Assembled adjustable cable anchoring device and installation method

Abstract

An assembled adjustable cable anchoring device and installation method, belonging to the field of structural testing, includes an outer anchoring frame, an inner assembly frame, an adjusting bolt, a clip anchor, and an anchoring adhesive. The outer anchoring frame is provided with an end anchor hole and an anchor block; the inner assembly frame is provided with an inner anchor hole; both the end anchor hole and the inner anchor hole are tapered holes; the inner assembly frame is placed on the anchor block of the outer anchoring frame and connected via an adjusting bolt; the cable passes through the inner anchor hole and the end anchor hole and is initially locked at the end anchor hole using a clip anchor. The cable is bonded to the inner assembly frame at the inner anchor hole using an anchoring adhesive; when the cable is tensioned, the inner assembly frame and the outer anchoring frame form a multi-stage anchoring system for the cable, and the tensioning force of each anchoring section is adjusted by adjusting the screwing degree of the adjusting bolts on different inner assembly frames. The present invention realizes a multi-stage force transmission and adjustable anchoring system for the cable. The anchoring adhesive bonding on the inner assembly frame reduces stress concentration in the anchoring section of the cable, avoiding the problem of fatigue fracture in the anchoring section caused by the clip anchor squeezing the cable stress concentration.

Description

Technical Field

[0001] The present invention belongs to the field of structural testing, and in particular relates to an assembled adjustable cable anchoring device and an installation method. Background Art

[0002] With the continuous advancement of bridge and long-span spatial structure construction technology in my country, the application of prestressed cables has rapidly developed, finding widespread application in prestressed concrete structures, long-span cable-stayed bridges, suspension bridges, and spatial cable-stayed structures. In many applications, cables are the primary load-bearing components, and their mechanical, service, and fatigue properties are crucial for the safe operation and service performance of prestressed structures or cable-supported bridges. Therefore, pre-application performance evaluation and performance testing of damaged cables are becoming increasingly important. However, existing cable tensioning and performance testing methods primarily utilize traditional loading methods using steel plates or steel rods, specifically direct clamping with threaded clamps for anchoring and tensioning. Due to the multi-wire twisted construction of the cable, the outer surface of the cable presents an irregular arrangement of multiple wires. Traditional clamping methods can cause strong stress concentrations and localized indentations in the outer wires of the clamping section. This can easily lead to wire breakage or premature failure during subsequent high-stress tensioning or fatigue testing, making it difficult to effectively test the performance of the test section. The present invention provides an assembled adjustable cable anchoring device and an installation method to achieve end uniform anchoring and multi-stage dispersed conduction of anchoring force in cable performance testing. Summary of the Invention

[0003] The technical problem addressed by this invention is that clip anchors used in traditional cable breakage or fatigue testing are prone to stress concentration in the clamping section, leading to premature wire breakage or breakage. To achieve uniform stress distribution and reduce stress concentration in the cable anchoring section, an assembled adjustable cable anchoring device and installation method are proposed. This device achieves multi-level force transmission and zoned load adjustment within the anchoring section.

[0004] The technical solution adopted by the present invention to solve its technical problems is: an assembled adjustable cable anchoring device, including an outer anchoring frame, an inner assembly frame, an adjusting bolt, a clip anchor and an anchoring glue; the outer anchoring frame is provided with an end anchor hole and an anchor block; the inner assembly frame is provided with an inner anchor hole; the end anchor hole and the inner anchor hole are both tapered holes; the inner assembly frame is placed on the anchor block of the outer anchor frame and is connected by an adjusting bolt; the cable passes through the inner anchor hole and the end anchor hole, and is preliminarily locked at the end anchor hole with a clip anchor, and the cable is bonded to the inner assembly frame at the inner anchor hole with an anchoring glue; when the cable is tensioned, the inner assembly frame and the outer anchor frame form a multi-stage anchoring system for the cable, and the degree of screwing of the adjusting bolts on different inner assembly frames is adjusted to adjust the tensioning force of each anchoring section.

[0005] Furthermore, the external anchoring frame is a double-limb anchoring frame or a four-limb anchoring frame, and anchor blocks are arranged at intervals on the inner side of each limb. The anchor blocks are connected to the external anchoring frame by welding or casting, and threaded holes matching the adjusting bolts are opened on the anchor blocks along the direction parallel to the limbs of the external anchoring frame; the heights of the anchor blocks on different limbs are the same.

[0006] Furthermore, a clamping plate is provided at the end of the outer anchoring frame, and the clamping plate is connected to the outer anchoring frame by welding or casting.

[0007] Furthermore, the end anchor hole is arranged at the center position of the end of the outer anchor frame; the end anchor hole is a tapered hole structure with a small hole toward the inside and a large hole toward the outside, and the slope of the tapered hole wall is consistent with the outer slope of the clip anchor.

[0008] Furthermore, the inner assembly frame is an X-shaped inner assembly frame or a cross-shaped inner assembly frame, the outer end size of the inner assembly frame is 5-10 mm smaller than the inner distance size of the outer anchor frame, the outer end of the inner assembly frame limb corresponds to the position of the anchor block in the outer anchor frame limb, and the inner assembly frame can be placed on the anchor block of the outer anchor frame during installation.

[0009] Furthermore, the inner assembly frame has slots on both sides of the outer ends of the limbs, the centers of the slots correspond to the centers of the threaded holes of the outer anchor frame, the hole depth is less than 1 / 4 times the thickness of the inner assembly frame, and the inner hole diameter is 1-2 mm larger than the outer diameter of the adjusting bolt.

[0010] Furthermore, a pressure sensor is provided in the slot hole at the outer end of the limb of the inner assembly frame, and the pressure sensor monitors the thrust of the adjusting bolt during the tightening process of the adjusting bolt. The sum of the thrusts of the limb ends on the same inner assembly frame is the anchoring force transmitted by the inner assembly frame of this level.

[0011] Furthermore, the inner anchor hole is located at the center of the inner assembly frame, and has a tapered hole structure with a small hole toward the outer anchor frame opening and a large hole toward the end anchor hole. The diameter of the small hole is 2-3 mm larger than the outer diameter of the cable.

[0012] Furthermore, the anchoring glue is a modified epoxy adhesive with a compressive strength of >65MPa and a tensile strength of >30MPa.

[0013] The present invention also provides a method for installing the assembled adjustable cable anchoring device, comprising the following steps:

[0014] S1: Determine the number n of internal assembly racks to be set;

[0015] S2: Pass the cable through the inner anchor holes of n inner assembly frames, with the cable ends passing through the small holes of the inner anchor holes and out through the large holes;

[0016] S3: Control the spacing between adjacent internal assembly frames, pour anchor glue into the internal anchor holes, fill the gap between the internal anchor holes and the cables, and let it cure statically until the anchor glue reaches 85% of the design strength;

[0017] S4: Pass the end of the cable through the inner side of the outer anchor frame, screw the adjusting bolt into the anchor head of the outer anchor frame until the protrusion is 1-2mm, and place n inner assembly frames one by one on the corresponding anchor blocks of the outer anchor frame. Insert the adjusting bolt end into the slot at the outer end of the inner assembly frame;

[0018] S5: Slide the clip anchor onto the outside of the cable and adjust the position of the clip anchor so that the clip anchor falls into the end anchor hole of the outer anchor frame;

[0019] S6: Place the cable anchoring device connected to the cable into the tensile testing machine, and clamp the clamping plate of the tensile testing machine;

[0020] S7: applying tension to 30% of the predetermined tension, so that the clip anchors are initially anchored tight, and the n internal assembly frames are pressed tightly against the corresponding anchor blocks;

[0021] S8: Preliminary adjustment is performed on the screwing degree of the adjusting bolt based on the value of the pressure sensor in the slot hole at the outer end of the inner assembly frame so that the forces on the outer ends of the inner assembly frame are balanced;

[0022] S9: Continue to tension the cable anchoring device to a predetermined tension by stretching the clamping plate, and gradually adjust the corresponding adjusting bolts of each inner assembly frame so that the anchoring force transmitted by each inner assembly frame reaches a predetermined value.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The anchoring device can realize the gradual and multi-level force transmission in the cable anchoring section to reduce the load-bearing size of the anchoring sections at each level. The cables near the cable test section mainly adopt the anchoring glue bonding method to reduce the stress concentration in the cables. The anchoring force transmitted by the internal assembly frames at each level can be monitored in real time. The use of multiple assembled internal assembly frames and the configuration of adjustment bolts can realize load adjustment between the anchoring sections at each level. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic structural elevation diagram of Example 1 of the assembled adjustable cable anchoring device of the present invention;

[0026] Figure 2 This is a schematic diagram of the assembled adjustable cable anchoring device embodiment 1 of the present invention after assembly and installation;

[0027] Figure 3 yes Figure 1 Schematic diagram of the X-shaped inner assembly frame of Example 1;

[0028] Figure 4 yes Figure 1 Schematic diagram of bonding the X-shaped inner assembly frame and the cable of Example 1;

[0029] Figure 5 yes Figure 1 Schematic diagram of the double-limb external anchoring frame of Example 1;

[0030] Figure 6 yes Figure 1 A schematic cross-sectional view of the X-shaped inner assembly frame and the double-limb outer anchoring frame of Example 1 after installation;

[0031] Figure 7 This is a schematic structural elevation diagram of Example 2 of the assembled adjustable cable anchoring device of the present invention;

[0032] Figure 8 This is a schematic diagram of the assembled adjustable cable anchoring device embodiment 2 of the present invention after assembly and installation;

[0033] Figure 9 yes Figure 7 A schematic diagram of a cross-shaped inner assembly frame of Example 2 is shown;

[0034] Figure 10 yes Figure 7 Schematic diagram of bonding the cross-shaped inner assembly frame and the cable of Example 2;

[0035] Figure 11 yes Figure 7 Schematic diagram of the external anchoring frame for limbs of Example 2;

[0036] Figure 12 yes Figure 7 A schematic cross-sectional view of the cross-shaped internal assembly frame and the limb external anchoring frames of Example 2 after installation;

[0037] Description of reference numerals in the figures:

[0038] 11. External anchorage for both limbs; 12. External anchorage for all limbs; 21. X-shaped internal assembly frame; 211. First X-shaped internal assembly frame; 212. Second X-shaped internal assembly frame; 213. Third X-shaped internal assembly frame; 22. Cross-shaped internal assembly frame; 221. First cross-shaped internal assembly frame; 222. Second cross-shaped internal assembly frame; 223. Third cross-shaped internal assembly frame; 3. Adjusting bolt; 4. Clip anchor; 5. Anchoring glue; 6. Cable; 7. End anchor hole; 8. Internal anchor hole; 9. Anchor block; 10. Pressure sensor; 13. Clamping plate; 14. Tensile testing machine; 15. Cable anchoring device one; 16. Cable anchoring device two. DETAILED DESCRIPTION

[0039] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0040] Reference Figures 1-12, an assembled adjustable cable anchoring device, comprising an outer anchoring frame, an inner assembly frame, an adjusting bolt 3, a clip anchor 4 and an anchoring glue 5; the outer anchoring frame is provided with an end anchor hole 7 and an anchor block 9; the inner assembly frame is provided with an inner anchor hole 8; the end anchor hole 7 and the inner anchor hole 8 are both tapered holes; the inner assembly frame is placed on the anchor block 9 of the outer anchoring frame and is connected by an adjusting bolt 3; the cable 6 passes through the end anchor hole 7 and the inner anchor hole 8, and is preliminarily locked at the end anchor hole 7 by using the clip anchor 4, and the cable 6 is bonded to the inner assembly frame at the inner anchor hole 8 by using the anchoring glue 5; when the cable 6 is tensioned, the inner assembly frame and the outer anchoring frame form a multi-stage anchoring system for the cable 6, and the tensioning force of the anchoring sections at each level is adjusted by adjusting the degree of screwing of the adjusting bolts 3 on different inner assembly frames.

[0041] The external anchoring frame includes two types: a double-limb external anchoring frame 11 and a four-limb external anchoring frame 12. Anchor blocks 9 are arranged at intervals L on the inner side of each limb. The anchor blocks 9 are connected to the external anchoring frame by welding or casting. Threaded holes matching the adjusting bolts 3 are opened on the anchor blocks 9 along the direction parallel to the limbs of the external anchoring frame; the heights of the anchor blocks 9 on different limbs are the same.

[0042] The outer anchor frame is provided with a clamping plate 13 at its end, which is welded or cast to the outer anchor frame. The end anchor hole 7 is located at the center of the outer anchor frame end. The end anchor hole 7 is a tapered hole with a small hole toward the inside and a large hole toward the outside. The slope of the tapered hole wall matches the outer slope of the clip anchor 4.

[0043] The internal assembly frame is available in two types: an X-shaped internal assembly frame 21 and a cross-shaped internal assembly frame 22. The outer end of the internal assembly frame is 3-8 mm smaller than the inner end of the external anchor frame. The outer ends of the internal assembly frame legs correspond to the anchor blocks 9 within the external anchor frame legs, allowing the internal assembly frame to rest on the anchor blocks 9 of the external anchor frame during installation. The internal anchor hole 8 is located in the center of the internal assembly frame and has a tapered hole structure with a small hole facing the external anchor frame opening and a large hole facing the end anchor hole 7. The diameter of the small hole is 2-3 mm larger than the outer diameter of the cable 6 to facilitate cable threading.

[0044] Slots are provided on both sides of the outer ends of the inner assembly frame limbs, the center of the slot corresponds to the center of the threaded hole of the outer anchor frame, the hole depth is less than 1 / 4 times the thickness of the inner assembly frame, and the inner hole diameter is 1-2 mm larger than the outer diameter of the adjusting bolt 3; a pressure sensor 10 is provided in the slot, and the pressure sensor 10 monitors the thrust of the adjusting bolt 3 during the tightening process of the adjusting bolt 3.

[0045] The anchoring glue 5 is a modified epoxy adhesive with a compressive strength of >65MPa and a tensile strength of >30MPa.

[0046] Example 1:

[0047] The structural elevation diagram of this embodiment is as follows Figure 1As shown, the schematic diagram after the assembly is completed is as follows Figure 2 As shown, this embodiment is provided with three X-shaped inner assembly frames 21; Figure 3 The figure shows a schematic diagram of an X-shaped inner assembly frame. An inner anchor hole 8 is opened at the center of the X-shaped inner assembly frame 21, and slots are opened on both sides of the outer ends of the limbs of the X-shaped inner assembly frame 21. Pressure sensors 10 are set in the slots to monitor the thrust of the adjusting bolt 3.

[0048] Figure 4 The figure shows a schematic diagram of the bonding between the X-shaped inner assembly frame and the cable. The cable 6 passes through the inner anchor holes 8 in the middle of the three X-shaped inner assembly frames 21 in sequence. The distance L1 between the first X-shaped inner assembly frame 211 and the second X-shaped inner assembly frame 212, the distance L2 between the second X-shaped inner assembly frame 212 and the third X-shaped inner assembly frame 213, and the distance L3 between the third X-shaped inner assembly frame 213 and the end of the cable 6 are controlled to form a multi-stage anchoring system for the cable 6. The cable 6 is pre-bonded to the X-shaped inner assembly frame 21 at the inner anchor hole 8 using anchoring glue 5. The other end of the cable 6 is pre-bonded to the three X-shaped inner assembly frames 21 using the same steps.

[0049] Figure 5 The figure shows a schematic diagram of a double-limb external anchoring frame, in which the clamping plate 13 is welded or cast to the end of the double-limb external anchoring frame 11; an end anchor hole 7 is reserved at the center position of the end of the double-limb external anchoring frame 11; anchor blocks 9 are arranged at intervals L on the inner side of each limb and are welded or cast to the external anchoring frame; the anchor blocks 9 have threaded holes that match the adjusting bolts 3.

[0050] Figure 6 The diagram shows a cross-sectional view of the X-shaped internal assembly frame and the double-limb external anchor frame after installation. After controlling the number and spacing of the X-shaped internal assembly frames 21 and pre-bonding them to the ends of the cable 6, the above components are first installed with a single double-limb external anchor frame 11. The end of the cable 6 is passed through the inside of the double-limb external anchor frame 11, and the adjustment bolt 3 is screwed into the anchor block 9 of the external anchor frame until the protrusion is 1-2 mm. The three X-shaped internal assembly frames 21 are placed on the corresponding anchor blocks 9 of the double-limb external anchor frame 11, and the ends of the adjustment bolts 3 are inserted into the slots at the outer ends of the limbs. The clip anchor 4 is inserted into the outside of the cable 6 and adjusted so that the clip anchor 4 falls into the anchor hole 7 at the end of the double-limb external anchor frame. The other end of the cable 6 is installed with the double-limb external anchor frame 11 in the same manner. The cable anchor device 15 connected to the cable 6 is placed in the tensile testing machine 14, and the tensile testing machine fixture clamps the clamping plates 13 at both ends.

[0051] The tension cable 6 is tensioned, and the X-shaped inner assembly frame 21 and the double-limb outer anchor frame 11 form a multi-stage anchoring system for the cable 6; the cable 6 is subjected to the tension force T of the tensile testing machine 14, and the four pressure sensors 10 of the first X-shaped inner assembly frame 211 below the cable 6 monitor the pressures T11, T12, T13, and T14 respectively, and the sum of the pressures is T1. The sum of the pressures monitored by the pressure sensors 10 of the other two X-shaped inner assembly frames 21 is similarly T2 and T3; the tension on the cable 6 section between the first X-shaped inner assembly frame 211 and the second X-shaped inner assembly frame 212 is The tension on the cable section 6 between the second X-shaped inner assembly frame 212 and the third X-shaped inner assembly frame 213 is The tension on the cable section 6 between the third X-shaped inner assembly frame 213 and the end anchor hole 7 is Adjust the different X-shaped inner assembly frame 21 on the adjusting bolt 3 screw into the degree to adjust the tension of the anchoring section at all levels.

[0052] Example 2:

[0053] The structural elevation diagram of this embodiment is as follows Figure 7 As shown, the schematic diagram after the assembly is completed is as follows Figure 8 As shown, this embodiment provides three cross-shaped inner mounting brackets 22; Figure 9 Schematic diagram of a cross-shaped inner assembly frame. An inner anchor hole 8 is opened at the center of the cross-shaped inner assembly frame 22, and slots are opened on both sides of the outer ends of the limbs of the cross-shaped inner assembly frame 22. Pressure sensors 10 are set in the slots to monitor the thrust of the adjusting bolt 3.

[0054] Figure 10 The figure shows a schematic diagram of the bonding between the cross-shaped inner assembly frame and the cable. The cable 6 passes through the inner anchor holes 8 in the middle of the three cross-shaped inner assembly frames 22 in sequence. The distance L1 between the first cross-shaped inner assembly frame 221 and the second cross-shaped inner assembly frame 222, the distance L2 between the second cross-shaped inner assembly frame 222 and the third cross-shaped inner assembly frame 223, and the distance L3 between the third cross-shaped inner assembly frame 223 and the end of the cable 6 are controlled to form a multi-stage anchoring system for the cable 6. The cable 6 is pre-bonded to the cross-shaped inner assembly frame 22 at the inner anchor hole 8 using anchoring glue 5. The other end of the cable 6 is pre-bonded to the three cross-shaped inner assembly frames 22 using the same steps.

[0055] Figure 11 The figure shows a schematic diagram of the external anchoring frame of the limbs, in which the clamping plate 13 is welded or cast to the end of the external anchoring frame 12 of the limbs; an end anchor hole 7 is reserved at the center position of the end of the external anchoring frame 12 of the limbs; an anchor block 9 is arranged at a spacing L on the inner side of each limb, and is welded or cast to the external anchoring frame 12 of the limbs; the anchor block 9 has a threaded hole that matches the adjusting bolt 3.

[0056] Figure 12The figure shows a cross-sectional view of the cross-shaped internal assembly frame and the limb external anchor frame after installation. After controlling the number and spacing of the cross-shaped internal assembly frames 22 and pre-bonding them to the ends of the cable 6, the above components are first installed with a single limb external anchor frame 12; the end of the cable 6 is passed through the inside of the limb external anchor frame 12, and the adjustment bolt 3 is screwed into the anchor block 9 of the external anchor frame until the protrusion is 1-2 mm. The three cross-shaped internal assembly frames 22 are placed on the corresponding anchor blocks 9 of the limb external anchor frame 12, and the ends of the adjustment bolts 3 are inserted into the slots at the outer ends of the limbs; the clip anchor 4 is inserted into the outside of the cable 6, and the position of the clip anchor 4 is adjusted so that the clip anchor 4 falls into the anchor hole 7 at the end of the limb external anchor frame; the other end of the cable 6 is installed with the limb external anchor frame 12 in the same way. The cable anchor device 2 16 connected to the cable 6 is placed in the tensile testing machine 14, and the tensile testing machine clamps the clamping plates 13 at both ends.

[0057] The tension cable 6 is tensioned, and the cross-shaped inner assembly frame 22 and the limb outer anchor frame 12 form a multi-stage anchoring system for the cable 6; the cable 6 is subjected to the tension force T of the tensile machine 14, and the four pressure sensors 10 of the first cross-shaped inner assembly frame 221 below the cable 6 monitor the pressures T11, T12, T13, and T14 respectively, and the sum of the pressures is T1. The sum of the pressures monitored by the pressure sensors 10 of the other two cross-shaped inner assembly frames 22 is similarly T2 and T3; the tension on the cable 6 section between the first cross-shaped inner assembly frame 221 and the second cross-shaped inner assembly frame 222 is The tension on the cable section 6 between the second cross-shaped inner assembly frame 222 and the third cross-shaped inner assembly frame 223 is The tension on the cable section 6 between the third cross-shaped inner assembly frame 223 and the end anchor hole 7 is Adjust the degree of screwing of the adjusting bolt 3 on the different cross-shaped inner assembly frame 22 to adjust the tension of the anchoring section at each level.

[0058] The present invention also provides a method for installing the assembled adjustable cable anchoring device, comprising the following steps:

[0059] S1: Determine the number n of internal assembly racks to be set;

[0060] S2: Pass the cable 6 through the inner anchor holes 8 of the n inner assembly frames, with the ends of the cable 6 passing through the small holes of the inner anchor holes 8 and out through the large holes;

[0061] S3: The adjacent inner assembly frames are arranged with controlled spacing, and the anchoring glue 5 is poured into the inner anchor hole 8 to fill the gap between the inner anchor hole 8 and the cable 6 and allowed to solidify statically until the anchoring glue reaches 85% of the design strength;

[0062] S4: Pass the end of the cable 6 through the inner side of the outer anchor frame, screw the adjusting bolt 3 into the anchor block 9 of the outer anchor frame until the protrusion is 1-2 mm, and place n inner assembly frames one by one on the corresponding anchor blocks 9 of the outer anchor frame, and insert the end of the adjusting bolt 3 into the slot at the outer end of the inner assembly frame;

[0063] S5: Insert the clip anchor 4 onto the outside of the cable and adjust the position of the clip anchor 4 so that the clip anchor 4 falls into the anchor hole 7 at the end of the outer anchor frame;

[0064] S6: The cable anchoring device connected to the cable 6 is placed into the tensioning machine 14, and the clamp of the tensioning machine 14 clamps the clamping plate 13;

[0065] S7: Apply tension to 30% of the predetermined tension, so that the clip anchor 4 is initially anchored and the n inner assembly frames are pressed against the corresponding anchor blocks 9;

[0066] S8: Preliminary adjustment is performed on the screwing degree of the adjusting bolt 3 based on the value of the pressure sensor 10 in the slot hole at the outer end of the inner assembly frame limb, so that the forces on the outer ends of the inner assembly frame 2 are balanced;

[0067] S9: Continue to tension the cable anchoring device to a predetermined tension by stretching the clamping plate 13 , and gradually adjust the corresponding adjusting bolts 3 of each inner assembly frame so that the anchoring force transmitted by each inner assembly frame reaches a predetermined value.

[0068] Although the preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments. The above-mentioned specific embodiments are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, which all fall within the scope of protection of the present invention.

Claims

1. An assembled adjustable cable anchoring device, characterized in that: The invention comprises an outer anchoring frame, an inner assembly frame, an adjusting bolt, a clip anchor and an anchoring glue; the outer anchoring frame is provided with an end anchor hole and an anchor block; the inner assembly frame is provided with an inner anchor hole; the end anchor hole and the inner anchor hole are both tapered holes; the inner assembly frame is placed on the anchor block of the outer anchoring frame and connected by adjusting bolts; the cable passes through the inner anchor hole and the end anchor hole, and is initially locked at the end anchor hole with a clip anchor, and the cable is bonded to the inner assembly frame at the inner anchor hole with an anchoring glue; when the cable is tensioned, the inner assembly frame and the outer anchor frame form a tension on the cable A multi-stage anchoring system adjusts the tension of each anchoring section by adjusting the degree of screwing in of the adjusting bolts on different inner assembly frames; the outer anchoring frame is a two-limb anchoring frame or a four-limb anchoring frame, and anchor blocks are arranged at intervals on the inner side of each limb; the inner assembly frame is an X-shaped inner assembly frame or a cross-shaped inner assembly frame, and the outer end size of the inner assembly frame is 5-10mm smaller than the inner distance size of the outer anchoring frame. The outer ends of the limbs of the inner assembly frame correspond to the positions of the anchor blocks in the limbs of the outer anchoring frame. During installation, the inner assembly frame is placed on the anchor blocks of the outer anchoring frame.

2. The assembled adjustable cable anchoring device according to claim 1, characterized in that: The anchor block is connected to the outer anchor frame by welding or casting. A threaded hole matching the adjusting bolt is provided on the anchor block in a direction parallel to the limbs of the outer anchor frame. The heights of the anchor blocks on different limbs are the same.

3. The assembled adjustable cable anchoring device according to claim 1 or 2, characterized in that: A clamping plate is provided at the end of the outer anchoring frame, and the clamping plate is connected to the outer anchoring frame by welding or casting.

4. The assembled adjustable cable anchoring device according to claim 1 or 2, characterized in that: The end anchor hole is arranged at the center position of the end of the outer anchor frame; the end anchor hole is a tapered hole structure with a small hole toward the inside and a large hole toward the outside, and the slope of the tapered hole wall is consistent with the outer slope of the clip anchor.

5. The assembled adjustable cable anchoring device according to claim 1 or 2, characterized in that: The inner assembly frame has slots on both sides of the outer ends of the limbs. The center of the slots corresponds to the center of the threaded holes of the outer anchor frame. The hole depth is less than 1 / 4 times the thickness of the inner assembly frame. The inner hole diameter is 1-2 mm larger than the outer diameter of the adjusting bolt.

6. The assembled adjustable cable anchoring device according to claim 5, characterized in that: A pressure sensor is provided in the slot at the outer end of the limb of the inner assembly frame. The pressure sensor monitors the thrust of the adjusting bolt during the tightening process of the adjusting bolt. The sum of the thrusts of the limb ends on the same inner assembly frame is the anchoring force transmitted by the inner assembly frame of this level.

7. The assembled adjustable cable anchoring device according to claim 1 or 2, characterized in that: The inner anchor hole is located at the center of the inner assembly frame, and has a tapered hole structure with a small hole toward the outer anchor frame opening and a large hole toward the end anchor hole. The diameter of the small hole is 2-3 mm larger than the outer diameter of the cable.

8. The assembled adjustable cable anchoring device according to claim 1 or 2, characterized in that: The anchoring glue is a modified epoxy adhesive with a compressive strength of >65MPa and a tensile strength of >30MPa.

9. The method for installing the assembled adjustable cable anchoring device according to claims 1 to 8, characterized in that: The following steps are involved: S1: Determine the number n of internal assembly racks to be set; S2: Pass the cable through the inner anchor holes of n inner assembly frames, with the cable ends passing through the small holes of the inner anchor holes and out through the large holes; S3: Control the spacing between adjacent internal assembly frames, pour anchor glue into the internal anchor holes, fill the gap between the internal anchor holes and the cables, and let it cure statically until the anchor glue reaches 85% of the design strength; S4: Pass the end of the cable through the inner side of the outer anchor frame, screw the adjusting bolt into the anchor head of the outer anchor frame until the protrusion is 1-2mm, and place n inner assembly frames one by one on the corresponding anchor blocks of the outer anchor frame. Insert the adjusting bolt end into the slot at the outer end of the inner assembly frame; S5: Slide the clip anchor onto the outside of the cable and adjust the position of the clip anchor so that the clip anchor falls into the end anchor hole of the outer anchor frame; S6: Place the cable anchoring device connected to the cable into the tensile testing machine, and clamp the clamping plate of the tensile testing machine; S7: applying tension to 30% of the predetermined tension, so that the clip anchors are initially anchored tight, and the n internal assembly frames are pressed tightly against the corresponding anchor blocks; S8: Preliminary adjustment is performed on the screwing degree of the adjusting bolt based on the value of the pressure sensor in the slot hole at the outer end of the inner assembly frame so that the forces on the outer ends of the inner assembly frame are balanced; S9: Continue to tension the cable anchoring device to a predetermined tension by stretching the clamping plate, and gradually adjust the corresponding adjusting bolts of each inner assembly frame so that the anchoring force transmitted by each inner assembly frame reaches a predetermined value.

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