a sealant, and then tightened with a wire and wrapped with two turns of butyl waterproof tape.
[0042] In the present application, a circular nut 43 is provided on the anchor body above the metal carrier 42, and the lower end of the sleeve 50 is sleeved on the outer circumferential surface of the circular nut 43, which changes the conventional method of directly winding the lower end of the sleeve 50 around the threaded steel bar. The inner wall of the sleeve 50 is in close contact with the circular nut 43, and the waterproof sealing performance is effectively improved by applying sealant, tightening the iron wire, and winding the butyl waterproof tape, which can prevent the occurrence of slurry and water ingress at the bottom of the PE sleeve.
[0043] Anchor tensioning is an important process in the construction of anti-floating anchors. Before tensioning, the anchor body at the end of the anchor should be chiseled to a dense position, and after removing the floating dust or mud on the reinforcement, the polymer cement waterproof mortar should be used to level it to the top elevation required by the design. However, in actual construction, chiseling the cement slurry at the pile head can easily cause the cement slurry to crack, the pile head surface is incomplete, and the performance of the anti-floating anchor is reduced.
[0044] To this end, the present application scheme designs a cement slurry integrity protection device at the anti-floating anchor pile head. Figure 4As shown, a cement slurry protection pipe 80 is inserted into the upper end of the borehole 60, the lower end of the cement slurry protection pipe 80 is inserted into the borehole 60, and the upper end extends out of the borehole 60. The cement slurry protection pipe 80 is made of PVC material, and the outer diameter is adapted to the inner diameter of the borehole 60. The cement slurry protection pipe 80 is suspended to ensure that the cement slurry protection pipe 80 does not move up and down, and cement slurry is injected into the borehole 60 through the cement slurry protection pipe 80.
[0045] After the anti-floating anchor is drilled, before lowering the anchor, the cement slurry protection pipe 80 is first lowered along the wall of the drilled hole to the specified height. The cement slurry protection pipe 80 is two meters long, one meter deep below the raft, and one meter exposed. The cement slurry protection pipe 80 is suspended to ensure that it does not move up and down. The cement slurry is injected into the cement slurry protection pipe 80, and the groove is cleaned after final setting. After the groove is cleaned and the chiseling elevation is measured and placed, the cement slurry protection pipe 80 is first cut in the ring before chiseling. This can effectively prevent the incomplete surface of the pile head caused by the collapse of the cement slurry during the chiseling process, which not only protects the integrity of the slurry facade but also ensures the flatness of the surface.
[0046] Based on the description of the above specific embodiments, the anti-floating anchor provided by the utility model has the following advantages compared with the prior art:
[0047] First, an expansion part is provided at the position corresponding to the connector on the casing. When the anchor rod is tensioned, the reducing part can be expanded and contracted. The expansion and contraction of the anchor rod at the connector joint can be absorbed and buffered by the expansion part, so as not to tear the casing, thereby avoiding groundwater infiltration and corrosion of the steel bars, and ensuring the anti-floating effect.
[0048] Second, the reducer is connected to the first sleeve and the second sleeve by heat melting, and the joint is wrapped with butyl tape twice to ensure sealing; at the same time, the strength of the joint is improved.
[0049] Third, the lower end of the casing is sleeved on the outer circumference of the circular nut, which changes the practice of directly wrapping the lower end of the traditional casing around the threaded steel bar. The inner wall of the casing is in close contact with the circular nut, and then by applying sealant, tightening the iron wire, and wrapping with butyl waterproof tape, the waterproof sealing performance is effectively improved, which can prevent slurry and water from entering the bottom of the PE casing.
[0050] Fourth, the cement slurry at the pile head is protected by a cement slurry protection pipe to prevent the cement slurry from forming irregular shapes. After the cement slurry has finally set, the cement slurry protection pipe is cut in a ring and then chiseled out, which reduces the workload of chiseling, improves work efficiency, and effectively ensures the integrity of the slurry facade.
[0051] Finally, it should be noted that the terms "comprises", "includes" or any other variants thereof as used herein are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the phrase "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.
[0052] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone should be aware of the structural changes made under the inspiration of the present invention. All technical solutions that are the same or similar to the present invention fall within the protection scope of the present invention.
Claims
1. An anti-floating anchor rod, comprising an anchor rod body, wherein the anchor rod body is formed by connecting a plurality of prestressed threaded steel bars through a connector, a lower anchor assembly is provided at the lower end of the anchor rod body, grease is applied on the outer circumferential surfaces of the anchor rod body and the connector, and a sleeve is provided on the outer cover, characterized in that: The sleeve comprises: Two first sleeves, wherein the diameter of the first sleeves is adapted to the anchor body; a second sleeve having a diameter adapted to the connector; Two reducing parts, both ends of the second sleeve are connected to the two first sleeves through the reducing parts respectively.
2. The anti-floating anchor rod according to claim 1, characterized in that: The length of the second sleeve is greater than the length of the connector.
3. The anti-floating anchor rod according to claim 1, characterized in that: The diameter reducing portion is connected to the first sleeve and the second sleeve by thermal melting.
4. The anti-floating anchor rod according to claim 3, characterized in that: The joints between the reducer and the first sleeve and the second sleeve are wrapped with butyl tape.
5. The anti-floating anchor rod according to claim 1, characterized in that: The anchor rod body is a prestressed threaded steel bar.
6. The anti-floating anchor rod according to claim 1, characterized in that: The sleeve is made of PE material.
7. The anti-floating anchor rod according to claim 1, characterized in that: The lower anchor assembly includes an anchor, a metal carrier and a circular nut which are arranged in sequence from bottom to top. The circular nut is fixed to the lower end of the anchor rod body. A conical guide cap is provided below the metal carrier. The conical guide cap covers the anchor and the lower end of the anchor rod body, and the upper open end of the conical guide cap is spot welded to the bottom surface of the metal carrier. The lower end of the sleeve is sleeved on the outer circumferential surface of the circular nut. The two are firmly bonded with sealant, tightened with wire, and wrapped with butyl waterproof tape.
8. The anti-floating anchor rod according to claim 7, characterized in that: The metal carrier adopts a disc structure or a rectangular plate structure, and the diameter of the circular nut is smaller than the diameter or side length of the metal carrier.
9. The anti-floating anchor rod according to claim 1, characterized in that: It also includes a cement slurry protection pipe, the outer diameter of which is adapted to the inner diameter of the borehole. The lower end of the cement slurry protection pipe is inserted into the borehole, and the upper end extends out of the borehole. The position is maintained by suspension, and cement slurry is injected into the borehole through the cement slurry protection pipe.
10. The anti-floating anchor rod according to claim 9, characterized in that: The cement slurry protection pipe is made of PVC material. The cement slurry protection pipe is two meters long, penetrates one meter below the raft plate, and is exposed one meter.