Annular structure body prestressed tendon tensioning and monitoring integrated system and construction method thereof

Abstract

The invention relates to the field of building structure reinforcement, and discloses an annular structure body prestressed tendon tensioning and monitoring integrated system and a construction method thereof.The annular structure body prestressed tendon tensioning and monitoring integrated system comprises an annular structure body and a plurality of anchoring ribs fixedly connected to the outer wall of the annular structure body; the two ends of each annular prestressed tendon are anchored to the two adjacent anchoring ribs respectively, and the annular prestressed tendons are arranged around the outer wall of the annular structure body; the anchoring assemblies are arranged on the anchoring ribs and used for locking the circumferential prestressed tendons; and the reinforced concrete protection wall is poured on the outer wall of the annular structure body and the outer side of the circumferential prestressed tendons and used for wrapping and protecting the circumferential prestressed tendons. The prestressed tendons can form self-balancing anchoring and are suitable for large-diameter circular structures; the whole building adopts the prestressed tendons to simulate three-direction compression, the reinforcing effect can be greatly improved, and the actual prestress level in the structure using stage can be detected through a magnetic flux detector.

Description

Technical Field

[0001] This invention relates to the field of building structure reinforcement, specifically to an integrated system for monitoring the tensioning of prestressed tendons in a ring structure and its construction method. Background Technology

[0002] As existing reinforced concrete structures reach their service life limits, reinforcement methods are typically used to increase the load-bearing capacity and reduce the total life-cycle cost of public and civil buildings (especially tall structures) in order to extend their service life. External prestressing with tension has become a common reinforcement method due to its ease of construction, high efficiency, and low cost.

[0003] Existing anchoring systems are complex and cause secondary damage to the original structure. Traditional circumferential prestressed reinforcement methods typically require heavy and complex components (such as large anchor piers and buttresses) at the anchoring ends to resist the enormous prestressing tension. These anchoring components are not only complex to construct and expensive, but more importantly, they directly transfer huge concentrated forces to the old structure being reinforced, easily causing stress concentration around the anchoring point, resulting in secondary damage to the already aging original structure or leaving safety hazards. In other words, the anchoring force cannot be "self-balancing" and must be borne by the original structure. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an integrated system for monitoring the tensioning of prestressed tendons in ring structures and its construction method, which solves the problems of complex anchoring systems in existing technologies that are prone to causing secondary damage to the original structure.

[0005] To achieve the above objectives, the present invention provides the following technical solution: The first aspect of this invention provides an integrated system for monitoring the tensioning of prestressed tendons in a ring structure, comprising: A ring-shaped structure, and multiple anchoring ribs fixedly connected to the outer wall of the ring-shaped structure; Multiple circumferential prestressing tendons, each of which is anchored at both ends to two adjacent anchoring ribs and arranged around the outer wall of the annular structure. An anchoring assembly, disposed on the anchoring rib, is used to lock the circumferential prestressing tendon; A reinforced concrete retaining wall is poured on the outer wall of the annular structure and on the outside of the circumferential prestressing tendons to wrap and protect the circumferential prestressing tendons. An intelligent magnetic flux detector is installed near the circumferential prestressing tendon to detect the magnetic flux of the circumferential prestressing tendon.

[0006] A positioning tube and a sleeve are also provided on the side of the anchoring rib. The sleeve is installed on the outer wall of the annular structure, and the circumferential prestressing tendon passes through the inside of the positioning tube.

[0007] In one specific implementation, the anchoring rib is connected to the side of the annular structure by means of rebar installation.

[0008] In one specific embodiment, the anchoring rib is provided with a plurality of anchoring holes, and the anchoring assembly includes a conical anchor cup installed in the anchoring hole and a clamp that cooperates with the conical anchor cup to lock the circumferential prestressing tendon.

[0009] In one specific implementation, a spiral reinforcement is also provided inside the anchoring hole, which surrounds the conical anchor cup to enhance the local bearing capacity of the anchoring area.

[0010] In one specific embodiment, the intelligent magnetic flux detector includes a handle and measuring arms mounted on both sides of the handle. An induction coil is installed inside the handle, and an excitation coil is installed inside the measuring arms. A magnetic field is generated by the excitation coil, and the change in magnetic flux passing through the tension prestressed tendon is detected by the induction coil, thereby establishing a correspondence between physical quantities.

[0011] A second aspect of the present invention provides a construction method for the system described above, comprising the following steps: A. Install anchoring ribs: Install multiple anchoring ribs on the outer wall of the annular structure; B. Tensioning and anchoring the circumferential prestressing tendon: passing both ends of the circumferential prestressing tendon through the anchoring components on two adjacent anchoring ribs, tensioning the circumferential prestressing tendon, and locking it through the anchoring components; C. Casting the retaining wall: After all the circumferential prestressing tendons have been tensioned and locked, a reinforced concrete retaining wall is cast outside the circumferential prestressing tendons. D. Establish monitoring benchmark: Use an intelligent magnetic flux detector to detect the initial magnetic flux of the circumferential prestressing tendon after tensioning and locking, and establish a benchmark relationship between the initial magnetic flux and the tension force of the prestressing tendon for subsequent prestressing state monitoring.

[0012] As one specific implementation method, step A involves connecting the anchor ribs to the side of the annular structure by means of rebar installation.

[0013] In one specific implementation, before step B, a preparatory step is included: installing a tapered anchor cup and a spiral reinforcement in the anchor hole of the anchor rib, and installing a positioning tube and a sleeve on the side near the anchor rib.

[0014] As a specific implementation method, the tensioning and locking in step B are as follows: the tensioning device is used to apply tension to both ends of the circumferential prestressing tendon at the same time, and the clamping piece is pushed into the conical anchor cup. After the predetermined tension is reached, the tensioning device is released, so that the circumferential prestressing tendon retracts and drives the clamping piece to form a self-locking anchor in the conical anchor cup.

[0015] In one specific implementation, the method further includes periodically using the intelligent magnetic flux detector to detect the magnetic flux of the circumferential prestressing tendon, and calculating the real-time tension force of the prestressing tendon and the prestress level during the service stage based on the benchmark relationship established in step D, so as to evaluate the prestressing reinforcement effect.

[0016] This invention provides an integrated system for monitoring the tensioning of prestressed tendons in a ring-shaped structure and its construction method. It offers the following advantages: 1. This invention forms a closed force system on a horizontal plane by anchoring circumferential prestressing tendons to adjacent anchoring ribs. The anchoring force generated by the prestressing tendons achieves self-balancing within the system, avoiding the direct transmission of huge concentrated forces to the reinforced annular structure, thereby preventing stress concentration and secondary damage to the original structure in the anchoring zone.

[0017] 2. This invention applies circumferential prestress to the outside of the annular structure, placing the original structure under triaxial compression. This stress mode fully utilizes the excellent compressive strength of concrete, significantly improving the overall load-bearing capacity, shear resistance, and structural ductility of the structure, thereby enhancing reinforcement efficiency.

[0018] 3. This invention provides a non-destructive technique for quantitatively monitoring the internal stress of prestressed tendons during structural service by configuring an intelligent magnetic flux detector. By establishing a baseline relationship between magnetic flux and tension force, the real-time stress state of the prestressed tendons can be obtained non-contactly, and prestress loss can be accurately calculated. This enables precise assessment of the long-term effectiveness of the reinforcement system and monitoring of the structural safety status. Attached Figure Description

[0019] Figure 1 This is a top view of the integrated system of the present invention; Figure 2 This is a front view of the anchoring rib of the present invention; Figure 3 This is a layout diagram of the circumferential prestressed tendon anchorage and intelligent magnetic flux detector of the present invention. Figure 4 This is a left view of the anchoring rib of the present invention; Figure 5 This is a schematic diagram of the internal structure of the intelligent magnetic flux detector of the present invention.

[0020] The components include: 1. Ring structure; 2. Anchor rib; 3. Conical anchor cup; 4. Spiral reinforcement; 5. Wrapper; 6. Circumferential prestressed tendon; 7. Reinforced concrete retaining wall; 8. Intelligent magnetic flux detector; 9. Positioning tube; 10. Hoop; 11. Handle; 12. Induction coil; 13. Measuring arm; 14. Excitation coil; 15. First anchor hole; 16. Second anchor hole; 17. Third anchor hole; 18. Fourth anchor hole; 19. Fifth anchor hole; 20. Sixth anchor hole. Detailed Implementation

[0021] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples.

[0022] Example 1: Please see the appendix Figure 1 - Appendix Figure 5 This invention provides an integrated system for monitoring the tensioning of prestressed tendons in a ring-shaped structure. The system includes a ring-shaped structure 1 to be reinforced, such as a cylindrical silo or a circular water tank. Multiple anchoring ribs 2, distributed circumferentially, are fixedly connected to the outer wall of the ring-shaped structure 1. In this embodiment, the anchoring ribs 2 are connected to the side of the ring-shaped structure 1 by means of rebar installation to ensure sufficient connection strength and stiffness between the anchoring ribs 2 and the original structure 1.

[0023] The system also includes multiple circumferential prestressing tendons 6, such as high-strength steel strands or reinforcing bars. Each circumferential prestressing tendon 6 is anchored at both ends to two adjacent anchoring ribs 2, and its tendon body surrounds the outer wall of the annular structure 1. Through this arrangement, the tension of all the circumferential prestressing tendons 6 forms a closed, self-balancing force system on the horizontal plane.

[0024] To precisely control the path of the circumferential prestressing tendon 6 and maintain a predetermined distance from the outer wall of the annular structure 1, the system provides a positioning tube 9 on the side of the anchoring rib 2 and a sleeve 10 on the outer wall of the annular structure 1. During the circumferential process, the circumferential prestressing tendon 6 passes through the interior of the positioning tube 9, and its alignment and position are ensured by the positioning tube 9 and the sleeve 10 together.

[0025] To lock the circumferential prestressing tendon 6, each anchoring rib 2 is provided with an anchoring hole for installing an anchoring assembly. The anchoring assembly includes a conical anchor cup 3 installed in the anchoring hole and a clamping piece 5 for locking the circumferential prestressing tendon 6. When the circumferential prestressing tendon 6 is tensioned, the clamping piece 5 is pulled into the conical hole of the conical anchor cup 3 under the action of the prestressing tendon 6 retraction force, forming a wedge-shaped self-locking, thereby reliably anchoring the prestressing tendon 6 to the anchoring rib 2.

[0026] To further enhance the local bearing capacity and crack resistance of the anchorage zone, a spiral reinforcement 4 is also provided around the conical anchor cup 3 within the anchorage hole. This spiral reinforcement 4 can restrain the concrete in the anchorage zone, effectively dispersing and transmitting the huge concentrated force transmitted from the anchorage assembly.

[0027] After all the circumferential prestressing tendons 6 have been tensioned and anchored, the system also includes a reinforced concrete retaining wall 7. This retaining wall 7 is cast on the outer wall of the annular structure 1 and on the outside of all the circumferential prestressing tendons 6, enclosing the entire prestressed reinforcement system. Its function is twofold: firstly, to protect the internal circumferential prestressing tendons 6 from environmental erosion; and secondly, to enable the new and old structures to work together, further improving the overall stiffness and load-bearing capacity of the structure.

[0028] The system also includes an intelligent magnetic flux detector 8 for monitoring. This detector 8 is a standalone device, comprising a handle 11 and a pair of measuring arms 13 mounted on either side of the handle 11. The handle 11 houses an induction coil 12 for detecting changes in magnetic flux, while the measuring arms 13 house an excitation coil 14 for generating an excitation magnetic field. During testing, the operator holds the handle 11 and opens and closes the measuring arms 13 to encircle the exposed or later-grouted circumferential prestressing tendon 6 to be tested. Based on the magnetostrictive effect of ferromagnetic materials, the tensile stress level inside the prestressing tendon 6 affects its permeability, thereby altering its magnetic flux. By applying an initial magnetic field through the excitation coil 14, the induction coil 12 can detect the magnetic flux value passing through the prestressing tendon 6. This value has a definite physical correspondence with the tension and remaining prestress level of the prestressing tendon 6.

[0029] Example 2: Please see the appendix Figure 1 - Appendix Figure 5 This invention provides a construction method for an integrated system for monitoring the tensioning of prestressed tendons in a ring structure, comprising the following steps: Step 1: Install three equally spaced anchor ribs 2 on the side of the ring structure 1. Step 2: In the initial stage, the spiral reinforcement 4 and the conical anchor cup 3 are installed in the anchoring hole of the anchoring rib 2, and the positioning tube 9 and the sleeve 10 are installed on the side close to the anchoring rib 2. Step 3: Pass the circumferential prestressing tendon 6 through the first anchor hole 15 and the second anchor hole 16 (i.e., the anchor holes on the two adjacent anchor ribs 2), and tension both ends simultaneously. The front end of the tensioning device presses against the first anchor hole 15 and the second anchor hole 16. While tensioning, push the wedge 5 into the conical anchor cup 3. After tensioning to a certain load, release the circumferential prestressing tendon 6. During the retraction process, it drives the wedge 5 to form an anchor. Similarly, pass the circumferential prestressing tendon 6 through the third anchor hole 17 and the fourth anchor hole 18, the fifth anchor hole 19 and the sixth anchor hole 20 respectively to complete the tensioning. Step four: Following step two, complete the tensioning by passing the remaining anchor holes through the circumferential prestressing tendons 6 around the annular structure 1. After the tensioning of the circumferential prestressing tendons 6 outside the annular structure 1 is completed, pour a reinforced concrete retaining wall 7 outside the reinforcing bars (circumferential prestressing tendons 6) to wrap the circumferential prestressing tendons 6; Step 5: Use the intelligent magnetic flux detector 8 to detect the magnetic flux data of the prestressing tendon 6 at this time, and establish the relationship between magnetic flux and tension prestress. In the later stages, periodically test the prestressing magnetic flux and convert it into the tension force of the circumferential prestressing tendon 6 to determine the prestressing reinforcement effect.

Claims

1. An integrated system for monitoring the tensioning of prestressed tendons in a ring-shaped structure, characterized in that, include: A ring structure (1), and a plurality of anchoring ribs (2) fixedly connected to the outer wall of the ring structure (1). Multiple circumferential prestressing tendons (6), each of the two ends of the circumferential prestressing tendon (6) is anchored to two adjacent anchoring ribs (2) and is arranged around the outer wall of the annular structure (1); An anchoring assembly is provided on the anchoring rib (2) for locking the circumferential prestressing tendon (6). The reinforced concrete retaining wall (7) is poured on the outer wall of the annular structure (1) and the outside of the circumferential prestressed tendons (6) to wrap and protect the circumferential prestressed tendons (6). An intelligent magnetic flux detector (8) is set near the circumferential prestressing tendon (6) to detect the magnetic flux of the circumferential prestressing tendon (6); A positioning tube (9) and a sleeve (10) are also provided on the side of the anchoring rib (2). The sleeve (10) is installed on the outer wall of the annular structure (1), and the circumferential prestressing tendon (6) passes through the inside of the positioning tube (9).

2. The integrated system for monitoring the tensioning of prestressed tendons in a ring structure according to claim 1, characterized in that, The anchoring rib (2) is connected to the side of the annular structure (1) by means of rebar installation.

3. The integrated system for monitoring the tensioning of prestressed tendons in a ring structure according to claim 1, characterized in that, The anchoring rib (2) is provided with a plurality of anchoring holes, and the anchoring assembly includes a conical anchor cup (3) installed in the anchoring hole and a clamp (5) that cooperates with the conical anchor cup (3) to lock the circumferential prestressing tendon (6).

4. The integrated system for monitoring the tensioning of prestressed tendons in a ring structure according to claim 3, characterized in that, The anchoring hole is also provided with a spiral rib (4), which surrounds the conical anchor cup (3).

5. The integrated system for monitoring the tensioning of prestressed tendons in a ring structure according to claim 1, characterized in that, The intelligent magnetic flux detector (8) includes a handle (11) and measuring arms (13) installed on both sides of the handle (11). The handle (11) is provided with an induction coil (12), and the measuring arms (13) are provided with an excitation coil (14).

6. A construction method for the system as described in any one of claims 1 to 5, characterized in that, Includes the following steps: A. Install anchoring ribs (2): Install multiple anchoring ribs (2) on the outer wall of the annular structure (1); B. Tensioning and anchoring the circumferential prestressing tendon (6): Pass the two ends of the circumferential prestressing tendon (6) through the anchoring components on the two adjacent anchoring ribs (2), tension the circumferential prestressing tendon (6), and lock it through the anchoring components; C. Casting the retaining wall: After the tensioning and locking of all the circumferential prestressing tendons (6) is completed, a reinforced concrete retaining wall (7) is cast on the outside of the circumferential prestressing tendons (6). D. Establish monitoring benchmark: Use an intelligent magnetic flux detector (8) to detect the initial magnetic flux of the circumferential prestressed tendon (6) after tensioning and locking, and establish a benchmark relationship between the initial magnetic flux and the tension force of the prestressed tendon for subsequent prestress state monitoring.

7. The construction method according to claim 6, characterized in that, Step A specifically involves connecting the anchor ribs (2) to the side of the annular structure (1) by means of rebar installation.

8. The construction method according to claim 6, characterized in that, Before step B, a tapered anchor cup (3) and a spiral bar (4) are installed in the anchor hole of the anchor rib (2), and a positioning tube (9) and a sleeve (10) are installed on the side near the anchor rib (2).

9. The construction method according to claim 6, characterized in that, The tensioning and locking in step B are as follows: the tensioning device is used to apply tension to both ends of the circumferential prestressed tendon (6) at the same time, and the clamping piece (5) is pushed into the conical anchor cup (3). After the predetermined tension is reached, the tensioning device is released, so that the circumferential prestressed tendon (6) retracts and drives the clamping piece (5) to form a self-locking anchor in the conical anchor cup (3).

10. The construction method according to claim 6, characterized in that, It also includes periodically using the intelligent magnetic flux detector (8) to detect the magnetic flux of the circumferential prestressed tendon (6), and calculating the real-time tension and prestress level of the prestressed tendon based on the reference relationship, so as to evaluate the prestressing reinforcement effect.

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