Fabricated adjustable inhaul cable anchoring device and mounting method

Abstract

The invention discloses an assembly type adjustable inhaul cable anchoring device and an installation method, and belongs to the field of structure testing. The device comprises an outer anchoring frame, an inner assembly frame, an adjusting bolt, a clamping piece anchor and anchoring glue; an end anchor hole and an anchor block are arranged on the outer anchoring frame; an inner anchor hole is formed in the inner assembly frame; the end anchor holes and the inner anchor holes are conical holes; the inner assembling frame is lapped on the anchor block of the outer anchoring frame and is connected through an adjusting bolt; the inhaul cable penetrates through the inner anchor hole and the end anchor hole and is preliminarily locked at the end anchor hole through a clamping piece anchor, and the inhaul cable is bonded with the inner assembly frame at the inner anchor hole through anchoring glue; when the inhaul cable is tensioned, the inner assembling frames and the outer anchoring frames form a multi-stage anchoring system for the inhaul cable, and the tensioning force of each stage of anchoring section is adjusted by adjusting the screwing degrees of the adjusting bolts on the different inner assembling frames. According to the anchoring system, multi-stage force transmission is achieved for the inhaul cable, all stages are adjustable, anchoring glue is bonded on the inner assembly frame to reduce internal stress concentration of the anchoring section cable, and the problem that an anchoring area is prone to fatigue fracture due to stress concentration when a clamping piece anchor extrudes the inhaul cable is solved.

Description

Technical Field

[0001] The 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 improvement of the construction technology of bridges and large-span spatial structures in my country, the application of prestressed cables has developed rapidly and has been widely used in prestressed concrete structures, large-span cable-stayed bridges, suspension bridges and spatial string structures. In many applications, cables are the main load-bearing components. Their mechanical properties, service performance and fatigue performance are the key to the safe operation and service performance of prestressed structures or cable-supported bridges. Therefore, performance evaluation before application and performance testing of damaged cables are becoming increasingly important. However, in the existing cable tensioning and performance testing methods, the traditional loading method of steel plates or steel bars is mainly adopted, that is, the anchoring and tensioning are carried out by direct clamping with threaded clamps. Due to the multi-wire twisting structure of the cable, the outer surface of the cable is an irregular surface with multiple wires arranged. The traditional clamping method will cause the outer ring steel wire of the clamping section to produce strong stress concentration and local indentation. In the subsequent high-stress tensioning or fatigue test, it is very easy to cause the steel wire of the clamping section to break or be damaged prematurely, making it difficult to achieve the performance test of the effective 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 to be solved by the present invention is that the clip anchor used in the traditional cable breaking or fatigue test is prone to stress concentration in the clamping section, resulting in premature wire breakage or breakage in the clamping section. In order to achieve uniform force on the steel wire in the cable anchoring section and reduce the stress concentration problem, an assembled adjustable cable anchoring device and installation method are proposed to achieve multi-level force transmission in the anchoring section and adjustable load in each section.

[0004] The technical solution adopted by the present invention to solve its technical problems is: an assembled adjustable cable anchoring device, comprising 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 preliminarily locked at the end anchor hole by using a clip anchor, and the cable is bonded to the inner assembly frame at the inner anchor hole by using an anchoring glue; 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 degree of screwing in of the adjusting bolts on different inner assembly frames is adjusted to adjust the tensioning force of each level of anchoring section.

[0005] Furthermore, the external anchor frame is a double-limb anchor frame or a four-limb anchor frame, and anchor blocks are arranged at intervals on the inner side of each limb. The anchor blocks are connected to the external anchor 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 anchor 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, slots are provided on both sides of the outer ends of the inner assembly frame 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, and the inner hole diameter is 1-2 mm larger than the outer diameter of the adjusting bolt.

[0010] Furthermore, a pressure sensor is arranged in the slot hole at the outer end of the inner assembly frame, and the pressure sensor monitors the top thrust of the adjusting bolt during the tightening process of the adjusting bolt. The sum of the top 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 on the opening side of the outer anchor frame and a large hole on the end anchor hole side. 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: 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, and the cable end enters through the small hole of the inner anchor hole and exits through the large hole; S3: Control the spacing between adjacent internal assembly frames, pour anchor glue into the internal anchor hole, fill the gap between the internal anchor hole and the cable and let it stand to solidify, waiting for the anchor glue to reach 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 head is exposed by 1-2mm, and place n inner assembly frames one by one on the corresponding anchor blocks of the outer anchor frame, and insert the end of the adjusting bolt into the slot at the outer end of the inner assembly frame; S5: Slip 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: Put 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 anchor is initially anchored, and the n inner assembly frames are pressed tightly against the corresponding anchor blocks; S8: Preliminarily adjust 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 force on each outer extension end of the inner assembly frame is 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.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The anchoring device can realize gradual and multi-stage force transmission in the cable anchoring section to reduce the load-bearing size of each anchoring section. The cable near the cable test section mainly adopts anchoring glue bonding to reduce stress concentration in the cable. 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 adjusting bolts can realize load adjustment between the anchoring sections at each level. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural elevation diagram of Embodiment 1 of the assembled adjustable cable anchoring device of the present invention; Figure 2 This is a schematic diagram of the assembled adjustable cable anchoring device embodiment 1 of the present invention after assembly and installation; Figure 3 yes Figure 1 A schematic diagram of an X-shaped inner assembly frame of Example 1 is shown; Figure 4 yes Figure 1 A schematic diagram of bonding the X-shaped inner assembly frame and the cable of Example 1 is shown; Figure 5 yes Figure 1 A schematic diagram of a double-limb external anchoring frame of Example 1 is shown; Figure 6 yes Figure 1 The schematic cross-sectional view of the X-shaped inner assembly frame and the double-limb outer anchoring frame of the embodiment 1 after installation is shown; Figure 7 It is a structural elevation diagram of Embodiment 2 of the assembled adjustable cable anchoring device of the present invention; Figure 8 This is a schematic diagram of the assembled adjustable cable anchoring device embodiment 2 of the present invention after assembly and installation is completed; Fig. 9 yes Figure 7 A schematic diagram of a cross-shaped inner assembly frame of Example 2 is shown; Fig.10 yes Figure 7 A schematic diagram of bonding the cross-shaped inner assembly frame and the cable of Example 2 is shown; Fig.11 yes Figure 7 A schematic diagram of the external anchoring frame for limbs of Example 2 is shown; Fig.12 yes Figure 7 A cross-sectional schematic diagram of the cross-shaped inner assembly frame and the limb outer anchoring frame of Example 2 after installation; Description of reference numerals in the figures: 11. Double-limb external anchorage frame; 12. Four-limb external anchorage frame; 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

[0016] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0017] Reference Figure 1-Figure 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 connected by the 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 each anchoring section is adjusted by adjusting the screwing degree of the adjusting bolts 3 on different inner assembly frames.

[0018] 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 a spacing 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.

[0019] The end of the outer anchor frame is provided with a clamping plate 13, and the clamping plate 13 is connected to the outer anchor frame by welding or casting. The end anchor hole 7 is provided at the center of the end of the outer anchor frame; the end anchor hole 7 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 4.

[0020] The inner assembly frame includes two types: an X-shaped inner assembly frame 21 and a cross-shaped inner assembly frame 22. The outer end size of the inner assembly frame is 3-8 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 9 in the outer anchor frame limb. During installation, the inner assembly frame can be placed on the anchor block 9 of the outer anchor frame. The inner anchor hole 8 is opened at the center of the inner assembly frame, and has a tapered hole structure with a small hole on the side facing the outer anchor frame opening and a large hole on the side 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.

[0021] The inner assembly frame has slots on both sides of the outer ends of the 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 1-2mm larger than the outer diameter of the adjusting bolt 3; a pressure sensor 10 is arranged in the slot, and the pressure sensor 10 monitors the thrust force of the adjusting bolt 3 during the tightening process of the adjusting bolt 3.

[0022] The anchoring glue 5 is a modified epoxy adhesive with a compressive strength of >65MPa and a tensile strength of >30MPa.

[0023] Embodiment 1: The structural elevation diagram of this embodiment is as follows Figure 1 As shown, the schematic diagram after the assembly and installation 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, in which 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. A pressure sensor 10 is arranged in the slot to monitor the top thrust of the adjusting bolt 3.

[0024] Figure 4The figure shows a schematic diagram of bonding an X-shaped inner assembly frame and a 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, and 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 by using an anchoring glue 5; and the other end of the cable 6 is pre-bonded to the three X-shaped inner assembly frames 21 in the same steps.

[0025] Figure 5 The figure shows a schematic diagram of a double-limb external anchor frame, wherein the clamping plate 13 is welded or cast connected to the end of the double-limb external anchor frame 11; an end anchor hole 7 is reserved at the center position of the end of the double-limb external anchor frame 11; anchor blocks 9 are arranged at intervals L on the inner side of each limb and are welded or cast connected to the external anchor frame; the anchor blocks 9 have threaded holes matching the adjusting bolts 3.

[0026] Figure 6 The schematic cross-sectional view of the X-shaped inner assembly frame and the double-limb outer anchor frame after installation is shown. After the number and spacing of the X-shaped inner assembly frame 21 are controlled and pre-bonded with the two ends of the cable 6, the above-mentioned components are first installed with a single double-limb outer anchor frame 11; the end of the cable 6 is passed through the inner side of the double-limb outer anchor frame 11, and the adjusting bolt 3 is screwed into the anchor block 9 of the outer anchor frame until the head is exposed by 1-2mm, and the three X-shaped inner assembly frames 21 are placed on the corresponding anchor blocks 9 of the double-limb outer anchor frame 11, and the ends of the adjusting 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 double-limb outer anchor frame; the other end of the cable 6 is installed with the double-limb outer anchor frame 11 in the same way. The cable anchor device 15 connected to the cable 6 is placed in the tensile machine 14, and the clamps of the tensile machine clamp the clamping plates 13 at both ends.

[0027] 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 T of the tensile machine 14, and the four pressure sensors 10 of the first X-shaped inner assembly frame 211 at the bottom of the cable 6 monitor the pressures T11, T12, T13, and T14 respectively, and the sum of the pressures is T1, and 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 of 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 6 section between the third X-shaped inner assembly frame 213 and the end anchor hole 7 is Adjust the screwing degree of the adjusting bolt 3 on the different X-shaped inner assembly frame 21 to adjust the tensioning force of each level of the anchoring section.

[0028] Embodiment 2: The structural elevation diagram of this embodiment is as follows Figure 7 As shown, the schematic diagram after the assembly and installation is completed is as follows Figure 8 As shown, this embodiment is provided with three cross-shaped inner mounting frames 22; Fig. 9 It is a 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 cross-shaped inner assembly frame 22. Pressure sensors 10 are arranged in the slots to monitor the top thrust of the adjustment bolt 3.

[0029] Fig.10 The figure shows a schematic diagram of bonding 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, and 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 by using the anchoring glue 5; the other end of the cable 6 is pre-bonded to the three cross-shaped inner assembly frames 22 in the same steps.

[0030] Fig.11 The figure shows a schematic diagram of an external anchoring frame for limbs, wherein the clamping plate 13 is welded or cast connected to the end of the external anchoring frame 12 for limbs; an end anchor hole 7 is reserved at the center position of the end of the external anchoring frame 12 for limbs; anchor blocks 9 are arranged at intervals L on the inner side of each limb and are welded or cast connected to the external anchoring frame 12 for limbs; and a threaded hole matching the adjusting bolt 3 is opened in the anchor block 9.

[0031] Fig.12 The figure shows a cross-shaped internal assembly frame and a limb external anchor frame after installation. After the number and spacing of the cross-shaped internal assembly frame 22 are controlled and pre-bonded with the two ends of the cable 6, the above-mentioned components are first installed with a single limb external anchor frame 12; the end of the cable 6 is passed through the inner side of the limb external anchor frame 12, and the adjusting bolt 3 is screwed into the anchor block 9 of the external anchor frame until the head is exposed by 1-2mm, and 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 adjusting 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 machine 14, and the clamps of the tensile machine clamp the clamping plates 13 at both ends.

[0032] The tension cable 6 is tensioned, and the cross-shaped inner assembly frame 22 and the four-limb outer anchor frame 12 form a multi-stage anchoring system for the cable 6; the cable 6 is subjected to the tension T of the tensile machine 14, and the four pressure sensors 10 of the first cross-shaped inner assembly frame 221 at the bottom of the cable 6 monitor the pressures T11, T12, T13, and T14 respectively, and the sum of the pressures is T1, and 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 of 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 of 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 6 section between the third cross-shaped inner assembly frame 223 and the end anchor hole 7 is The tension of each level of anchoring section is adjusted by adjusting the screwing degree of the adjusting bolt 3 on the different cross-shaped inner assembly frames 22.

[0033] The present invention also provides a method for installing the assembled adjustable cable anchoring device, comprising the following steps: S1: Determine the number n of internal assembly racks to be set; S2: Pass the cable 6 through the inner anchor holes 8 of the n inner assembly frames, and the end of the cable 6 enters through the small hole of the inner anchor hole 8 and exits through the large hole; S3: adjacent inner assembly frames are arranged with controlled spacing, and 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 stand and solidify, waiting for the anchoring glue to reach 85% of the design strength; 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 head is exposed by 1-2mm, and place n inner assembly frames one by one on the corresponding anchor block 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; S5: insert the clip anchor 4 outside 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; S6: Put the cable anchoring device connected to the cable 6 into the tension machine 14, and the clamp of the tension machine 14 clamps the clamping plate 13; S7: applying 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; S8: Preliminary adjustment is made to 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 2 so that the forces on the outer ends of the inner assembly frame 2 are balanced; 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.

[0034] 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, which 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, all of which fall within the scope of protection of the present invention.

Claims

1. An assembled adjustable cable anchoring device, characterized in that: It comprises an outer anchoring frame, an inner assembly frame, adjusting bolts, clip anchors and anchoring glue; the outer anchoring frame is provided with end anchor holes and anchor blocks; the inner assembly frame is provided with inner anchor holes; the end anchor holes and inner anchor holes 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 by using clip anchors, and the cable is bonded to the inner assembly frame at the inner anchor hole by using anchoring glue; 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.

2. The assembled adjustable cable anchoring device according to claim 1 is characterized in that: 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. 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.

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 is an X-shaped inner assembly frame or a cross-shaped inner assembly frame. The outer end size of the inner assembly frame is 5-10mm 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. During installation, the inner assembly frame is placed on the anchor block of the outer anchor frame.

6. The assembled adjustable cable anchoring device according to claim 1 or 2, characterized in that: The inner assembly frame has slotted holes on both sides of the outer ends of the limbs, the center of the slotted holes 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, and the inner hole diameter is 1-2mm larger than the outer diameter of the adjusting bolt.

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

8. 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 on the opening side of the outer anchor frame and a large hole on the end anchor hole side. The diameter of the small hole is 2-3mm larger than the outer diameter of the cable.

9. 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.

10. The method for installing the assembled adjustable cable anchoring device according to claims 1 to 9, 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, and the cable end enters through the small hole of the inner anchor hole and exits through the large hole; S3: Control the spacing between adjacent internal assembly frames, pour anchor glue into the internal anchor hole, fill the gap between the internal anchor hole and the cable and let it stand to solidify, waiting for the anchor glue to reach 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 head is exposed by 1-2mm, and place n inner assembly frames one by one on the corresponding anchor blocks of the outer anchor frame, and insert the end of the adjusting bolt into the slot at the outer end of the inner assembly frame; S5: Slip 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: Put 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 anchor is initially anchored, and the n inner assembly frames are pressed tightly against the corresponding anchor blocks; S8: Preliminarily adjust 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 force on each outer extension end of the inner assembly frame is 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.

Images