A prestressed tension-compression composite anti-floating anchor rod and construction method thereof

Abstract

The present invention proposes a prestressed tension-compression composite anti-floating anchor rod, comprising an anchor rod body, on which a first cylindrical pressure plate, a grease strip and an anti-corrosion sleeve are arranged, the anchor rod body forms a pressure-bearing anchoring section and a tension-bearing anchoring section on the upper and lower sides of the first cylindrical pressure plate, respectively, the grease strip is wrapped around the anchor rod body, the anti-corrosion sleeve is sleeved outside the grease strip, and also includes a sealing cylinder arranged on the top of the anchor rod body, which is a cylindrical shape with an internal cavity formed by screwing a U-shaped cylinder and a U-shaped cover plate, a simple jack and a second cylindrical pressure plate are mounted on the anchor rod body in the sealing cylinder, and the sealing cylinder is provided with a lower grouting pipe and an upper exhaust pipe connected to the outside. The prestressed tension-compression composite anti-floating anchor rod of the present invention can improve the anti-corrosion performance, the structure is more stable, and the construction is convenient. The present invention also proposes a construction method of the prestressed tension-compression composite anti-floating anchor rod, which can shorten the construction period.

Description

Technical Field

[0001] The invention relates to a prestressed tension-compression composite anti-floating anchor rod and a construction method thereof, belonging to the technical field of building construction. Background Art

[0002] For permanent anchoring projects, the anti-corrosion design and construction quality directly affect the durability of the anchor rod and the safety of the project. Theoretical research and engineering application of an authorized tension-compression composite anchor rod (patent number: ZL201420450678.5) show that under the same anchoring length, the bearing capacity of the tension-compression composite anchor rod is significantly improved.

[0003] The anti-corrosion performance of the anchor rod can be significantly improved through reasonable anti-corrosion structural design. Combined with the applied prestress, the stress state of the anchored structure or soil can be significantly improved, and the safety of the anchored body can be improved. The existing technology is to first partially construct the bottom layer of the structure as a force transmission structure, then apply prestress, and then cast the bottom layer of the structure for the second time. The process is cumbersome, the construction period is long, and the construction efficiency is low.

[0004] In addition, during the construction of existing anchor rods, the centering and guiding construction of anchor rods (such as steel bars) is extremely important. In order to guide the anchor rods, a guide cap is set at the end of the anchor rod. The outer diameter of the existing guide cap is mostly fixed. During the anchor rod drilling process, the anchor rod drilling diameter is affected by the vibration of the drill rod, local collapse of the hole wall, deviation of the drilling hole from the axial direction, and the local small drilling diameter. As a result, the anchor rod drilling diameter is not uniform, and local expansion holes or cable holes, inclined holes, etc. are common. Therefore, when the anchor rod body with a fixed diameter guide cap is used for drilling below, the following engineering accidents are prone to occur: (1) The anchor rod body deviates from the axis, causing the steel bar axis to deviate from the anchor rod drilling axis, seriously affecting the force of the anchor rod steel bar and bringing greater safety hazards to the project; (2) At the shrinkage hole, the guide cap diameter is larger than the drilling hole diameter, and the anchor rod body cannot pass through the shrinkage hole section, resulting in the anchor rod body being unable to be placed in the drilling hole, seriously affecting the construction period. In addition, for the tension-compression composite anti-floating anchor, the slurry in the tension anchoring section is prone to micro-cracks due to tension, and groundwater and corrosive media can easily penetrate into the cement slurry through the cracks, causing the fine-rolled threaded steel to rust, affecting its durability; and the anchor heads of the anti-floating anchors are mostly buried in the structural layer. Applying prestress to the anti-floating anchor can significantly improve the stress-bearing performance of the structural layer and its connecting structure. However, it is currently very difficult to apply prestress to the anti-floating anchor, which seriously hinders the application of prestressed anti-floating anchors.

[0005] In view of this, the inventor conducted in-depth research on the above-mentioned issues, and thus the present case was produced. Summary of the invention

[0006] The purpose of the present invention is to provide a prestressed tension-compression composite anti-floating anchor rod which can improve the anti-corrosion performance, has a more stable structure and is convenient for construction. Another purpose of the present invention is to propose a construction method of the prestressed tension-compression composite anti-floating anchor rod, which can not only facilitate the application of prestress to the anti-floating anchor rod, but also greatly shorten the construction period.

[0007] In order to achieve the above object, the present invention adopts such technical solution:

[0008] A prestressed tension-compression composite anti-floating anchor comprises an anchor rod body, on which a first cylindrical pressure plate, a grease strip and an anti-corrosion casing are arranged, the anchor rod body forms a pressure-bearing anchoring section and a tension-bearing anchoring section on the upper and lower sides of the first cylindrical pressure plate respectively, the grease strip is wrapped around the anchor rod body, the anti-corrosion casing is sleeved outside the grease strip, and further comprises a sealing cylinder arranged on the top of the anchor rod body, a simple jack and a second cylindrical pressure plate are sleeved on the anchor rod body in the sealing cylinder, and the sealing cylinder is provided with a lower grouting pipe and an upper exhaust pipe connected to the outside.

[0009] As a preferred embodiment of the present invention, the sealing cylinder includes a U-shaped cylinder and a U-shaped cover plate threadedly connected to the U-shaped cylinder. A pressure plate is provided on the oil top of the simple jack, and the pressure plate is arranged corresponding to the second cylinder-type pressure plate. An oil inlet pipe is connected to the simple jack, and the oil inlet pipe extends out of the sealing cylinder. An oil stop valve is provided at the position where the oil inlet pipe extends out of the sealing cylinder.

[0010] As a preferred embodiment of the present invention, the anchor rod body adopts fine-rolled threaded steel and also includes a guide cap arranged on the end of the anchor rod body, the guide cap includes a guide curved plate, a curved reducing strip, a rib plate and a connecting tube, the outer wall of the guide curved plate is a curved hemispherical shape, the curved reducing strip is a curved noodle shape, the guide curved plate and the curved reducing strip are connected as a whole to form a curved profile, the connecting tube is arranged in the guide curved plate, and the inner wall of the connecting tube is provided with a fourth internal screw used in conjunction with the anchor rod body, and the connecting tube and the guide curved plate are connected by the rib plate.

[0011] As a preferred embodiment of the present invention, it also includes a first friction-enhancing plate and a second friction-enhancing plate sleeved in the anchor rod body, and the first friction-enhancing plate and the second friction-enhancing plate are both arranged between the first cylindrical pressure plate and the guide cap.

[0012] As a preferred embodiment of the present invention, the first friction enhancing plate and the second friction enhancing plate both include an annular panel and a screw barrel, the screw barrel is screwed onto the anchor rod body, and the side of the panel of the second friction enhancing plate is further provided with a bracket leg.

[0013] As a preferred embodiment of the present invention, the first cylinder-type pressure plate includes an annular first pressure plate, a first inner screw cylinder, and a reinforcing rib connecting the annular first pressure plate and the first inner screw cylinder, and the second cylinder-type pressure plate includes an annular second pressure plate, a first inner screw cylinder, and a reinforcing rib connecting the annular second pressure plate and the first inner screw cylinder.

[0014] As a preferred embodiment of the present invention, it also includes tensile steel bars. A first through-bar hole is opened on the first cylindrical pressure plate, and a second through-bar hole is opened on the support leg of the second friction-enhancing plate. The tensile steel bars are inserted into the first through-bar hole and the second through-bar hole and extend to the guide cap.

[0015] As a preferred embodiment of the present invention, a connection groove is provided on the rib plate of the guide cap, and the end of the tensioned steel bar is inserted into the connection groove.

[0016] As a preferred embodiment of the present invention, there are multiple tensile steel bars, and the multiple tensile steel bars are evenly arranged along the circumference of the anchor rod body.

[0017] As a preferred embodiment of the present invention, the tensioned steel bar passes through the first cylindrical pressure plate and extends toward the second cylindrical pressure plate, and the extension length is 2 to 5 times the diameter of the anchor hole.

[0018] The present invention also proposes a construction method of a prestressed tension-compression composite anti-floating anchor rod, comprising the following construction steps:

[0019] A. Assembly and construction of components in the pressure-bearing anchoring section

[0020] The first cylindrical pressure plate is screwed into the finished rolled threaded steel bar, and the first pressure plate is directed toward the top of the finished rolled threaded steel bar, and the first cylindrical pressure plate is rotated and moved to the designed position; starting from the first pressure plate, the grease strip is continuously wound on the surface of the anchor rod body toward the top of the anchor rod body in sequence, and the grease strip is wound to the designed position of the second cylindrical pressure plate, and the anti-corrosion sleeve is sleeved on the anchor rod body corresponding to the grease strip;

[0021] B. Assembly construction of components in the tension anchoring section

[0022] From the bottom end of the finished rolled threaded steel bar, the first friction-enhancing plate and the second friction-enhancing plate are screwed and inserted into the tension anchoring section of the finished rolled threaded steel bar in sequence, and the panel is directed toward the top of the finished rolled threaded steel bar, and the first friction-enhancing plate and the second friction-enhancing plate are screwed and moved to the designed position according to the designed spacing;

[0023] C. Assembly of guide cap

[0024] Insert the connecting tube of the guide cap into the bottom end of the finely rolled threaded steel bar; fine-tune the second friction-enhancing plate and the first cylindrical pressure-bearing plate so that the first reinforcement hole and the second reinforcement hole correspond to the connecting groove of the guide cap, insert the tensile steel bar through the first reinforcement hole of the first cylindrical pressure-bearing plate, and sequentially pass through the second reinforcement hole of the second friction-enhancing plate until it is inserted into the connecting groove of the guide cap;

[0025] D. Sealing tube assembly construction

[0026] Insert the sealing ring and the U-shaped cylinder to the designed position on the top of the fine-rolled threaded steel bar, then install the simple jack and the second cylinder-type pressure plate in turn at the bottom of the U-shaped cylinder, and lower the oil top of the simple jack to the lowest position. The second cylinder-type pressure plate presses against the oil top, and the oil inlet pipe and the lower grouting pipe of the simple jack are connected to the top surface of the exposed structural layer through the transfer interface set on the U-shaped cylinder in turn; then screw the U-shaped cover plate into the top of the U-shaped cylinder, and connect the upper exhaust pipe to the top surface of the exposed structure;

[0027] E. Structural layer construction

[0028] Tie up the steel bars in the structural layer, fix the sealing tube with the steel bars, and then pour concrete into the structural layer;

[0029] F. Prestressed tension

[0030] After the concrete strength of the structural layer is cured to the design requirements, use an oil pump to pressurize hydraulic oil into the simple jack through the oil inlet pipe. When the oil pressure reaches the pressure value calibrated by the designed prestressing, close the oil stop valve and inject cement slurry into the sealing tube through the lower grouting pipe at the same time. When the cement slurry continuously overflows from the upper exhaust pipe, stop grouting. When the cement slurry strength is cured to meet the design requirements, clear the exposed lower grouting pipe, upper exhaust pipe and oil inlet pipe.

[0031] The technical solution of the present invention has the following advantages:

[0032] (1) Solved the problem of applying prestress to anti-floating anchor rods. The contradiction between the concrete pouring of the structural layer and the prestressing caused by the existing construction process was solved by pre-embedded sealing tubes. That is, prestressing requires concrete as a force transmission component, and the pouring of concrete will bury the anchor head device set in the structural layer.

[0033] (2) The convenient construction of the prestressed anti-floating anchor rod is realized. By placing the anchor head inside the sealing cylinder, the concrete of the structural layer can be poured at one time; at appropriate construction nodes, the simple jack in the sealing cylinder can be used to apply a lifting force to the anti-floating anchor rod fine-rolled threaded steel bar according to the design requirements to achieve the tensioning of the anchor rod prestress, that is, the oil pump is connected to the oil inlet nozzle to pump hydraulic oil into the simple jack to drive the oil top to lift upward, and the pressure plate pushes the second cylinder-type pressure plate upward. Since the second cylinder-type pressure plate is firmly screwed to the fine-rolled threaded steel bar, the fine-rolled threaded steel bar is stretched at this time, and the structural layer is in a downward compression state due to the reaction force of the simple jack, so as to achieve the application of prestressed anti-floating anchor rod.

[0034] (3) Enhance the ability of underground structures to resist deformation. Since prestress is applied to the structural layer, when the difference between the buoyancy and the deadweight of the structure is less than the prestress, the structural layer will not deform upward; when the difference between the buoyancy and the deadweight is greater than the prestress, tensile stress will be generated at the top of the structural layer. Due to the application of prestress, the buoyancy required for the top of the structural layer to crack is much greater than the buoyancy value corresponding to the cracking of the top of the structural layer when no prestress is applied. Therefore, the prestress of the anti-floating anchor significantly enhances the ability of the structural layer to resist deformation, and can delay or even eliminate the cracking phenomenon.

[0035] (4) The cement slurry of the pressure anchoring section of the present invention is under pressure, and the anchor rod body adopts dual anti-corrosion measures of grease strips and anti-corrosion sleeves, and has good anti-corrosion performance. The tension anchoring section has a friction plate to strengthen the connection between the anchor rod body and the cement slurry, reduce interface slip deformation, and the tension steel bar can enhance the tensile bearing capacity of the cement slurry in the tension anchoring section, prevent the cement slurry from cracking, and greatly improve the anti-corrosion performance of the tension anchoring section. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a cross-sectional view of the construction completion of the first embodiment of the present invention.

[0037] Figure 2 It is a cross-sectional view of the first cylindrical pressure plate of the present invention.

[0038] Figure 3 It is a top view of the first cylindrical pressure plate of the present invention.

[0039] Figure 4 It is a bottom view of the first cylindrical pressure plate of the present invention.

[0040] Figure 5 For the present invention Figure 2 AA cross-section diagram.

[0041] Figure 6 For the present invention Figure 2 BB cross-section diagram.

[0042] Figure 7 For the present invention Figure 2 CC cross-section diagram.

[0043] Figure 8 It is a cross-sectional view of the second cylindrical pressure plate of the present invention.

[0044] Fig. 9 It is a top view of the second cylindrical pressure plate of the present invention.

[0045] Fig.10 It is a bottom view of the second cylindrical pressure plate of the present invention.

[0046] Fig.11 For the present invention Figure 8 DD cross-section diagram.

[0047] Fig.12 This is the assembly construction drawing of the first cylindrical pressure plate node of the present invention.

[0048] Fig.13 For the present invention Fig.12 EE cross-section diagram.

[0049] Fig.14 For the present invention Fig.12 FF cross-section diagram.

[0050] Fig.15 For the present invention Fig.12 GG cross-section diagram.

[0051] Fig.16 For the present invention Fig.12 HH cross-section diagram.

[0052] Fig.17 It is a cross-sectional view of the first friction-enhancing plate of the present invention.

[0053] Fig.18 For the present invention Fig.17 LL section view.

[0054] Fig.19 For the present invention Fig.17 MM cross-section diagram.

[0055] Fig. 20 It is a cross-sectional view of the second friction-enhancing plate of the present invention.

[0056] Fig.21 For the present invention Fig. 20 NN profile diagram.

[0057] Fig. 22 This is a connection diagram between the anchor rod body and the structural layer node of the present invention.

[0058] Fig.23 It is a cross-sectional view of the guide cap and the anchor rod body in the present invention.

[0059] Fig.24 For the present invention Fig.23 Cross-sectional view at OO.

[0060] Fig.25 For the present invention Fig.23 Cross-sectional view at PP.

[0061] Fig.26 For the present invention Fig.23 Cross-sectional view at QQ.

[0062] Fig. 27 For the present invention Fig.23 Cross-sectional view at RR.

[0063] Fig.28 This is a cross-sectional view of the completion of the concrete construction of the structural layer of the second embodiment of the present invention.

[0064] Fig.29 This is a cross-sectional view of the prestressed tensioning completion of the second embodiment of the present invention.

[0065] In the figure:

[0066] 100 first cylinder type pressure plate 101 first pressure plate 102 first inner screw cylinder

[0067] 103 reinforcing rib 104 first inner screw 105 first rib hole

[0068] 110 second cylindrical pressure plate 111 pressure plate 112 spiral reinforcement 113 second pressure plate

[0069] 120 sealing tube 121 U-shaped tube 122 end external screw

[0070] 123 U-type cover plate 124 second inner screw 125 perforation 126 sealing ring

[0071] 127 lower grouting pipe 128 upper exhaust pipe

[0072] 130 Simple jack 131 Oil cylinder 132 Oil top 133 Pressure plate

[0073] 134 oil inlet pipe 135 oil check valve

[0074] 200 fine rolled threaded steel 201 external thread 202 grease strip 203 anti-corrosion casing

[0075] 210 first friction plate 211 panel 212 screw barrel 213 third inner screw

[0076] 220 second friction plate 221 bracket leg 222 second reinforcement hole 223 tensile reinforcement

[0077] 230 water stop pipe 231 wing plate 232 round pipe 233 water-expandable rubber pipe

[0078] 240 cement slurry

[0079] 300 guide cap 301 guide curved plate 302 curved reducer strip

[0080] 303 rib plate 304 connecting tube 305 connecting groove 306 fourth inner screw

[0081] 310 anchor drilling

[0082] 400 structural layer 401 bottom steel bar 402 top steel bar 403 bent steel bar

[0083] 404 vertical stirrups 405 concrete 406 cushion DETAILED DESCRIPTION

[0084] In order to further explain the technical solution of the present invention, the following is a detailed description in conjunction with the embodiments. Figure 1-Figure 27 (In the embodiment, the anchor rod body is a fine-rolled threaded steel bar 200, and the figure only uses one fine-rolled threaded steel bar 200 as a rib body for illustration), the first embodiment of the present invention proposes a quick-assembly tension-compression composite anchor rod, which includes: fine-rolled threaded steel bar 200, a first cylindrical pressure plate 100, a first friction-enhancing plate 210, a second friction-enhancing plate 220, a grease strip 202, an anti-corrosion sleeve 203 and a guide cap 300. The guide cap 300 is arranged at the lower end of the fine-rolled threaded steel bar 200, and the structural layer 400 is arranged at the upper end of the fine-rolled threaded steel bar 200. The structural layer 400 includes a bottom steel bar 401, a top steel bar 402, a vertical stirrup 404 arranged between the bottom steel bar 401 and the top steel bar 402, and a bent steel bar 403 located at the top layer. A pressure plate 111 is provided on the bent steel bar 403. The pressure plate 111 is sleeved on the fine-rolled threaded steel bar 200 and locked on the bent steel bar 403 through a second cylindrical pressure plate 110.

[0085] In the present invention, the surface of the fine-rolled threaded steel 200 has an external thread 201, and the inner walls of the first cylindrical pressure plate 100, the second cylindrical pressure plate 110, the first friction plate 210, the second friction plate 220 and the guide cap 300 are all provided with internal screws used in conjunction with the external thread 201 of the fine-rolled threaded steel 200, and the first friction plate 210 and the second friction plate 220 are arranged at a spacing of 2-4m. The grease strip 202 is a felt belt for absorbing grease, and the grease strip 202 is continuously wound around the surface of the fine-rolled threaded steel 200 between the first cylindrical pressure plate 100 and the pressure plate 111, and the anti-corrosion sleeve 203 is provided on the outer surface of the grease strip 202. The water-expandable rubber tube 233 and the water stop tube 230 are sequentially provided on the outer side of the anti-corrosion sleeve 203 at the junction of the anchor rod body and the structural layer 400. The water-expandable rubber tube 233 is made of a well-known water-expandable rubber material. In the present invention, a spiral steel bar 112 is further provided below the pressure plate 111 below the second cylindrical pressure plate 110 .

[0086] Reference Figures 2 to 29 The second embodiment of the present invention proposes a prestressed tension-compression composite anti-floating anchor rod, which is different from the first embodiment in that it also includes a sealing cylinder 120 arranged at the top of the anchor rod body, and the sealing cylinder 120 is a cylindrical shape in which a U-shaped cylinder 121 and a U-shaped cover plate 123 are screwed into an internal cavity. Specifically, the outer wall of the U-shaped cylinder 121 is provided with an end outer screw 122, and the inner wall of the U-shaped cover plate 123 is provided with a second inner screw 124 that cooperates with the end outer screw 122. A simple jack 130 and a second cylindrical pressure plate 110 are mounted on the anchor rod body in the sealing cylinder 120, and a pressure plate 133 is provided on the oil top 132 of the simple jack 130. The pressure plate 133 is arranged corresponding to the second cylindrical pressure plate 110, and an oil inlet pipe is connected to the simple jack 130, and the oil inlet pipe 134 extends out of the sealing cylinder 120. An oil stop valve 135 is provided at the position where the oil inlet pipe 134 extends out of the sealing cylinder 120. The sealing cylinder 120 is provided with a lower grouting pipe 127 and an upper exhaust pipe 128 communicating with the outside.

[0087] In the first embodiment and the second embodiment of the present invention, the same structure is adopted when the following components are involved.

[0088] The first cylinder-type pressure plate 100 is composed of a first annular pressure plate 101, a first inner screw cylinder 102 and a reinforcing plate 103. The first pressure plate 101 is arranged at one end of the axial direction of the first inner screw cylinder 102 and is arranged perpendicular to the first inner screw cylinder 102. The inner wall of the first inner screw cylinder 102 is provided with a first inner screw 104 used in conjunction with the outer thread 201 of the fine-rolled threaded steel 200. The first pressure plate 101 of the first cylinder-type pressure plate 100 is provided with a first rib-piercing hole 105. The second cylinder-type pressure plate 110 is composed of a second annular pressure plate 113, a first inner screw cylinder 102 and a reinforcing plate 103. Preferably, the outer diameter of the first pressure plate 101 of the first cylinder-type pressure plate 100 is 40-100 mm smaller than the diameter of the anchor borehole 310. Preferably, the length of the first inner screw barrel 102 of the first barrel-type pressure plate 100 satisfies that the bite bearing capacity of the first inner screw 104 and the outer thread 201 of the finished rolled threaded steel bar 200 is not less than the tensile strength of the finished rolled threaded steel bar 200. Preferably, the first rib-piercing hole 105 is not provided on the second pressure plate 113 of the second barrel-type pressure plate 110. Preferably, the diameter of the first rib-piercing hole 105 is 7-16 mm.

[0089] The first friction-enhancing plate 210 is composed of a circular panel 211 and a screw barrel 212, and the second friction-enhancing plate 220 is composed of a circular panel 211, a screw barrel 212, a bracket leg 221 and a second rib-piercing hole 222. The panel 211 is arranged at one end of the screw barrel 212 along the axial direction and is arranged perpendicular to the screw barrel 212. The inner wall of the screw barrel 212 is provided with a third inner screw 213 used in conjunction with the external thread 201 of the finished rolled threaded steel 200. The bracket leg 221 is arranged around the outer side of the panel 211, and the bracket leg 221 is provided with the second rib-piercing hole 222. The number of the second rib-piercing holes 222 matches the number and spacing of the first rib-piercing holes 105 of the first cylindrical pressure plate 100. Preferably, the diameter of the panel 211 is 40-100 mm larger than the diameter of the finished rolled threaded steel 200. Preferably, the diameter of the second rib-piercing hole 222 is 7-16 mm. Preferably, the width of the support leg 221 is 15-25 mm.

[0090] The water stop pipe 230 is composed of a circular tube 232 and an annular wing plate 231 . The wing plate 231 is disposed at both ends of the circular tube 232 in the axial direction and is disposed perpendicular to the circular tube 232 .

[0091] Reference Figure 23-Figure 27(Only four curved reducing strips 302 are shown in the figure), the present invention proposes a self-reducing guide cap for an anchor rod, comprising a guide curved plate 301, a curved reducing strip 302, a rib plate 303, a connecting tube 304 and a connecting groove 305. The outer wall of the guide curved plate 301 is in the shape of a curved hemispherical surface, the curved reducing strip 302 is in the shape of a curved strip arranged around the axial direction of the guide cap, the guide curved plate 301 and the curved reducing strip 302 are connected as a whole, and the contour line is a curve, and the outer diameter of the contour line gradually increases along the top of the guide curved plate 301 toward the curved reducing strip 302. A connecting tube 304 is provided in the middle of the guide curved panel 301, and the connecting tube 304 is provided along the center line of the guide curved panel 301. The inner wall of the connecting tube 304 is provided with a fourth internal screw 306 used in conjunction with the external thread 201 on the surface of the fine-rolled threaded steel 200, specifically the fourth internal screw 306. The connecting tube 304 and the guide curved panel 301 are connected by the ribs 303. In the embodiment, four ribs 303 are shown.

[0092] Preferably, the maximum outer diameter of the guide curved plate 301 is 0.5-0.6 times the diameter of the anchor hole 4 , and the maximum outer diameter of the peripheral edge of the curved reducer strip 302 is 1.0-1.4 times the diameter of the anchor hole 10 .

[0093] Preferably, the width of the curved reducing strip 302 is 30-100 mm.

[0094] Preferably, the rib plate 303 is arranged between the connecting tube 304 and the guide curved plate 301 .

[0095] Preferably, the inner diameter of the connecting cylinder 304 is consistent with the outer diameter of the finished rolled threaded steel bar 200 , and the finished rolled threaded steel bar 200 can be directly screwed into the connecting cylinder 304 and tightly connected.

[0096] Preferably, a connecting groove 305 is provided on the rib plate 303, and the inner diameter of the connecting groove 305 is 7-16 mm.

[0097] Preferably, the number and spacing of the connection grooves 305 match those of the first rib penetration holes 105 .

[0098] Preferably, the height of the connecting tube 304 is 50-200 mm higher than the height of the rib plate 303 .

[0099] Preferably, the connecting groove 305, the second reinforcing bar hole 222 of the second friction-enhancing plate 220, and the first reinforcing bar hole 105 of the first cylindrical pressure plate 100 are provided with tensioned steel bars 223. The present invention provides a self-variable guide cap for tension-compression composite anchor, wherein the anchor rod body (finely rolled threaded steel bar 200) can be directly screwed into the connecting tube 304, and during the process of placing the anchor rod drilling hole 310 under the anchor rod body, the guide curved plate 301 can ensure that the finely rolled threaded steel bar 200 has a reliable protective layer thickness; when the construction causes the diameter of the anchor rod drilling hole 310 to change within a certain range, since the curved surface reducing strip 302 has good flexibility and the outer diameter of the curved surface reducing strip 302 is larger than the maximum outer diameter of the guide curved plate 301, it can be compressed or stretched in the radial direction of the diameter of the anchor rod drilling hole 310, and can well adapt to the change of the diameter of the anchor rod drilling hole 310, and always ensure that the finely rolled threaded steel bar 200 is in the middle position of the anchor rod drilling hole 310. The present invention has the characteristics of simple and reliable device, quick construction and strong adaptability. In the present invention, the tension steel bar 223 passes through the first reinforcement hole 105 of the first cylindrical pressure plate 100 and the second reinforcement hole 222 of the second friction-enhancing plate 220 in sequence, and then is inserted into the connecting groove 305 of the guide cap 300. The surface of the finely rolled threaded steel bar 200 between the first cylindrical pressure plate 100 and the pressure plate 111 below the second cylindrical pressure plate 110 is sequentially wrapped with a grease strip 202 and a sleeve 203 is provided. Since the design reference period of the anti-floating anchor rod is not lower than the building design reference period, which is generally not less than 50 years, in order to prevent the grouting body of the tension anchoring section from cracking due to tension, which then causes the anchor rod body to rust, thereby reducing durability and even endangering the safety of the anchoring project, the present invention also includes a tension steel bar 223 arranged in the grouting body of the tension anchoring section. The present invention directly opens a first reinforcement hole 105 on the first cylindrical pressure plate 100, and opens a second reinforcement hole 222 on the second friction increasing plate 220. The tension steel bar 223 is penetrated through the first reinforcement hole 105 and the second reinforcement hole 222 and extends to the connecting groove 305 of the guide cap 300.

[0100] Preferably, the top end of the tensioned steel bar 223 is exposed from the first pressure plate 101 of the first cylindrical pressure plate 100 , and the exposed height is 2-4 times the diameter of the anchor borehole 310 .

[0101] Corresponding to the first embodiment, the present invention proposes a construction method of a fast-assembly tension-compression composite anti-floating anchor rod, comprising the following construction steps:

[0102] A. Assembly and construction of components in the pressure-bearing anchoring section

[0103] Screw the first cylindrical pressure plate 100 onto the finished rolled threaded steel bar 200, and make the first pressure plate 101 face the top of the finished rolled threaded steel bar 200, and rotate and move the first cylindrical pressure plate 100 to the designed position; starting from the first pressure plate 101, successively and continuously wrap the grease strip 202 on the surface of the finished rolled threaded steel bar 200 toward the top of the finished rolled threaded steel bar 200, and stop at the position of the pressure plate 111 under the second cylindrical pressure plate 110; insert the anti-corrosion sleeve 203 over the entire length of the grease strip 202;

[0104] B. Assembly construction of components in the tension anchoring section

[0105] From the bottom end of the finished rolled threaded steel bar 200, screw the first friction-enhancing plate 210 and the second friction-enhancing plate 220 into the tension anchoring section of the finished rolled threaded steel bar 200 in sequence, and make the panel 211 point to the top of the finished rolled threaded steel bar 200, screw the first friction-enhancing plate 210 and the second friction-enhancing plate 220, and move them to the designed position according to the designed spacing;

[0106] C. Assembly of guide cap

[0107] Insert the connecting tube 304 of the guide cap 300 into the bottom end of the finely rolled threaded steel bar 200 until it is tight; fine-tune the second friction-enhancing plate 220 and the first cylindrical pressure-bearing plate 100 so that the first rib-penetrating hole 105 and the second rib-penetrating hole 222 correspond to the connecting groove 305 of the guide cap 300, insert the tensile steel bar 223 from the first rib-penetrating hole 105 of the first cylindrical pressure-bearing plate 100, and sequentially pass through the second rib-penetrating hole 222 of the second friction-enhancing plate 220 until it is inserted into the connecting groove 305;

[0108] D. Anchor head component assembly construction

[0109] Align the guide cap 300 with the center of the anchor borehole 310 and lower it to the designed depth, and pour cement slurry 240 into the anchor borehole 310; at the position of the anchor borehole 310 corresponding to the hole mouth of the anchor borehole 310 on the ground, insert the water-expandable rubber tube 233 and the water stop tube 230 in sequence from the top of the fine-rolled threaded steel bar 200; tie the bottom steel bar 401, the top steel bar 402, the bent steel bar 403 and the vertical stirrup 95 of the structural layer 400; insert the spiral steel bar 112, the pressure plate 111 and the second cylindrical pressure plate 110 in sequence from the top of the fine-rolled threaded steel bar 200, so that the second cylindrical pressure plate 110 is pressed against the pressure plate 111, and the pressure plate 111 is pressed against the bent steel bar 403, and the spiral steel bar 112 is fixed centered below the pressure plate 111;

[0110] E. Pouring and pouring construction

[0111] Pouring concrete 405 into the structural layer 400 completes the entire construction process of the tension-compression composite anti-floating anchor.

[0112] The invention discloses a fast-assembly tension-compression composite anchor rod and a construction method thereof. All parts are assembled without any welded parts. All parts can be mass-produced in a standardized manner, and the quality of all parts of the system can be effectively guaranteed. Since all parts are assembled, the construction is more convenient, and the construction period can be greatly saved. In the pressure-bearing anchor section, grease strips and anti-corrosion sleeves are used to provide double protection for the fine-rolled threaded steel bars. In the tension anchor section, tension steel bars are arranged around the fine-rolled threaded steel bars to improve the tensile bearing capacity of the cement slurry in the tension anchor section, avoid rusting of the fine-rolled threaded steel bars caused by cracking of the cement slurry, and significantly improve the anti-corrosion performance of the fine-rolled threaded steel bars, so that the fine-rolled threaded steel bars can be well adapted to permanent anchoring projects such as anti-floating anchor rods and slope support anchor rods.

[0113] Corresponding to the second embodiment, the present invention proposes a construction method of a prestressed tension-compression composite anti-floating anchor rod, comprising the following construction steps:

[0114] A. Assembly and construction of components in the pressure-bearing anchoring section

[0115] The first cylindrical pressure plate 100 is screwed into the finished rolled threaded steel bar 200, and the first pressure plate 101 is directed toward the top of the finished rolled threaded steel bar 200, and the first cylindrical pressure plate 100 is rotated and moved to the designed position; starting from the first pressure plate 101, the grease strip 202 is continuously wound on the surface of the anchor rod body toward the top direction of the anchor rod body in sequence, and the grease strip 202 is wound to the designed position of the second cylindrical pressure plate 110, and the anti-corrosion sleeve 203 is sleeved on the anchor rod body corresponding to the grease strip 202;

[0116] B. Assembly construction of components in the tension anchoring section

[0117] From the bottom end of the finished rolled threaded steel bar 200, screw the first friction-enhancing plate 210 and the second friction-enhancing plate 220 into the tension anchoring section of the finished rolled threaded steel bar 200 in sequence, and make the panel 211 point to the top of the finished rolled threaded steel bar 200, screw the first friction-enhancing plate 210 and the second friction-enhancing plate 220, and move them to the designed position according to the designed spacing;

[0118] C. Assembly of guide cap

[0119] Insert the connecting tube 304 of the guide cap 300 into the bottom end of the finely rolled threaded steel bar 200 until it is tight; fine-tune the second friction-enhancing plate 220 and the first cylindrical pressure-bearing plate 100 so that the first rib-penetrating hole 105 and the second rib-penetrating hole 222 correspond to the connecting groove 305 of the guide cap 300, insert the tensile steel bar 223 from the first rib-penetrating hole 105 of the first cylindrical pressure-bearing plate 100, and sequentially pass through the second rib-penetrating hole 222 of the second friction-enhancing plate 220 until it is inserted into the connecting groove 305;

[0120] D. Sealing tube assembly construction

[0121] Insert the sealing ring 126 and the U-shaped cylinder 121 to the designed position on the top of the fine-rolled threaded steel bar 200, then install the simple jack 130 and the second cylinder-type pressure plate 110 in sequence at the bottom of the U-shaped cylinder 121, and lower the oil top 132 of the simple jack 130 to the lowest position, and press the second cylinder-type pressure plate 110 against the oil top 132, and connect the oil inlet pipe 134 and the lower grouting pipe 127 of the simple jack 130 to the top surface of the exposed structural layer 400 through the adapter provided on the U-shaped cylinder 121 in sequence; then screw the U-shaped cover plate 123 into the top of the U-shaped cylinder 121, and connect the upper exhaust pipe 128 to the top surface of the exposed structure;

[0122] E. Structural layer construction

[0123] Tie up the steel bars in the structural layer 400, fix the sealing cylinder 120 with the steel bars, and then pour concrete 405 into the structural layer;

[0124] F. Prestressed tension

[0125] After the strength of the concrete 405 of the structural layer 400 is cured to the design requirements, an oil pump is used to pressurize hydraulic oil into the simple jack 130 through the oil inlet pipe 134. When the oil pressure reaches the pressure value calibrated by the designed prestressing, the oil stop valve 135 is closed, and at the same time, cement slurry 240 (specifically, cement slurry with a water-cement ratio of 0.45-0.6 can be used) is injected into the sealing tube 123 through the lower grouting pipe 127 until the cement slurry 240 continuously overflows from the upper exhaust pipe 128, and the grouting is stopped; when the strength of the cement slurry 240 is cured to meet the design requirements, the exposed lower grouting pipe 127, upper exhaust pipe 128 and oil inlet pipe 134 are cleared.

[0126] The product form of the present invention is not limited to the embodiments of this case. Any appropriate changes or modifications made by anyone with similar ideas should be deemed to be within the patent scope of the present invention.

Claims

1. A prestressed tension-compression composite anti-floating anchor, comprising an anchor rod body, characterized in that: A first cylindrical pressure plate, a grease strip and an anti-corrosion sleeve are arranged on the anchor rod body, and a pressure anchoring section and a tension anchoring section are formed on the upper and lower sides of the first cylindrical pressure plate of the anchor rod body respectively. The grease strip is wound around the anchor rod body, and the anti-corrosion sleeve is sleeved outside the grease strip. It also includes a sealing cylinder arranged on the top of the anchor rod body, and a simple jack and a second cylindrical pressure plate are sleeved on the anchor rod body in the sealing cylinder. The sealing cylinder is provided with a lower grouting pipe and an upper exhaust pipe connected to the outside; The sealing cylinder comprises a U-shaped cylinder and a U-shaped cover plate threadedly connected to the U-shaped cylinder. A pressure plate is provided on the oil top of the simple jack, and the pressure plate is arranged corresponding to the second cylinder-type pressure plate. An oil inlet pipe is connected to the simple jack, and the oil inlet pipe extends out of the sealing cylinder. An oil stop valve is provided at the position where the oil inlet pipe extends out of the sealing cylinder. The first cylinder-type pressure plate includes a first annular pressure plate, a first inner screw cylinder, and a reinforcing rib connecting the first annular pressure plate and the first inner screw cylinder. The second cylinder-type pressure plate includes a second annular pressure plate, a first inner screw cylinder, and a reinforcing rib connecting the second annular pressure plate and the first inner screw cylinder.

2. A prestressed tension-compression composite anti-floating anchor as claimed in claim 1, characterized in that: The anchor rod body is made of fine-rolled threaded steel and also includes a guide cap arranged on the end of the anchor rod body, the guide cap includes a guide curved plate, a curved reducing strip, a rib plate and a connecting tube, the outer wall of the guide curved plate is a curved hemispherical shape, the curved reducing strip is a curved noodle shape, the guide curved plate and the curved reducing strip are connected as a whole and form a hemispherical outer contour, the connecting tube is arranged in the guide curved plate, and the inner wall of the connecting tube is provided with a fourth internal screw used in conjunction with the anchor rod body, and the connecting tube and the guide curved plate are connected by the rib plate.

3. A prestressed tension-compression composite anti-floating anchor as claimed in claim 2, characterized in that: It also includes a first friction-enhancing plate and a second friction-enhancing plate sleeved in the anchor rod body, and the first friction-enhancing plate and the second friction-enhancing plate are both arranged between the first cylindrical pressure-bearing plate and the guide cap.

4. A prestressed tension-compression composite anti-floating anchor as claimed in claim 3, characterized in that: The first friction-enhancing plate and the second friction-enhancing plate both include an annular panel and a screw barrel, the screw barrel is screwed onto the anchor rod body, and the side surface of the panel of the second friction-enhancing plate is also provided with a bracket leg.

5. A prestressed tension-compression composite anti-floating anchor as claimed in claim 4, characterized in that: It also includes tensile steel bars. A first through-bar hole is opened on the first cylindrical pressure plate, and a second through-bar hole is opened on the support leg of the second friction-enhancing plate. The tensile steel bars are inserted into the first through-bar hole and the second through-bar hole and extend to the guide cap.

6. A prestressed tension-compression composite anti-floating anchor as claimed in claim 5, characterized in that: The rib plate of the guide cap is provided with a connection groove, and the end of the tensioned steel bar is inserted into the connection groove. There are multiple tensioned steel bars, and the multiple tensioned steel bars are evenly arranged along the circumference of the anchor rod body.

7. A prestressed tension-compression composite anti-floating anchor as claimed in claim 6, characterized in that: The tensile steel bars pass through the first cylindrical pressure plate and extend toward the second cylindrical pressure plate, and the extension length is 2 to 5 times the diameter of the anchor hole.

8. The construction method of the prestressed tension-compression composite anti-floating anchor rod according to claim 7, characterized in that: The construction steps include: A. Assembly and construction of pressure-bearing anchoring section components The first cylindrical pressure plate is screwed into the finished rolled threaded steel bar, and the first pressure plate is directed toward the top of the finished rolled threaded steel bar, and the first cylindrical pressure plate is rotated and moved to the designed position; starting from the first pressure plate, the grease strip is continuously wound on the surface of the anchor rod body toward the top of the anchor rod body in sequence, and the grease strip is wound to the designed position of the second cylindrical pressure plate, and the anti-corrosion sleeve is sleeved on the anchor rod body corresponding to the grease strip; B. Assembly construction of tension anchoring section components From the bottom end of the finished rolled threaded steel bar, the first friction-enhancing plate and the second friction-enhancing plate are screwed and inserted into the tension anchoring section of the finished rolled threaded steel bar in sequence, and the panel is directed toward the top of the finished rolled threaded steel bar, and the first friction-enhancing plate and the second friction-enhancing plate are screwed and moved to the designed position according to the designed spacing; C. Assembly of guide cap Insert the connecting tube of the guide cap into the bottom end of the finely rolled threaded steel bar; fine-tune the second friction-enhancing plate and the first cylindrical pressure-bearing plate so that the first reinforcement hole and the second reinforcement hole correspond to the connecting groove of the guide cap, insert the tensile steel bar through the first reinforcement hole of the first cylindrical pressure-bearing plate, and sequentially pass through the second reinforcement hole of the second friction-enhancing plate until it is inserted into the connecting groove of the guide cap; D. Sealing cylinder assembly construction Insert the sealing ring and the U-shaped cylinder to the designed position on the top of the fine-rolled threaded steel bar, then install the simple jack and the second cylinder-type pressure plate in turn at the bottom of the U-shaped cylinder, and lower the oil top of the simple jack to the lowest position. The second cylinder-type pressure plate presses against the oil top, and the oil inlet pipe and the lower grouting pipe of the simple jack are connected to the top surface of the exposed structural layer through the transfer interface set on the U-shaped cylinder in turn; then screw the U-shaped cover plate into the top of the U-shaped cylinder, and connect the upper exhaust pipe to the top surface of the exposed structure; E. Structural layer construction Tie up the steel bars in the structural layer, fix the sealing tube with the steel bars, and then pour concrete into the structural layer; F. Prestressing After the concrete strength of the structural layer is cured to the design requirements, use an oil pump to pressurize hydraulic oil into the simple jack through the oil inlet nozzle. When the oil pressure reaches the pressure value calibrated by the designed prestressing, close the oil stop valve and simultaneously inject cement slurry into the sealing cylinder through the lower grouting pipe until the upper exhaust pipe continuously overflows with cement slurry and the grouting is stopped. When the cement slurry strength is cured to meet the design requirements, clear the exposed lower grouting pipe, upper exhaust pipe and oil inlet pipe.

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