Pressure type prestress anti-floating anchor rod and construction method thereof

Abstract

The invention relates to the technical field of constructional engineering, in particular to a pressure type prestress anti-floating anchor rod which comprises a threaded steel bar, and an anchoring device, a pre-tightening device, a water stop ring, an assembly type support, a bearing body and an end cap which are connected from top to bottom along the threaded steel bar. The anchoring device, the pre-tightening device, the assembly type support, the bearing body and the end cap are detachably connected to the threaded steel bar, and the water stop ring is fixed to a drilling hole opening. A steel pipe is arranged between the pre-tightening device and the assembly type support, and a pressure-bearing anchoring section is formed between the bearing body and the cushion layer. According to the technology, the steel pipe only needs to be installed within a certain depth range of the orifice, the prestress can be balanced through the bonding force of the steel pipe and the grouting body interface, the requirement for the construction quality of the orifice is not high, and the prestress applying process is greatly simplified.

Description

Technical Field

[0001] The invention relates to the technical field of construction engineering, and in particular to a pressure-type prestressed anti-floating anchor rod and a construction method thereof. Background Art

[0002] In the field of anti-floating anchors in underground projects, pressure anchors are also being promoted and applied as this type of anti-floating anchor. However, since the rod body steel bars of the pressure anchor must be completely unbonded, that is, the steel bars and the anchor grouting body are in an isolated state, the elastic deformation of the steel bars is large when the anchor is subjected to tension. In addition, the shear deformation of the interface between the anchor body and the rock and soil body significantly increases the tensile deformation of the anchor end. Therefore, when using pressure anchors for anti-floating anchors, the rod body needs to be pre-tensioned to eliminate the elastic deformation of the rod body.

[0003] In order to pre-tension the pressure-type anti-floating anchor rod, the current method mainly adopts the method of setting steel pads and steel pads at the hole mouth. After the steel bar is tensioned, nuts are used to lock it on the steel pads or steel pads. However, the above method has the following serious problems in actual engineering: (1) There is a lot of floating slurry at the hole mouth of the anchor rod, and the mud content is often relatively large, which leads to a significant reduction in the maximum strength of the hole mouth grouting body. The maximum compressive bearing capacity of the slurry is lower than or even far lower than the design value of the compressive strength, and it cannot meet the pre-tensioning requirements. (2) The soil at the hole mouth is often softened by the mud during construction. Affected by the construction period, the strength of the soil at the hole mouth is very low during pre-tensioning, forming a weak layer, which cannot meet the requirements of pre-tensioning of the anti-floating anchor rod. (3) Since the floating slurry and soil at the hole mouth of the anchor rod are very low in strength and cannot meet the requirements of pre-tensioning of the anti-floating anchor rod, the locking tension value of the pre-tensioning cannot meet the design requirements during actual on-site construction, and the pre-tensioning is ineffective, which brings serious safety hazards to the project. Therefore, when using prestressed anti-floating anchor rods, new technical methods must be developed or used to solve the problem of applying prestress to the anti-floating anchor rods.

[0004] Based on this, in order to solve the problem of applying prestress to the anti-floating anchor rod, the invention of this technical solution was made. Summary of the invention

[0005] In order to address the deficiencies in the prior art, the present invention provides a pressure-type prestressed anti-floating anchor rod, comprising a threaded steel bar, and an anchoring device, a pre-tightening device, a water-stop ring, an assembled bracket, a bearing body and an end cap connected from top to bottom along the threaded steel bar, wherein the anchoring device, the pre-tightening device, the assembled bracket, the bearing body and the end cap are detachably connected to the threaded steel bar, and the water-stop ring is fixed to the drilled hole; a steel pipe is arranged between the pre-tightening device and the assembled bracket, an isolation sleeve is arranged between the pre-tightening device and the bearing body, and a pressure-bearing anchoring section is formed between the bearing body and the cushion layer.

[0006] The present invention also provides a construction method of a pressure-type prestressed anti-floating anchor rod, comprising the following steps: S11, anchor rod production, the bearing body and the end cap are installed at the bottom of the threaded steel bar in sequence, the isolation sleeve and the spiral reinforcement are installed above the bearing body, and then the assembled bracket is installed to lock the threaded steel bar and the isolation sleeve; S12, installing the grouting pipes, passing the first grouting pipe and the second grouting pipe through the bottom of the bearing body and installing them into the end cap, and the first grouting pipe and the second grouting pipe are fixed by binding them at intervals with fine-rolled threaded steel bars; S13, drilling and grouting, drilling at a preset position, after drilling to a preset elevation, putting a processed anchor rod into the borehole to a preset depth, inserting a water stop ring into the hole mouth, making the ring plate of the water stop ring rest on the cushion layer, inserting a steel pipe from the top of the threaded steel bar, and after the steel pipe passes through the upper ring hole and the lower ring hole of the water stop ring, it abuts on the assembled bracket and is exposed from the upper ring pipe of the water stop ring; grouting into the borehole through a first grouting pipe, stopping grouting after continuous grouting at the hole mouth, and performing secondary grouting through a second grouting pipe after the first grouting is completed and the designed time interval is reached; S14, prestressing tensioning, after the strength of the grouting body reaches the design requirements, the prestressing device is inserted into the top of the threaded steel bar, and then the reaction frame is installed on the cushion layer. The threaded steel bar is tensioned by a through-hole jack. After the tension reaches the design requirements, the prestressing device is locked downward; S15, base plate construction, laying waterproof membrane on the cushion layer to form a waterproof layer, the waterproof membrane overlaps the ring plate of the water stop ring; then pour a protective layer on the waterproof membrane, and then install the anchor device to carry out base plate construction.

[0007] Compared with the prior art, the pressure-type prestressed anti-floating anchor provided by the present invention has the following advantages: (1) Simplify the prestressing process. The traditional method uses steel pads or steel piers to apply prestress, which has high requirements on the flatness of the anchor hole and requires special steel piers. The technology of the present invention only needs to install steel pipes within a certain depth range of the hole, and the prestress can be balanced by the bonding force between the steel pipe and the grouting body. It does not require high construction quality of the hole, which greatly simplifies the prestressing process.

[0008] (2) The quality is more reliable. The traditional prestressing method mainly relies on the bearing capacity of the slurry and soil at the bottom of the hole of the pad or pier to balance. However, due to the floating slurry of the hole grouting liquid and the softening of the hole soil, its bearing capacity cannot meet the requirements of the prestress locked after pre-tensioning, which causes a high risk of accidents. The method of the present invention relies on the interface bonding force between the steel pipe and the grouting body at the hole to balance the prestress, and the diameter and length of the steel pipe can be adjusted according to the size of the prestress, fully ensuring sufficient reaction force to balance the prestress. In addition, the bonding force at the interface between the steel pipe and the grouting body is very high, which is easy to meet the design requirements. Therefore, the quality of applying prestress using the method of the present invention is more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0010] Figure 1 A three-dimensional diagram of a forged integrated carrier with a circular through-tube hole provided in the first embodiment of the present invention; Figure 2 A top view of a forged integrated carrier with a circular through-tube hole provided in the first embodiment of the present invention; Figure 3 A bottom view of a forged integrated carrier with a circular through-tube hole provided in the first embodiment of the present invention; Figure 4 A cross-sectional view of a forged integrated carrier having a circular through-tube hole provided in the first embodiment of the present invention; Figure 5 A side view of a forged integrated carrier with a circular through-tube hole provided in the first embodiment of the present invention; Figure 6 Another stereoscopic view of the forged integrated carrier with circular through-tube holes provided in the first embodiment of the present invention.

[0011] Figure 7 A top view of a welded integrated carrier with a circular through-tube hole provided in the second embodiment of the present invention; Figure 8 A bottom view of a welded integrated carrier with a circular through-tube hole provided in the second embodiment of the present invention; Fig. 9 A cross-sectional view of a welded integrated carrier with a circular through-tube hole provided in the second embodiment of the present invention; Fig.10 A three-dimensional diagram of a welded integrated carrier with a circular through-tube hole provided in the second embodiment of the present invention; Fig.11 A top view of a welded integrated carrier with a semicircular notch as the through-tube hole provided in the third embodiment of the present invention; Fig.12 A bottom view of a welded integrated carrier with a semicircular notch as the through-tube hole provided in the third embodiment of the present invention; Fig.13 A front view of a welded integrated carrier with a semicircular notch as the through-tube hole provided in the third embodiment of the present invention; Fig.14 A left side view of a welded integrated carrier with a semicircular notch as the through-tube hole provided in the third embodiment of the present invention; Fig.15 A three-dimensional diagram of a welded integrated carrier with a semicircular notch as provided in the third embodiment of the present invention.

[0012] Fig.16 A schematic diagram of the structure of a pressure-type prestressed anti-floating anchor provided in the fourth embodiment of the present invention; Fig.17 for Figure 1 1-1 cross-sectional view; Fig.18 for Figure 1 2-2 section view; Fig.19 for Figure 1 3-3 section view; Fig. 20 for Figure 1 Section 4-4 of ; Fig.21 for Figure 1 Section 5-5 of ; Fig. 22 A schematic diagram of the structure of an anchoring device provided in Embodiment 4 of the present invention; Fig.23 A schematic diagram of the front structure of an equal-diameter water stop ring with an upper ring tube and a lower ring tube having the same diameter provided in the fourth embodiment of the present invention; Fig.24 A schematic diagram of the top view of the water stop ring provided in the fourth embodiment of the present invention; Fig.25 A schematic diagram of the front structure of a variable diameter water stop ring in which the upper ring tube diameter is smaller than the lower ring tube diameter provided in the fourth embodiment of the present invention; Fig.26 A schematic diagram of the front structure of a sleeve-type water stop ring without a sleeve tube installed provided in the fourth embodiment of the present invention; Fig. 27 A schematic diagram of the front structure of a sleeve pipe of a sleeve type water stop ring is provided for the fourth embodiment of the present invention; Fig.28 A right side view of the sleeve type water stop ring provided in the fourth embodiment of the present invention when the sleeve pipe is installed; Fig.29 A front view of a sleeve-type water stop ring provided in the fourth embodiment of the present invention when a sleeve pipe is installed; Fig.30 A cross-sectional view of an end cap provided in Embodiment 4 of the present invention; Fig.31 for Fig. 20 AA section view; Fig.32 for Fig. 20 BB cross-section diagram; Fig.33 for Fig. 20 CC profile of ; Fig.34 A top view of an assembled bracket provided in Embodiment 4 of the present invention; Fig.35 A bottom view of the assembled bracket provided in the fourth embodiment of the present invention; Fig.36 A top view of a first bracket member provided in Embodiment 4 of the present invention; Fig.37 A front view of an assembled bracket provided in the fourth embodiment of the present invention; Fig.38 This is a rear view of the assembled bracket provided in the fourth embodiment of the present invention.

[0013] Reference numerals: DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0015] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0016] Embodiment 1 This embodiment provides an integrated carrier 220, such as Figures 1 to 3 As shown, in this embodiment, the horizontal cross-section of the bearing cap 222 is circular, and the bearing plate 221 and the bearing cap 222 are integrally formed. In specific implementation, the bearing cap 222 can be integrally formed by forging and casting. After the bearing cap 222 is installed on the steel bar, the connection force with the steel bar is not less than the ultimate pull-out bearing capacity of the anchor rod applied to the bearing body. Preferably, in this embodiment, the through-tube hole 224 is a circular hole arranged near the edge of the bearing plate 221, or the through-tube hole 224 can be a semicircular hole arranged at the edge of the bearing plate 221.

[0017] In addition, in order to enhance the pull-out bearing capacity of the carrier, the existing carrier is equipped with stiffening ribs at the bottom of the carrier plate 221. However, the prior art is to weld the external stiffening ribs to the carrier plate 221, which also causes the problem of complicated production process of the carrier.

[0018] To solve this technical problem, the present invention provides a reinforcing cone 226 at the bottom of the bearing plate 221. Figures 4 to 5 As shown, the vertical height of the reinforcing cone 226 increases linearly with a preset slope from the edge of the bearing plate 221 to the bearing cap 222, so that the bottom of the bearing plate 221 has a slope, and the reinforcing cone 226 is integrally formed with the bearing plate 221 and the bearing cap 222. The anti-pulling bearing capacity of the bearing body is improved by providing the reinforcing cone 226. At the same time, the reinforcing cone 226 is provided at the bottom of the bearing plate 221, and is integrally formed with the bearing plate 221 and the circular bearing cap 222. Specifically, it can be integrally formed by a forging and casting process.

[0019] Preferably, if Figure 6 As shown, the inner wall of the third reinforcing hole 223 of the bearing plate 221 and the bearing cap 222 is provided with a continuous internal thread 225. Specifically, the outer surface of the finely rolled threaded steel bar installed on the bearing body is provided with an external thread, and the inside of the third reinforcing hole 223 is provided with a matching internal thread 225, and the external thread on the outer surface of the threaded steel bar is threadedly connected with the internal thread 225 inside the third reinforcing hole 223, thereby ensuring the stability of the bearing body installation.

[0020] Embodiment 2 This embodiment provides an integrated carrier 220, such as Figure 7 , Figure 8 and Fig. 9 As shown, it includes a fixedly connected bearing plate 221 and a bearing cap 222, the plane of the bearing plate 221 is perpendicular to the axial normal of the bearing cap 222, the bearing plate 221 and the bearing cap 222 are provided with a connected third rib hole 223, the horizontal cross-section of the bearing plate 221 is circular, and a tube hole 224 is provided on the surface of the bearing plate 221.

[0021] During specific implementation, the horizontal cross-section of the bearing plate 221 is circular, the bearing body is fixed to the threaded steel bar through the third reinforcement hole 223, the bearing plate 221 is set upward toward the drill hole, and the area of ​​the circular bearing plate 221 is large enough, so a pipe hole 224 can be set on the surface of the bearing plate 221 to facilitate the installation of the grouting pipe.

[0022] In one embodiment, the number of the through-tube holes 224 is two. Specifically, in the actual construction process, generally only two grouting pipes are installed for grouting, and the number of grouting pipes can also be set. Optionally, the through-tube holes 224 can be symmetrically arranged around the center of the bearing plate 221, or they can be non-symmetrically arranged.

[0023] In one embodiment, if Figure 8 and Fig.10 As shown, the horizontal cross section of the bearing cap 222 is hexagonal, and the bearing plate 221 is welded to the bearing cap 222. Specifically, the bearing cap 222 is a nut with a hexagonal cross section, which is welded with the circular bearing plate 221 to form an integrated one-piece bearing body 220. At this time, an internal thread 225 is arranged inside the third reinforcement hole 223 of the bearing cap 222 to match the external thread of the threaded steel bar. The strength of the hexagonal nut is consistent with that of the threaded steel bar. After the bearing cap 222 is installed on the steel bar, the connection force with the steel bar is not less than the ultimate pull-out bearing capacity of the anchor rod applied to the bearing body.

[0024] Preferably, if Figures 7 to 10 As shown, the through-tube hole 224 is a circular hole disposed near the edge of the supporting plate 221 .

[0025] Embodiment 3 In this embodiment, the through-tube hole 224 is a semicircular hole arranged at the edge of the supporting plate 221. Figures 11 to 15 As shown, the pipe hole 224 is a semicircular notch set at the edge of the bearing plate 221. When the construction period is very tight, the grouting pipe can be directly stuck on the semicircular notch for quick binding and fixing. The horizontal cross-section of the bearing cap 222 is a hexagon.

[0026] The remaining structures are the same as those of the first embodiment and will not be described in detail here.

[0027] Embodiment 4 The present invention provides a pressure-type prestressed anti-floating anchor rod, such as Figures 16 to 21 As shown, it includes a threaded steel bar 110, and an anchor device 200, a pre-tightening device 210, a water stop ring 240, an assembled bracket 260, an integrated carrier 220 and an end cap 250 connected from top to bottom along the threaded steel bar 110. The anchor device 200, the pre-tightening device 210, the assembled bracket 260, the integrated carrier 220 and the end cap 250 are detachably connected to the threaded steel bar 110, and the water stop ring 240 is fixed to the drilled hole 104.

[0028] A steel pipe 112 is provided between the preload device 210 and the assembled bracket 260, an isolation sleeve 111 is provided between the preload device 210 and the integrated carrier 220, and a pressure anchoring section 108 is formed between the integrated carrier 220 and the cushion layer 103. Specifically, both ends of the isolation sleeve 111 are sealed.

[0029] In one embodiment, if Fig. 22As shown, the anchoring device 200 includes a first nut 201 and a first steel pad 202. The first steel pad 202 is vertically connected to the first nut 201. The first steel pad 202 and the first nut 201 are provided with a connected first reinforcement hole 203. The inner wall of the first reinforcement hole 203 forms an internal thread 225, which is threadedly connected with the external thread of the threaded steel bar 110.

[0030] In one embodiment, the pre-tightening device 210 includes a second nut 211 and a second steel plate 212, the second steel plate 212 is vertically connected to the second nut 211, the second steel plate 212 and the second nut 211 are provided with a second reinforcing bar hole 213 that is connected, and the inner wall of the second reinforcing bar hole 213 forms an internal thread 225 that is threadedly connected to the external thread of the threaded steel bar 110.

[0031] In one embodiment, the carrier is an integrated carrier 220 as described in any one of the first embodiment, the second embodiment and the third embodiment, and the structure is the same, which will not be repeated here.

[0032] In one embodiment, the outer side of the integrated carrier 220 is provided with a spiral rib 113, the diameter of which is greater than the longest length of the bearing plate 221 of the integrated carrier 220, and the spiral rib 113 is used to laterally or radially constrain the grouting body 105. Specifically, the outer side of the integrated carrier 220 of the present invention is provided with a spiral rib 113, the diameter of which is greater than the longest length of the bearing plate 221 of the integrated carrier 220. Preferably, the integrated carrier 220 of the present invention is a circular integrated carrier 220, and the diameter of the spiral rib 113 is greater than the diameter of the integrated carrier 220. When the cross section of the bearing plate 221 is elliptical, the diameter of the spiral rib 113 is greater than the length of the long axis of the integrated carrier 220.

[0033] Specifically, since the top surface of the bearing plate 221 of the integrated bearing body 220 is a slope or spherical surface symmetrical along the long axis, when the grouting body 105 is squeezed, a splitting effect will be generated on the grouting body 105. The spiral ribs 113 are sleeved on the outer side of the integrated bearing body 220, which will have a strong lateral or radial restraining effect on the grouting body 105, significantly improving the compressive bearing capacity of the grouting body 105, thereby fully ensuring the coordinated bearing of the pressure-bearing anchoring section 108 and the tension-bearing anchoring section 109, and greatly improving the pull-out bearing capacity of the tension-compression composite anti-floating anchor.

[0034] In one embodiment, the water stop ring 240 includes an upper ring tube 241, a lower ring tube 242 and a ring plate 243. The upper ring tube 241 is located above the ring plate 243, and the lower ring tube 242 is located below the ring plate 243. The ring plate 243 is provided with a ring plate hole 243a. The upper ring tube 241 and the lower ring tube 242 are hollow to form an upper ring hole 241a and a lower ring hole 242a. The normal axes of the upper ring hole 241a, the ring plate hole 243a and the lower ring hole 242a coincide.

[0035] Specifically, when the normal axis coincides, the plane of the ring plate 243 is vertically arranged with the upper ring tube 241 and the lower ring tube 242. The water stop ring 240 is embedded between the bottom plate 100 and the borehole 104, and a cushion layer 103 is also arranged between the bottom plate 100 and the borehole 104. The ring plate 243 abuts against the cushion layer 103, and the anchor bar 110 is placed in the borehole 104 after passing through the upper ring hole 241a, the ring plate hole 243a and the lower ring hole 242a. The side walls of the upper ring tube 241 and the lower ring tube 242 can effectively prevent groundwater from penetrating between the bottom plate 100 and the cushion layer 103, and between the cushion layer 103 and the soil layer of the borehole 104, thereby avoiding corrosion of the steel bars.

[0036] Preferably, if Figure 23 to Figure 25 As shown, the diameter of the upper annular hole 241a is the same as the diameter of the annular plate hole 243a and the lower annular hole 242a, or the diameter of the upper annular hole 241a is smaller than the diameter of the annular plate hole 243a and the lower annular hole 242a.

[0037] In one embodiment, the water stop ring 240 is further provided with a collar tube 244, and the collar tube 244 is installed on the outside of the upper ring tube 241. Fig.26 As shown, the upper ring tube 241 is symmetrically provided with hanging rod placement grooves 245. Fig. 27 As shown, the collar tube 244 is symmetrically provided with hanger cover holes 246 , and the hanger cover holes 246 are arranged opposite to the hanger placement groove 245 .

[0038] In specific implementation, the diameters of the anchor bars 110 required for fixing vary greatly, and the diameters of the anchor bars 110 required for different geological environments are all different, so a hanger bar placement groove 245 is provided on the upper ring tube 241, and the hanger bar placement groove 245 abuts against the ring plate 243. The width of the hanger bar placement groove 245 can match the requirements of different anchor bar 110 diameters, so that the transverse hanger bar 247 can be stably installed and pressed against the ring plate 243. Preferably, the shape of the hanger bar placement groove 245 is rectangular, and the rectangular shape can be more conducive to the placement of the anchor bars 110.

[0039] In one embodiment, if Fig.28 , Fig.29As shown, the collar tube 244 is sleeved on the outside of the upper ring tube 241 and is detachably connected to the water stop ring 240. The collar tube 244 includes a transverse plate 244a and a longitudinal plate 244b perpendicular to each other. The hanging bar cover hole 246 is opened at the bottom of the longitudinal plate 244b. The opening of the hanging bar cover hole 246 can completely match the cross section of the transverse hanging bar 247. The distance between the hanging bar cover holes 246 can be determined according to the diameter of the anchor bar 110. The hanging bar placement groove 245 of the upper ring tube 241 is matched with the hanging bar cover hole 246 of the collar tube 244, which can match the installation requirements of different types of steel bars. At the same time, there is no need to add a mold for the upper ring tube 241. It is only necessary to produce the collar tube 244 according to different requirements, which greatly reduces the cost.

[0040] Preferably, if Fig. 27 As shown, the shape of the hanger cover hole 246 is a groove or a semicircle. Specifically, the cross section of the anchor bar 110 is generally circular, and the hanger cover hole 246 is set to be a groove or a semicircle to better fit the anchor bar 110.

[0041] In one embodiment, if Figure 30 to Figure 33 As shown, the end cap 250 includes a ball head 253, a screw groove 251, a flexible blade 254 and a stiffening rib 252. The ball head 253 is a hollow hemisphere. Two flexible blades 254 are connected to the upper part of the ball head 253. The horizontal cross-sectional diameter of the flexible blade 254 gradually increases upward. The cross-sectional shape after the ball head 253 and the flexible blade 254 are connected is "U"-shaped. The screw groove 251 is set at the inner center of the ball head 253. A stiffening rib 252 is set between the ball head 253 and the screw groove 251. The stiffening rib 252 is symmetrically arranged around the screw groove 251 at preset angles.

[0042] In one embodiment, if Figure 34 to Figure 38 As shown, the assembled bracket 260 includes a first bracket member 260a, a second bracket member 260b and a connecting member 267. The shapes of the first bracket member 260a and the second bracket member 260b are symmetrical, and the connecting member 267 connects the first bracket member 260a and the second bracket member 260b symmetrically and detachably. The first bracket member 260a and the second bracket member 260b both include an end face 261 and a rib arc surface 265, and the rib arc surface 265 is vertically connected to the bottom of the end face 261. The rib arc surface 265 of the first bracket member 260a and the rib arc surface 265 of the second bracket member 260b are spliced ​​to form a rib groove, and the rib groove is set at the center of the splicing of the end faces 261 of the first bracket member 260a and the second bracket member 260b.

[0043] In specific implementation, a semicircular rib arc surface 265 with a certain length is provided at the bottom of the end surface 261, and the rib arc surface 265 of the first bracket member 260a and the rib arc surface 265 of the second bracket member 260b are spliced ​​to form a rib groove for placing the threaded steel bar 110, which is arranged at the center of the end surface 261. The split first bracket member 260a and the second bracket member 260b are symmetrical in shape. When the assembled bracket 260 needs to be installed, the first bracket member 260a and the second bracket member 260b are directly spliced ​​at the designed position of the assembled bracket 260 of the threaded steel bar 110, and the rib arc surface 265 is buckled on the threaded steel bar 110. The first bracket member 260a and the second bracket member 260b are symmetrically and detachably connected through the connecting member 267, which greatly simplifies the construction strength and avoids the anti-corrosion coating of the threaded steel bar 110 from being damaged.

[0044] Preferably, the shape of the end faces 261 of the first bracket member 260a and the second bracket member 260b after being spliced ​​is an ellipse. Specifically, the shape of the end faces 261 of the first bracket member 260a and the second bracket member 260b after being spliced ​​is an ellipse, which reduces the cross-sectional area of ​​the assembled bracket 260 in the borehole 104, increases the area of ​​the gap between the end face 261 and the borehole 104, and avoids the excessively large cross section from blocking the grouting body 105.

[0045] In one embodiment, the assembled bracket 260 is further provided with two pipe grooves 266, which are semicircular notches. The pipe grooves 266 are symmetrically arranged on the long axis of the elliptical end face 261 after the first bracket member 260a and the second bracket member 260b are spliced. Specifically, in the actual construction process, the pipe grooves 266 are for the grouting pipe to pass through. The number of grouting pipes is generally two, so the setting of two pipe grooves 266 can meet most construction needs; the number of pipe grooves 266 can also be designed according to specific circumstances and is not limited to two. The shape of the pipe groove 266 is a semicircular notch, which can be well adapted to the shape of the grouting pipe. When the grouting pipe is installed, the pipe groove 266 clamps the grouting pipe to ensure the overall installation direction of the grouting pipe and the accuracy of the installation position of the grouting pipe.

[0046] In one embodiment, the rib groove 264 is provided with a rib groove matching the threaded steel bar 110. Specifically, the rib groove 264 of the assembled bracket 260 is provided with a rib groove matching the ribs of the threaded steel bar 110, and the rib groove inside the rib groove 264 matches the ribs of the threaded steel bar 110, thereby ensuring the firmness of the assembled bracket 260 installed on the threaded steel bar 110.

[0047] In one embodiment, if Fig.37 and Fig.38As shown, the first bracket member 260a and the second bracket member 260b respectively include two locking surfaces 262, and the two locking surfaces 262 are respectively connected to the two sides of the rib arc surface 265, and the top of the locking surface 262 is connected to the bottom of the end surface 261; at least one locking hole 263 is provided on the locking surface 262, and the locking hole 263 of the first bracket member 260a and the locking hole 263 of the second bracket member 260b are opposite to each other, and the connecting member 267 passes through the locking hole 263 of the first bracket member 260a and the locking hole 263 of the second bracket member 260b to symmetrically and detachably connect the first bracket member 260a and the second bracket member 260b.

[0048] In one embodiment, the connecting member 267 includes a screw rod 267a and a nut 267b.

[0049] During specific implementation, the first bracket member 260a and the second bracket member 260b are installed on the threaded steel bar 110 from both sides, so that the rib grooves on the inner walls of the rib grooves 264 of the first bracket member 260a and the second bracket member 260b are matched with the ribs on the outer wall of the threaded steel bar 110, and at the same time, the locking hole 263 of the first bracket member 260a and the locking hole 263 of the second bracket member 260b are aligned, and the locking hole 263 of the first bracket member 260a and the locking hole 263 of the second bracket member 260b are connected by a screw rod 267a, and the first bracket member 260a and the first bracket member 260a can be spliced ​​together to form a complete assembled bracket 260 by locking with a nut 267b. In this way, the splicing installation from both sides of the threaded steel bar 110 realizes the efficient installation of the assembled bracket 260, and at the same time avoids damaging the anti-corrosion coating on the surface of the threaded steel bar 110.

[0050] Embodiment 5 The present invention also provides a construction method of a pressure-type prestressed anti-floating anchor rod, comprising the following steps: S11, anchor rod production, the integrated carrier 220 and the end cap 250 are sequentially installed at the bottom of the threaded steel bar 110, the isolation sleeve 111 and the spiral steel bar 113 are installed above the integrated carrier 220, and then the assembled bracket 260 is installed to lock the threaded steel bar 110 and the isolation sleeve 111; The integrated carrier 220 in this embodiment is preferably a circular integrated carrier 220. Since it is necessary to install an isolation sleeve 111 between the circular integrated carrier 220 and the pre-tightening device 210 later, but the pre-tightening device 210 is installed after grouting, after the integrated carrier 220 is installed, the isolation sleeve 111 needs to be installed in advance and locked with an assembled bracket 260 to facilitate the subsequent construction process.

[0051] S12, installing the grouting pipes, passing the first grouting pipe 106 and the second grouting pipe 107 through the bottom of the integrated carrier 220 and installing them into the end cap 250, and the first grouting pipe 106 and the second grouting pipe 107 are fixed by binding at intervals through the fine-rolled threaded steel bars 110; During specific implementation, the first grouting pipe 106 and the second grouting pipe 107 pass through the third rib hole 223 of the integrated carrier 220, and the bottom abuts against the inner wall of the flexible blade 254 of the end cap 250. To ensure that the first grouting pipe 106 and the second grouting pipe 107 do not shake and facilitate installation, the first grouting pipe 106 and the second grouting pipe 107 are tied together at intervals using fine-rolled threaded steel bars 110.

[0052] S13, grouting of the borehole 104, drilling the hole 104 at a preset position, after drilling the hole 104 to a preset elevation, inserting the processed anchor rod into the borehole 104 to a preset depth, inserting the water stop ring 240 into the hole mouth, so that the ring plate 243 of the water stop ring 240 is placed on the cushion layer 103, inserting the steel pipe 112 from the top of the threaded steel bar 110, after the steel pipe 112 passes through the upper ring hole 241a and the lower ring hole 242a of the water stop ring 240, it abuts against the assembled bracket 260 and is exposed from the upper ring pipe 241 of the water stop ring 240; grouting is injected into the borehole 104 through the first grouting pipe 106, and the grouting is stopped after the hole mouth continuously returns to grouting, and after the first grouting is completed and reaches the designed time interval, the second grouting is performed through the second grouting pipe 107; S14, prestressing tensioning, after the strength of the grouting body 105 reaches the design requirements, the prestressing device 210 is inserted into the top of the threaded steel bar 110, and then the reaction frame is installed on the cushion layer 103, and the threaded steel bar 110 is tensioned by a through-hole jack. After the tension reaches the design requirements, the prestressing device 210 is locked and fixed downward; Specifically, the pre-tightening device 210 includes a second steel plate 212 and a second nut 211 , and the insertion order of the pre-tightening device 210 of the threaded steel bar 110 is the second steel plate 212 and the second nut 211 .

[0053] S15, construction of the base plate 100, laying the waterproof membrane 102 on the cushion layer 103 to form a waterproof layer, the waterproof membrane 102 overlaps the ring plate 243 of the water stop ring 240; then pouring the protective layer 101 on the waterproof membrane 102, and then installing the anchor device 200 to construct the base plate 100.

[0054] In specific implementation, the waterproof coiled material 102 is laid on the upper surface of the ring plate 243 of the water stop ring 240 to prevent groundwater from penetrating. The anchoring device 200 includes a first nut 201 and a first steel pad 202. The first nut 201 and the first steel pad 202 are welded around each other so that the first steel pad 202 is at the bottom and the first nut 201 is at the top. The anchoring device 200 is fixed on the top of the threaded steel bar 110, and then the bottom plate 100 is constructed.

[0055] Although the terms such as base plate, protective layer, waterproofing membrane, cushion layer, drilling hole, grouting body, first grouting pipe, second grouting pipe, pressure anchoring section, tension anchoring section, threaded steel bar, isolation sleeve, steel pipe, spiral reinforcement, anchoring device, first nut, first steel pad, first reinforcement hole and pre-tightening device are used more frequently in this article, the possibility of using other terms is not excluded. The use of these terms is only for more convenient description and explanation of the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pressure-type prestressed anti-floating anchor, characterized in that: It comprises a threaded steel bar, and an anchoring device, a pre-tightening device, a steel pipe, a water stop ring, an assembled bracket, an isolation sleeve, a bearing body and an end cap connected from top to bottom along the threaded steel bar, wherein the anchoring device, the pre-tightening device, the assembled bracket, the bearing body and the end cap are detachably connected to the threaded steel bar, and the water stop ring is fixed to the drill hole; A steel pipe is arranged between the pre-tightening device and the assembled bracket, an isolation sleeve is arranged between the pre-tightening device and the bearing body, and a pressure-bearing anchoring section is formed between the bearing body and the cushion layer.

2. The pressure-type prestressed anti-floating anchor according to claim 1 is characterized in that: The outer side of the carrier is sleeved with spiral ribs, the diameter of the spiral ribs is greater than the longest length of the carrier plate of the carrier, and the spiral ribs are used to constrain the grouting body laterally or radially.

3. The pressure-type prestressed anti-floating anchor according to claim 1 is characterized in that: The water stop ring includes an upper ring tube, a lower ring tube and a ring plate. The upper ring tube is located above the ring plate, and the lower ring tube is located below the ring plate. The ring plate is provided with a ring plate hole. The upper ring tube and the lower ring tube are hollowed to form an upper ring hole and a lower ring hole respectively. The normal axes of the upper ring hole, the ring plate hole and the lower ring hole coincide.

4. The pressure-type prestressed anti-floating anchor according to claim 3 is characterized in that: The water stop ring is also provided with a collar tube, which is installed on the outside of the upper ring tube. The upper ring tube is symmetrically provided with hanger rod placement grooves, and the collar tube is symmetrically provided with hanger rod cover holes, which are arranged opposite to the hanger rod placement grooves.

5. The pressure-type prestressed anti-floating anchor according to claim 1 is characterized in that: The assembled bracket comprises a first bracket member, a second bracket member and a connecting member, the first bracket member and the second bracket member are symmetrical in shape, and the connecting member connects the first bracket member and the second bracket member symmetrically and detachably; The first bracket component and the second bracket component both include an end face and a rib arc surface, wherein the rib arc surface is vertically connected to the bottom of the end face; the rib arc surface of the first bracket component and the rib arc surface of the second bracket component are spliced ​​to form a rib groove, and the rib groove is arranged at the center of the spliced ​​end faces of the first bracket component and the second bracket component.

6. The pressure-type prestressed anti-floating anchor according to claim 5 is characterized in that: The shape of the end faces of the first bracket component and the second bracket component after being spliced ​​is an ellipse; the assembled bracket for the anti-floating anchor rod is also provided with two pipe grooves, the shape of the pipe grooves is a semicircular notch, and the pipe grooves are symmetrically arranged on the long axis of the end face of the ellipse after the first bracket component and the second bracket component are spliced.

7. The pressure-type prestressed anti-floating anchor according to claim 6 is characterized in that: The first bracket component and the second bracket component respectively include two locking surfaces, and the two locking surfaces are respectively connected to two sides of the rib arc surface.

8. The pressure-type prestressed anti-floating anchor according to claim 7 is characterized in that: At least one locking hole is provided on the locking surface, the locking hole of the first bracket component and the locking hole of the second bracket component are opposite to each other, and the connecting member passes through the locking hole of the first bracket component and the locking hole of the second bracket component to symmetrically and detachably connect the first bracket component and the second bracket component.

9. The pressure-type prestressed anti-floating anchor according to claim 5, characterized in that: The inner wall of the rib groove is provided with a rib groove matching the threaded steel bar.

10. A construction method for a pressure-type prestressed anti-floating anchor, characterized in that: The steps include: S11, anchor rod production, install the bearing body and the end cap at the bottom of the threaded steel bar in sequence, install the spiral reinforcement and the isolation sleeve above the bearing body, and then install the assembled bracket at the designed position; S12, installing the grouting pipes, installing the first grouting pipe and the second grouting pipe through the bottom of the carrier into the end cap, the first grouting pipe and the second grouting pipe are fixed by binding with fine-rolled threaded steel bars at intervals, and fixed on the assembled bracket; S13, drilling and grouting, drilling at a preset position, after drilling to a preset elevation, putting a processed anchor rod into the drilled hole to a preset depth, inserting a water stop ring into the hole mouth, making the ring plate of the water stop ring rest on the cushion layer, inserting a steel pipe from the top of the threaded steel bar, and after the steel pipe passes through the upper ring hole and the lower ring hole of the water stop ring, it abuts on the assembled bracket and is exposed from the upper ring tube of the water stop ring; grouting into the drilled hole through the first grouting pipe, stopping grouting after continuous grouting at the hole mouth, and performing secondary grouting through the second grouting pipe after the first grouting is completed and the designed time interval is reached; S14, prestressing tensioning, after the strength of the grouting body reaches the design requirements, a prestressing device is inserted into the top of the threaded steel bar, and then a reaction frame is installed on the cushion layer, and the threaded steel bar is tensioned by a through-hole jack. After the tension reaches the design requirements, the prestressing device is locked downward and fixed; S15, base plate construction, laying waterproof membrane on the cushion layer to form a waterproof layer, the waterproof membrane overlaps the ring plate of the water stop ring; then pouring a protective layer on the waterproof membrane, followed by installing an anchoring device to carry out the base plate construction.

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