Recyclable anchor core and drainage anchor rod and construction method thereof

Abstract

The application discloses a recyclable anchor core and drainage anchor rod and a construction method thereof, and relates to the field of foundation engineering, and solves the problems of low anchoring force, unrecyclable anchor core or high recycling difficulty of the existing drainage anchor rod. The technical scheme adopted by the application is as follows: the recyclable anchor core and drainage anchor rod comprises an anchoring section, a front water-permeable section and a rear water-permeable section at the front end and the rear end of the anchoring section, the front water-permeable section comprises a front pipe body, the front pipe body is water-permeable, the front end of the anchoring section is a bearing plate, the front and rear plate surfaces of the bearing plate are connected with the front pipe body and a rear connecting pipe respectively, the rear connecting pipe is connected with a sleeve pipe, the front section pipe body of the sleeve pipe is water-impermeable and located in the anchoring section, the rear section pipe body of the sleeve pipe is provided with water-permeable holes and located in the rear water-permeable section; a front grout stopper is sleeved on the outer side of the rear connecting pipe, an anchor core is arranged in the sleeve pipe, the front end of the anchor core is connected with a clamping plate, the clamping plate is non-circular in the cross section perpendicular to the length direction of the anchor core, the bearing plate is provided with a connecting hole matched with the shape of the clamping plate, and the rear end of the anchor core is provided with an anchor head. The application is used for the design and construction of the anchor rod.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of foundation engineering, in particular to an anchor rod, and more particularly to a pressure type anchor rod with a recyclable anchor core and drainage, and a construction method of the pressure type anchor rod. BACKGROUND

[0002] Rainfall infiltration and groundwater level rise will reduce the slope shear strength and increase the sliding force, inducing slope instability, so anchoring and drainage are the main measures for slope support. Anchoring measures insert anchor bars into anchor holes, the anchor bars are anchor rods or anchor cables, and cement mortar is poured in the anchor holes, the slope, cement mortar and anchor bars are cemented together to improve the stability of the slope. Anchoring measures are widely used in landslide and dangerous rock control, chamber reinforcement, foundation anti-floating and foundation pit support engineering. For temporary and short-term projects, such as foundation pit support, after the foundation pit is backfilled, the anchor bars (anchor core) lose their function, and if the anchor core is not recycled, it is wasted. Drainage measures include slope drainage and slope drainage, slope drainage includes drainage ditches, water interception ditches, etc., and slope drainage includes blind trenches, water collection wells, drainage holes, etc. In engineering practice, the two drainage methods are reasonably combined according to the needs and site conditions.

[0003] Anchoring measures and drainage measures can be performed separately or combined. Currently, the methods for combining anchoring measures and drainage measures include the following two kinds: the first kind is to set a water permeable section in the middle of the anchor rod, which has the disadvantages that water in the deep part of the slope cannot be drained and the anchor core cannot be recycled, for example, see the first published texts with application numbers 201020521134.5, 201110119283.8 and 202211348730.1; the second kind is that the entire length of the anchor rod is a water permeable section or water permeable sections are arranged at intervals, which has the main disadvantages that the anchoring force of the water permeable section is insufficient, resulting in an increase in the depth and diameter of the anchor hole, and the anchor core cannot be recycled. The second method uses water permeable concrete to completely replace traditional impermeable concrete, for example, see the first published texts with application numbers 201610659558.X and 201510157530.1; it also includes using water permeable concrete to partially replace traditional impermeable concrete, for example, see the first published text with application number 201310383960.6; or by interval pouring of anchoring bodies to provide a channel for water collection and drainage of groundwater, for example, see the first published texts with application numbers 201910041638.2 and 201510157530.1.

[0004] The common pervious concrete is inferior to the traditional grouting material in fluidity and strength, so the pervious concrete is difficult to construct, the anchoring force of the solidified pervious concrete is low, and the diameter of the anchor hole needs to be very large to meet the stress requirement, for example, the first publication with the application number 201310383960.6 requires that the diameter of the anchor hole is 200mm-500mm, which is much larger than the diameter of the conventional anchor hole. If the pervious concrete mixed with high-strength cementing material is used, the cost is high. SUMMARY

[0005] The present application provides a recyclable anchor core and drainage anchor rod, which solves the problems of low anchoring force and difficult recycling of the existing drainable anchor rod.

[0006] The technical scheme adopted by the present application is as follows: a recyclable anchor core and drainage anchor rod, comprising an anchoring section, a front pervious section and a rear pervious section at the front and rear ends of the anchoring section, the front pervious section comprising a front pipe body, the front pipe body being a hollow structure with a closed front end and an open rear end, the front pipe body being made of a pervious material or being a pervious structure, the front end of the anchoring section being a bearing plate, the front plate surface of the bearing plate being fixedly connected to the rear end of the front pipe body, the diameter of the front pipe body being not greater than the diameter of the bearing plate, the rear plate surface of the bearing plate being fixedly connected with a rear connecting pipe and connected to the front end of a sleeve pipe, the outer diameters of the rear connecting pipe and the sleeve pipe being smaller than the diameter of the bearing plate, the front section of the sleeve pipe being non-pervious and located in the anchoring section, the rear section of the sleeve pipe being provided with pervious holes and located in the rear pervious section, the outer side of the rear section of the sleeve pipe being provided with a rear pipe body, the rear pipe body being made of a pervious material or being a pervious structure, the rear pipe body being a hollow structure with both ends open; the outer side of the rear connecting pipe is sleeved with a front grout stopper, the front grout stopper abuts against the bearing plate, the front grout stopper being made of a flexible material and fixedly connected to the bearing plate or the rear connecting pipe, the diameter of the front grout stopper being greater than the diameter of the bearing plate, the area surrounded by the rear end of the front grout stopper, the outer wall of the sleeve pipe and the front end of the rear pipe body being a grouting area; an anchor core capable of transmitting torque is arranged in the sleeve pipe, the front end of the anchor core is fixedly connected with a clamping plate, the clamping plate is non-circular in the cross section perpendicular to the length direction of the anchor core, and the projection of the clamping plate on the plane perpendicular to the length direction of the anchor core is located within the circular projection of the inner wall of the rear connecting pipe and the inner wall of the sleeve pipe, a connecting hole is arranged between the front plate surface and the rear plate surface of the bearing plate, the connecting hole connects the front pipe body and the sleeve pipe, the shape of the connecting hole is adapted to the shape of the clamping plate, and the rear end of the anchor core is connected with an anchor head for abutting against the rear end of the sleeve pipe and the rear pipe body.

[0007] In order to facilitate the connection of the front water permeable section and the bearing plate, reduce the cost of the front water permeable section and ensure the water permeability of the front water permeable section, further, the front plate surface of the bearing plate is fixed with a front connecting pipe, and the projection of the clamping plate is located within the circular projection of the front connecting pipe in the plane perpendicular to the length direction of the anchor core; the front pipe body includes an inner pipe and an outer pipe, the inner pipe is a metal pipe and the pipe body is provided with a water permeable hole, the rear end of the inner pipe is threadedly connected with the front connecting pipe, the front end of the outer pipe is conical and the rear end is open, the outer pipe is made of recycled material and is worn outside the inner pipe, and the outer surface of the outer pipe is covered with a front filter layer. The front filter layer plays a filtering role, for example, the front filter layer is a geotextile.

[0008] The anchor core is generally made of metal material, in order to avoid rust of the anchor core, further, a protection pipe is sleeved outside the anchor core, and corrosion-proof grease is filled between the anchor core and the protection pipe.

[0009] When grouting into the grouting area, the front grouting plug plays a role of avoiding the grout from permeating into the front water permeable section and blocking the front pipe body. Further, the front end surface of the front grouting plug abuts against the rear plate surface of the bearing plate, and the rear end surface of the front grouting plug is fastened by a locking ring, the locking ring is threadedly matched with the rear connecting pipe, or the locking ring abuts against the clamping block fixed to the outer periphery of the rear connecting pipe; the front grouting plug is a rubber plate, and the rubber plate is one layer or at least two layers.

[0010] In order to improve the airtightness of the grouting area, avoid the grout from permeating into the rear water permeable section to block the rear pipe body, and block the water permeable hole of the rear section pipe body of the sleeve pipe, further, the outer periphery of the junction between the front section pipe body and the rear section pipe body of the sleeve pipe is also provided with a rear grouting plug, the rear grouting plug is located at the rear end of the grouting area and abuts against the front end of the rear pipe body; the outer surface of the rear pipe body is covered with a rear filter layer. The rear filter layer plays a filtering role, for example, the rear filter layer is a geotextile.

[0011] In order to optimize the stress between the clamping plate and the bearing plate, further, the clamping plate includes a columnar connecting part, the front end of the anchor core is fixedly connected to the center of one bottom surface of the connecting part, at least one blade is arranged on the outer periphery of the connecting part along the radial direction thereof, the outer edges of the blades are in circular arc shape and the centers of the circular arcs coincide and are located on the axis of the anchor core. For example, 2-4 blades are uniformly arranged on the outer periphery of the connecting part of the clamping plate, and the blades are the same.

[0012] In order to avoid the anchor core and the clamping plate from being excessively inserted into the connecting hole of the bearing plate, further, an axial limiting piece for avoiding the insertion of the anchor core into the connecting hole is fixed to the front end of the anchor core.

[0013] When the clamping plate is inserted into the connecting hole, the anchor core needs to be rotated, and after the clamping plate is inserted into the connecting hole, the anchor core also needs to be rotated, and the effect of rotating the anchor core is to adjust the orientation of the clamping plate relative to the connecting hole. In order to facilitate the control of the orientation of the clamping plate relative to the connecting hole, the clamping plate cannot be continuously rotated after being rotated to a predetermined position, and further, the bearing plate is provided with a ring-shaped limiting piece in abutting cooperation with the clamping plate, and when the clamping plate abuts against the ring-shaped limiting piece, the clamping plate is aligned with the connecting hole or the clamping plate is misaligned with the connecting hole.

[0014] The application also provides a construction method for the construction of any of the "recyclable anchor core and drainage anchor rod", which also solves the problems of low anchoring force of the existing drainage anchor rod and the difficulty of recycling the anchor core. The construction method of the recyclable anchor core and drainage anchor rod comprises the following steps:

[0015] S1, drilling an anchor hole and cleaning the hole.

[0016] S2, taking out the rear pipe body of any of the "recyclable anchor core and drainage anchor rod" from the rear end of the casing pipe and inserting it into the anchor hole.

[0017] S3, grouting the grouting area.

[0018] S4, inserting the rear pipe body between the anchor hole and the casing pipe, and then installing the anchor head.

[0019] S5, when recycling the anchor core, rotating the anchor core, taking out and recycling the clamping plate and the anchor core.

[0020] The anchor hole penetrates the sliding surface or the potential sliding surface, and in order to enable the rear water-permeable section to effectively drain water, further, the anchor hole penetrates the sliding surface or the potential sliding surface, and the sliding surface and the potential sliding surface are located in the rear water-permeable section.

[0021] The beneficial effects of the present application are: the front pipe body of the hollow structure, the connecting hole of the bearing plate and the sleeve are communicated and form a drainage channel, the front water permeable section is used to drain the underground water at the hole bottom position, and the underground water inside the rock-soil (slope) body or outside the tunnel loose circle; the rear water permeable section is used to drain the underground water close to the hole position, and the underground water inside the sliding surface, the potential sliding surface and the tunnel loose circle, so that the drainage effect of the anchor rod is good, and the slope stability can be improved. The anchoring section only bears the anchoring effect and does not bear the drainage effect, the anchoring section is easy to construct, and the length of the anchoring section can be flexibly adjusted, so that the anchoring section can provide sufficient anchoring force. The shape of the connecting hole of the bearing plate is matched with the shape of the clamping plate, and after the clamping plate is aligned with the connecting hole, the clamping plate can pass through the connecting hole. The clamping plate is non-circular in the cross section perpendicular to the length direction of the anchor core, and after the clamping plate is misaligned with the connecting hole, the clamping plate cannot pass through the connecting hole; after the clamping plate passes through the connecting hole forwardly, the anchor core is rotated to misalign the clamping plate with the connecting hole, at this time, the connection between the anchor core and the bearing plate is realized and the tension can be transmitted, and the anchor core is rotated again to align the clamping plate with the connecting hole, so that the clamping plate can pass through the connecting hole backwardly, and the anchor core and the bearing plate are disconnected, and then the anchor core is recycled. The recyclable anchor core and the drainage anchor rod structure is simple, easy to manufacture, low in manufacturing difficulty and cost, the installation and recycling of the anchor core is convenient, the recycling success rate of the anchor core is high and the damage rate is low, and the recycled anchor core can be repeatedly used. The construction method of the recyclable anchor core and the drainage anchor rod is not much different from the construction process and construction technology of the traditional anchor rod, the construction process is simple, the construction quality is easy to control, no separate facilities for draining the slope are needed, and the construction period is saved. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structural schematic diagram of an embodiment of the recyclable anchor core and the drainage anchor rod of the present application.

[0023] Figure 2 is Figure 1 is a schematic diagram of the cooperation relationship between the clamping plate and the bearing plate in the embodiment shown.

[0024] Figure 3 is Figure 1 is a structural schematic diagram of the locking ring in the embodiment shown.

[0025] Reference signs: front water permeable section L1, anchoring section L2, rear water permeable section L3, front pipe body 1, inner pipe 1-1, outer pipe 1-2, front filter layer 1-3, bearing plate 2-1, rear connecting pipe 2-2, sleeve 2-3, front grout stopper 2-4, grouting area 2-5, anchor core 2-6, clamping plate 2-7, connecting part 2-7-1, blade 2-7-2, front connecting pipe 2-8, protection pipe 2-9, locking ring 2-10, clamping block 2-11, rear grout stopper 2-12, axial limiting part 2-13, ring limiting part 2-14, rear pipe body 3-1, rear filter layer 3-2, anchor head 4. DETAILED DESCRIPTION

[0026] The invention will now be further described with reference to the accompanying drawings.

[0027] The first subject of this invention is an anchor bolt with a recyclable anchor core and drainage. For example... Figure 1 As shown, the recyclable anchor core and drainage anchor bolt includes an anchoring section L2, and two permeable sections L1 and L3 at the front and rear ends of the anchoring section L2. The front end is the first end to enter the anchor hole when the anchor bolt is inserted, and the rear end is the last end to enter the anchor hole. The permeable section L1 includes a front tube 1, which is a hollow structure with a closed front end and an open rear end. The front tube 1 is made of permeable material or has a permeable structure, allowing groundwater at the bottom of the anchor hole to permeate into the front tube 1. The front tube 1 can be a single-layer structure or a multi-layer structure with at least two layers. See, for example, [example not provided]. Figure 1 The front pipe body 1 includes an inner pipe 1-1 and an outer pipe 1-2. The inner pipe 1-1 is a metal pipe with permeable holes, such as a steel pipe or a rust-proofed iron pipe. Alternatively, the inner pipe 1-1 can be a non-metallic pipe with permeable holes, such as a PVC pipe. The rear end of the inner pipe 1-1 has a connector for connecting to the anchoring section L2, such as a threaded connector. The front end of the outer pipe 1-2 is closed, and the rear end is open. The outer pipe 1-2 is made of permeable material and passes through the outside of the inner pipe 1-1, for example, made of recycled material, ensuring both permeability and environmental friendliness. The outer pipe 1-2 is generally a prefabricated component and fixed to the outside of the inner pipe 1-1, making them a single unit before assembly. To prevent silt from clogging the outer pipe 1-2, a pre-filter layer 1-3 can be wrapped around its outer surface. The pre-filter layer 1-3 acts as a filter, for example, it can be made of geotextile. When the anchor bolt is inserted into the anchor hole, the front permeable section L1 is inserted into the anchor hole first. To facilitate construction, the front end of the outer pipe 1-2 is conical, usually conical, but can also be pyramidal.

[0028] The front end of the anchoring section L2 is a bearing plate 2-1, and the rear end of the permeable section L1 is directly fixed to the front surface of the bearing plate 2-1. To facilitate the connection between the permeable section L1 and the bearing plate 2-1, a front connecting pipe 2-8 is fixed to the front surface of the bearing plate 2-1. For example, the front connecting pipe 2-8 is welded to the bearing plate 2-1, and the inner pipe 1-1 of the front pipe body 1 is threadedly connected to the front connecting pipe 2-8. The diameter of the bearing plate 2-1 is adapted to the diameter of the anchor hole. To facilitate the smooth insertion of the front pipe body 1, the diameter of the front pipe body 1 is not greater than the diameter of the bearing plate 2-1, and the diameter of the front pipe body 1 is generally slightly smaller than the diameter of the bearing plate 2-1.

[0029] The rear connecting pipe 2-2 is fixedly connected to the rear plate surface of the bearing plate 2-1, for example, the front end of the rear connecting pipe 2-2 is welded to the rear plate surface of the bearing plate 2-1. The rear end of the rear connecting pipe 2-2 is connected to the front end of the sleeve 2-3, for example, the rear connecting pipe 2-2 and the sleeve 2-3 are threaded together. The sleeve 2-3 plays an isolation role during grouting, and after grouting, the sleeve 2-3 becomes a major component of the drainage channel. The sleeve 2-3 is generally a metal pipe or a non-metal pipe, such as a seamless thin steel pipe or a PVC pipe. The outer diameters of both the rear connecting pipe 2-2 and the sleeve 2-3 are smaller than the diameter of the bearing plate 2-1, and the center lines of the rear connecting pipe 2-2 and the sleeve 2-3 coincide. The diameter of the rear connecting pipe 2-2 is generally equal to the diameter of the sleeve 2-3, that is, the inner diameter of the rear connecting pipe 2-2 is equal to the inner diameter of the sleeve 2-3, and the outer diameter of the rear connecting pipe 2-2 is equal to the outer diameter of the sleeve 2-3. The casing 2-3 can be a single, complete pipe or composed of two or more sections connected in series. The casing 2-3 is divided into a front section and a rear section. The front section of the casing 2-3 is impermeable and located in the anchoring section L2. The rear section of the casing 2-3 has permeable holes and is located in the rear permeable section L3. The outer side of the front section of the casing 2-3 is the grouting zone 2-5. The outer side of the rear section of the casing 2-3 is provided with a rear casing 3-1, which is a hollow structure with open ends. The inner diameter of the rear casing 3-1 is slightly larger than the outer diameter of the casing 2-3, and the outer diameter of the rear casing 3-1 is no larger than the diameter of the anchor hole, but slightly smaller than the diameter of the anchor hole, to ensure that the rear casing 3-1 can be smoothly fitted into the casing 2-3. The rear pipe body 3-1 is made of permeable material or has a permeable structure, allowing groundwater near the anchor hole opening to permeate through the rear pipe body 3-1 and the rear section of the casing 2-3 into the interior of the casing 2-3. For example, the rear pipe body 3-1 is made of recycled material. The rear pipe body 3-1 is a prefabricated pipe fitting, which is directly inserted into the rear section of the casing 2-3 from the rear end during construction. To prevent silt from clogging the rear pipe body 3-1, the outer surface of the rear pipe body 3-1 can also be covered with a rear filter layer 3-2, which acts as a filter; for example, the rear filter layer 3-2 is made of geotextile.

[0030] A front grout stop plug 2-4 is fitted onto the outer side of the rear connecting pipe 2-2. The front grout stop plug 2-4 abuts against the bearing plate 2-1, meaning that the front end face of the front grout stop plug 2-4 abuts against the rear plate face of the bearing plate 2-1. The area enclosed by the rear end of the front grout stop plug 2-4, the outer wall of the sleeve 2-3, and the front end of the rear pipe 3-1 is the grouting zone 2-5. The function of the front grout stop plug 2-4 is to prevent grout from entering and clogging the front permeable section L1 when grouting is injected into the grouting zone 2-5. The diameter of the front grout stop plug 2-4 is larger than the diameter of the bearing plate 2-1, and is generally slightly larger than the diameter of the corresponding anchor hole. The front grout stop plug 2-4 is made of a flexible material, such as a rubber plate, a water bladder connected to a water injection pipe, or an air bladder connected to an air injection pipe. When the front stop plug 2-4 is a rubber plate, the rubber plate consists of one or at least two layers. For example, the front stop plug 2-4 consists of two layers of rubber plates with different thicknesses, namely a thin plate and a thick plate. The thin plate and the thick plate are bonded and fixed together. The thick plate directly abuts against the rear plate surface of the bearing plate 2-1. The diameter of the thick plate is smaller than that of the thin plate. The thick plate serves to support the thin plate, while the thin plate serves to seal.

[0031] The front stop plug 2-4 is fixed to the bearing plate 2-1 or the rear connecting pipe 2-2. The front stop plug 2-4 can be directly glued and fixed, that is, fixed by adhesive, or it can be fastened by the locking ring 2-10. For example, the rear connecting pipe 2-2 has external threads, and the locking ring 2-10 has matching internal threads. The locking ring 2-10 presses the front stop plug 2-4 against the rear plate surface of the bearing plate 2-1. As another example, the rear connecting pipe 2-2 has a ring of spaced-apart locking blocks 2-11 around its outer periphery, with at least two locking blocks. The locking ring 2-10 is annular and has a notch on its inner side corresponding to the locking blocks 2-11. The locking ring 2-10 and the locking ring 2-10 are successively inserted into the rear connecting pipe 2-2. By rotating the locking ring 2-10, the locking ring 2-10 presses the front stop plug 2-4 against the rear plate surface of the bearing plate 2-1. To improve the fixing effect of the locking ring 2-10, a bevel is provided between the notches of the locking ring 2-10. By adjusting the angle of rotation of the locking ring 2-10, the tightness of the locking ring 2-10 against the front stop plug 2-4 can be adjusted. See, for example... Figure 3 The outer periphery of the rear connecting pipe 2-2 is provided with two spaced-apart locking blocks 2-11, and the inner side of the locking ring 2-10 is provided with two notches corresponding to the locking blocks 2-11.

[0032] After the casing 2-3 is inserted into the anchor hole, the front stop plug 2-4 can ensure that the front end of the casing 2-3 is centered in the anchor hole, but it cannot guarantee that the rear end of the casing 2-3 is centered in the anchor hole, especially when grouting into the grouting zone 2-5, where the casing 2-3 is prone to tilting relative to the centerline of the anchor hole. To ensure that the centerline of the casing 2-3 coincides with the centerline of the anchor hole, at least one centering bracket is fixedly installed on the outer periphery of the casing 2-3. The centering bracket has gaps to avoid affecting the flow of grout, and the outer diameter of the centering bracket is adapted to the diameter of the anchor hole.

[0033] When the anchor hole is vertically downward or inclined downward, grout is injected directly into the grouting zone 2-5 from bottom to top. By controlling the grouting volume, it is possible to prevent grout from seeping into the permeable section L3 and clogging the rear pipe body 3-1, as well as the permeable holes of the rear section of the casing 2-3. When the anchor hole is horizontally arranged or inclined upward, it is necessary to prevent grout from clogging the permeable section L3. Therefore, a rear grout stop plug 2-12 can be installed on the outer periphery of the junction between the front and rear sections of the casing 2-3. The rear grout stop plug 2-12 is located between the anchoring section L2 and the permeable section L3, at the rear end of the grouting zone 2-5, and abuts against the front end of the rear pipe body 3-1. The rear grout stop plug 2-12 is made of flexible material, such as a rubber sheet, or a water bladder connected to a water injection pipe, or an air bladder connected to an air injection pipe. When the rear grout stop plug 2-12 is a rubber sheet, the rubber sheet is one layer or at least two layers. When the anchor holes are arranged horizontally or inclined upwards, the viscosity of the grout can be adjusted, and grout can be injected first and then the grout stop plug 2-1 can be placed.

[0034] An anchor core 2-6, capable of transmitting torque, is inserted inside the sleeve 2-3. The anchor core 2-6 primarily bears tensile force and is generally a solid rod-shaped object made of metal, such as a reinforcing bar or steel strand. While the anchor core 2-6 is typically made of metal, a protective tube 2-9 can be fitted over its outer side to prevent corrosion. Anti-corrosion grease is filled between the anchor core 2-6 and the protective tube 2-9. In addition to its rust-preventing function, the anti-corrosion grease also provides lubrication, facilitating the insertion of the anchor core 2-6 into the protective tube 2-9. For example, the anti-corrosion grease may be silicone oil or calcium-based grease, and the protective tube 2-9 may be a soft rubber tube.

[0035] The rear end of anchor core 2-6 is provided with an anchor head 4 for abutting against the rear ends of casing 2-3 and rear tube body 3-1. Anchor head 4 includes an anchor plate and an anchor bolt. After construction, anchor head 4 is located at the borehole opening, and the anchor plate abuts against the rear ends of casing 2-3 and rear tube body 3-1, as shown below. Figure 1As shown. A retaining plate 2-7 is fixedly connected to the front end of anchor core 2-6. Retaining plate 2-7 is used to connect to bearing plate 2-1, and after connection, anchor core 2-6 can be rotated to detach them. A connecting hole is provided between the front and rear surfaces of bearing plate 2-1, connecting the front tube 1 and sleeve 2-3, with the axes of the front tube 1, bearing plate 2-1, and sleeve 2-3 coinciding. Retaining plate 2-7 is non-circular in cross-section perpendicular to the length of anchor core 2-6. The shape of the connecting hole matches the shape of retaining plate 2-7. When retaining plate 2-7 is aligned with the connecting hole, it can pass through the connecting hole; when misaligned, it cannot pass through. Retaining plate 2-7 can pass through sleeve 2-3, connecting tube 2-2, and the connecting hole; therefore, the size of retaining plate 2-7 is smaller than the size of sleeve 2-3 and sleeve 2-2. On a plane perpendicular to the length of anchor core 2-6, the projection of clamping plate 2-7 lies within the circular projection of the inner wall of sleeve 2-3. When the front connecting pipe 2-8 is fixed to the front plate surface of bearing plate 2-1, clamping plate 2-7 can also pass through the front connecting pipe 2-8. Therefore, on a plane perpendicular to the length of anchor core 2-6, the projection of clamping plate 2-7 lies within the circular projection of the front connecting pipe 2-8.

[0036] The following describes a connection structure between a clamping plate 2-7 and a bearing plate 2-1. The clamping plate 2-7 includes a columnar connecting portion 2-7-1. The front end of the anchor core 2-6 is fixedly connected to the center of a bottom surface of the connecting portion 2-7-1, for example, by welding. At least one blade 2-7-2 is provided radially along the outer periphery of the connecting portion 2-7-1. The outer edges of each blade 2-7-2 are arc-shaped, and the corresponding centers of each arc coincide and lie on the axis of the anchor core 2-6. The number of blades 2-7-2 is generally 2 to 4, and the blades 2-7-2 are preferably identical and distributed at equal central angles. See, for example, [example not provided]. Figure 1 and Figure 2 Two blades 2-7-2 are provided radially on the outer periphery of the connecting part 2-7-1, and the two blades 2-7-2 are arranged along the diameter direction of the connecting part 2-7-1. The diameter of the blades 2-7-2 is smaller than the inner diameter of the sleeve 2-3 and the inner diameter of the sleeve 2-3.

[0037] The retaining plate 2-7 at the front end of the anchor core 2-6 is inserted from back to front into the connecting hole of the bearing plate 2-1. Then, the anchor core 2-6 is rotated to misalign the retaining plate 2-7 with the connecting hole, thus connecting the anchor core 2-6 to the bearing plate 2-1. The anchor core 2-6 is then rotated again to align the retaining plate 2-7 with the connecting hole, allowing the retaining plate 2-7 to be removed from the connecting hole from back to front, thereby enabling the retrieval of the anchor core 2-6. To prevent the anchor core 2-6 and retaining plate 2-7 from excessively inserting into the connecting hole of the bearing plate 2-1, an axial limiting member 2-13 is fixed at the front end of the anchor core 2-6 to prevent insertion into the connecting hole. For example, the axial limiting member 2-13 is fixedly installed at the front end of the anchor core 2-6 near the retaining plate 2-7. The axial limiting member 2-13 is annular, and the outer diameter of the annulus is larger than the diameter of the circular portion of the connecting hole. For example, the axial limiting component 2-13 is made by cutting a steel plate with a thickness of 5mm, and the distance between the axial limiting component 2-13 and the clamping plate 2-7 is 5mm.

[0038] To facilitate control of the orientation of the clamping plate 2-7 relative to the connecting hole, and to prevent the clamping plate 2-7 from rotating further after reaching a predetermined position, the support plate 2-1 is also provided with a circumferential limiting member 2-14 that abuts against the clamping plate 2-7. When the clamping plate 2-7 abuts against the circumferential limiting member 2-14, the clamping plate 2-7 is aligned with the connecting hole, or misaligned with the connecting hole. The circumferential limiting member 2-14 can be provided on the front plate surface of the support plate 2-1, or on the rear plate surface of the support plate 2-1, or simultaneously on both the front and rear plate surfaces of the support plate 2-1. The circumferential limiting member 2-14 can be columnar, block-shaped, or other shapes. There can be only one circumferential limiting member 2-14, and the clamping plate 2-7 can abut against the circumferential limiting member 2-14 at two different positions to achieve alignment of the clamping plate 2-7 with the connecting hole and misalignment of the clamping plate 2-7 with the connecting hole; or, see Figure 2 The rear plate of the bearing plate 2-1 is provided with two columnar circumferential limiting members 2-14. When the blade 2-7-2 abuts against one of the circumferential limiting members 2-14, the clamping plate 2-7 is aligned with the connecting hole. When the blade 2-7-2 abuts against the other circumferential limiting member 2-14, the clamping plate 2-7 is misaligned with the connecting hole.

[0039] The second subject of the present invention is a method for constructing a recyclable anchor core and a drainage anchor bolt, which is a method for constructing the first subject mentioned above, and includes the following steps.

[0040] S1. Drill and clean the anchor holes. Based on site conditions and project requirements, paying particular attention to the strata, surface water, and groundwater, determine the diameter, depth, inclination angle, and drilling method of the anchor holes. After drilling, clean the holes to prepare for subsequent construction.

[0041] S2. Remove the rear tube 3-1 of any of the above-mentioned "recoverable anchor core and drainage anchor rods" from the rear end of the sleeve 2-3, and then insert it into the anchor hole. The diameter of the bearing plate 2-1 is slightly smaller than the diameter of the anchor hole, and the outer diameter of the front grout stop plug 2-4 is slightly larger than the diameter of the anchor hole. If the anchor hole is horizontal, nearly horizontal, or inclined upwards, install the rear grout stop plug 2-12 on the outer periphery of the junction of the front and rear sections of the sleeve 2-3, fix the rear grout stop plug 2-12, and then insert the "recoverable anchor core and drainage anchor rod" into the anchor hole.

[0042] S3. Grouting is carried out into grouting zone 2-5. Grouting generally starts from the front end of grouting zone 2-5.

[0043] S4. Insert the rear tube 3-1 between the anchor hole and the sleeve 2-3, and then install the anchor head 4. Install the anchor head 4 and apply prestress according to the cement mortar setting condition and design requirements. If the anchor hole is vertical or tilted downwards, before inserting the rear tube 3-1 into the anchor hole in step S4, the rear grout stop plug 2-12 can be first fitted onto the upper end of the sleeve 2-3.

[0044] S5. When retrieving anchor core 2-6, rotate anchor core 2-6 to remove and retrieve clamping plate 2-7 and anchor core 2-6. After removing anchor core 2-6 and clamping plate 2-7, a water pipe can be installed in the drainage channel as needed to drain accumulated water from the drainage channel.

[0045] The anchor hole penetrates the sliding surface or potential sliding surface. In order to enable the downstream permeable section L3 to effectively drain water, the anchor hole penetrates the sliding surface or potential sliding surface, and the sliding surface and potential sliding surface are located in the downstream permeable section L3.

Claims

1. An anchor bolt with recyclable anchor core and drainage, characterized in that: The structure includes an anchoring section (L2), and two permeable sections (L1 and L3) at the front and rear ends of the anchoring section (L2). The permeable section (L1) includes a front pipe (1), which is a hollow structure with a closed front end and an open rear end. The front pipe (1) is made of permeable material or has a permeable structure. The front end of the anchoring section (L2) is a bearing plate (2-1). The front plate surface of the bearing plate (2-1) is fixedly connected to the rear end of the front pipe (1). The diameter of the front pipe (1) is not greater than the diameter of the bearing plate (2-1). The rear plate surface of the bearing plate (2-1) is fixed with a rear connecting pipe (2-2). The rear connecting pipe (2-2) is connected to the front end of the sleeve (2-3). The outer diameters of both the rear connecting pipe (2-2) and the sleeve (2-3) are smaller than the diameter of the bearing plate (2-1). The front section of the sleeve (2-3) is impermeable and located in the anchoring section (L2). The rear section of the sleeve (2-3) has permeable holes and is located in the rear permeable section (L3). The outer side of the rear section of the sleeve (2-3) is provided with a rear pipe body (3-1). The rear pipe body (3-1) is made of permeable material or has a permeable structure. The rear pipe body (3-1) is a hollow structure with open ends. The outer side of the rear connecting pipe (2-2) is fitted with a front stop. Grout plug (2-4), the front stop grout plug (2-4) abuts against the bearing plate (2-1), the front stop grout plug (2-4) is made of flexible material and fixed to the bearing plate (2-1) or the rear connecting pipe (2-2), the diameter of the front stop grout plug (2-4) is larger than the diameter of the bearing plate (2-1), the area enclosed by the rear end of the front stop grout plug (2-4), the outer wall of the sleeve (2-3) and the front end of the rear pipe (3-1) is the grouting zone (2-5); the sleeve (2-3) is equipped with an anchor core (2-6) that can transmit torque, the front end of the anchor core (2-6) is fixedly connected to a clamping plate (2-7), the clamping plate (2-7) -7) The cross section perpendicular to the length direction of the anchor core (2-6) is non-circular, and on the plane perpendicular to the length direction of the anchor core (2-6), the projection of the card plate (2-7) is located within the circular projection of the inner wall of the rear connecting pipe (2-2) and the inner wall of the sleeve (2-3). A connecting hole is provided between the front plate surface and the rear plate surface of the bearing plate (2-1). The connecting hole connects the front pipe body (1) and the sleeve (2-3). The shape of the connecting hole is adapted to the shape of the card plate (2-7). The rear end of the anchor core (2-6) is connected to an anchor head (4) for abutting against the rear end of the sleeve (2-3) and the rear pipe body (3-1). The front plate of the bearing plate (2-1) is fixed with a front connecting pipe (2-8). On a plane perpendicular to the length direction of the anchor core (2-6), the projection of the card plate (2-7) is located within the circular projection of the front connecting pipe (2-8). The front pipe body (1) includes an inner pipe (1-1) and an outer pipe (1-2). The inner pipe (1-1) is a metal pipe and the pipe body is provided with water-permeable holes. The rear end of the inner pipe (1-1) is threadedly connected to the front connecting pipe (2-8). The front end of the outer pipe (1-2) is conical and the rear end is open. The outer pipe (1-2) is made of recycled material and is sleeved on the outside of the inner pipe (1-1). The outer surface of the outer pipe (1-2) is covered with a front reverse filter layer (1-3).

2. The recyclable anchor core and drainage anchor bolt as described in claim 1, characterized in that: The outer side of the anchor core (2-6) is fitted with a protective tube (2-9), and the space between the anchor core (2-6) and the protective tube (2-9) is filled with anti-corrosion grease.

3. The recyclable anchor core and drainage anchor bolt as described in claim 1, characterized in that: The front end face of the front stop plug (2-4) abuts against the rear plate face of the bearing plate (2-1), and the rear end face of the front stop plug (2-4) is fastened by the locking ring (2-10). The locking ring (2-10) is threadedly engaged with the rear connecting pipe (2-2), or the locking ring (2-10) abuts against the clamp (2-11) fixed on the outer periphery of the rear connecting pipe (2-2). The front stop plug (2-4) is a rubber plate, and the rubber plate is one layer or at least two layers.

4. The recyclable anchor core and drainage anchor bolt as described in claim 1, characterized in that: A rear grout stop plug (2-12) is provided on the outer periphery of the junction between the front and rear sections of the casing (2-3). The rear grout stop plug (2-12) is located at the rear end of the grouting zone (2-5) and abuts against the front end of the rear pipe (3-1). The outer surface of the rear pipe (3-1) is covered with a rear reverse filter layer (3-2).

5. The recyclable anchor core and drainage anchor bolt as described in claim 1, characterized in that: The card plate (2-7) includes a columnar connecting part (2-7-1). The front end of the anchor core (2-6) is fixedly connected to the center of a bottom surface of the connecting part (2-7-1). The outer periphery of the connecting part (2-7-1) is provided with at least one blade (2-7-2) along its radial direction. The outer edge of each blade (2-7-2) is arc-shaped and the corresponding centers of each arc coincide and are located on the axis of the anchor core (2-6).

6. The recyclable anchor core and drainage anchor bolt as described in any one of claims 1 to 4, characterized in that: The front end of the anchor core (2-6) is fixed with an axial limiting member (2-13) to prevent the anchor core (2-6) from being inserted into the connection hole.

7. The recyclable anchor core and drainage anchor bolt as described in claim 6, characterized in that: The bearing plate (2-1) is also provided with a circumferential limiting member (2-14) that abuts against the clamping plate (2-7). When the clamping plate (2-7) abuts against the circumferential limiting member (2-14), the clamping plate (2-7) is aligned with the connecting hole, or the clamping plate (2-7) is misaligned with the connecting hole.

8. The construction method of the recyclable anchor core and drainage anchor bolt according to any one of claims 1 to 7, characterized in that, Includes the following steps: S1. Drill anchor holes and clean the holes; S2. Remove the rear tube (3-1) from the rear end of the sleeve (2-3) and then insert it into the anchor hole; S3. Grout the grouting area (2-5); S4. Insert the rear tube (3-1) between the anchor hole and the sleeve (2-3), and then install the anchor head (4). S5. When recovering the anchor core (2-6), rotate the anchor core (2-6) to remove and recover the clamping plate (2-7) and the anchor core (2-6).

9. The construction method of the recyclable anchor core and drainage anchor bolt as described in claim 8, characterized in that: The anchor hole penetrates the sliding surface or potential sliding surface, and the sliding surface and potential sliding surface are located in the post-permeable section (L3).

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