Anchor cable tensioning construction method

Abstract

The invention discloses an anchor cable tensioning construction method. The anchor cable tensioning construction method comprises the following steps: S1, measuring a release point; s2, pore forming; s3, manufacturing and mounting an anchor cable; s4, grouting the anchoring section; s5, anchorage pier head construction and anchorage device installation; s6, anchor cable tensioning and cloud monitoring are carried out; s7, free section grouting; s8, sealing the anchor; according to the method, the technical requirements of all links are clarified by standardizing the construction process, accurate control and real-time monitoring of the whole anchor cable tensioning construction process are achieved with the help of an intelligent monitoring means, the quality problem easily occurring in traditional construction can be effectively avoided, the construction quality and safety are improved, and the engineering risk is reduced; reworking and adjustment in the construction process can be reduced, and the construction efficiency is improved; and meanwhile, later maintenance and repair work is reduced, the engineering full-life-cycle cost is reduced, the construction cost is saved, and important practical significance is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of anchor cable construction, and more particularly to an anchor cable tensioning construction method. Background Art

[0002] In slope support and cavern reinforcement projects in the fields of water conservancy, hydropower, transportation, mining, etc., anchor cable tensioning construction is a key process to ensure the stability of the project structure, and its construction quality is crucial to the long-term stability of the project.

[0003] In the traditional anchor cable tensioning construction process, the construction process lacks systematic specifications, and the quality control of each link is not precise enough, which makes it difficult to ensure the construction quality and safety. Problems such as substandard anchor cable quality, loose grouting, and inaccurate tensioning force control are prone to occur, affecting the anchoring effect of the anchor cable and the stability of the engineering structure. The traditional anchor cable tensioning construction method lacks effective monitoring means, making it difficult to detect potential problems in the construction process in a timely manner, increasing the project risk level and subsequent maintenance costs.

[0004] Therefore, it is necessary to provide an anchor cable tensioning construction method to solve the above technical problems. Summary of the Invention

[0005] The purpose of the present invention is to provide an anchor cable tensioning construction method to solve the above technical problems.

[0006] To achieve the above object, the present invention adopts the following technical solutions: An anchor cable tensioning construction method comprises the following steps: S1. Measure the placement point Use a total station to locate the anchor holes according to the design drawings; S2, hole making Select the drill bit and drilling parameters, drill the hole with the drilling rig, use the inclinometer to measure the inclination and correct the deviation during drilling, and stop drilling when the standard is met; S3. Anchor cable production and installation Cut the steel strands as required, set up centering brackets and isolation frames, and tie them together. Use lifting equipment to lift the anchor cables into the holes. Once the cables reach the anchor hole, use anchors to temporarily secure them. S4. Grouting of anchoring section First, place a grouting bag between the anchor section and the free section, and inject the grout into the borehole through the grouting pipe; S5. Anchor head construction and anchor installation Set up the anchor pier head formwork, pour concrete, vibrate, and perform curing, then install the steel anchor pad and anchor on the anchor pier head; S6, tensioned anchor cables and cloud monitoring After the concrete strength of the anchor pier head reaches the specified value, the tensioning machine will first pre-tension the anchor cables individually, and then tension the entire cable in a graded tensioning sequence. The tensioning force and elongation will be monitored in real time on the cloud. Once the designed tensioning force is reached, the load will be held for 10 minutes and the anchor will be locked. S7, free section grouting After tensioning and locking is completed, grouting is performed on the free section of the anchor cable according to the grouting method in S4; S8, Anchor Use a grinding wheel cutter to cut the exposed part of the anchor cable. The cutting position should be no less than 30mm away from the outer edge of the anchor. Use waterproof mortar to seal the anchor head. The sealing thickness should be no less than 50mm.

[0007] Furthermore, in S2, the effective hole depth of the final hole is greater than the design depth but does not exceed 40 cm, the hole opening deviation is not greater than 10 cm, the hole axis deviation of the final hole is not greater than 2% of the hole depth, and the entrance inclination and azimuth deviation are not greater than 3°.

[0008] Furthermore, in said S2, the following steps are also included: S21, high-pressure air cleaning hole Use high-pressure air to blow away debris in the hole for at least 10 minutes, and use a camera inside the hole to check the cleanliness; S22, In-hole imaging and quality inspection Use in-hole video equipment to check the hole depth and diameter and compare them with the design requirements, and record and handle quality issues in a timely manner.

[0009] Furthermore, in said S3, the anchor cable is a 1x7 steel strand with a tensile strength of not less than 1860 MPa, a nominal diameter of 15.20 mm, and a nominal area of ​​140 , weight per meter is 1101g / m, maximum force of steel strand is 260KN, and elongation value is not less than 3.5%.

[0010] Furthermore, in the S3, the anchor model is YJM-15, a centering bracket and an isolation frame are set every 1.0m in the anchoring section, and a centering bracket and an isolation frame are set every 1.5m in the tensioning section, and the center bracket and the isolation frame are tied together with lead wire.

[0011] Furthermore, in said S6, the tensioning equipment includes a 25t jack and a 150t jack, and the 25t jack pre-tightens the single anchor cable according to 10%-20% of the designed tensioning force; After pre-tightening is completed, the overall tensioning is carried out using a 150t jack, and the tensioning is carried out in stages according to the designed sequence.

[0012] Furthermore, the graded tensioning sequence of the tensioning equipment is 20%P, 25%P, 50%P, 75%P, 100%P, 105-110%P, where P is the designed tensioning force, each level is held for 2-5 minutes, and the last level is held for 30 minutes; the loading rate does not exceed P / 10 per minute, and the unloading rate does not exceed P / 5 per minute.

[0013] Furthermore, the tensioning equipment uses a jack of model YCW250T-200 with a displacement meter, with a nominal tensioning force of 2495KN, a tensioning stroke of 200mm, a through-hole diameter of 140mm, a rated oil pressure of 54MPa, a return oil pressure of less than 25MPa, a displacement range of 200mm, and a displacement accuracy of 0.1mm.

[0014] Furthermore, in S6, the specific steps of cloud monitoring include: S61. Server deployment and account allocation: The central cloud server deploys the anchor cable tensioning cloud monitoring system and allocates accounts to designated personnel; S62, wireless connection: start the wireless device to achieve the connection between the site and the central cloud server; S63, parameter setting: On-site personnel complete the setting of anchor hole parameters for the construction site according to the design parameters, and start the anchor cable tensioning after the setting is completed; S64, data upload: The tension force and elongation of the anchor cable are uploaded to the central cloud server in real time and recorded; S65, Data Viewing: During the construction process, personnel can remotely view the real-time data of anchor cable tensioning through mobile phones or PCs to grasp the dynamics of the project; S66. Report generation and storage: When the on-site anchor cable tensioning reaches the design requirements, the on-site anchor cable tensioning is completed and the report is generated and stored.

[0015] Furthermore, in said S4, the grouting pressure is controlled between 0.1 MPa and 0.3 MPa, and after reaching the standard, the screen grouting pressure is between 0.3 MPa and 0.4 MPa, and the screen grouting time is 20-30 minutes.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. Improved construction quality: By standardizing the construction process and clarifying the technical requirements of each link, combined with precise equipment selection and parameter control, we ensure that each construction step is strictly carried out in accordance with the standards, effectively avoiding quality problems that are prone to occur in traditional construction, such as drilling deviation, loose grouting, inaccurate tensioning force, etc., and improving the overall quality of anchor cable tensioning construction; 2. Enhanced safety performance: The application of intelligent monitoring methods enables construction personnel to obtain key data during the construction process in real time, promptly identify potential safety hazards such as abnormal anchor cable stress and unstable hole wall, and take appropriate measures to deal with them, effectively reducing the probability of engineering accidents and ensuring the safety of construction personnel and the safety of engineering structures; 3. Improved construction efficiency: Standardized construction processes and clear technical requirements reduce rework and adjustments during construction, improving construction efficiency. At the same time, the use of intelligent monitoring equipment enables rapid data collection and analysis, providing construction personnel with timely decision-making basis and further shortening the construction period. 4. Reduce project costs: Due to improved construction quality, enhanced safety performance and improved construction efficiency, subsequent maintenance and repair work is reduced, reducing the full life cycle cost of the project; at the same time, it avoids project rework and delays caused by construction quality issues, saving construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a construction flow chart of an embodiment of the present invention; Figure 2 This is a construction flow chart after drilling according to an embodiment of the present invention; Figure 3 This is a flowchart of cloud monitoring steps according to an embodiment of the present invention. DETAILED DESCRIPTION

[0018] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] See also Figure 1-3 , an anchor cable tensioning construction method, comprising the following steps: Construction preparation: complete drawing review and graded technical briefing, prepare construction plan, and clarify technical parameters of each link; Conduct slurry mix ratio tests to determine the optimal mix ratios for M30 / M40 slurry (water-cement ratio 0.37-0.45), M40 mortar (cement: sand: water = 1:1.36:0.37), and C35 / C40 anchor pier concrete, adding 5% accelerator (added 1-2 minutes before grouting) and 1% water reducer. S1. Measure the placement point Use a total station to locate the anchor holes according to the design drawings, and control the hole position deviation to no more than 10 cm. During the measurement process, the measurement error must be strictly controlled to ensure the accuracy of the anchor hole position. After the placement is completed, mark and record it for subsequent construction; S2, hole making Select the drill bit and drilling parameters, drill the hole with the drilling rig, use the inclinometer to measure the inclination and correct the deviation during drilling, and stop drilling when the standard is met; Transport the drilling rig to the location determined by the surveying and placement points. Use a lifting device to smoothly hoist the drilling rig into place, aligning the center of the drilling rig with the center of the anchor hole. After selecting the appropriate drill bit and drilling parameters, start the drilling rig and drill slowly. During the drilling process, closely observe the operation of the drilling rig and the slag discharge of the borehole, and adjust the drilling parameters in a timely manner. After drilling to a certain depth, use an inclinometer or other instrument to measure the deviation of the borehole. If the deviation exceeds the allowable range, take corrective measures in a timely manner. Stop drilling when the hole reaches the designed depth. S3. Anchor cable production and installation Cut the steel strands as required, set up centering brackets and isolation frames, and tie them together. Use lifting equipment to lift the anchor cables into the holes. Once the cables reach the anchor hole, use anchors to temporarily secure them. During the cutting process, care should be taken to protect the ends of the steel strands to avoid burrs and damage. Special anchor cable weaving equipment should be used to weave the steel strands into anchor cables. During the weaving process, centering brackets and isolation brackets should be set according to the design requirements, and the brackets and steel strands should be tied firmly with lead wire to ensure that the structure and size of the anchor cables meet the design standards. During the installation process, a dedicated person should be arranged to direct and guide the anchor cables at the hole mouth to ensure that the anchor cables can enter the drill hole smoothly and avoid collision and friction between the anchor cables and the hole wall. When the anchor cables reach the designed position, they should be temporarily fixed at the hole mouth with anchors. S4. Grouting of anchoring section First, place a grouting bag between the anchor section and the free section, and then use a grouting pump to inject the slurry into the borehole through the grouting pipe. The grouting bag is made of geotextile or fine canvas, with a compressive strength of not less than 0.5MPa and a length of 0.8-1m. Prepare cement mortar or pure cement slurry according to the design requirements, start the grouting pump and inject the slurry into the borehole through the grouting pipe. During the grouting process, closely observe the reading of the orifice pressure gauge; S5. Anchor head construction and anchor installation Set up the anchor pier head formwork, pour concrete and vibrate, and carry out curing for no less than 7 days. Then install the steel anchor plate and anchor on the anchor pier head to ensure alignment. The anchor plate should be made of high-quality carbon steel with a size of 300mm×300mm×40mm. Make the anchor pier head formwork according to the design requirements. The formwork should have sufficient strength and rigidity, and the surface should be flat and smooth. Apply a release agent on the inside of the formwork so that it can be removed smoothly when the formwork is removed. Prepare the concrete according to the designed mix ratio, pour the prepared concrete into the formwork, and use a vibrating rod to vibrate it to ensure that the concrete is vibrated and dense. During the concrete pouring process, the formwork should be observed at all times. If deformation or leakage of the formwork is found, timely measures should be taken to deal with it. After the concrete pouring is completed, the surface should be smoothed and covered with plastic film for maintenance; S6, tensioned anchor cables and cloud monitoring After the concrete strength of the anchor pier head reaches the specified value, the tensioning machine will first pre-tension the anchor cables individually, and then tension the entire cable in a graded tensioning sequence. The tensioning force and elongation will be monitored in real time on the cloud. Once the designed tensioning force is reached, the load will be held for 10 minutes and the anchor will be locked. After the concrete strength of the anchor pier head reaches the design requirements, the anchor cable is tensioned. The tensioning equipment is installed on the anchor cable, and the ZB4-500 electric oil pump and shockproof pressure gauge are connected. The anchor cable is pre-tightened first, and the pre-tightening force is controlled at 10%~20% of the design requirements. After the pre-tightening is completed, the anchor cable is tensioned as a whole, and tensioning is carried out according to the tensioning sequence and tensioning force classification required by the design. During the tensioning process, the reading of the shockproof pressure gauge and the elongation of the anchor cable should be closely observed. If any abnormality is found, the tensioning should be stopped immediately, the cause should be identified and appropriate measures should be taken to deal with it.

[0020] S7, free section grouting After tensioning and locking is completed, grouting is performed on the free section of the anchor cable according to the grouting method in S4; After the tensioning anchor cable is locked, the free section of the anchor cable is grouted. The grouting method and process are the same as those of the anchoring section to ensure that the free section is grouted densely. S8, Anchor Use a grinding wheel cutter to cut the exposed part of the anchor cable. The cutting position should be no less than 30mm away from the outer edge of the anchor. Use waterproof mortar to seal the anchor head with a sealing thickness of no less than 50mm to ensure that the anchor head is not corroded by the external environment.

[0021] Furthermore, in S2, the effective hole depth of the final hole is greater than the design depth but does not exceed 40 cm, the hole opening deviation is not greater than 10 cm, the hole axis deviation of the final hole is not greater than 2% of the hole depth, and the entrance inclination and azimuth deviation are not greater than 3°.

[0022] Furthermore, in said S2, the following steps are also included: S21, high-pressure air cleaning hole Use high-pressure air to blow away debris in the hole for at least 10 minutes, and use a camera inside the hole to check the cleanliness; Insert the high-pressure air pipe into the drilled hole, turn on the air compressor, and use high-pressure air to blow the hole. During the blowing process, the air pipe should be moved continuously to ensure that all parts of the hole can be fully cleaned. The hole cleaning time is determined according to the hole depth and the amount of debris in the hole. Generally, it should be no less than 10 minutes. After the hole cleaning is completed, use the hole camera to check the hole cleaning condition. If there is still debris in the hole, continue to clean the hole until the hole is clean. S22, In-hole imaging and quality inspection Use in-hole video equipment to check the hole depth and diameter and compare them with the design requirements, and record and handle quality issues in a timely manner.

[0023] Slowly lower the in-hole camera into the borehole and observe the hole wall through the camera's display screen. Check whether the hole wall is intact and whether there are any problems such as hole collapse and diameter shrinkage. At the same time, measure parameters such as the depth and diameter of the drilled hole and compare them with the design requirements. If any quality problems are found, record them in time and take appropriate measures, such as re-drilling or hole expansion.

[0024] Furthermore, in said S3, the anchor cable is a 1x7 steel strand with a tensile strength of not less than 1860 MPa, a nominal diameter of 15.20 mm, and a nominal area of ​​140 The theoretical weight per meter is 1101g / m, the maximum force of the steel strand is 260KN, and the elongation value is not less than 3.5%.

[0025] Furthermore, in the S3, the anchor model is YJM-15, a centering bracket and an isolation frame are set every 1.0m in the anchoring section, and a centering bracket and an isolation frame are set every 1.5m in the tensioning section, and the center bracket and the isolation frame are tied together with lead wire.

[0026] Furthermore, in said S6, the tensioning equipment includes a 25t jack and a 150t jack, and the 25t jack pre-tightens the single anchor cable according to 10%-20% of the designed tensioning force; After pre-tightening is completed, the overall tensioning is carried out using a 150t jack, and the tensioning is carried out in stages according to the designed sequence.

[0027] Furthermore, the graded tensioning sequence of the tensioning equipment is 20%P, 25%P, 50%P, 75%P, 100%P, 105-110%P, where P is the designed tensioning force, each level is held for 2-5 minutes, and the last level is held for 30 minutes; the loading rate does not exceed P / 10 per minute, and the unloading rate does not exceed P / 5 per minute.

[0028] Furthermore, the tensioning equipment uses a jack of model YCW250T-200 with a displacement meter, with a nominal tensioning force of 2495KN, a tensioning stroke of 200mm, a through-hole diameter of 140mm, a rated oil pressure of 54MPa, a return oil pressure of less than 25MPa, a displacement range of 200mm, and a displacement accuracy of 0.1mm.

[0029] During tensioning, an EITCV1.0 anchor cable tensioning recorder is used to monitor oil pressure, tensioning force, and displacement. The tensioning force accuracy is 1%, and the displacement measurement accuracy is 0.5%. The displacement sensor has a measurement range of 0-220mm and a pressure measurement accuracy of 0.5%. The displacement sensor cable is a 3-core dual-female aviation plug signal cable with a length of 25m. The model of the digital oil pressure gauge used is: OHR-K2G-2-LB, which needs to be calibrated with the jack provided by the construction unit before construction; the measuring range is 0-60MPa, the power supply is DC24V, the accuracy is 0.5 level, and the protection level is IP65.

[0030] Through the anchor cable tensioning recorder, digital oil pressure gauge, etc., accurate control and real-time monitoring of the entire anchor cable tensioning construction process can be achieved.

[0031] Furthermore, in S6, the specific steps of cloud monitoring include: S61. Server deployment and account allocation: The central cloud server deploys the anchor cable tensioning cloud monitoring system and allocates accounts to designated personnel; S62, wireless connection: start the wireless device to achieve the connection between the site and the central cloud server; S63, parameter setting: On-site personnel complete the setting of anchor hole parameters for the construction site according to the design parameters, and start the anchor cable tensioning after the setting is completed; S64, data upload: The tension force and elongation of the anchor cable are uploaded to the central cloud server in real time and recorded; S65, Data Viewing: During the construction process, personnel can remotely view the real-time data of anchor cable tensioning through mobile phones or PCs to grasp the dynamics of the project. The personnel may include rear experts, owners, supervisors, and on-site construction personnel. The mobile phone supports real-time data browsing, and the PC supports real-time data viewing, historical report query and report printing; S66. Report generation and storage: When the on-site anchor cable tensioning meets the design requirements, the on-site anchor cable tensioning is terminated and a storage report is generated. When the on-site construction personnel finish recording, the central cloud server automatically generates an anchor cable tensioning report and stores it centrally on the server. Users can view the anchor cable tensioning report data (including historical reports and reports in progress) on their mobile phones or PCs, and can print the anchor cable tensioning report at any time on the PC.

[0032] Furthermore, in said S4, the grouting pressure is controlled between 0.1 MPa and 0.3 MPa, and after reaching the standard, the screen grouting pressure is between 0.3 MPa and 0.4 MPa, and the screen grouting time is 20-30 minutes.

[0033] The construction method of this application covers multiple steps, including surveying and placing points, hole making, anchor cable production and installation, anchor section grouting, anchor pier head construction and anchor installation, anchor cable tensioning and cloud monitoring, free end grouting, and anchor sealing. It clarifies the technical requirements of each link and uses intelligent monitoring methods such as anchor cable tensioning recorders and digital oil pressure gauges to achieve precise control and real-time monitoring of the entire anchor cable tensioning construction process. This method can effectively avoid quality problems that are common in traditional construction, improve construction quality and safety, and reduce project risks. It can also reduce rework and adjustments during construction, improving construction efficiency. At the same time, it reduces post-maintenance and repair work, reduces the cost of the entire project life cycle, and saves construction costs, which is of great practical significance.

[0034] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.

Claims

1. An anchor cable tensioning construction method, characterized in that: The steps include: S1. Measure the placement point Use a total station to locate the anchor holes according to the design drawings; S2, hole making Select the drill bit and drilling parameters, drill the hole with the drilling rig, use the inclinometer to measure the inclination and correct the deviation during drilling, and stop drilling when the standard is met; S3. Anchor cable production and installation Cut the steel strands as required, set up centering brackets and isolation frames, and tie them together. Use lifting equipment to lift the anchor cables into the holes. Once the cables reach the anchor hole, use anchors to temporarily secure them. S4. Grouting of anchoring section First, place a grouting bag between the anchor section and the free section, and inject the grout into the borehole through the grouting pipe; S5. Anchor head construction and anchor installation Set up the anchor pier head formwork, pour concrete, vibrate, and perform curing, then install the steel anchor pad and anchor on the anchor pier head; S6, tensioned anchor cables and cloud monitoring After the concrete strength of the anchor pier head reaches the specified value, the tensioning machine will first pre-tension the anchor cables individually, and then tension the entire cable in a graded tensioning sequence. The tensioning force and elongation will be monitored in real time on the cloud. Once the designed tensioning force is reached, the load will be held for 10 minutes and the anchor will be locked. S7, free section grouting After tensioning and locking is completed, grouting is performed on the free section of the anchor cable according to the grouting method in S4; S8, Anchor Use a grinding wheel cutter to cut the exposed part of the anchor cable. The cutting position should be no less than 30mm away from the outer edge of the anchor. Use waterproof mortar to seal the anchor head. The sealing thickness should be no less than 50mm.

2. An anchor cable tensioning construction method according to claim 1, characterized in that: In said S2, the effective hole depth of the final hole is greater than the designed depth but does not exceed 40 cm, the hole opening deviation is not greater than 10 cm, the hole axis deviation of the final hole is not greater than 2% of the hole depth, and the entrance inclination and azimuth deviation are not greater than 3°.

3. An anchor cable tensioning construction method according to claim 2, characterized in that: In said S2, the following steps are also included: S21, high-pressure air cleaning hole Use high-pressure air to blow away debris in the hole for at least 10 minutes, and use a camera inside the hole to check the cleanliness; S22, In-hole imaging and quality inspection Use in-hole video equipment to check the hole depth and diameter and compare them with the design requirements, and record and handle quality issues in a timely manner.

4. An anchor cable tensioning construction method according to claim 1, characterized in that: In the S3, the anchor cable is 1x7 steel strand with a tensile strength of not less than 1860 MPa, a nominal diameter of 15.20 mm, and a nominal area of ​​140 , weight per meter is 1101g / m, maximum force of steel strand is 260KN, and elongation value is not less than 3.5%.

5. The anchor cable tensioning construction method according to claim 1, characterized in that: In the S3, the anchor model is YJM-15, a centering bracket and an isolation frame are set every 1.0m in the anchoring section, and a centering bracket and an isolation frame are set every 1.5m in the tensioning section. The center bracket and the isolation frame are tied together with wire.

6. An anchor cable tensioning construction method according to claim 1, characterized in that: In said S6, the tensioning equipment includes a 25t jack and a 150t jack, and the 25t jack pre-tightens the single anchor cable according to 10%-20% of the designed tensioning force; After pre-tightening is completed, the overall tensioning is carried out using a 150t jack, and the tensioning is carried out in stages according to the designed sequence.

7. An anchor cable tensioning construction method according to claim 6, characterized in that: The graded tensioning sequence of the tensioning equipment is 20% P, 25% P, 50% P, 75% P, 100% P, 105-110% P, where P is the designed tensioning force, each level is held for 2-5 minutes, and the last level is held for 30 minutes; the loading rate does not exceed P / 10 per minute, and the unloading rate does not exceed P / 5 per minute.

8. An anchor cable tensioning construction method according to claim 6, characterized in that: The tensioning equipment uses a jack of model YCW250T-200 with a displacement meter. Its nominal tensioning force is 2495KN, the tensioning stroke is 200mm, the through-hole diameter is 140mm, the rated oil pressure is 54MPa, the return oil pressure is less than 25MPa, the displacement range is 200mm, and the displacement accuracy is 0.1mm.

9. An anchor cable tensioning construction method according to claim 1, characterized in that: In S6, the specific steps of cloud monitoring include: S61. Server deployment and account allocation: The central cloud server deploys the anchor cable tensioning cloud monitoring system and allocates accounts to designated personnel; S62, wireless connection: start the wireless device to achieve the connection between the site and the central cloud server; S63, parameter setting: On-site personnel complete the setting of anchor hole parameters for the construction site according to the design parameters, and start the anchor cable tensioning after the setting is completed; S64, data upload: The tension force and elongation of the anchor cable are uploaded to the central cloud server in real time and recorded; S65, Data Viewing: During the construction process, personnel can remotely view the real-time data of anchor cable tensioning through mobile phones or PCs to grasp the dynamics of the project; S66. Report generation and storage: When the on-site anchor cable tensioning reaches the design requirements, the on-site anchor cable tensioning is completed and the report is generated and stored.

10. An anchor cable tensioning construction method according to claim 1, characterized in that: In said S4, the grouting pressure is controlled between 0.1 MPa and 0.3 MPa. After reaching the standard, the screen grouting pressure is between 0.3 MPa and 0.4 MPa, and the screen grouting time is 20 to 30 minutes.

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