Recyclable pre-stressed anchor cable and construction method

Abstract

The invention relates to the technical field of geotechnical engineering anchoring, in particular to a recoverable pre-stressed anchor cable and a construction method.The recoverable pre-stressed anchor cable comprises a steel strand, the steel strand is sleeved with a wrapping pipe, and a sliding gap is reserved between the steel strand and the wrapping pipe; the outer diameter of the anchor cable head is smaller than the inner diameter of the wrapping pipe, the anchor cable head is hollow, and one end of the steel strand penetrates out of an inner cavity of the wrapping pipe and extends into an inner cavity of the anchor cable head; the transverse inserting strips are connected with the anchor cable head in a sliding mode, and the transverse inserting strips slide in the radial direction of the steel strand; the linkage piece is connected with the steel strand, the linkage piece is connected with the transverse inserting strip, and the steel strand and the anchor cable head relatively slide in a reciprocating mode so that the transverse inserting strip can slide in a reciprocating mode in the radial direction of the steel strand; when the steel strand rotates, the transverse inserting strip slides towards one end of the steel strand through the locking piece; the device has the effect that the anchor cable head and the anchor cable can be recycled after temporary supporting of the soil body is completed, so that material waste is reduced.

Description

Technical Field

[0001] This application relates to the technical field of geotechnical engineering anchoring, and particularly relates to a recyclable prestressed anchor cable and a construction method thereof. Background Art

[0002] The prestressed anchor cable technology is widely used in geotechnical engineering for strengthening unstable rock and soil masses or providing temporary support. Traditional anchor cables usually consist of steel strands, anchorage sections, free sections, and anchor fittings. After construction, the steel strands are permanently buried in the formation and cannot be recovered. However, with the improvement of environmental protection requirements and the enhancement of resource conservation awareness, the recyclable anchor cable technology has gradually become a research hotspot.

[0003] A recyclable anchor cable for civil engineering is disclosed in the prior art. It includes a metal rod, an outer sleeve, a nut, and a steel cable. The outer sleeve is sleeved on the metal rod and is made of high-strength steel. The nut is installed at the tail of the metal rod, and the steel cable is fixed at the tail of the metal rod. The metal rod includes a swelling wedge, a swelling head, a thread, a fixing block, and a fixing hole. The head of the metal rod is provided with a swelling wedge and a swelling head. The swelling wedge is a conical structure, and the swelling head is a cylindrical structure. The tail of the metal rod is provided with a thread, and the end of the metal rod is provided with a fixing block, and the fixing block is provided with a fixing hole. The outer sleeve includes a backing plate, a pulling hole, a groove, an anchor head, and a bump. The tail of the outer sleeve is provided with a backing plate, and four pulling holes are opened on the backing plate, and the pulling holes can fix bolts. The outer surface of the front part of the outer sleeve is provided with bumps, the front end of the outer sleeve is provided with an anchor head, and three grooves are opened in the front part of the outer sleeve.

[0004] In view of the above related technologies, after use, by separating the end of the metal rod extending into the soil from the outer sleeve and applying force to the steel cable to pull out the metal rod, the outer sleeve, that is, the anchor head, still remains in the soil and cannot be taken out, and thus cannot be recycled and reused, resulting in waste. Summary of the Invention

[0005] In order to realize the recovery of the anchor head and the anchor cable after the temporary support of the soil body is completed to reduce material waste, this application provides a recyclable prestressed anchor cable and a construction method thereof.

[0006] The recyclable prestressed anchor cable and the construction method provided by this application adopt the following technical solutions: In the first aspect, this application provides a recyclable prestressed anchor cable.

[0007] A recyclable prestressed anchor cable includes: A steel strand, an outer coating tube is sleeved on the steel strand, and a sliding gap is left between the steel strand and the coating tube; An anchor head, the outer diameter of the anchor head is smaller than the inner diameter of the coating tube, and the anchor head is hollow, and one end of the steel strand passes through the inner cavity of the coating tube and extends into the inner cavity of the anchor head; A plurality of laterally inserted strips with slopes, the laterally inserted strips are slidably connected to the cable anchor head, and the laterally inserted strips slide along the radial direction of the strand; Linkage members, the linkage members are connected to the strand, and the linkage members are connected to the laterally inserted strips. The relative reciprocating sliding of the strand and the cable anchor head causes the laterally inserted strips to reciprocally slide along the radial direction of the strand; Locking members, the locking members are connected to the strand, and the locking members are connected to the laterally inserted strips. When the strand rotates, the locking members cause the laterally inserted strips to slide towards one end of the strand.

[0008] By adopting the above technical solutions, geological exploration is carried out at the soil body that needs temporary support, and measurement positioning and material preparation are carried out; then appropriate drilling equipment and drilling methods are selected to construct an anchor hole in the soil body and then hole cleaning treatment is carried out; the laterally inserted strips are first extended in place and then locked by the locking members, and then the recoverable prestressed cable is placed into the anchor hole and then concrete slurry is injected under pressure, or the recoverable prestressed cable is first placed into the anchor hole, and then concrete slurry is injected into the anchor hole under pressure. After the concrete in the anchor hole begins to set, the strand is pulled. The strand causes the laterally inserted strips to extend in place and insert into the concrete through the linkage members; subsequently, a waist beam is constructed on the outside of the soil body that needs temporary support; after the concrete in the anchor hole is completely solidified, the tensile force of the strand is adjusted according to the requirements of temporary support to achieve temporary support of the soil body. After the temporary support of the soil body is completed, cable anchor recovery is also included. First, the prestress of the strand is gradually released according to the principle of "the last installed is the first to be disassembled"; then a force is applied to the strand to cause the strand to move towards the bottom end of the anchor hole. While the strand is moving, a force is applied to the laterally inserted strips through the linkage members, causing the laterally inserted strips to disengage from the concrete in the anchor hole and retract into the cable anchor head; then the strand is rotated to cause the locking members to keep the laterally inserted strips in contact with the strand, and then a force is applied to the strand again to cause the strand to move towards the orifice end of the anchor hole. While the strand is moving, the cable anchor head is driven into the coating tube through the linkage members and the laterally inserted strips until the cable anchor head is completely withdrawn, and the cable anchor recovery is completed; the designed recoverable prestressed cable can separate the strand from the concrete in the anchor hole through the coating tube, thereby facilitating the extraction of the strand after the temporary support is completed. Through the cooperation of the cable anchor head and the laterally inserted strips, the strand can provide a bearing foundation for the cable anchor head after the concrete in the anchor hole solidifies. Through the linkage members, the reciprocating sliding of the laterally inserted strips can be realized by means of the forward and backward movement of the strand in the anchor hole, thereby realizing the extension and retraction of the laterally inserted strips, so as to facilitate the recovery of the cable anchor head to reduce material waste. Through the locking members, the position of the laterally inserted strips can be locked before the cable anchor head is recovered, avoiding the possibility of the laterally inserted strips extending again when the strand is pulled outwards.

[0009] In a specific feasible implementation, an elastic telescopic cover is sleeved on the cable anchor head. The elastic telescopic cover is adhesively fixed to the cable anchor head. When the transverse insertion strip slides towards the side away from the steel strand, the elastic telescopic cover bulges outwards, and when the force on the elastic telescopic cover exceeds a preset threshold value, it disengages from the cable anchor head.

[0010] By adopting the above technical solution, the designed elastic telescopic cover can isolate the cable anchor head and the transverse insertion strip from the concrete in the anchor hole. Furthermore, after the temporary support is completed, it is convenient to separate the cable anchor head and the transverse insertion strip from the concrete in the anchor hole.

[0011] In a specific feasible implementation, the linkage member includes: Multiple elastic ropes, both ends of the elastic ropes are respectively connected to the two transverse insertion strips, and the elastic ropes are in a stretched state; At least one driving frustum, the driving frustum is coaxially connected to the steel strand, the outer diameter of the driving frustum gradually decreases towards the end of the coating pipe, and the driving frustum close to the coating pipe can abut against the cable anchor head.

[0012] By adopting the above technical solution, the designed linkage member can make the two transverse insertion strips tend to move towards the end of the steel strand through the elastic ropes. Furthermore, when the effect of the driving frustum is lost, the transverse insertion strips can return into the cable anchor head. By the cooperation of the driving frustum and the forward and backward movement of the steel strand along the direction of the anchor hole, the extension of the transverse insertion strips can be realized.

[0013] In a specific feasible implementation, a semi-circular hole is opened on the side of the transverse insertion strip close to the steel strand, and when the two transverse insertion strips abut against each other, there is a gap between the steel strand and the hole wall of the semi-circular hole.

[0014] By adopting the above technical solution, the designed semi-circular hole can firstly increase the original length of the transverse insertion strip, thereby facilitating the guarantee of the stability of the position between the transverse insertion strip and the cable anchor head. Secondly, it is convenient for the driving frustum to pass through the semi-circular hole and then drive the transverse insertion strip to slide.

[0015] In a specific feasible implementation, a force application disc is coaxially connected to the side of the driving frustum away from the coating pipe. When the driving frustum close to the coating pipe abuts against the cable anchor head, the force application disc abuts against the transverse insertion strip.

[0016] By adopting the above technical solution, the designed force application disc can cooperate with the driving frustum to transfer the acting force of the steel strand to the cable anchor head.

[0017] In a specific feasible implementation, the locking member includes a locking rope, both ends of the locking rope are respectively connected to the steel strand and the transverse insertion strip, and the steel strand and the anchor cable head can rotate relative to each other.

[0018] By adopting the above technical solution, the designed locking member can lock the position of the transverse insertion strip through the cooperation of the locking rope and the rotatable steel strand. Furthermore, during the recovery process of the anchor cable head, it can prevent the driving frustum from driving the transverse insertion strip to slide out, thereby avoiding the possibility of the failure of the anchor cable head recovery.

[0019] In a specific feasible implementation, it further includes an anchor plate, the anchor plate is connected to the coating pipe, the number of steel strands is multiple, the anchor plate is provided with multiple through holes for the anchor cable head to pass through, and there is a sliding friction force between the anchor plate and the anchor cable head.

[0020] By adopting the above technical solution, the designed anchor plate can first increase the number of steel strands, and secondly, it can be used as the front end of the force in contact with the concrete in the anchor hole, thereby advancing the extension timing of the transverse insertion strip.

[0021] In a second aspect, the present application provides a construction method for temporary soil support.

[0022] A construction method for temporary soil support includes: Preparation before construction: Conduct geological exploration at the soil where temporary support is required, and perform measurement positioning and material preparation; Anchor hole construction: Select appropriate drilling equipment and drilling methods to construct anchor holes in the soil and then perform hole cleaning; Anchor cable installation: First, extend the transverse insertion strip in place and lock it through the locking member, then place the recoverable prestressed anchor cable into the anchor hole and inject concrete slurry under pressure, or first place the recoverable prestressed anchor cable into the anchor hole, then inject concrete slurry into the anchor hole under pressure. After the concrete in the anchor hole begins to set, pull the steel strand, and the steel strand makes the transverse insertion strip extend in place and insert into the concrete through the linkage member; Waist beam construction: Construct a waist beam on the outside of the soil where temporary support is required; Tensioning and locking: After the concrete in the anchor hole is completely solidified, adjust the tensile force of the steel strand according to the requirements of temporary support to achieve temporary soil support.

[0023] By adopting the above technical solution, geological exploration is carried out at the soil body that needs temporary support, and measurement positioning and material preparation are carried out; then appropriate drilling equipment and drilling methods are selected to construct anchor holes in the soil body and then hole cleaning treatment is carried out; then the recyclable prestressed anchor cable is placed into the anchor hole; then concrete slurry is injected into the anchor hole under pressure. After the concrete in the anchor hole begins to set, the steel strand is pulled. The steel strand makes the transverse insertion strip extend in place through the linkage and insert into the concrete; then the waist beam is constructed on the outside of the soil body that needs temporary support; after the concrete in the anchor hole is completely solidified, the tension of the steel strand is adjusted according to the need of temporary support to realize the temporary support of the soil body.

[0024] In a specific feasible implementation, after the temporary support of the soil body is completed, the following steps are further included: Steel strand unloading: Gradually release the prestress of the steel strand according to the principle of "installing later and removing first". Steel strand in-extension: Apply force to the steel strand to make the steel strand move towards the bottom end of the anchor hole. While the steel strand moves, apply force to the transverse insertion strip through the linkage, so that the transverse insertion strip disengages from the concrete in the anchor hole and retracts into the anchor cable head. Anchor cable head out-pulling: Rotate the steel strand to keep the transverse insertion strip in contact with the steel strand through the locking part, and then apply force to the steel strand again to make the steel strand move towards the orifice end of the anchor hole. While the steel strand moves, drive the anchor cable head into the cladding tube through the linkage and the transverse insertion strip until the anchor cable head is completely withdrawn, and the recovery of the anchor cable is completed.

[0025] By adopting the above technical solution, the cladding tube can be used to separate the steel strand from the concrete in the anchor hole, which is convenient for the extraction of the steel strand after the temporary support is completed. The cooperation of the anchor cable head and the transverse insertion strip with the steel strand can provide a bearing foundation for the anchor cable head after the concrete in the anchor hole solidifies. The linkage can make the transverse insertion strip slide reciprocally by means of the forward and backward movement of the steel strand in the anchor hole, so as to realize the extension and retraction of the transverse insertion strip, which is convenient for the recovery of the anchor cable head to reduce material waste. The locking part can lock the position of the transverse insertion strip before the recovery of the anchor cable head to avoid the possibility of the transverse insertion strip extending again when the steel strand is pulled outwards.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. The designed recyclable prestressed anchor cable can separate the steel strand from the concrete in the anchor hole through the covering tube, so as to facilitate the extraction of the steel strand after the temporary support is completed. The anchor cable head and the transverse splice strip cooperate with the steel strand to provide a bearing foundation for the anchor cable head after the concrete in the anchor hole solidifies. The linkage piece can realize the reciprocating sliding of the transverse splice strip with the help of the forward and backward movement of the steel strand in the anchor hole, so as to realize the extension and retraction of the transverse splice strip, so as to facilitate the recovery of the anchor cable head to reduce material waste. The locking piece can realize the position locking of the transverse splice strip before the anchor cable head is recovered, so as to avoid the possibility of the transverse splice strip extending again when the steel strand is pulled outward.

[0027] 2. The designed recyclable prestressed anchor cable can isolate the anchor cable head and the transverse splice strip from the concrete in the anchor hole through the elastic telescopic cover, so that after the temporary support is completed, the anchor cable head and the transverse splice strip can be easily separated from the concrete in the anchor hole.

[0028] 3. The designed recyclable prestressed anchor cable can make the two transverse splices have a tendency to move toward one end of the steel strand through the elastic rope, so that when the driving round table loses its function, the transverse splice can be returned to the anchor cable head, and the transverse splice can be extended by driving the round table to cooperate with the steel strand to move forward and backward along the direction of the anchor hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the structure of the recyclable prestressed anchor cable according to an embodiment of the present application.

[0030] Figure 2 yes Figure 1 sectional view of .

[0031] Figure 3 is Figure 2 Schematic diagram after adding an elastic telescopic cover to the foundation.

[0032] Figure 4 is Figure 3 The corresponding overall diagram is a cross-sectional view after being cut perpendicular to the direction of the steel strand.

[0033] Figure 5 is Figure 3 Schematic diagram of the three-dimensional structure after adding anchor plates to the corresponding overall diagram.

[0034] Explanation of the reference numerals in the accompanying drawings: 1. Steel strand; 2. Coating tube; 3. Anchor head; 4. Horizontal plug-in strip; 5. Linkage member; 51. Elastic rope; 52. Driving table; 6. Locking member; 61. Locking rope; 7. Elastic telescopic cover; 8. Force application disk; 9. Anchor plate. DETAILED DESCRIPTION

[0035] The following is combined with Figures 1-5Further details of the present application will be described below.

[0036] An embodiment of the present application discloses a recyclable prestressed anchor cable and a construction method thereof.

[0037] In a first aspect, an embodiment of the present application discloses a recyclable prestressed anchor cable.

[0038] Referring to Figure 1 and Figure 2 , a recyclable prestressed anchor cable includes a steel strand 1, a sheathing tube 2, an anchor head 3, and a transverse insertion strip 4. The sheathing tube 2 is sleeved outside the steel strand 1, and a sliding gap is left between the steel strand 1 and the sheathing tube 2. The outer diameter of the anchor head 3 is set to be smaller than the inner diameter of the sheathing tube 2, and the anchor head 3 is hollow. One end of the steel strand 1 passes through the inner cavity of the sheathing tube 2 and extends into the inner cavity of the anchor head 3, and the steel strand 1 is slidably connected to the anchor head 3. The number of the transverse insertion strips 4 is multiple, and two transverse insertion strips 4 form a group. The transverse insertion strip 4 forms an inclination with a decreasing thickness along the radial direction of the steel strand 1, and the transverse insertion strip 4 is slidably connected to the anchor head 3 and slides along the radial direction of the steel strand 1.

[0039] Referring to Figure 2 and Figure 3 , further, in order to achieve the separation between the concrete in the anchor hole and the anchor head 3 and the transverse insertion strip 4, an elastic telescopic cover 7 is sleeved on the anchor head 3. The elastic telescopic cover 7 is adhesively fixed to the anchor head 3, and when the transverse insertion strip 4 slides towards the end away from the steel strand 1, the elastic telescopic cover 7 can bulge outwards. When the force on the elastic telescopic cover 7 exceeds a preset value, it can be separated from the anchor head 3, thereby reducing the resistance during the recovery of the anchor head 3.

[0040] Referring to Figure 3 and Figure 4 , further, in order to achieve the linkage between the steel strand 1 and the transverse insertion strip 4, the recyclable prestressed anchor cable further includes a linkage member 5 and a locking member 6. The linkage member 5 is connected to the steel strand 1 and is also connected to the transverse insertion strip 4. When the steel strand 1 and the anchor head 3 slide relative to each other, the transverse insertion strip 4 slides reciprocally along the radial direction of the steel strand 1, thereby realizing the extension or retraction of the transverse insertion strip 4 from within the anchor head 3. The locking member 6 is connected to the steel strand 1 and is also connected to the transverse insertion strip 4. When the steel strand 1 rotates, a force is applied to the transverse insertion strip 4 through the locking member 6, causing the transverse insertion strip 4 to slide towards the end close to the steel strand 1. At this time, a relative rotation gap is left between the steel strand 1 and the anchor head 3.

[0041] Referring to Figure 3 and Figure 4, Specifically, the linkage member 5 includes multiple elastic ropes 51 and at least one driving frustum 52. The two ends of the elastic rope 51 are respectively connected to two transverse insertion bars 4 of the same group, and the elastic rope 51 is always in a stretched state to facilitate the abutment of the two transverse insertion bars 4 of the same group. The driving frustum 52 is coaxially welded and fixed to the steel strand 1, and the outer diameter of the driving frustum 52 gradually decreases towards the side of the coating tube 2. The driving frustum 52 close to the coating tube 2 can abut against the anchor head 3, and at this time, the driving frustum 52 applies a force to the transverse insertion bar 4 so that the transverse insertion bar 4 slides out to the maximum distance towards the end away from the steel strand 1; through the elastic rope 51, the two transverse insertion bars 4 can have a tendency to move towards the end of the steel strand 1, and then when the effect of the driving frustum 52 is lost, the transverse insertion bar 4 can return into the anchor head 3. By the cooperation of the driving frustum 52 and the forward and backward movement of the steel strand 1 along the direction of the anchor hole, the extension of the transverse insertion bar 4 can be realized.

[0042] Refer to Figure 4 , Further, a semi-circular hole is formed on the side of the transverse insertion bar 4 close to the steel strand 1, and there is a gap between the steel strand 1 and the hole wall of the semi-circular hole when the two transverse insertion bars 4 abut; moreover, a force-applying disc 8 is coaxially connected to the side of the driving frustum 52 away from the coating tube 2. When the driving frustum 52 close to the coating tube 2 abuts against the anchor head 3, the force-applying disc 8 abuts against the transverse insertion bar 4. Through the force-applying disc 8, the acting force of the steel strand 1 can be transmitted to the anchor head 3 in cooperation with the driving frustum 52.

[0043] Refer to Figure 3 , Specifically, the locking member 6 includes a locking rope 61. The two ends of the locking rope 61 are respectively connected to the steel strand 1 and the transverse insertion bar 4. Through the locking rope 61, the position of the transverse insertion bar 4 can be locked in cooperation with the rotating steel strand 1, and further, during the recovery process of the anchor head 3, the driving frustum 52 is prevented from driving the transverse insertion bar 4 to slide out, thereby avoiding the possibility of the failure of the recovery of the anchor head 3. It should be noted that the locking rope 61 has a certain length so that when the steel strand 1 reciprocates along the direction of the anchor hole, it will not affect the transverse insertion bar 4 through the locking rope 61.

[0044] Refer to Figure 5 , Further, the recoverable prestressed anchor cable further includes an anchor plate 9. The anchor plate 9 is connected to the coating tube 2, and the number of the steel strands 1 and the anchor heads 3 is set to be multiple. The anchor plate 9 is provided with multiple through holes for the anchor heads 3 to pass through, and there is a sliding resistance between the anchor plate 9 and the anchor heads 3, so that after injecting concrete into the anchor hole, it can be used as the front end in contact with the concrete in the anchor hole to receive the force, and the extension time of the transverse insertion bar 4 can be advanced during the solidification process of the concrete.

[0045] The implementation principle of a recyclable prestressed anchor cable in an embodiment of this application is as follows: Geological exploration is carried out at the soil where temporary support is required, and measurement positioning and material preparation are done; Then select appropriate drilling equipment and drilling method to construct an anchor hole in the soil and perform hole cleaning treatment; First, extend the transverse insertion strip 4 in place and lock it through the locking part 4, then put the recyclable prestressed anchor cable into the anchor hole and inject concrete slurry under pressure, or first put the recyclable prestressed anchor cable into the anchor hole; Then inject concrete slurry into the anchor hole under pressure. After the concrete in the anchor hole begins to set, pull the steel strand 1. The steel strand 1 makes the transverse insertion strip 4 extend in place and insert into the concrete through the linkage part 5; Subsequently, construct a waist beam on the outside of the soil where temporary support is required; After the concrete in the anchor hole is completely solidified, adjust the tensile force of the steel strand 1 according to the requirements of temporary support to achieve temporary support of the soil.

[0046] After the temporary support of the soil is completed, it also includes the recovery of the anchor cable. First, gradually release the prestress of the steel strand 1 according to the principle of "the last installed is the first to be removed"; Then apply force to the steel strand 1 to make the steel strand 1 move towards the bottom end of the anchor hole. While the steel strand 1 is moving, apply force to the transverse insertion strip 4 through the linkage part 5, so that the transverse insertion strip 4 separates from the concrete in the anchor hole and retracts into the anchor cable head 3; Then rotate the steel strand 1 to keep the transverse insertion strip 4 in contact with the steel strand 1 through the locking part 6. Then apply force to the steel strand 1 again to make the steel strand 1 move towards the orifice end of the anchor hole. While the steel strand 1 is moving, drive the anchor cable head 3 into the cladding tube 2 through the linkage part 5 and the transverse insertion strip 4 until the anchor cable head 3 is completely withdrawn, and the recovery of the anchor cable is completed; Through the cladding tube 2, the separation between the steel strand 1 and the concrete in the anchor hole can be realized, which is convenient for the extraction of the steel strand 1 after the temporary support is completed. Through the cooperation of the anchor cable head 3 and the transverse insertion strip 4 with the steel strand 1, a bearing foundation can be provided for the anchor cable head 3 after the concrete in the anchor hole solidifies. Through the linkage part 5, the reciprocating sliding of the transverse insertion strip 4 can be realized by means of the forward and backward movement of the steel strand 1 in the anchor hole, and then the extension and retraction of the transverse insertion strip 4 can be realized, so as to facilitate the recovery of the anchor cable head 3 to reduce material waste. Through the locking part 6, the position of the transverse insertion strip 4 can be locked before the recovery of the anchor cable head 3, avoiding the possibility of the transverse insertion strip 4 extending again when the steel strand 1 is pulled outwards.

[0047] In the second aspect, an embodiment of this application discloses a construction method for temporary soil support.

[0048] Refer to Figures 1 to 5 , a construction method for temporary soil support, which is realized by using the recyclable prestressed anchor cable disclosed in the first aspect of the embodiment of this application, includes: S1: Preparation before construction: Conduct geological exploration at the soil where temporary support is required, and perform measurement positioning and material preparation; S2: Anchor hole construction: Select appropriate drilling equipment and methods to construct anchor holes in the soil mass, and then perform hole cleaning treatment. S3: Anchor cable installation: Use a traction sleeve to place the recyclable prestressed anchor cable into the anchor hole. S4: Grouting reinforcement: Inject concrete slurry into the anchor hole under pressure. After the concrete in the anchor hole begins to set, pull the steel strand 1. The steel strand 1 causes the transverse insertion strip 4 to extend in place through the linkage member 5 and insert into the concrete. S5: Beam construction: Construct a beam on the outside of the soil mass that needs temporary support. S6: Tensioning and locking: After the concrete in the anchor hole has completely solidified, adjust the tension of the steel strand 1 according to the requirements of temporary support to achieve temporary support of the soil mass. S7: Unloading of the steel strand 1: After the temporary support of the soil mass is completed, gradually release the prestress of the steel strand 1 according to the principle of "the last installed is the first to be removed". S8: Inner extension of the steel strand 1: Apply force to the steel strand 1 to make it move towards the bottom end of the anchor hole. While the steel strand 1 is moving, apply force to the transverse insertion strip 4 through the linkage member 5, so that the transverse insertion strip 4 disengages from the concrete in the anchor hole and retracts into the anchor cable head 3. S9: Outer pull of the anchor cable head 3: Rotate the steel strand 1 to keep the transverse insertion strip 4 in contact with the steel strand 1 through the locking member 6. Then apply force to the steel strand 1 again to make it move towards the orifice end of the anchor hole. While the steel strand 1 is moving, drive the anchor cable head 3 into the covering tube 2 through the linkage member 5 and the transverse insertion strip 4 until the anchor cable head 3 is completely withdrawn, and the recovery of the anchor cable is completed.

[0049] In some other embodiments of the present application, a method for constructing temporary support for soil mass is implemented by using the recyclable prestressed anchor cable disclosed in the first aspect of the embodiments of the present application, and includes: S1: Preparation before construction: Conduct geological exploration at the soil mass that needs temporary support, and perform measurement positioning and material preparation. S2: Anchor hole construction: Select appropriate drilling equipment and methods to construct anchor holes in the soil mass, and then perform hole cleaning treatment. S3: Anchor cable installation: First extend the transverse insertion strip 4 in place and lock it with the locking member 6. Then use a traction sleeve to place the recyclable prestressed anchor cable into the anchor hole. Then inject concrete slurry into the anchor hole under pressure. S4: Beam construction: Construct a beam on the outside of the soil mass that needs temporary support. S5: Tensioning and locking: After the concrete in the anchor hole has completely solidified, adjust the tension of the steel strand 1 according to the requirements of temporary support to achieve temporary support of the soil mass. S6: Unloading of the steel strand 1: After the temporary support of the soil mass is completed, gradually release the prestress of the steel strand 1 according to the principle of "the last installed is the first to be removed". S7: Inner extension of the steel strand 1: First, rotate the steel strand 1 to make the locking member 4 stop locking the transverse insertion strip 4, and then apply a force to the steel strand 1 to make the steel strand 1 move towards the bottom end of the anchor hole. While the steel strand 1 is moving, apply a force to the transverse insertion strip 4 through the linkage member 5, so that the transverse insertion strip 4 is separated from the concrete in the anchor hole and retracts into the anchor cable head 3; S8: Outer pull of the anchor cable head 3: Rotate the steel strand 1 in the reverse direction to keep the transverse insertion strip 4 in contact with the steel strand 1 through the locking member 6, and then apply a force to the steel strand 1 again to make the steel strand 1 move towards the orifice end of the anchor hole. While the steel strand 1 is moving, drive the anchor cable head 3 into the coating pipe 2 through the linkage member 5 and the transverse insertion strip 4 until the anchor cable head 3 is completely withdrawn, and the anchor cable recovery is completed.

[0050] The above are all the preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A recyclable prestressed anchor cable, characterized in that: include: A steel strand (1), wherein a sheathed tube (2) is disposed on the steel strand (1), and a sliding gap is left between the steel strand (1) and the sheathed tube (2); An anchor cable head (3), wherein the outer diameter of the anchor cable head (3) is smaller than the inner diameter of the sheathing tube (2), and the anchor cable head (3) is hollow, and one end of the steel strand (1) passes through the inner cavity of the sheathing tube (2) and extends into the inner cavity of the anchor cable head (3); A plurality of transverse plug-in strips (4) with an inclination, wherein the transverse plug-in strips (4) are slidably connected to the anchor cable head (3), and the transverse plug-in strips (4) slide along the radial direction of the steel strand (1); A linkage member (5), wherein the linkage member (5) is connected to the steel strand (1), and the linkage member (5) is connected to the transverse plug-in strip (4), and the steel strand (1) and the anchor cable head (3) slide back and forth relative to each other so that the transverse plug-in strip (4) slides back and forth along the radial direction of the steel strand (1); A locking piece (6), wherein the locking piece (6) is connected to the steel strand (1), and the locking piece (6) is connected to the transverse plug-in strip (4), and when the steel strand (1) rotates, the transverse plug-in strip (4) is caused to slide toward one end of the steel strand (1) through the locking piece (6).

2. The recyclable prestressed anchor cable according to claim 1, characterized in that: An elastic telescopic cover (7) is sleeved on the anchor cable head (3), and the elastic telescopic cover (7) is bonded and fixed to the anchor cable head (3). When the transverse plug-in strip (4) slides toward the side away from the steel strand (1), the elastic telescopic cover (7) bulges outward, and when the elastic telescopic cover (7) is subjected to a force exceeding a preset threshold, it is separated from the anchor cable head (3).

3. The recyclable prestressed anchor cable according to claim 1, characterized in that: The linkage member (5) comprises: A plurality of elastic ropes (51), wherein two ends of the elastic ropes (51) are respectively connected to two of the transverse plug-in strips (4), and the elastic ropes (51) are in a stretched state; At least one driving truncated platform (52) is coaxially connected to the steel strand (1), the outer diameter of the driving truncated platform (52) gradually decreases toward one end of the sheathing tube (2), and the driving truncated platform (52) close to the sheathing tube (2) can abut against the anchor cable head (3).

4. The recyclable prestressed anchor cable according to claim 3, characterized in that: A semicircular hole is provided on one side of the transverse plug-in strip (4) close to the steel strand (1), and when two transverse plug-in strips (4) are in contact, a gap is left between the steel strand (1) and the wall of the semicircular hole.

5. The recyclable prestressed anchor cable according to claim 3, characterized in that: A force disc (8) is coaxially connected to the driving truncated platform (52) at a side away from the covering tube (2); when the driving truncated platform (52) close to the covering tube (2) abuts against the anchor cable head (3), the force disc (8) abuts against the transverse plug-in strip (4).

6. The recyclable prestressed anchor cable according to claim 3, characterized in that: The locking member (6) comprises a locking rope (61), the two ends of which are respectively connected to the steel strand (1) and the transverse splicing strip (4), and the steel strand (1) and the anchor cable head (3) are capable of relative rotation.

7. The recyclable prestressed anchor cable according to any one of claims 1 to 6, characterized in that: It also includes an anchor plate (9), the anchor plate (9) is connected to the sheathing tube (2), the number of the steel strands (1) is multiple, the anchor plate (9) is provided with multiple through holes for the anchor cable head (3) to pass through, and there is sliding friction between the anchor plate (9) and the anchor cable head (3).

8. A soil temporary support construction method, characterized in that: The method is implemented by using the recyclable prestressed anchor cable according to any one of claims 1 to 7, comprising: Preparation before construction: Conduct geological surveys at the soil that requires temporary support, and make measurement, positioning and material preparations; Anchor hole construction: Select appropriate drilling equipment and drilling methods to construct anchor holes in the soil and then clean the holes; Anchor cable installation: the transverse splicing strip (4) is first extended into position and then locked by a locking piece (6), and then the recyclable prestressed anchor cable is placed in the anchor hole and then the concrete slurry is injected under pressure, or the recyclable prestressed anchor cable is first placed in the anchor hole and then the concrete slurry is injected into the anchor hole under pressure, and after the concrete in the anchor hole is initially solidified, the steel strand (1) is pulled, and the steel strand (1) is extended into position and inserted into the concrete through a linkage piece (5); Waist beam construction: construct the waist beam outside the soil that needs temporary support; Tensioning and locking: After the concrete in the anchor hole is completely solidified, the tensioning force of the steel strand (1) is adjusted according to the needs of temporary support to achieve temporary support of the soil.

9. The soil temporary support construction method according to claim 8, characterized in that: After the temporary support of the soil is completed, the following steps are also included: Unloading of the steel strand (1): gradually releasing the prestress of the steel strand (1) according to the principle of "install last, remove first"; The steel strand (1) extends inward: force is applied to the steel strand (1) so that the steel strand (1) moves toward one end of the bottom of the anchor hole, and while the steel strand (1) moves, force is applied to the transverse plug-in strip (4) through the linkage member (5), so that the transverse plug-in strip (4) is separated from the concrete in the anchor hole and retracted into the anchor cable head (3); Pulling the anchor cable head (3) outward: rotating the steel strand (1) to keep the transverse splicing strip (4) in contact with the steel strand (1) through the locking member (6), and then applying force to the steel strand (1) again to make the steel strand (1) move toward one end of the hole opening of the anchor hole. While the steel strand (1) moves, the anchor cable head (3) is driven into the sheathing tube (2) through the linkage member (5) and the transverse splicing strip (4), until the anchor cable head (3) is completely pulled out and the anchor cable recovery is completed.

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