Anticorrosive and impermeable anchor rod structure for new buildings

Abstract

The present invention discloses an anti-corrosion and anti-seepage anchor structure for new buildings, which includes multiple steel strands arranged in an anchor hole. The top of the anchor hole includes a cushion layer, a bottom plate and a surface layer from bottom to top; a tension end anchor assembly is arranged at the top ends of the multiple steel strands and is located in the bottom plate below the surface layer. The tension end anchor assembly includes a settlement type winged anchor backing plate, which is arranged at the top of the multiple steel strands and is located at the top surface of the bottom plate. The settlement type winged anchor backing plate has a cylindrical structure, and the cylindrical structure includes a cylinder head part, a cylinder body part and a cylinder tail part from top to bottom. Among them, the tension anchor of the tension end anchor assembly is arranged at the cylinder head part; a connecting pipe is sleeved outside the multiple steel strands, and the upper end of the connecting pipe is hermetically connected to the lower end of the cylinder tail part; a water-stop steel ring assembly is embedded in the bottom plate and the cushion layer at the same time, and the lower end of the connecting pipe extends into the water-stop steel ring assembly; a front anchor carrier assembly is arranged at the other ends of the multiple steel strands. It can solve the problem of upward seepage of underground foundation water.

Description

Technical Field

[0001] The present invention relates to an anti-corrosion and anti-seepage anchor rod structure for a new type of building. Background Art

[0002] With the world economy entering a stage of rapid development in the 21st century, especially the development speed of the Chinese economy leading the world, China has achieved unprecedented improvement in infrastructure construction mechanism and technological innovation. With the advent of the era of the country stimulating domestic demand to promote the great development of infrastructure, the pressure-type prestressed anti-floating anchor rod has established its important position in the field of building foundation engineering in terms of research and development, production, and application. Traditional anti-floating anchor rods are of two types: pressure type and tension type. The base material is ordinary threaded steel or precision rolled threaded steel, and some use steel strands. Due to the low requirements for the use standards of early anti-floating anchor rods, corresponding defects have gradually emerged, such as: low anchoring anti-pulling force, poor anti-disturbance stability, weak anti-corrosion and anti-seepage properties, etc., which have caused safety accidents such as shear fracture, dislocation, cracking, and leakage of building foundation bearing beams. Based on this, the country has issued JGJ476-2019 "Technical Standard for Anti-floating of Building Engineering", which puts forward corresponding requirements for the design of anchor rods, and makes technical requirements for the anti-pulling anchoring force, length, anti-corrosion, and anti-seepage of different types of anti-floating anchor rods in different strata.

[0003] Based on the huge market demand for anti-floating anchor rods and their belonging to the category of prestress technology, the main research contents and key technical directions are as follows:

[0004] 1. Improve the anchoring anti-pulling force and anti-disturbance stability of the prestressed anchor rod anchor body: In the design of the main structure of the anchor rod, the most commonly used and stable anchoring method in prestressed anchoring technology is adopted, that is, the extrusion sleeve is combined with the extrusion spring through the high-pressure extrusion and biting method. The rod body base material uses UPS-15.2-1860-JG / T161-2016 unbonded steel strands. Without considering the concrete strength of the pile body, the anchoring performance by extrusion form meets the requirements of ≥95% in GB / T14370-2015, which is more than twice the design requirement strength of the anchor rod. Using unbonded steel strands has a large anchoring anti-pulling force, good anti-disturbance stability under stress structure, and also solves the anti-corrosion problem of the bus bar.

[0005] 2. Solve the problem of leakage of underground foundation water through the cracks in the anchor rod structure body or the joint between the concrete and the structure body: In Clause 7.5.10 of the JGJ476-2019 standard, there are different requirements for the waterproof grade of the connection part between the anchor rod and the underground foundation structure body. There are three parts in the anchor rod structure where leakage occurs:

[0006] 1) The fixed end is the most important leakage point, because the outer protective layer (plastic sheath) of the steel strand needs to be removed at the extrusion sleeve and the steel strand, so an exposed leakage point is formed at the end, and groundwater will seep from the end steel strand seam and the surface of the steel strand.

[0007] 2) The second leakage point is the connection between the upper part of the anchor rod and the raft or bottom plate of the building foundation, that is, the "waterstop steel plate part" in the structural drawings. The leakage point here mainly occurs at the junction of the unbonded steel strand and the pile concrete. The leakage method is: underground foundation water rises along the cracks between the plastic jacket of the unbonded steel strand and the concrete through the corresponding water pressure.

[0008] 3) The third leakage location is at the top of the anchor rod: the anchoring location of the anchor plate and the anchor steel strand. The anchoring connection is similar to the fixed end, and the outer plastic layer of the unbonded steel strand also needs to remove the surface sheath due to anchoring needs, so a leakage point appears at this connection.

[0009] In order to meet the requirements for anchor anti-corrosion design in Clause 7.5.9 of the JGJ476-2019 standard, a design scheme that comprehensively considers leakage and anti-corrosion compatibility during the initial design planning of the anchor becomes the technical key.

[0010] When using Figure 1 After the design structure shown in the figure was constructed, it was found that a large number of anti-floating anchor piles had underground foundation water seeping along the steel strands after the concrete was poured on the bottom slab. The reasons are as follows:

[0011] 1. The main parent material of the anti-floating anchor rod [unbonded steel strand] surface PE protective pipe is damaged during the construction process. The underground foundation water will penetrate into the damaged port of the unbonded steel strand through the cracks in the pile foundation concrete and then seep up from the gaps caused by the twisting of the steel strands;

[0012] 2. The outer surface of the parent material [unbonded steel strand] PE protective pipe is smooth and has poor adhesion to concrete, causing gaps. Underground foundation water will also seep upward through the cracks.

[0013] like Figure 1 As shown, an anchor rod structure of the prior art mainly includes a sealing cover 1', a tensioning anchor 2', an anchor pad 3', a supporting steel bar 31', a water-swellable rubber 4', a spiral rib 5', a water-stop steel plate 6', an elbow steel bar 61' and a compression sleeve 7'. Figure 1The combined part of the installation position of the designed structural anchor backing plate [steel plate] and the upper plane of the bottom plate under the surface layer. The height of the anchor is 50 mm, plus the remaining 20 mm after the working clamping pieces and the steel strand are tensioned and locked, with a total height of 70 mm. The total height of the surface layer concrete pouring is 100 mm. Therefore, the thickness of the water stop on the upper part of the anchor rod is only 30 mm, which cannot solve the problem of water seepage from the underground foundation. Moreover, there is a lack of sealed connection between the anchor backing plate 3´ and the water stop steel plate 6´, and only the support steel bars 31´ and the elbow steel bars 61´ are relied on to strengthen the combination with the concrete at the anchor backing plate 3´ and the water stop steel plate 6´, and the degree of combination still does not fully meet the requirements.

[0014] The surface layer is the directly used surface layer of the underground layer. Once water seeps, it will directly affect the use of the underground layer. The 30-mm water seepage thickness also brings considerable difficulties to the subsequent water stop construction.

[0015] The information disclosed in this background art section is only intended to enhance the overall understanding of the present invention and should not be regarded as an admission or any form of implication that this information constitutes the prior art already known to those of ordinary skill in the art. Summary of the Invention

[0016] The object of the present invention is to provide an anti-corrosion and anti-seepage anchor rod structure for a new type of building, which can well solve the problem of water seepage along the steel strand from the underground foundation of the anti-floating anchor rod pile.

[0017] To achieve the above object, the present invention provides an anti-corrosion and anti-seepage anchor rod structure for a new type of building, including multiple steel strands, a tensioning end anchor assembly, a connecting pipe, a water stop steel ring assembly, and a pre-anchoring carrier assembly; the multiple steel strands are arranged in the anchor rod holes, and the top of the anchor rod holes includes a cushion layer, a bottom plate, and a surface layer from bottom to top; the tensioning end anchor assembly is arranged at the top ends of the multiple steel strands and is located in the bottom plate below the surface layer. The tensioning end anchor assembly includes a sunken winged anchor backing plate, which is arranged on the top of the multiple steel strands and is located at the top surface of the bottom plate. The sunken winged anchor backing plate has a cylindrical structure, and the cylindrical structure includes a cylinder head part, a cylinder body part, and a cylinder tail part from top to bottom. The tensioning anchor of the tensioning end anchor assembly is arranged at the cylinder head part; the connecting pipe is sleeved outside the multiple steel strands, and the upper end of the connecting pipe is hermetically connected to the lower end of the cylinder tail part; the water stop steel ring assembly is embedded in both the bottom plate and the cushion layer at the same time, and the lower end of the connecting pipe extends into the water stop steel ring assembly; the pre-anchoring carrier assembly is arranged at the other ends of the multiple steel strands.

[0018] In a preferred embodiment, the settlement type winged anchor backing plate further includes an inner hole portion and a plurality of reinforcing wing plates; the inner hole portion is coaxially arranged on the settlement type winged anchor backing plate, and the inner hole portion has a stepped hole structure corresponding to the barrel head portion, the barrel body portion and the barrel tail portion, and the internal dimensions of the stepped hole structure and the external dimensions of the barrel head portion, the barrel body portion and the barrel tail portion all gradually decrease from top to bottom, and both the exterior of the barrel body portion and the corresponding inner hole portion thereof have a taper; the plurality of reinforcing wing plates are uniformly distributed along the axis on the outer wall of the barrel tail portion, and the external dimension of the reinforcing wing plate is larger than the external dimension of the barrel tail portion, and the thickness of each reinforcing wing plate gradually thins from the root of the upper surface to the outer edge portion.

[0019] In a preferred embodiment, the settlement type winged anchor backing plate further includes a plurality of bottom plate reinforcing ribs and a plurality of wing plate reinforcing ribs; the plurality of bottom plate reinforcing ribs extend along the axial direction and are evenly distributed in a ring on the outer wall of the barrel body portion; the plurality of wing plate reinforcing ribs extend along the axial direction and are evenly distributed in a ring on the outer wall of the barrel tail portion and are located between two reinforcing wing plates.

[0020] In a preferred embodiment, the number of the plurality of bottom plate reinforcing ribs is the same as that of the plurality of wing plate reinforcing ribs, and each bottom plate reinforcing rib and an adjacent wing plate reinforcing rib thereof are deflected by an angle.

[0021] In a preferred embodiment, the tension end anchor assembly further includes a tensioning anchor. The tops of multiple steel strands are locked on the tensioning anchor through a plurality of working wedges. The tensioning anchor has a disc-shaped structure and includes a plurality of tapered through holes which are evenly distributed in a ring around the center of the tensioning anchor. The tensioning anchor is arranged in the corresponding part of the inner hole portion corresponding to the barrel body portion with the small ends of the plurality of tapered through holes facing the barrel tail portion.

[0022] Wherein the working wedge has a structure of a pair of semi-cone sleeves. The working wedge is internally provided with annular thread teeth and has a taper matching the tapered through hole on the outside. The pair of semi-cone sleeve structures of the working wedge are buckled at the top of the multiple steel strands after removing the outer protective layer, and at the same time, the working wedge is embedded in the tapered through hole. The upper ends of the multiple steel strands, the settlement type winged anchor backing plate, the tensioning anchor and the working wedge are fixedly connected together by the return tension of the steel strands themselves.

[0023] In a preferred embodiment, the tensioning end anchor assembly further includes a waterproof grouting material, an epoxy resin waterproof material, a foam sealant, and a common spiral rib; the waterproof grouting material is filled in the gap between the inner wall of the inner hole part and the outer wall of the tensioning anchor, inside the inner hole part, between the multiple steel strands in the connecting pipe, and between the outer wall of the connecting pipe and the inner wall of the water stop steel ring assembly; the epoxy resin waterproof material seals the opening at the uppermost end of the inner hole part; the foam sealant is filled between the outer wall of the upper end of the connecting pipe and the inner wall of the lower end of the inner hole part; the common spiral rib is wound around the outer walls of the barrel tail and the connecting pipe; wherein the outer PE sheaths of the multiple steel strands located inside the working wedge, inside the inner hole part, and in the upper part of the connecting pipe are removed.

[0024] In a preferred embodiment, the water stop steel ring assembly includes a barrel part and an annular body; the lower part of the connecting pipe extends into the interior of the barrel part, and the gap between the inner wall of the barrel part and the outer wall of the connecting pipe is filled with the waterproof grouting material; the annular body is fixedly sleeved and connected to the upper part of the outer wall of the barrel part; wherein the annular body is embedded between the bottom plate and the cushion layer.

[0025] In a preferred embodiment, the anti-corrosion and anti-seepage anchor structure for new buildings further includes a water stop ring end pressure pipe, multiple central restraint rings, and multiple isolation brackets; the water stop ring end pressure pipe is extrusion-mounted on the outer PE sheaths of each steel strand located inside the water stop steel ring assembly and exposed a certain distance below the water stop steel ring assembly; the multiple central restraint rings and the multiple isolation brackets are arranged at intervals on the multiple steel strands located between the water stop steel ring assembly and the front anchor bearing assembly.

[0026] In a preferred embodiment, the front anchor bearing assembly includes a guide frame restraint ring, a guide bracket, a central grouting pipe, a fixed end anchor seal cover, a protective medium, a fixed end anchor, a pressure pipe / extrusion spring, a bearing plate, a nut, a locking nut / fixed pressing plate, a gasket, an O-ring, a tapered sealing ring, and a locking nut / gasket.

[0027] In a preferred embodiment, the front anchor bearing assembly further includes a straight rib spiral rib, which is wound around the multiple steel strands exposed above the bearing plate.

[0028] Compared with the prior art, the anti-corrosion and anti-seepage anchor rod structure for new buildings of the present invention has the following beneficial effects: The sunken winged anchor backing plate of the present invention is made of HT250 gray iron or 45# steel. Under the relative acting force of the steel strand of the anchor, the bearing plate meets the requirements of bearing pressure and anti-disturbance under the support of concrete; the number of wing rings is increased or decreased according to the bearing capacity of the anchor backing plate under the calculation of bearing pressure and anti-disturbance ability under the support of concrete; because the sunken post-tensioning end anchor is used, the anchor backing plate is connected to the metal corrugated pipe to form a relatively independent cavity. After the tensioning and locking are completed, the tensioning end is waterproofed and sealed by filling with grouting material and epoxy resin waterproof material to form a closed loop; the metal corrugated pipe / metal seamless is connected to the lower opening of the sunken winged anchor backing plate, so that a cavity is formed inside the pipe and the sunken anchor backing plate from the cushion layer to prevent infiltration during the casting of the bottom slab concrete. After the cable anchor is tensioned and locked, C40 waterproof grouting material is injected into the cavity to form a water-sealing lock; the extrusion installation position of the pressure pipe includes the outer PE layer of the steel strand when pressing in the cushion layer and below, and the steel strand above the cushion layer needs to be degreased and removed the PE layer for pressing. Its main functions are: one is that the adhesion between the metal pressure pipe and the concrete is greater than the adhesion of the PE plastic, which can effectively solve the problem of the foundation water seeping around through the bonding crack between the PE pipe and the concrete; the other is that during the construction process, the steel strand is bent when it is at the upper end of the cushion layer. It is very difficult to straighten the bent steel strand, which causes difficulties in the construction of steel bar binding and anchor backing plate operation installation during the bottom slab pouring process, especially the installation construction of the anchor during tensioning; now, the bent steel strand with an outer pressure pipe can be easily straightened. The sunken anchor backing plate is cast with gray iron, and its surface is rough. With the setting of the reinforcing ribs and the alignment blocks, it can better adhere to the concrete and also solve the problem of the foundation water seeping around through the surface of the anchor backing plate. Through the sunken structure, the overall tensioning end anchor body descends and remains in the bottom slab layer to keep the surface layer thickness, changing the situation that the upper end surface of the anchor is within the surface layer in the past, and it is difficult to control the water seepage problem with only 2-3 cm space where the upper end surface of the anchor is ≤ 3 cm from the upper plane of the surface layer. The concrete of the surface layer has sufficient thickness and integrity, and its anti-seepage ability is guaranteed. The sunken structure form ensures the thickness of the surface layer in the anchor pile area and has stronger anti-seepage ability; the sunken structure form enables the tensioning end anchor body to form a complete closed loop for anti-corrosion and anti-seepage at the upper end of the anchor rod under the function of the relatively independent hole cavity, grouting material, sealing ring and sealing cover; the structural form and material of the sunken anchor backing plate in this design better solve the problem of surrounding seepage. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic structural diagram of an anti-corrosion and anti-seepage anchor rod structure according to an embodiment of the prior art;

[0030] Figure 2 is a schematic structural diagram of an anti-corrosion and anti-seepage anchor rod structure according to an embodiment of the present invention;

[0031] Figure 3Schematic diagram of the installation structure of the tension end anchor assembly and the water stop steel ring assembly according to an embodiment of the present invention;

[0032] Figure 4 is Figure 3 Partial enlarged schematic diagram at position I;

[0033] Figure 5 Front view sectional schematic diagram of the settlement type winged anchor backing plate according to an embodiment of the present invention;

[0034] Figure 6 Left view structural schematic diagram of the settlement type winged anchor backing plate according to an embodiment of the present invention;

[0035] Figure 7 Right view structural schematic diagram of the settlement type winged anchor backing plate according to an embodiment of the present invention;

[0036] Figure 8 Front view structural schematic diagram of the tension anchor according to an embodiment of the present invention;

[0037] Figure 9 Side view sectional structural schematic diagram of the tension anchor according to an embodiment of the present invention;

[0038] Figure 10 Front view combined structural schematic diagram of the working wedge according to an embodiment of the present invention;

[0039] Figure 11 Side view structural schematic diagram of the working wedge according to an embodiment of the present invention;

[0040] Figure 12 Cross-sectional structural schematic diagram of the connecting pipe according to an embodiment of the present invention;

[0041] Figure 13 Front view structural schematic diagram of the water stop steel ring assembly according to an embodiment of the present invention;

[0042] Figure 14 Side view sectional structural schematic diagram of the water stop steel ring assembly according to an embodiment of the present invention;

[0043] Figure 15 Front view structural schematic diagram of the isolation bracket according to an embodiment of the present invention;

[0044] Figure 16 Side view structural schematic diagram of the isolation bracket according to an embodiment of the present invention;

[0045] Figure 17 Schematic diagram of the structure of the front anchor bearing carrier assembly according to an embodiment of the present invention;

[0046] Figure 18 isFigure 16 Partial enlarged schematic view at position II;

[0047] Figure 19 Front view structural schematic diagram of a carrier plate according to an embodiment of the present invention;

[0048] Figure 20 Side view sectional structural schematic diagram of a carrier plate according to an embodiment of the present invention;

[0049] Figure 21 Sectional structural schematic diagram of a conical sealing ring according to an embodiment of the present invention;

[0050] Figure 22 Front view sectional schematic diagram of a fixed - end anchor seal cover according to an embodiment of the present invention;

[0051] Figure 23 Side view structural schematic diagram of a fixed - end anchor seal cover according to an embodiment of the present invention;

[0052] Figure 24 Front view structural schematic diagram of a fixed pressing plate according to an embodiment of the present invention;

[0053] Figure 25 Side view sectional schematic diagram of a fixed pressing plate according to an embodiment of the present invention;

[0054] Figure 26 Sectional structural schematic diagram of an extrusion sleeve according to an embodiment of the present invention;

[0055] Figure 27 Front view structural schematic diagram of a guiding bracket according to an embodiment of the present invention;

[0056] Figure 28 Side view structural schematic diagram of a guiding bracket according to an embodiment of the present invention.

[0057] Main reference numeral description:

[0058] 1 - Guide frame restraint ring, 2 - Guide support, 3 - Central grouting pipe, 4 - Fixed end anchor seal cover, 401 - Restraint hole, 5 - Protective medium, 6 - Fixed end anchor (extrusion sleeve / spring), 7 - Pressure pipe / extrusion spring, 8 - Bearing plate, 801 - Central tapered hole, 802 - Side tapered hole, 803 - Bolt through hole, 9 - Nut, 10 - Unbonded / slow-bonded steel strand, 11 - Locking nut / fixed pressure plate, 1101 - Grouting pipe hole, 1102 - Wire passing hole, 12 - Sealing gasket, 13 - O-ring, 14 - Conical sealing ring, 15 - Locking nut / gasket, 16 - Straight ribbed spiral bar, 17 - Central restraint ring, 18 - Isolation support, 19 - Waterstop steel ring assembly, 1901 - Cylindrical part, 1902 - Ring-shaped body, 20 - Waterstop ring end pressure pipe, 21 - Connecting pipe (metal corrugated pipe / metal seamless pipe), 22 - Settling winged anchor backing plate, 2201 - Cylindrical head part, 2202 - Cylindrical body part, 2203 - Cylindrical tail part, 2204 - Inner hole part, 2205 - Reinforcing wing plate, 2206 - Bottom plate reinforcing rib, 2207 - Wing plate reinforcing rib, 2208 - First mark, 2209 - Second mark, 2210 - Third mark, 23 - Tensioning anchor, 2301 - Tapered through hole, 24 - Working wedge, 2401 - Ring-shaped thread teeth, 25 - C40 waterproof grouting material, 26 - Epoxy resin waterproof material, 27 - Foam sealant, 28 - Ordinary spiral bar, 1´ - Seal cover, 2´ - Tensioning anchor, 3´ - Anchor backing plate, 31´ - Support steel bar, 4´ - Water swelling rubber, 5´ - Spiral bar, 6´ - Waterstop steel plate, 61´ - Bent steel bar, 7´ - Pressure sleeve pipe. Detailed implementation manners

[0059] The following combines the accompanying drawings to describe in detail the specific implementation manners of the present invention. However, it should be understood that the protection scope of the present invention is not limited by the specific implementation manners.

[0060] Unless otherwise clearly stated, throughout the specification and claims, the term "comprise" or its variations such as "comprises" or "including" etc. will be understood to include the stated elements or components, without excluding other elements or other components.

[0061] Such as Figures 2 to 7 And Figure 17As shown, a novel anti-corrosion and anti-seepage anchor rod structure for construction according to a preferred embodiment of the present invention mainly includes multiple steel strands 10, a tension end anchor assembly, a connecting pipe 21, a water-stop steel ring assembly 19, a front anchor carrier assembly, etc. The multiple steel strands 10 are arranged in the anchor rod hole, and the top of the anchor rod hole includes a cushion layer, a bottom plate, and a surface layer from bottom to top. The tension end anchor assembly is arranged at the top of the multiple steel strands 10 and is located in the bottom plate below the surface layer. The tension end anchor assembly includes a sunken winged anchor backing plate 22 arranged at the top of the multiple steel strands 10 and located at the top surface of the bottom plate. The sunken winged anchor backing plate 22 has a cylindrical structure, and the cylindrical structure includes a cylinder head 2201, a cylinder body 2202, and a cylinder tail 2203 from top to bottom. Among them, the cylinder head 2201 is embedded in the surface layer, and the cylinder body 2202 and the cylinder tail 2203 are embedded in the bottom plate. The connecting pipe 21 is sleeved outside the multiple steel strands 10, and the upper end of the connecting pipe 21 is hermetically connected to the lower end of the cylinder tail 2203. The water-stop steel ring assembly 19 is simultaneously embedded in the bottom plate and the cushion layer, and the lower end of the connecting pipe 21 extends into the water-stop steel ring assembly 19. The front anchor carrier assembly is arranged at the other end of the multiple steel strands 10 and is located at the bottom of the anchor rod hole.

[0062] Please refer to Figures 5 to 7 , in some embodiments, the sunken winged anchor backing plate 22 further includes an inner hole part 2204 and multiple strengthening wing plates 2205. The inner hole part 2204 is coaxially arranged on the central axis of the sunken winged anchor backing plate 22. The inner hole part 2204 has a stepped hole structure corresponding to the cylinder head 2201, the cylinder body 2202, and the cylinder tail 2203, and the size of the stepped hole structure and the outer dimensions of the cylinder head 2201, the cylinder body 2202, and the cylinder tail 2203 all gradually decrease from top to bottom. Moreover, the outer part of the cylinder body 2202 and the corresponding inner hole part 2204 both have a taper of about 2°. The multiple strengthening wing plates 2205 are uniformly distributed along the axis on the outer wall of the cylinder tail 2203, and the outer dimension of the strengthening wing plate 2205 is larger than the outer dimension of the cylinder tail 2203. The thickness of each strengthening wing plate 2205 gradually thins from the root of the upper surface to the outer edge part.

[0063] Please refer to Figures 5 to 7 , in some embodiments, the sunken winged anchor backing plate 22 further includes multiple bottom plate strengthening ribs 2206 and multiple wing plate strengthening ribs 2207. The multiple bottom plate strengthening ribs 2206 extend along the axial direction and are uniformly distributed in a ring on the outer wall of the cylinder body 2202. The multiple wing plate strengthening ribs 2207 extend along the axial direction and are uniformly distributed in a ring on the outer wall of the cylinder tail 2203 and are located between two strengthening wing plates 2205. The wing plate strengthening ribs 2207 can be set according to actual needs and the stress situation. If the stress is small, they can also be not set.

[0064] Please refer to Figure 6, in some embodiments, the number of multiple bottom plate stiffeners 2206 is the same as that of multiple wing plate stiffeners 2207, and each bottom plate stiffener 2206 and an adjacent wing plate stiffener 2207 are deflected by an angle. In this embodiment, four bottom plate stiffeners 2206 and four wing plate stiffeners 2207 are shown respectively, and each deflection angle is 45°, but the number and the deflection angle are not limited thereto.

[0065] Please refer to Figure 7 , in some embodiments, the sunken winged anchor backing plate 22 further includes a first mark 2208, a second mark 2209 and a third mark 2210, which can be arranged on the bottom edge of the inner hole part corresponding to the barrel head 2201, and the marks are all arranged in a centered circular shape. The marks can also be arranged on the bottom surface at the junction of the barrel head and the barrel body. The marks can be processed in forms such as direct casting and laser engraving.

[0066] In some embodiments, the cylindrical structure of the sunken winged anchor backing plate 22 in this embodiment is shown as a cylindrical structure, but the present invention is not limited thereto, and it can also be an elliptical cylindrical shape, a polygonal cylindrical shape, etc.

[0067] As Figures 8 to 11 shown and please refer to Figure 4 , in some embodiments, the tension end anchor assembly further includes a tension anchor 23. The tops of multiple steel strands 10 are locked on the tension anchor 23 through multiple working wedge-shaped jaws 24. The tension anchor 23 has a disc-shaped structure. The tension anchor 23 includes multiple tapered through holes 2301, and the tapered through holes 2301 are evenly distributed around the center of the tension anchor 23. The tension anchor 23 is arranged in the corresponding part of the inner hole part 2204 corresponding to the barrel body part 2202 with the small ends of the multiple tapered through holes 2301 facing the barrel tail 2203.

[0068] Among them, the working wedge-shaped jaw 24 has a pair of semi-conical sleeve structures. An annular threaded tooth 2401 is arranged inside the working wedge-shaped jaw 24, and the outside has a taper matching the tapered through hole 2301. The pair of semi-conical sleeve structures of the working wedge-shaped jaw 24 are buckled at the top of the multiple steel strands 10 where the outer protective layer is removed. At the same time, the working wedge-shaped jaw 24 is embedded in the tapered through hole 2301. The upper ends of the multiple steel strands 10, the sunken winged anchor backing plate 22, the tension anchor 23 and the working wedge-shaped jaw 24 are fixedly connected together through the return tension of the steel strands 10 themselves.

[0069] Please refer to Figures 2 to 4, in some embodiments, the tension end anchor assembly further includes a waterproof grouting material 25, an epoxy resin waterproof material 26, a foam sealant 27, and a common spiral reinforcement 28. The waterproof grouting material 25 is filled in the gap between the inner wall of the inner hole part 2204 and the outer wall of the tension anchor 23, inside the inner hole part 2204, between the multiple steel strands 10 inside the connecting pipe 21, and between the outer wall of the connecting pipe 21 and the inner wall of the water stop steel ring assembly 19. The waterproof grouting material 25 uses a C40 material. The epoxy resin waterproof material 26 is sealed at the uppermost opening of the inner hole part 2204, and the opening of the inner hole part 2204 is tightly sealed. The foam sealant 27 is filled between the outer wall of the upper end of the connecting pipe 21 and the inner wall of the lower end of the inner hole part 2204 to achieve a sealed connection at this location. The common spiral reinforcement 28 is wound around the outer walls of the barrel tail part 2203 and the connecting pipe 21. Among them, the outer PE sheaths of the multiple steel strands 10 located inside the working wedge 24, inside the inner hole part 2204, and in the upper part of the connecting pipe 21 are removed so that the steel strands 10 can be fully combined with the C40 waterproof grouting material 25. The technical solution of the present application can be applied to unbonded or slow-bonded steel strands 10.

[0070] As Figures 13 to 14 shown, in some embodiments, the water stop steel ring assembly 19 includes a cylindrical part 1901 and an annular body 1902. The lower part of the connecting pipe 21 extends into the interior of the cylindrical part 1901, and the gap between the inner wall of the cylindrical part 1901 and the outer wall of the connecting pipe 21 is filled with the waterproof grouting material 25. The annular body 1902 is fixedly sleeved and connected to the upper part of the outer wall of the cylindrical part 1901. A sealed connection is adopted between the cylindrical part 1901 and the annular body 1902, including for example but not limited to welding, etc. Among them, the annular body 1902 is embedded between the bottom plate and the cushion layer. The shape of the water stop steel ring assembly 19 includes various forms such as a cylindrical shape and a polygonal cylindrical shape.

[0071] As Figures 15 to 16 shown and referring to Figure 3, in some embodiments, the anti-corrosion and anti-seepage anchor structure for new buildings further includes a water-stop ring end pressure pipe 20, a plurality of central restraint rings 17 and a plurality of isolation brackets 18. The water-stop ring end pressure pipe 20 is extrusion-mounted on the outer PE sheath of each steel strand 10 inside the water-stop steel ring assembly 19 and a certain distance below the exposed water-stop steel ring assembly 19. The extrusion mounting position of the water-stop ring end pressure pipe 20 includes the outer PE sheath of the steel strand 10 during the pressing of the cushion layer and below, and the steel strand 10 above the cushion layer needs to be degreased and the outer PE sheath removed. Its main functions are as follows: First, the adhesion between the metal pressure pipe and the concrete is greater than that of the PE plastic, which can effectively solve the problem of the foundation water seeping around through the adhesion cracks between the PE pipe and the concrete; Second, during the construction process, when the steel strand 10 is at the upper end of the cushion layer, there is a phenomenon of bending. It is very difficult to straighten the steel strand 10 after bending, which causes difficulties in the operations of steel bar binding and anchor plate installation during the bottom slab pouring process, especially the installation construction of the anchor during tensioning. Now, with the outer pressure pipe on the steel strand 10, the bent steel strand 10 can be easily straightened. A plurality of central restraint rings 17 and a plurality of isolation brackets 18 are arranged at intervals on the multiple steel strands 10 between the water-stop steel ring assembly 19 and the pre-anchored carrier assembly.

[0072] In some embodiments, the combination of the central restraint ring 17 and the isolation bracket 18 of the steel strand 10 is used to increase the friction resistance of the steel strand 10 and improve the mechanical properties of the concrete structure. The isolation bracket 18 of the steel strand 10 ensures the uniform distribution of the installation of the steel strand 10, ensures the uniform stress of the stressed body, and at the same time forms friction resistance and mechanical properties in combination with the central restraint ring 17 of the steel strand 10.

[0073] Such as Figures 17 to 28As shown, in some embodiments, the front anchor bearing assembly includes a guide frame constraint ring 1, a guide bracket 2, a central grouting pipe 3, a fixed end anchor sealing cover 4, a protective medium 5, a fixed end anchor 6, a pressure pipe / extrusion spring 7, a bearing plate 8, a nut 9, a locking nut / fixed pressure plate 11, a sealing pad 12, an O-ring 13, a conical sealing ring 14, a locking nut / gasket 15 and a spiral rib 16 with straight ribs. The spiral rib 16 with straight ribs is wound around a plurality of steel strands 10 exposed on the upper part of the bearing plate 8. The fixing of the guide frame constraint ring 1 and the guide bracket 2 increases the guiding property. The guide bracket 2 plays a guiding and centering role, increases the pull-out resistance, and avoids the insufficient strength of the bearing end grouting body caused by the bottom hole sediment. The central grouting pipe 3 is used for high-pressure grouting. The sealing cover 4 of the fixed end anchor 6 is built-in for protection, and the sealing protection between the anchor structure of the fixed end anchor 6, the steel strand 10 / pressure sleeve, and the bearing body. The protective medium 5 is used to protect the built-in anchor structure assembly from rust and leakage. The fixed end anchor 6 includes an extrusion sleeve / spring (not shown), which is sleeved on each steel strand 10, and the extrusion sleeve is sleeved on the extrusion spring. The steel strand 10 and the anchor (extrusion sleeve / spring) are engaged with each other, and its pull-out resistance meets the requirements of GB / T14370-2015. The compression tube / extrusion spring 7 and the steel strand 10 are engaged with the bolt, and its pull-out resistance is ≥70KN, which ensures the need for additional anchoring of the bracket while meeting the convenience of processing and installation. The bearing plate 8 is the bearing plate 8 under the relative force of the steel strand 10, and the bearing plate 8 under the support of the grouting body meets the requirements of pressure bearing and anti-interference ability. The nut 9 and the connection between the bracket and the bearing plate 8 are fixed. The non-bonded / slowly bonded steel strand 10 is the connection carrier between the fixed end under the anchor and the structural end on the anchor, and is also the carrier of the bidirectional force. The locking nut / fixed pressure plate 11 plays the role of fastening and sealing the connector. The sealing gasket 12 is a sealing protection for the central grouting pipe 3 and the protective cover, preventing the infiltration of foundation water from the connection part. The O-ring 13 is a sealing protection for the connection part between the protective sealing cover and the bearing plate 8, preventing the infiltration of foundation water from the sealing cover connection part. The conical sealing ring 14 is an effective seal for the connection and transition gap between the bearing plate 8 and the stressed parent material (non-bonded / slow-bonded steel strand 10), the central grouting pipe 3 and the bearing plate 8, ensuring the watertightness in the protective sealing cover to achieve the purpose of rust prevention and anti-seepage. The locking nut / gasket 15 is used to fasten and seal the connecting parts bearing plate 8, sealing cover, and fixed pressure plate through the central grouting pipe 3.

[0074] In summary, the anti-corrosion and anti-seepage anchor rod structure for new buildings of the present invention has the following advantages: The settlement type winged anchor backing plate of the present invention is made of HT250 gray iron or 45# steel. Under the relative acting force of the steel strand of the anchor, the bearing plate meets the requirements for bearing pressure and anti-disturbance under the support of concrete; the number of wing rings is increased or decreased according to the bearing capacity of the anchor backing plate under the calculation of bearing pressure and anti-disturbance capacity under the support of concrete, etc.; because the settlement type post-tensioning end anchor is used, the lower anchor backing plate is connected to the metal corrugated pipe to form a relatively independent cavity. After the tensioning and locking are completed, the cavity is filled with grouting material and epoxy resin waterproof material to complete the waterproof seal loop at the tensioning end; the metal corrugated pipe / metal seamless is connected to the lower opening of the settlement type winged anchor backing plate, so that a cavity is formed inside the pipe and the settlement type anchor backing plate from the cushion layer to prevent infiltration during the casting of the bottom slab concrete. After the cable anchor is tensioned and locked, C40 waterproof grouting material is injected into the cavity to form a sealed water lock; the extrusion installation position of the pressure pipe includes the outer PE layer of the steel strand when pressing in the cushion layer and below, and the steel strand above the cushion layer needs to be degreased and the PE layer removed for pressing. Its main functions are: one is that the bonding force between the metal pressure pipe and the concrete is greater than the bonding force of the PE plastic, which can effectively solve the problem of the foundation water seeping around through the bonding crack between the PE pipe and the concrete; the other is that during the construction process, the steel strand is bent when it is above the cushion layer. It is very difficult to straighten the bent steel strand, which causes difficulties in the construction of steel bar binding and anchor backing plate installation during the bottom slab casting process, especially the installation construction of the anchor during tensioning. Now, the bent steel strand with an outer pressure pipe can be easily straightened. The settlement type anchor backing plate is cast with gray iron, and its surface is rough. With the setting of the reinforcing ribs and the alignment blocks, it can better bond with the concrete and also solve the problem of the foundation water seeping around through the surface of the anchor backing plate. Through the settlement type structure, the overall tensioning end anchor body descends and maintains the surface layer thickness within the bottom slab layer, changing the situation that the upper end surface of the anchor body is within the surface layer and the distance between the upper end surface of the anchor and the upper plane of the surface layer is ≤ 3 cm. It is very difficult to control the water seepage problem with only the 2-3 cm space of concrete. The concrete of the surface layer has sufficient thickness and integrity, and its anti-seepage ability is guaranteed. The settlement type structure form ensures the surface layer thickness in the anchoring pile area and has stronger anti-seepage ability; the settlement type structure form enables the tensioning end anchor body to form a complete closed loop for anti-corrosion and anti-seepage at the upper end of the anchor rod under the functional effects of the relatively independent hole cavity, grouting material, sealing ring, and sealing cover; the structural form and materials of the settlement type anchor backing plate designed in the present invention better solve the problem of circular seepage.

[0075] The foregoing description of specific exemplary embodiments of the invention is for purposes of illustration and exemplification. These descriptions are not intended to limit the invention to the precise forms disclosed, and it is apparent that, according to the above teachings, many modifications and variations are possible. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the invention and its practical application so that those skilled in the art can implement and utilize the various different exemplary embodiments of the invention, as well as various different selections and modifications. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims

1. An anti-corrosion and anti-seepage anchor rod structure for construction, characterized in that, it includes: Multiple steel strands, which are arranged in the anchor rod hole. The top of the anchor rod hole includes a cushion layer, a bottom plate and a surface layer from bottom to top; A tension end anchor assembly, which is arranged at the top ends of the multiple steel strands and is located in the bottom plate below the surface layer. The tension end anchor assembly includes a settlement type winged anchor backing plate, which is arranged on the top of the multiple steel strands and is located at the top surface of the bottom plate. The settlement type winged anchor backing plate is a cylindrical structure, and the cylindrical structure includes a cylinder head part, a cylinder body part and a cylinder tail part from top to bottom; Wherein the tension anchor of the tension end anchor assembly is arranged at the cylinder head part; A connecting pipe, which is sleeved outside the multiple steel strands, and the upper end of the connecting pipe is hermetically connected to the lower end of the cylinder tail part; A water-stop steel ring assembly, which is embedded in both the bottom plate and the cushion layer at the same time, and the lower end of the connecting pipe extends into the water-stop steel ring assembly; And A pre-anchoring carrier assembly, which is arranged at the other ends of the multiple steel strands; Wherein the cylindrical structure further includes: Multiple strengthening wing plates, which are uniformly distributed along the axis on the outer wall of the cylinder tail part; Multiple bottom plate strengthening ribs, which extend along the axial direction and are uniformly distributed in a ring on the outer wall of the cylinder body part; and Multiple wing plate strengthening ribs, which extend along the axial direction and are uniformly distributed in a ring on the outer wall of the cylinder tail part and are located between two of the strengthening wing plates; The water-stop steel ring assembly includes: A cylinder body part, the lower part of the connecting pipe extends into the interior of the cylinder body part, and the inner wall of the cylinder body part and the outer wall of the connecting pipe are filled with waterproof grouting material; and A ring-shaped body, which is fixedly sleeved and connected to the upper part of the outer wall of the cylinder body part; Wherein the ring-shaped body is embedded between the bottom plate and the cushion layer; The settlement type winged anchor backing plate further includes: An inner hole part, which is coaxially arranged on the settlement type winged anchor backing plate. The inner hole part has a stepped hole structure corresponding to the cylinder head part, the cylinder body part and the cylinder tail part, and the internal dimensions of the stepped hole structure and the external dimensions of the cylinder head part, the cylinder body part and the cylinder tail part all gradually decrease from top to bottom, and both the outer part of the cylinder body part and the corresponding inner hole part have a taper; and Wherein the external dimension of the strengthening wing plate is larger than the external dimension of the cylinder tail part, and the thickness of each strengthening wing plate gradually thins from the root of the upper surface to the outer edge part; Wherein the cylinder head part is embedded in the surface layer, and the cylinder body part and the cylinder tail part are embedded in the bottom plate; Wherein the number of both the bottom plate strengthening ribs and the wing plate strengthening ribs is four, and each bottom plate strengthening rib and an adjacent wing plate strengthening rib adjacent to it are deflected by an angle of 45°.

2. The anti-corrosion and anti-seepage anchor rod structure for construction according to claim 1, characterized in that, The tops of the multiple steel strands are locked to the tensioning anchor by multiple working wedge grips. The tensioning anchor has a disc-shaped structure and includes multiple tapered through-holes that are evenly distributed around the center of the tensioning anchor. The tensioning anchor is arranged in the corresponding part of the inner hole part corresponding to the barrel body part with the small ends of the multiple tapered through-holes facing the tail of the barrel; wherein the working wedge grips have a structure of a pair of semi-conical sleeves. The inner part of the working wedge grips is provided with annular thread teeth, and the outer part has a taper matching the tapered through-holes. The pair of semi-conical sleeve structures of the working wedge grips are buckled at the top of the multiple steel strands where the outer protective layer is removed. At the same time, the working wedge grips are embedded in the tapered through-holes, and the upper ends of the multiple steel strands, the settlement winged anchor backing plate, the tensioning anchor, and the working wedge grips are fixedly connected together by the self-return tension of the steel strands.

3. The anti-corrosion and anti-seepage anchor structure for construction according to claim 2, characterized in that, the tensioning end anchor assembly further includes: a waterproof grouting material, which is filled in the gap between the inner wall of the inner hole part and the outer wall of the tensioning anchor, between the multiple steel strands in the inner hole part and in the connecting pipe, and between the outer wall of the connecting pipe and the inner wall of the water-stop steel ring assembly; an epoxy resin waterproof material, which is sealed at the opening at the uppermost end of the inner hole part; a foam sealant, which is filled between the outer wall of the upper end of the connecting pipe and the inner wall of the lower end of the inner hole part; and ordinary spiral stirrups, which are wound around the tail of the barrel and the outer wall of the connecting pipe; wherein the outer PE protective pipes of the multiple steel strands located inside the working wedge grips, inside the inner hole part, and in the upper part of the connecting pipe are removed.

4. The anti-corrosion and anti-seepage anchor structure for construction according to claim 1, characterized in that, it further includes: a water-stop ring end pressing pipe, which is press-fitted and installed on the outer PE protective pipe of each steel strand located inside the water-stop steel ring assembly and exposed a certain distance below the water-stop steel ring assembly; and multiple central restraint rings and multiple isolation brackets, which are arranged at intervals on the multiple steel strands located between the water-stop steel ring assembly and the front anchor bearing assembly.

5. The anti-corrosion and anti-seepage anchor structure for construction according to claim 1, characterized in that, the front anchor bearing assembly includes a guide frame restraint ring, a guide bracket, a central grouting pipe, a fixed-end anchor sealing cover, a protective medium, a fixed-end anchor, a pressing pipe / extrusion spring, a bearing plate, a nut, a locking nut / fixed pressing plate, a gasket, an O-ring, a tapered sealing ring, and a locking nut / gasket.

6. The anti-corrosion and anti-seepage anchor structure for construction according to claim 5, characterized in that, the front anchor bearing assembly further includes straight rib spiral stirrups, which are wound around the multiple steel strands exposed above the bearing plate.

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