Prestressed intelligent steel strand of containment vessel and construction method of prestressed system

Abstract

The present application relates to prestress monitoring technology field of nuclear power plant containment, disclose a kind of prestress intelligent steel strand of containment and the construction method of prestress system, including intelligent sensing muscle, multiple edge silk and traction middle silk;Intelligent sensing muscle is used for the monitoring of prestress value;Multiple edge silk is arranged as annular structure around the outer periphery of intelligent sensing muscle, annular structure includes sensing section and traction section, both ends of intelligent sensing muscle are set out of sensing section;Traction section has one end working position fixedly connected in sensing section, and separate position separated from sensing section;When traction section is in working position, the part of intelligent sensing muscle protruding from sensing section is located in traction section;Traction middle silk is arranged on the same axis with intelligent sensing muscle, fixedly connected in traction section, one end is spaced apart from intelligent sensing muscle, the other end protrudes from traction section, the present application can avoid damage to intelligent sensing muscle by setting traction section when carrying out the threading operation of intelligent steel strand.

Description

Technical Field

[0001] This invention relates to the field of prestress monitoring technology for nuclear power plant containment structures, specifically to a prestressed intelligent steel strand for containment structures and a construction method for the prestressing system. Background Technology

[0002] As a crucial component of nuclear power plants, the containment structure is one of the most important structures. The prestressed concrete containment, as a vital part of the nuclear power plant, is one of the most critical structures and serves as the third line of defense against radioactive contamination of the environment. It is essential for maintaining normal unit operation and ensuring personnel safety. The containment prestressing system plays a crucial role in the containment's sealing performance and load-bearing capacity under containment accident conditions. The containment prestressing system generally includes circumferential and vertical prestressed steel strands. These prestressed steel strands are characterized by their large length, large reverse friction angle, and numerous embedded parts at equipment openings, resulting in complex stress distribution. To ensure the long-term, stable, safe, and effective operation of the containment prestressing system, long-term and effective monitoring of the prestress values ​​is extremely important.

[0003] Among related technologies, there is a post-tensioned prestressed intelligent reinforcement system based on fiber optic grating sensing technology. This system organically combines fiber optic grating intelligent steel strands with post-tensioned prestressing technology and applies it to an external prestressed reinforcement system. This allows the system to meet the required strength, stability, and durability for reinforcement while also possessing sensing characteristics, thus forming an intelligent reinforcement system. However, in this structure, the intelligent sensing ribs of the intelligent steel strands have multiple edge wires protruding from both ends. During the installation of the intelligent steel strands, the intelligent sensing ribs are easily damaged, resulting in waste of the intelligent sensing ribs and increased construction costs. Summary of the Invention

[0004] In view of this, the present invention provides a method for constructing a prestressed intelligent steel strand and a prestressing system for a containment structure, in order to solve the problem that the intelligent sensing tendons are easily damaged during the installation of the intelligent steel strands, resulting in waste of the intelligent sensing tendons and increased construction costs.

[0005] In a first aspect, the present application provides a prestressed intelligent steel strand for a containment vessel, comprising an intelligent sensing tendon, a plurality of edge wires, and a traction center wire; the intelligent sensing tendon is used for monitoring the prestress value; the plurality of edge wires are arranged in a ring structure around the outer periphery of the intelligent sensing tendon, the ring structure comprises a sensing segment and a traction segment, both ends of the intelligent sensing tendon protrude from the sensing segment; the traction segment has a working position fixedly connected to one end of the sensing segment, and a separation position separated from the sensing segment; when the traction segment is in the working position, the part of the intelligent sensing tendon protruding from the sensing segment is located in the traction segment; the traction center wire is arranged on the same axis as the intelligent sensing tendon, is fixedly connected in the traction segment, is spaced apart from the intelligent sensing tendon at one end, and protrudes from the traction segment at the other end.

[0006] Beneficial effects: when the traction segment is in the working position, by setting the traction segment and the traction center wire as the insertion end of the prestressed intelligent steel strand for the containment vessel in the prestressed duct, and the tensioning operation end outside the containment vessel structure, the wear or strain of the intelligent sensing tendon can be reduced, the intelligent sensing tendon is effectively protected, and the construction cost is reduced; after traction is completed, the traction segment can be cut to make the traction segment in the separation position, so that both ends of the intelligent sensing tendon can protrude from both ends of the sensing segment. After the construction of the prestressed intelligent steel strand for the containment vessel is completed, one end of the traction segment is exposed on the surface of the containment vessel structure. In order to avoid the length of the prestressed intelligent steel strand for the containment vessel exposed on the surface of the containment vessel structure being too long, which will adversely affect the strength and ductility of the concrete in the containment vessel, part of the prestressed intelligent steel strand for the containment vessel exposed outside needs to be cut off. By setting the separation position of the traction segment, the intelligent sensing tendon can be avoided from being cut off, and the construction cost is further saved.

[0007] In an optional embodiment, a sealing anchor structure is further included, the sealing anchor structure comprises a sealing anchor cover, a connecting assembly, and a sealing assembly; the sealing anchor cover is provided with a first through hole and is adapted to be arranged at the end of the prestressed duct and fixedly connected to the surface of the containment vessel structure; the connecting assembly is detachably connected at the first through hole and is provided with a second through hole in the axial direction; the sealing assembly is connected with the connecting assembly and is provided with a third through hole in the axial direction; the third through hole communicates with the second through hole; the end of the intelligent sensing tendon passes through the second through hole and the third through hole in sequence and is in sealing fit with the third through hole.

[0008] Beneficial effects: By setting the second and third through holes in the sealing anchor structure, the intelligent sensing rib can be passed through the sealing anchor structure and connected to external devices for signal transmission; by setting the sealing component, the sealing anchor structure can be sealed, playing a role in rust prevention, corrosion prevention, and pollution prevention; by setting the first through hole and the connecting component, the sealing component can be effectively fixedly connected to the sealing anchor cover.

[0009] In one optional embodiment, the sealing assembly includes a sealing head and a sealing cap; the sealing head is engaged in the second through hole and has a first through hole in the axial direction; the sealing cap is disposed on the connecting assembly and has a second through hole, the second through hole communicating with the first through hole to form the third through hole.

[0010] Beneficial effects: By setting the sealing head, the intelligent sensing rib can be passed through the sealing anchor structure, and the sealing anchor structure can also be blocked; by setting the sealing cover, the sealing head can be connected and fixed on the connecting component.

[0011] In one alternative implementation, the two ends of the connecting assembly are threadedly connected to the anchor cap and the plug cap, respectively.

[0012] Beneficial effects: By connecting the two ends of the connecting component to the anchor cap and the plug cap respectively by thread, it is convenient to connect and disassemble the connecting component, the anchor cap and the plug cap. It is also convenient to adjust the opening position of the first through hole according to the location of the smart sensor rib, ensuring that the first through hole and the smart sensor rib are on the same axis, improving the connection accuracy between the smart sensor rib and the anchor structure, and preventing the smart sensor rib from bending and being damaged.

[0013] In one optional embodiment, the outer periphery of the sealing anchor cover is provided with a plurality of first connectors, the plurality of first connectors being spaced apart along the outer periphery of the sealing anchor cover, and all being fixedly connected to the surface of the containment structure.

[0014] Beneficial effects: By setting up multiple first connectors, the anchor cover can be tightly fixed to the surface of the containment structure, so that the anchor cover and the containment structure maintain the correct positional relationship and form a stable integral structure.

[0015] In an alternative embodiment, a protective sleeve is also included, which is fitted over the end of the sensing section away from the traction section.

[0016] Beneficial effects: By setting up the protective sleeve, the end of the sensing section that is far from the traction section can be protected, preventing the end of the sensing section that is far from the traction section from being damaged by external friction.

[0017] In an alternative embodiment, an extrusion anchor is further included, which is located at the position of the traction section, and the plurality of side wires are fixedly connected with the traction middle wire through the extrusion anchor.

[0018] Beneficial effects: the reliable friction connection between the side wire and the traction middle wire and the extrusion anchor is formed by the setting of the extrusion anchor, the close connection between the side wire and the traction middle wire of the traction section is achieved, the relative slipping between the side wire and the traction middle wire is avoided in the use process of the traction section, and the reliability of the prestressed intelligent steel strand is improved.

[0019] In an alternative embodiment, a first optical fiber jumper head is further included, which is located at one end of the intelligent sensing tendon away from the traction section and is connected with the intelligent sensing tendon, and is used for the output of the data signal.

[0020] Beneficial effects: the real-time collection of the prestress value of the prestressed intelligent steel strand in the tensioning process is achieved by setting the first optical fiber jumper head at one end of the intelligent sensing tendon away from the traction section.

[0021] In a second aspect, the application further provides a manufacturing method of the prestressed intelligent steel strand of the containment, comprising the following steps: wrapping a plurality of side wires around the outer periphery of the intelligent sensing tendon, and reserving a preset length of one end of the plurality of side wires as a traction section; and fixedly connecting a traction middle wire in the traction section to manufacture the prestressed intelligent steel strand of the containment.

[0022] Beneficial effects: the collaborative deformation effect of the intelligent sensing tendon and the plurality of side wires is achieved by wrapping the plurality of side wires around the outer periphery of the intelligent sensing tendon, the intelligent steel strand has the geometric, mechanical and sensing performance meeting the actual engineering long-term monitoring needs, and the prestress distribution data can be accurately tested.

[0023] In a third aspect, the application further provides a construction method of a prestressed system, comprising the following steps: manufacturing a prestressed steel strand by using the prestressed intelligent steel strand of the containment; marking a positioning mark point on the prestressed steel strand, which is located at the joint position of the reserved length in the containment structure and the working length outside the containment structure; performing the threading of the prestressed steel strand in the prestressed hole through the traction section until the positioning mark point reaches the joint position; performing the tensioning of the prestressed steel strand, and collecting the tensioning stage data in real time through the first optical fiber jumper head; cutting off the traction section and the first optical fiber jumper head in the prestressed steel strand; pulling out the end of the intelligent sensing tendon from the sealing anchor structure, fixedly connecting the sealing anchor structure on the surface of the containment structure, sealing the sealing anchor structure through the sealing assembly, and performing the pressure grouting on the prestressed hole; connecting the second optical fiber jumper head at both ends of the intelligent sensing tendon, and inserting the second optical fiber jumper head into the corresponding channel of the optical grating demodulator to collect the monitoring data of the prestressed intelligent steel strand in real time.

[0024] Beneficial effects: through the construction method of the prestress system, both the threading and fixing of the prestress intelligent steel strand in the containment structure and the accurate monitoring of the prestress condition in the containment structure can be realized; the prestress distribution data of the containment of the nuclear power plant are obtained through the prestress intelligent steel strand, the data collection of the effective prestress of the containment in the whole life is realized, and data support is provided for safety assessment; data support and basis are provided for safety analysis and damage positioning of the prestress system of the containment. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the specific embodiments or related art, the drawings needed to be used in the specific embodiments or related art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0026] Figure 1 It is a front view of a prestress intelligent steel strand of a containment of an embodiment of the present application;

[0027] Figure 2 It is a front view of a prestress intelligent steel strand of a containment of an embodiment of the present application;

[0028] Figure 3 It is Figure 2 It is an enlarged structural schematic view of A in the middle;

[0029] Figure 4 It is a structural schematic view of an anchoring structure of an embodiment of the present application;

[0030] Figure 5 It is a front view of an anchoring structure of an embodiment of the present application;

[0031] Figure 6 It is a structural schematic view of a connecting assembly and a plugging assembly of an embodiment of the present application;

[0032] Figure 7 It is a front view of a connecting assembly and a plugging assembly of an embodiment of the present application;

[0033] Figure 8 It is a flow chart of a construction method of a prestress system of an embodiment of the present application.

[0034] BRIEF DESCRIPTION OF DRAWINGS

[0035] 1, intelligent sensing muscle; 11, fiber grating cable; 2, edge wire; 21, sensing section; 22, traction section; 3, traction wire; 41, anchor cover; 411, first connecting piece; 42, connecting assembly; 422, second connecting piece; 4221, third through hole; 4222, first external thread; 423, connecting conversion piece; 4231, first internal thread hole; 424, third connecting piece; 4241, threaded section; 4242, cover plate; 425, fourth connecting piece; 4251, fifth through hole; 4252, third external thread; 426, flexible washer; 43, plugging assembly; 431, plugging head; 4311, first through hole; 432, plugging cover; 4321, second through hole; 5, protective sleeve; 6, extruded anchor; 7, first fiber jumper head. DETAILED DESCRIPTION

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings for the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0037] The prestressed system is generally used in the containment structure, and the prestressed steel strand is a key stressed component in the prestressed system. The stress state and the actual prestress size of the prestressed steel strand play a key role in the normal service function and safety of the containment structure. When the prestress loss is serious, the containment structure can even be damaged. Therefore, it is very important to effectively monitor and evaluate the actual prestress in the prestress loading to the containment structure and in the long-term service load stage of the containment structure. From the monitoring method of the prestress, the monitoring method can be mainly divided into two types of indirect monitoring method and direct monitoring method. The indirect monitoring method is to monitor the deflection, stiffness and concrete strain of the prestressed concrete structure member, and then calculate the prestress loss according to the structure form. This method is easy to implement, but the test precision is low and cannot meet the engineering needs. The direct monitoring method is to directly monitor the stress of the prestressed steel strand, mainly including the pressure gauge method, the pressure sensor method and the direct sticking method. Due to the characteristics of the prestressed concrete structure and the defects of the sensor itself, these methods still have various deficiencies, for example, the pressure gauge method can only be used in the construction stage; the pressure sensor method is expensive and is arranged at the end of the structure without distribution information; the direct sticking method has a complex construction process and a low survival rate.

[0038] The embodiments of the present application will be described below in combination with Figures 1 to 8 .

[0039] According to the embodiment of the present application, in one aspect, a prestressed intelligent steel strand for a containment vessel is provided, comprising an intelligent sensing tendon 1, a plurality of edge wires 2, and a traction center wire 3; the intelligent sensing tendon 1 is used for monitoring the prestressed value; the plurality of edge wires 2 are arranged in a ring structure around the outer periphery of the intelligent sensing tendon 1, the ring structure comprising a sensing section 21 and a traction section 22, both ends of the intelligent sensing tendon 1 being protruded from the sensing section 21; the traction section 22 has a fixed connection at one end of the sensing section 21 in a working position, and a separation position separated from the sensing section 21; when the traction section 22 is in the working position, the part of the intelligent sensing tendon 1 protruding from the sensing section 21 is located in the traction section 22; the traction center wire 3 is arranged on the same axis as the intelligent sensing tendon 1, fixedly connected in the traction section 22, one end being arranged in a spaced manner with the intelligent sensing tendon 1, and the other end being protruded from the traction section 22.

[0040] When the traction section 22 is in the working position, by setting the traction section 22 and the traction center wire 3 as the insertion end of the prestressed intelligent steel strand for the containment vessel in the prestressed hole, and the tensioning operation end outside the containment vessel structure, the wear or strain of the intelligent sensing tendon 1 can be reduced, the intelligent sensing tendon 1 is effectively protected, and the construction cost is reduced; after tensioning is completed, the traction section 22 can be cut to make the traction section 22 in the separation position, so that both ends of the intelligent sensing tendon 1 can be arranged protruding from both ends of the sensing section 21. After the construction of the prestressed intelligent steel strand for the containment vessel is completed, one end of the traction section 22 is exposed on the surface of the containment vessel structure. In order to avoid the length of the prestressed intelligent steel strand for the containment vessel exposed on the surface of the containment vessel structure being too long, which will affect the strength and ductility of the concrete in the containment vessel, part of the prestressed intelligent steel strand for the containment vessel exposed outside needs to be cut off. By setting the separation position of the traction section 22, the intelligent sensing tendon 1 can be avoided from being cut off, and the construction cost is further saved.

[0041] In a specific embodiment, the intelligent sensing tendon 1 comprises a carbon fiber composite tendon and an optical fiber grating cable 11, and the optical fiber grating cable 11 is encapsulated in the centroid axis of the carbon fiber composite tendon by a heat setting method.

[0042] Specifically, the edge wire 2 is provided with six, the nominal diameters of the intelligent sensing tendon 1, the edge wire 2, and the center wire are consistent.

[0043] In one embodiment, the anchoring structure further comprises an anchoring cover 41, a connecting assembly 42 and a plugging assembly 43; the anchoring cover 41 is provided with a first through hole and is adapted to be arranged at the end of the prestressed hole and fixedly connected to the surface of the containment structure; the connecting assembly 42 is detachably connected at the first through hole and is provided with a second through hole in the axial direction; the plugging assembly 43 is connected with the connecting assembly 42 and is provided with a third through hole in the axial direction; the third through hole is communicated with the second through hole; the end of the intelligent sensing tendon 1 passes through the second through hole and the third through hole in sequence and is sealingly fitted with the third through hole.

[0044] By setting the second through hole and the third through hole in the anchoring structure, the intelligent sensing tendon 1 can be passed out of the anchoring structure and connected with external equipment for signal transmission; by setting the plugging assembly 43, the sealing property of the anchoring structure can be ensured, and the effects of rust prevention, corrosion prevention and pollution prevention can be achieved; by setting the first through hole and the connecting assembly 42, the plugging assembly 43 can be fixedly connected with the anchoring cover 41.

[0045] Specifically, the diameter of the first through hole is 22mm±1mm.

[0046] In one embodiment, the plugging assembly 43 comprises a plugging head 431 and a plugging cover 432; the plugging head 431 is clamped in the second through hole and is provided with a first through hole 4311 in the axial direction; the plugging cover 432 is arranged on the connecting assembly 42 and is provided with a second through hole 4321, and the second through hole 4321 is communicated with the first through hole 4311 to form the third through hole.

[0047] By setting the plugging head 431, the intelligent sensing tendon 1 can be passed out of the anchoring structure, and the anchoring structure can be plugged; by setting the plugging cover 432, the plugging head 431 can be fixedly connected on the connecting assembly 42.

[0048] Specifically, the plugging cover 432 can be made of copper or stainless steel; the plugging head 431 can be made of copper.

[0049] Specifically, the plugging head 431 can be an elliptical structure, and the maximum outer diameter of the plugging head 431 is greater than the diameter of the second through hole 4321.

[0050] In one embodiment, the two ends of the connecting assembly 42 are threadedly connected with the anchoring cover 41 and the plugging cover 432, respectively.

[0051] The two ends of the connecting assembly 42 are respectively screwed with the sealing anchor cover 41 and the sealing cover 432, facilitating the connection and disassembly between the connecting assembly 42, the sealing anchor cover 41 and the sealing cover 432, facilitating the adjustment of the opening position of the first through hole according to the position of the intelligent sensing rib 1, ensuring that the first through hole and the intelligent sensing rib 1 are on the same axis, improving the connection precision between the intelligent sensing rib 1 and the sealing anchor structure, and preventing the bending damage of the intelligent sensing rib 1.

[0052] In a specific embodiment, the connecting assembly 42 comprises a second connecting piece 422, a connecting conversion piece 423, a third connecting piece 424 and a fourth connecting piece 425; the second connecting piece 422 is provided with a third through hole 4221 in the axial direction, one end of which is located in the sealing anchor cover 41, and the other end of which protrudes from the sealing anchor cover 41 through the first through hole and is provided with a first external thread 4222; the connecting conversion piece 423 is provided with a first internal thread hole 4231 in the axial direction, and the first external thread 4222 is screwed with one end of the first internal thread hole 4231; the third connecting piece 424 comprises a threaded segment 4241 and a cover plate 4242, the threaded segment 4241 is provided with a fourth through hole in the axial direction, and the outer periphery of the threaded segment 4241 is provided with a second external thread, which is screwed with the other end of the first internal thread hole 4231; the cover plate 4242 is fixedly connected with the threaded segment 4242, and the cover plate 4242 is provided with a second internal thread hole, and the fourth through hole and the second internal thread hole are communicated; the fourth connecting piece 425 is provided with a fifth through hole 4251 in the axial direction, and the outer periphery of the fourth connecting piece 425 is provided with a third external thread 4252, one end of which is screwed with the second internal thread hole; the third through hole 4221, the first internal thread hole 4231, the fourth through hole and the fifth through hole 4251 are communicated to form a second through hole.

[0053] In a specific embodiment, the sealing cover 432 is provided with a third internal thread hole, and the other end of the third external thread 4252 is screwed with the third internal thread hole.

[0054] Specifically, the second connecting piece 422 is a jackscrew, and a flexible gasket 426 is arranged between the second connecting piece 422 and the cover plate 4242; the fourth connecting piece 425 is a double-headed bolt.

[0055] Specifically, the second connecting piece 422, the connecting conversion piece 423, the third connecting piece 424 and the fourth connecting piece 425 can be made of copper or stainless steel.

[0056] Preferably, the outer diameter of the connecting conversion piece 423 is greater than the diameter of the first through hole, which can seal the first through hole; and the outer diameter of the cover plate 4242 is greater than the outer diameter of the connecting conversion piece 423, which ensures the sealing effect of the sealing anchor structure.

[0057] In an alternative embodiment, one end of the fourth connecting piece 425 is directly screwed with the first through hole, and the other end is screwed with the sealing cover 432.

[0058] In one embodiment, the outer periphery of the sealing anchor cover 41 is provided with a plurality of first connecting pieces 411, which are arranged at intervals along the outer periphery of the sealing anchor cover 41 and are fixedly connected with the surface of the containment structure.

[0059] Through the arrangement of the plurality of first connecting pieces 411, the sealing anchor cover 41 can be tightly fixed to the surface of the containment structure, so that the sealing anchor cover 41 maintains a correct positional relationship with the containment structure, forming a stable overall structure.

[0060] Specifically, the first connecting piece 411 includes a fixed plate and two reinforcing plates, the fixed plate is provided with a connecting hole, and a fastener passes through the connecting hole and is fixedly connected with the surface of the containment structure; the first side edge of the reinforcing plate is fixedly connected with the sealing anchor cover 41, the second side edge is fixedly connected with the fixed plate, and the first side edge and the second side edge are arranged adjacent to each other.

[0061] In one embodiment, it further includes a protective sleeve 5, which is sleeved on the end of the sensing section 21 away from the traction section 22.

[0062] Through the arrangement of the protective sleeve 5, the end of the sensing section 21 away from the traction section 22 can be protected from external friction damage.

[0063] Preferably, the protective sleeve 5 can be made of copper material, and fluorine (F) and germanium (GE) elements can be added to the protective sleeve 5 to reduce the influence of nuclear radiation.

[0064] In one embodiment, it further includes an extrusion anchor 6, which is located at the position of the traction section 22, and the plurality of edge wires 2 are fixedly connected with the traction center wire 3 through the extrusion anchor 6.

[0065] Through the arrangement of the extrusion anchor 6, reliable friction connection is formed between the edge wire 2 and the traction center wire 3 and the extrusion anchor 6, so that the edge wire 2 of the traction section 22 and the traction center wire 3 can be tightly connected, and in the use process of the traction section 22, the relative slipping between the edge wire 2 and the traction center wire 3 is avoided, and the reliability of the prestressed intelligent steel strand is improved.

[0066] In one embodiment, it further includes a first optical fiber jumper head 7, which is located at the end of the intelligent sensing muscle 1 away from the traction section 22 and is connected with the intelligent sensing muscle 1, and is used for outputting data signals.

[0067] By setting the first optical fiber jumper head 7 at the end of the smart sensing tendon 1 away from the traction section 22, the real-time collection of the prestress value of the prestressed smart steel strand during the tensioning process is realized.

[0068] According to the embodiment of the application, in a further aspect, there is also provided a manufacturing method of the prestressed smart steel strand of the containment, comprising the following steps: wrapping a plurality of edge wires 2 around the outer periphery of the smart sensing tendon 1, and reserving a preset length of one end of the plurality of edge wires 2 as the traction section 22; and fixedly connecting the traction middle wire 3 in the traction section 22 to manufacture the prestressed smart steel strand of the containment.

[0069] By wrapping the plurality of edge wires 2 around the outer periphery of the smart sensing tendon 1, the effect of the cooperative deformation of the smart sensing tendon 1 and the plurality of edge wires 2 is achieved, so that the smart steel strand has geometric, mechanical and sensing properties that meet the actual engineering long-term monitoring needs, and the prestress distribution data can be accurately tested.

[0070] According to the embodiment of the application, in a further aspect, there is also provided a construction method of a prestressed system, comprising the following steps: manufacturing a prestressed steel strand by using the prestressed smart steel strand of the containment; marking a positioning mark point on the prestressed steel strand, the positioning mark point being located at the joint position of the reserved length in the containment structure and the working length outside the containment structure; threading the prestressed steel strand in the prestressed hole through the traction section 22 until the positioning mark point reaches the joint position; tensioning the prestressed steel strand and collecting the tensioning stage data in real time through the first optical fiber jumper head 7; cutting off the traction section 22 and the first optical fiber jumper head 7 in the prestressed steel strand; pulling the end of the smart sensing tendon 1 out of the anchoring structure, fixedly connecting the anchoring structure on the surface of the containment structure, plugging the anchoring structure through the plugging assembly 43, and pressure grouting the prestressed hole; connecting the second optical fiber jumper head at both ends of the smart sensing tendon 1 and inserting the second optical fiber jumper head into the corresponding channel of the optical grating demodulator to collect the monitoring data of the prestressed smart steel strand in real time.

[0071] Through the construction method of the prestressed system, the threading and fixing of the prestressed smart steel strand in the containment structure can be realized, and the accurate monitoring of the prestress condition in the containment structure can also be realized; the prestress distribution data of the containment of the nuclear power plant is obtained through the prestressed smart steel strand, the data collection of the effective prestress of the containment during the whole life is realized, and data support is provided for safety evaluation; data support and basis are provided for safety analysis and damage positioning of the prestressed system of the containment.

[0072] In a specific embodiment, one end of the traction section 22 is used as the tensioning end during the tensioning process, the length of the traction section 22 is greater than the working length outside the containment structure, the positioning mark point is arranged on the traction section 22, and the end of the intelligent sensing tendon 1 is arranged at a distance from the positioning mark point to avoid damaging the intelligent sensing tendon 1 during the tensioning process.

[0073] Specifically, the positioning mark point can be sprayed on the prestressed steel beam with red paint.

[0074] In a specific embodiment, the horizontal ring direction is inserted into the prestressed duct by a single strand insertion method, that is, the ring direction prestressed steel beam is made of a single prestressed intelligent steel strand.

[0075] Specifically, the working length of the prestressed intelligent steel strand outside the containment structure includes a tensioning section, and the single strand insertion method specifically includes: slowly unwinding the prestressed intelligent steel strand through a cable laying reel; passing the traction section 22 through the pressure roller of the insertion machine; putting a specially designed small insertion cap on the end of the traction section 22 and inserting it into the guide pipe; when the prestressed intelligent steel strand reaches the insertion tool at the tensioning section, replace the specially designed large insertion cap and use the insertion machine to send the prestressed intelligent steel strand into the steel beam guide pipe; the construction personnel at the intersection position inform the construction personnel at the end of the tensioning section away from the containment structure and maintain contact, and press the insertion machine quick button to insert the prestressed intelligent steel strand, when the prestressed intelligent steel strand is exposed from the insertion tool at the tensioning section, slow down the insertion speed until the positioning mark point reaches the designated position, and then stop the insertion machine.

[0076] In a specific embodiment, the vertical direction is inserted into the prestressed duct by a whole insertion method, that is, the vertical prestressed steel beam is made of a single prestressed intelligent steel strand and multiple ordinary steel strands.

[0077] Specifically, the whole insertion method specifically includes: inserting the exposed traction middle wire 3 of the prestressed intelligent steel strand and the middle wires of the multiple ordinary steel strands into the traction device to make a vertical prestressed steel beam, and using a heading machine to head the end; connecting the traction device and the winch wire rope, starting the winch to pull the vertical prestressed steel beam into the prestressed duct according to the design requirements; when the vertical prestressed steel beam is exposed from the insertion tool at the tensioning section, slow down the operation speed of the winch, and when the positioning mark point reaches the designated position, stop the winch to stop the insertion.

[0078] Specifically, after the vertical prestressed steel beam is fixed on the traction device, red paint is sprayed at an obvious position on the outside as a positioning mark point.

[0079] In a specific embodiment, after the prestressed steel tendon is installed and penetrated into a set position, a limiting plate, a working anchor, a jack and other structures are installed to perform tensioning and other construction operations. When the jack and the tool anchor are used, attention should be paid to the protection of the end of the prestressed intelligent steel strand to avoid damage to the prestressed intelligent steel strand caused by heavy pressure and hammering.

[0080] In a specific embodiment, the first optical fiber jumper head 7 is inserted into the corresponding channel of the optical fiber grating demodulator during the tensioning process of the prestressed steel tendon to collect the prestressed data in real time during the tensioning stage.

[0081] In a specific embodiment, the design length of the traction section 22 is consistent with the excess length of the prestressed steel tendon at the end of the prestressed steel tendon after the tensioning of the prestressed steel tendon is completed. After the tensioning of the prestressed steel tendon is completed, the first optical fiber jumper head 7 is pulled out of the corresponding channel of the optical fiber grating demodulator, the tensioning equipment and the tooling are removed, the first optical fiber jumper head 7 is cut off, and the excess length of the prestressed steel tendon at the end is cut off, i.e. the length corresponding to the traction section 22 is cut off.

[0082] Specifically, the traction section 22 is cut off in the circumferential prestressed steel tendon; the traction section 22 and the length corresponding to the ordinary steel strand and the traction section 22 are cut off in the vertical prestressed steel tendon, so as to ensure that the end of the ordinary steel strand is consistent with the length of the edge wire 2 of the prestressed intelligent steel strand.

[0083] Specifically, the anchor sealing structure is arranged at both ends of the prestressed hole; and the prestressed hole is pressure grouted through the grouting hole.

[0084] Specifically, the carbon fiber composite tendon is cut off in a ring shape at one end of the intelligent sensing tendon 1 located outside the anchor sealing structure, then the second optical fiber jumper head is fused with the exposed optical fiber grating cable 11, the second optical fiber jumper head is inserted into the corresponding channel of the optical fiber grating demodulation equipment, and the monitoring data of the intelligent steel strand to the prestressed value is collected in real time.

[0085] Specifically, the distance between the end of the cut carbon fiber composite tendon and the top surface of the anchor sealing cover 41 is 200 mm.

[0086] Although the embodiments of the present application are described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope defined by the appended claims.

Claims

1. A prestressed intelligent steel strand for a containment vessel, characterized in that, The utility model relates to a kind of intelligent sensing tendon (1) for monitoring prestressed value;Multiple edge wires (2) are arranged in annular structure around the outer periphery of the intelligent sensing tendon (1), the annular structure includes sensing section (21) and traction section (22), both ends of the intelligent sensing tendon (1) are arranged in the sensing section (21) and protrude;The traction section (22) has fixedly connected in the sensing section (21) one end working position, and separate position separated from the sensing section (21);When the traction section (22) is in the working position, the part of the intelligent sensing tendon (1) that protrudes from the sensing section (21) is located in the traction section (22);Traction wire (3) is fixedly connected in the traction section (22) with the intelligent sensing tendon (1) arranged on the same axis, one end is arranged with the intelligent sensing tendon (1) with interval, and the other end protrudes from the traction section (22);When tensioning is completed, the traction section (22) is cut, so that the traction section (22) is in the separate position, both ends of the intelligent sensing tendon (1) can be arranged in both ends of the sensing section (21) and protrude. It also includes an anchor sealing structure, which includes: An anchor sealing cover (41) is provided with a first through hole, which is suitable for being arranged at the end of the prestressed hole, and is fixedly connected to the surface of the safety shell structure; A connecting assembly (42) is detachably connected at the first through hole and is provided with a second through hole in the axial direction; A sealing assembly (43) is connected with the connecting assembly (42) and is provided with a third through hole in the axial direction; the third through hole communicates with the second through hole; 2. The pre-stressed smart steel strand for a containment vessel according to claim 1, wherein, The end of the intelligent sensing tendon (1) passes through the second through hole and the third through hole in sequence and is in sealing cooperation with the third through hole. The sealing assembly (43) includes: A sealing head (431) is clamped in the second through hole and is provided with a first through hole (4311) in the axial direction; A sealing cover (432) is arranged on the connecting assembly (42) and is provided with a second through hole (4321), which communicates with the first through hole (4311) to form the third through hole. Both ends of the connecting assembly (42) are threadedly connected with the anchor sealing cover (41) and the sealing cover (432), respectively.

3. The pre-stressed smart steel strand for a containment vessel of claim 2, wherein, The outer periphery of the anchor sealing cover (41) is provided with a plurality of first connecting members (411), and a plurality of first connecting members (411) are arranged at intervals along the outer periphery of the anchor sealing cover (41) and are fixedly connected with the surface of the safety shell structure. It also includes a protective sleeve (5) which is arranged on the end of the sensing section (21) away from the traction section (22). It also includes an extrusion anchor (6) which is located at the position of the traction section (22), and a plurality of edge wires (2) are fixedly connected with the traction wire (3) through the extrusion anchor (6).

4. The pre-stressed smart steel strand for a containment vessel of claim 3, wherein, It also includes a first optical fiber jumper head (7) which is located at the end of the intelligent sensing tendon (1) away from the traction section (22) and is connected with the intelligent sensing tendon (1) for outputting data signals.

5. The pre-stressed smart steel strand for a containment vessel of claim 2, wherein, ​ 6. The pre-stressed smart steel strand for containment vessels according to any one of claims 1 to 5, characterized in that, ​ 7. The pre-stressed smart steel strand for containment vessels according to any one of claims 1 to 5, characterized in that, ​ 8. The pre-stressed smart steel strand for containment vessels according to any one of claims 1 to 5, characterized in that, ​ 9. A method of manufacturing the pre-stressed smart steel strand of the containment vessel of any one of claims 1 to 8, characterized in that, The method comprises the following steps: a plurality of edge wires (2) are wrapped around the outer periphery of the intelligent sensing tendon (1), and one end of the plurality of edge wires (2) is reserved as a predetermined length of a traction section (22); the traction middle wire (3) is fixedly connected in the traction section (22) to form the prestressed intelligent steel strand of the containment of any one of claims 1 to 8.

10. A method of constructing a prestressed system, characterized in that, The method comprises the following steps: The prestressed intelligent steel strand of the containment of any one of claims 1 to 8 is used to manufacture a prestressed steel beam; positioning mark points are made on the prestressed steel beam, and the positioning mark points are located at the intersection position of the reserved length in the containment structure and the working length outside the containment structure; the prestressed steel beam is threaded through the prestressed duct through the traction section (22) until the positioning mark points reach the intersection position; the prestressed steel beam is tensioned, and the tensioning stage data is collected in real time through the first optical fiber jumper head (7); the traction section (22) and the first optical fiber jumper head (7) in the prestressed steel beam are cut off; the ends of the intelligent sensing tendon (1) are pulled out from the anchoring structure, the anchoring structure is fixedly connected to the surface of the containment structure, the anchoring structure is blocked by the blocking assembly (43), and the prestressed duct is pressure grouted; second optical fiber jumper heads are connected to the two ends of the intelligent sensing tendon (1), and the second optical fiber jumper heads are inserted into the corresponding channels of the optical fiber grating demodulator to collect monitoring data of the prestressed intelligent steel strand in real time.

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