Replaceable, shock-absorbing prestressed anchoring system for prefabricated assembly and construction method thereof

Abstract

The present invention relates to a replaceable, shock-absorbing prestressed anchoring system for prefabricated assembly and a construction method thereof. The anchor comprises a fixed-end anchoring assembly, a tensioning-end anchoring assembly, and a prestressed anchor bar assembly located between the fixed-end anchoring assembly and the tensioning-end anchoring assembly. The fixed-end anchoring assembly comprises a lower protective cover, a split slider, and a fixed-end anchoring sleeve. The split slider is located inside the lower protective cover and is slidably connected to the lower protective cover. The lower protective cover is fixed to the fixed-end anchoring sleeve on its upper portion by bolts. The upper portion of the fixed-end anchoring sleeve is connected to a pre-buried pipe. The prestressed anchor bar assembly comprises a prestressed anchor bar and a guide head. The tensioning-end anchoring assembly comprises a tensioning-end anchoring sleeve, a tensioning-end anchor head, and a tensioning-end anchoring sleeve. The replaceable, shock-absorbing prestressed anchoring system for prefabricated assembly and the installation and replacement construction method thereof proposed by the present invention provide bridges with shock-absorbing and isolation capabilities. The anchor is replaceable. The bridge construction period is shortened while the bridge construction quality is improved. The application range is wide.

Description

Technical Field

[0001] The present invention relates to the field of civil construction technology, in particular to a replaceable, shock-absorbing prestressed anchoring system for prefabricated assembly and a construction method thereof. Background Art

[0002] The use of prefabricated assembled bridge piers is a relatively advanced modern construction method with fast construction speed, short construction period, good economy and greater environmental protection. Currently, there are two types of prefabricated assembled bridge pier construction. One is to leave vertical steel bars on the pier cap, prefabricate the entire bridge pier and cap beam separately in the prefabrication plant and transport them to the site. The lower part of the prefabricated bridge pier and the lower part of the cap beam are pre-embedded with pre-embedded grouting sleeves. The prefabricated bridge pier is inserted on the pier cap on site, and the steel bars on the upper part of the pier cap need to be inserted into the pre-embedded grouting sleeves of the bridge pier. After the insertion is completed, grouting is performed at the bottom of the pier. After a certain period of time, it is considered that the grouting material has reached the set strength, and the bridge pier and the pier cap become one. Similarly, the vertical steel bars are exposed on the upper part of the bridge pier, and then the cap beam is hoisted above the bridge pier, and the steel bars of the bridge pier are inserted into the sleeves of the cap beam. After reaching the designated position, grouting is performed. After a period of time, it can be considered that the bridge pier and the cap beam have been consolidated. The disadvantage of this method is that the number, length and strength of the steel bars connecting the piers and abutments or the piers and cap beams are limited, so that the overall strength of the assembled piers does not reach the strength of cast-in-place construction.

[0003] Another method is to prefabricate the concrete segments of the piers in the factory and then assemble them at the construction site. Prestressed anchor bars are then used to apply prestress to the concrete segments, ensuring a tight fit and achieving an integrated effect. Specifically, one end of the prestressed anchor bar is anchored and pre-embedded into the upper portion of the pier cap, and then the prefabricated concrete pier segments are spliced together. After a certain number of segments are added, the prestressed anchor bars must be connected and lengthened using connectors. Alternatively, the anchor end of the self-locking prestressed anchor bar is pre-embedded into the upper portion of the pier cap, and then the concrete segments are hoisted. After hoisting, the prestressed anchor bar is inserted from above into the self-locking anchor end of the pier cap, and then prestress is applied. This construction method is cumbersome and complex, and the prestressed anchor bars are exposed for a long time and cannot be replaced. This can easily cause the prestressed anchor bars to rust or become damaged, and the quality of prestressing cannot be guaranteed.

[0004] These two construction methods can only be used to strengthen the structure or install specialized seismic isolation devices on the piers to resist earthquakes. Increasing structural strength leads to a sharp increase in the cost of the piers, while installing specialized seismic isolation devices places the sole responsibility for structural safety on these devices. Once these devices fail, the structure becomes unsafe, placing extremely high demands on the isolation devices and increasing bridge maintenance costs. Furthermore, installing seismic isolation devices takes up space between the piers and beams, affecting the aesthetics. Summary of the Invention

[0005] In order to overcome the above-mentioned shortcomings of the prior art, the present invention proposes a replaceable and shock-absorbing prestressed anchor system for prefabricated assembly and its installation and replacement construction method to solve the problems of poor shock absorption effect, complicated construction steps and poor safety performance of the existing anchor structure.

[0006] The present invention is achieved through the following technical solutions:

[0007] A replaceable and shock-absorbing prestressed anchoring system for prefabricated assembly includes a fixed-end anchoring assembly, a tensioning-end anchoring assembly, and a prestressed anchor bar assembly located between the fixed-end anchoring assembly and the tensioning-end anchoring assembly.

[0008] The fixed end anchor assembly includes a lower protective cover, a split slider and a fixed end anchor sleeve, the split slider is located inside the lower protective cover and is slidably connected to the lower protective cover, the lower protective cover is fixed to the fixed end anchor sleeve on its upper part by bolts, and the upper part of the fixed end anchor sleeve is connected to the embedded pipe;

[0009] The prestressed anchor bar assembly includes a prestressed anchor bar located in a pre-buried pipe, and a guide head is fixed to the bottom of the prestressed anchor bar;

[0010] The tensioning end anchoring assembly includes a tensioning end anchoring sleeve provided at the end of the embedded pipe, the top of the prestressed anchor bar passes through the tensioning end anchoring sleeve, and the prestressed anchor bar is connected to the tensioning end anchoring sleeve through the tensioning end anchor head.

[0011] Furthermore, the split slider includes a cylinder with a hole in the center formed by combining three or more sliders, and the central upper end of the cylinder is provided with an inverted cone shape consistent with the shape of the guide head, so that the guide head can be smoothly inserted into the split slider; a groove is provided on the outer side of the circumference of each slider, and a spring and a conductor coil are built into the groove; the conductor coil wiring is externally placed in a protective cover outside the pedestal, or retained above the pier through a pre-buried pipe.

[0012] Furthermore, a wear-resistant plate is embedded in the bottom of the split sliding block, and the wear-resistant plate and the stainless steel plate in the lower protective cover form a sliding pair.

[0013] Furthermore, the prestressed anchor bars are made of high-strength structural steel with a yield stress greater than 400 MPa and less than 800 MPa. Q460 steel is preferred, and the prestressed bars can be made from hot-rolled steel plates. During design earthquakes and above, the material yields, undergoing plastic deformation to dissipate seismic energy. This plastic deformation also significantly increases the period of the structure, thereby reducing the seismic energy absorbed by the structure.

[0014] Furthermore, the pre-buried pipeline is composed of pre-buried pipes or channels formed when the segmental bridge piers and columns are prefabricated.

[0015] Furthermore, the tensioning end anchor sleeve and the fixed end anchor sleeve are both pre-embedded in concrete through spiral reinforcement.

[0016] Furthermore, an anchoring clip is provided between the tensioning end anchor head and the prestressed anchor bar.

[0017] Furthermore, the prestressed anchor bar is threadedly connected to the guide head; the cross section of the prestressed anchor bar is square or circular, and the prestressed anchor bar is circular near the tensioning end.

[0018] A method for installing and constructing a replaceable prestressed anchor for a prefabricated assembled bridge pier comprises the following steps:

[0019] S01: First, assemble the components of the split slider, then place them in the lower protective cover. Fix the lower protective cover to the fixed end anchor sleeve with bolts, and then embed it in the bridge pier together with the spiral reinforcement and embedded pipes.

[0020] S02: Prefabricated segmental piers or entire columns, with pre-reserved holes or pre-buried pipes in the segmental piers or columns;

[0021] S03: At the construction site, the concrete segments are hoisted to the location of the bridge piers one by one, or the entire column is hoisted to the location of the column;

[0022] S04: The prefabricated prestressed anchor bar with a guide head is passed from top to bottom through the embedded pipe. The guide head squeezes the split slider, thereby compressing the spring and pushing the split slider apart. When the guide head passes through the split slider head, the split slider gathers toward the center under the action of the spring, thereby clamping the guide head.

[0023] S05: Install the tensioning end anchor sleeve, tensioning end anchor head and anchor clip at the upper end of the prestressed anchor bar, and use tensioning equipment and furniture to perform anchor tensioning. After tensioning is completed, an anchor unit is formed.

[0024] S06: Set up a sealing cover at the tensioning end and grout to seal it.

[0025] A replacement construction method for prestressed anchors for replaceable prefabricated assembled bridge piers specifically comprises the following steps:

[0026] S11: Use the tensioning equipment to loosen the tensioning end, and then remove the anchor clip, the tensioning end anchor head and the tensioning end anchor sleeve;

[0027] S12: Cut the prestressed anchor bars at the embedded pipes of the concrete pier;

[0028] S13: Connect the external conductor coil to the power supply, so that the conductor coil generates a magnetic force to attract the split slider away from the center, thereby pulling out the guide head;

[0029] S14: Prestressed anchor bars are made. The prestressed anchor bars with guide heads are inserted from top to bottom through the embedded pipe. The guide heads squeeze the split sliders, thereby compressing the springs and pushing the split sliders apart. After the guide heads pass through the split slider heads, the split sliders gather toward the center under the action of the springs, thereby locking the guide heads.

[0030] S15: Install the tensioning end anchor sleeve, tensioning end anchor head and anchor clip at the upper end of the prestressed anchor bar, and use tensioning equipment and furniture to perform anchor tensioning. After tensioning is completed, an anchor unit is formed.

[0031] S16: Set up a sealing cover at the tensioning end and grout to seal it.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] (1) The replaceable and shock-absorbing prestressed anchoring system for prefabricated assembly proposed by the present invention adopts high-strength structural steel. By selecting the cross-sectional size and yield strength of the material, the prestressed anchor bars can enter into yielding and undergo plastic deformation in the design earthquake or above, thereby causing the bridge piers and abutments to rotate at a certain angle, significantly increasing the natural vibration period of the bridge structure, thereby greatly reducing the seismic energy absorbed by the structure; at the same time, the prestressed anchor bars enter into yielding, which will convert the seismic energy into strain energy of the material and absorb the seismic energy;

[0034] (2) The replaceable and shock-absorbing prestressed anchoring system for prefabricated assembly proposed by the present invention embeds the conductor coil in the fixed end anchor head. When replacement is required (such as after an earthquake), the conductor coil can be energized to move the split slider away from the center, allowing the guide head of the prestressed anchor bar to be pulled out. The setting of the spring allows for easy installation of the new prestressed anchor bar. The entire replacement process is simple in steps, easy to operate, and time-saving.

[0035] (3) The present invention perfectly conforms to the modular construction concept and can enable segmental bridge piers or columns to be prefabricated in a beam factory. Under factory conditions, the impact of the environment on the bridge piers is reduced, the quality requirements of the products can be improved, and the operation can be streamlined, thereby improving the standardized manufacturing of bridges. At the same time, on-site construction can be carried out in parallel with prefabrication in the beam factory, shortening the construction period of the bridge and saving a lot of manpower costs.

[0036] (4) The prestressed anchor of the present invention can be used not only for modular manufacturing of bridges, but also for projects such as buildings, dams, large concrete shells, etc. that require vertical or horizontal prestressed (such as floor panels of large-span structures) anchoring systems with seismic isolation or replaceable functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic structural diagram of a replaceable, shock-absorbing prestressed anchoring system for prefabricated assembly according to an embodiment of the present invention;

[0038] Figure 2 for Figure 1 Middle AA view;

[0039] Figure 3 It is a front view of the split slider according to an embodiment of the present invention;

[0040] Figure 4 for Figure 3 Middle BB view;

[0041] Figure 5 A front view of the lower protective cover according to an embodiment of the present invention;

[0042] Figure 6 It is a left side view of the lower protective cover according to an embodiment of the present invention;

[0043] Figure 7 This is a schematic diagram of the arrangement of the replaceable prestressed anchor for prefabricated assembled bridge piers according to an embodiment of the present invention in a bridge pier;

[0044] Figure 8 This is a schematic diagram of the arrangement of the replaceable prestressed anchor for prefabricated assembled bridge piers according to an embodiment of the present invention in another type of bridge pier.

[0045] In the picture:

[0046] 1. Lower protective cover; 2. Guide head; 31. Split slider; 32. Groove; 33. Spring; 34. Conductor coil; 35. Wear-resistant plate; 4. Bolt; 5. Fixed-end anchor sleeve; 6. Conductor coil connection; 7. Embedded pipe; 8. Prestressed anchor bar; 9. Spiral bar; 10. Tensioning-end anchor sleeve; 11. Tensioning-end anchor head; 12. Anchor clip; 13. Cap; 14. Concrete lower segment; 15. Concrete upper segment; 16. Stainless steel plate. DETAILED DESCRIPTION

[0047] Examples are provided to illustrate certain embodiments of the present invention and should not be construed as limiting the scope of the present invention. The disclosed content of the present invention may be modified from materials, methods, and reaction conditions simultaneously, and all such modifications should fall within the spirit and scope of the present invention.

[0048] like Figure 1-6 As shown, a replaceable and shock-absorbing prestressed anchoring system for prefabricated assembly includes a fixed-end anchoring assembly, a tensioning-end anchoring assembly, and a prestressed anchor bar assembly located between the fixed-end anchoring assembly and the tensioning-end anchoring assembly.

[0049] The fixed end anchor assembly includes a lower protective cover 1, a split slider 31 and a fixed end anchor sleeve 5. The split slider 31 is located inside the lower protective cover 1 and is slidably connected to the lower protective cover 1. The lower protective cover 1 is fixed to the fixed end anchor sleeve 5 on its upper portion by bolts 4. The upper portion of the fixed end anchor sleeve 5 is connected to the embedded pipe 7.

[0050] The prestressed anchor bar assembly includes prestressed anchor bars 8 located within a pre-buried conduit 7, with a guide head 2 fixed to the bottom of the prestressed anchor bar 8. The prestressed anchor bar 8 should be made of high-strength structural steel with a yield stress greater than 400 MPa and less than 800 MPa, preferably Q460. The prestressed anchor bar 8 can be made from hot-rolled steel plates. During design earthquakes and above, the material yields and undergoes plastic deformation, thereby consuming seismic energy. This plastic deformation also significantly increases the period of the structure, thereby reducing the seismic energy absorbed by the structure. The prestressed anchor bar 8 should be replaced after the earthquake.

[0051] The tensioning end anchoring assembly includes a tensioning end anchoring sleeve 10 provided at the end of the embedded pipe 7. The top of the prestressed anchor bar 8 passes through the tensioning end anchoring sleeve 10. The prestressed anchor bar 8 is connected to the tensioning end anchoring sleeve 10 through the tensioning end anchor head 11.

[0052] The split slider 31 includes a cylinder with a hole in the center formed by combining three or more sliders. The upper center end of the cylinder is provided with an inverted cone shape consistent with the shape of the guide head 2, so that the guide head 2 can be smoothly inserted into the split slider 31; the middle and lower part of the cylinder is a smaller circular hole; so that the guide head 2 can be smoothly inserted into the split slider 31; a groove 32 is provided on the outer side of the circumference of each slider, and a spring 33 and a conductor coil 34 are built into the groove 32; the conductor coil connection 6 is externally placed in a protective device outside the base 13, or retained above the pier through a pre-buried pipe.

[0053] A wear-resistant plate 35 is embedded at the bottom of the split sliding block 31 , and the wear-resistant plate 35 and the stainless steel plate 16 in the lower protective cover 1 form a sliding pair.

[0054] The pre-buried pipeline 7 is composed of a pre-buried pipe or a channel formed when the segment bridge piers and columns are prefabricated.

[0055] The tensioning end anchor sleeve 10 and the fixed end anchor sleeve are both pre-embedded in concrete through the spiral reinforcement 9 .

[0056] An anchoring clip 12 is further provided between the tensioning end anchor head 11 and the prestressed anchor bar 8 .

[0057] The prestressed anchor bar 8 is threadedly connected to the guide head 2; the cross section of the prestressed anchor bar 8 is square or circular, and the prestressed anchor bar 8 is circular near the tensioning end to facilitate tensioning.

[0058] A method for installing and constructing a replaceable prestressed anchor for a prefabricated assembled bridge pier comprises the following steps:

[0059] S01: First, assemble the components of the split slider 31, then place it in the lower protective cover 1, fix the lower protective cover 1 to the fixed end anchor sleeve 5 by bolts 4, and then pre-embed it together with the spiral reinforcement 9 and the pre-embedded pipe 7 in the bridge pedestal 13; the pre-embedded position of the prestressed anchor can be but is not limited to Figure 7 or Figure 8 As shown in the figure, the number of prestressed anchors used can vary depending on the magnitude of the earthquake force and the choice of anchor bars. In general, the prestressed anchor system should be arranged symmetrically.

[0060] S02: Precast concrete lower segment 14 and concrete upper segment 15. The number of segments of the segmental pier is not limited. Pre-reserved holes or pre-buried pipes 7 are left in the concrete lower segment 14 and the concrete upper segment 15.

[0061] S03: hoisting the lower concrete segment 14 and the upper concrete segment 15 to the location of the bridge pier in sequence at the construction site;

[0062] S04: The prefabricated prestressed anchor bar 8 with the guide head 2 is passed from top to bottom through the embedded pipe 7. The guide head 2 squeezes the split slider 31, thereby compressing the spring 33 and pushing the split slider 31 apart. After the guide head 2 passes through the split slider 31, the split slider 31 gathers toward the center under the action of the spring 33, thereby clamping the guide head 2.

[0063] S05: Install the tensioning end anchor sleeve 10, the tensioning end anchor head 11 and the anchor clip 12 on the upper end of the prestressed anchor bar 8, and use tensioning equipment and furniture to perform anchor tensioning. After tensioning is completed, an anchor unit is formed;

[0064] S06: Set up a sealing cover at the tensioning end and grout to seal it.

[0065] A replacement construction method for prestressed anchors for replaceable prefabricated assembled bridge piers specifically comprises the following steps:

[0066] S11: Use the tensioning equipment to loosen the tensioning end, and then remove the anchor clip 12, the tensioning end anchor head 11 and the tensioning end anchor sleeve 10;

[0067] S12: Cutting the prestressed anchor bars 8 at the pre-buried pipes 7 of the concrete pier;

[0068] S13: Connect the external conductor coil connection 6 to electricity, and the conductor coil 34 generates a magnetic force to attract the split slider 31 away from the center, thereby pulling out the guide head 2;

[0069] S14: Prestressed anchor bar 8 is manufactured. The prestressed anchor bar 8 with the guide head 2 is passed from top to bottom through the embedded pipe 7. The guide head 2 squeezes the split slider 31, thereby compressing the spring 33 and pushing the split slider 31 apart. After the guide head 2 passes through the split slider 31, the split slider 31 gathers toward the center under the action of the spring 33, thereby clamping the guide head 2.

[0070] S15: Install the tensioning end anchor sleeve 10, the tensioning end anchor head 11 and the anchor clip 12 on the upper end of the prestressed anchor bar 8, and use tensioning equipment and furniture to perform anchor tensioning. After tensioning is completed, an anchor unit is formed;

[0071] S16: Set up a sealing cover at the tensioning end and grout to seal it.

[0072] In summary, the replaceable prefabricated prestressed anchor for assembled bridge piers in the present application has a simple structure and a clear division of force, which can greatly simplify the construction steps and reduce the construction period. The anchoring system of the present invention has a shock-absorbing function and can be quickly replaced after an earthquake, thereby ensuring the quality of the project while saving the project cost.

[0073] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention's description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A replaceable, shock-absorbing prestressed anchoring system for prefabricated assemblies, characterized in that: It includes a fixed-end anchor assembly, a tensioning-end anchor assembly, and a prestressed anchor bar assembly located between the fixed-end anchor assembly and the tensioning-end anchor assembly. The fixed end anchoring assembly comprises a lower protective cover (1), a split slider (31) and a fixed end anchoring sleeve (5); the split slider (31) is located inside the lower protective cover (1) and is slidably connected to the lower protective cover (1); the lower protective cover (1) is fixedly connected to the fixed end anchoring sleeve (5) on its upper portion by bolts (4); the upper portion of the fixed end anchoring sleeve (5) is connected to the pre-buried pipe (7); The prestressed anchor bar assembly comprises a prestressed anchor bar (8) located in a pre-buried pipe (7), and a guide head (2) is fixed to the bottom of the prestressed anchor bar (8); The tensioning end anchoring assembly comprises a tensioning end anchoring sleeve (10) provided at the end of the embedded pipe (7); the top of the prestressed anchor bar (8) passes through the tensioning end anchoring sleeve (10); and the prestressed anchor bar (8) is connected to the tensioning end anchoring sleeve (10) via a tensioning end anchor head (11); The split slider (31) comprises a cylinder with a hole in the center formed by combining three or more sliders, and the central upper end of the cylinder is provided with an inverted cone shape consistent with the shape of the guide head (2) so that the guide head (2) can be smoothly inserted into the split slider (31); a groove (32) is provided on the outer circumference of each slider, and a spring (33) and a conductor coil (34) are built into the groove (32); the conductor coil connection (6) is externally placed in a protective device outside the pedestal (13), or retained above the bridge pier through a pre-buried pipe; The pre-buried pipeline (7) is composed of a pre-buried pipe or a channel formed when the segment bridge piers and columns are prefabricated; The prestressed anchor bar (8) is threadedly connected to the guide head (2); the cross section of the prestressed anchor bar (8) is square or circular, and the prestressed anchor bar (8) is circular near the tensioning end.

2. The replaceable and shock-absorbing prestressed anchoring system for prefabricated assembly according to claim 1 is characterized in that: A wear-resistant plate (35) is embedded in the bottom of the split sliding block (31), and the wear-resistant plate (35) and the stainless steel plate (16) in the lower protective cover (1) form a sliding pair.

3. The replaceable and shock-absorbing prestressed anchoring system for prefabricated assembly according to claim 1 is characterized in that: The material of the prestressed anchor bar (8) is high-strength structural steel, the yield stress of the high-strength structural steel is greater than 400Mpa and less than 800Mpa. During a design earthquake or above, the material enters yielding and undergoes plastic deformation, thereby consuming earthquake energy.

4. The replaceable and shock-absorbing prestressed anchoring system for prefabricated assembly according to claim 1 is characterized in that: The tensioning end anchor sleeve (10) and the fixed end anchor sleeve are both pre-buried in concrete via spiral reinforcement (9).

5. The replaceable and shock-absorbing prestressed anchoring system for prefabricated assembly according to claim 1 is characterized in that: An anchoring clip (12) is also provided between the tensioning end anchor head (11) and the prestressed anchor bar (8).

6. The installation and construction method of the replaceable and shock-absorbing prestressed anchor system for prefabricated assembly according to any one of claims 1 to 5, characterized in that: The specific steps include: S01: First, assemble the components of the split slider (31), then place them in the lower protective cover (1), fix the lower protective cover (1) to the fixed end anchor sleeve (5) by bolts (4), and then pre-embed them together with the spiral reinforcement (9) and the pre-embedded pipe (7) in the bridge pier (13); S02: Prefabricated segmental piers or entire columns, with pre-reserved holes or pre-buried pipes (7) in the segmental piers or columns; S03: At the construction site, the concrete segments are hoisted to the location of the bridge piers one by one, or the entire column is hoisted to the location of the column; S04: The prefabricated prestressed anchor bar (8) with the guide head (2) is inserted from top to bottom through the pre-buried pipe (7), and the guide head (2) squeezes the split slider (31), thereby compressing the spring (33) and squeezing the split slider (31) apart. After the guide head (2) passes through the head of the split slider (31), the split slider (31) gathers toward the center under the action of the spring (33) and thus clamps the guide head (2); S05: Installing a tensioning end anchor sleeve (10), a tensioning end anchor head (11) and an anchor clip (12) on the upper end of the prestressed anchor bar (8), and performing anchor tensioning using tensioning equipment and furniture, forming an anchor unit after tensioning is completed; S06: Set up a sealing cover at the tensioning end and grout to seal it.

7. The replacement construction method of the replaceable and shock-absorbing prestressed anchor system for prefabricated assembly according to any one of claims 1 to 6, characterized in that: The specific steps include: S11: using a tensioning device to loosen the tensioning end, and then taking out the anchor clip (12), the tensioning end anchor head (11) and the tensioning end anchor sleeve (10); S12: cutting the prestressed anchor bars (8) at the pre-buried pipes (7) of the concrete pier; S13: Connecting the external conductor coil connection (6) to electricity, the conductor coil (34) generates a magnetic force to attract the split slider (31) away from the center, thereby pulling out the guide head (2); S14: Prestressed anchor bar (8) is made. The prestressed anchor bar (8) with the guide head (2) is passed from top to bottom through the pre-buried pipe (7). The guide head (2) squeezes the split slider (31), thereby compressing the spring (33) and squeezing the split slider (31). After the guide head (2) passes through the head of the split slider (31), the split slider (31) gathers toward the center under the action of the spring (33) and thus clamps the guide head (2); S15: Installing a tensioning end anchor sleeve (10), a tensioning end anchor head (11) and an anchor clip (12) on the upper end of the prestressed anchor bar (8), and performing anchor tensioning using tensioning equipment and furniture, forming an anchor unit after tensioning is completed; S16: Set up a sealing cover at the tensioning end and grout to seal it.

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