CN113982306A - Cantilever structure tension reinforcing system and construction method - Google Patents
Cantilever structure tension reinforcing system and construction method Download PDFInfo
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- 230000002787 reinforcement Effects 0.000 claims description 33
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Abstract
The invention provides a cantilever structure tension reinforcing system and a construction method. According to the construction method of the cantilever structure tension reinforcing system, a plurality of V-shaped support structures of the tension reinforcing system are arranged at intervals along the circumferential direction of an inner ring of an original cantilever structure; the cable net component comprises radial cables and circumferential cables, the circumferential cables are arranged along the circumferential direction and connected with the bottom ends of the V-shaped support structures, one ends of the radial cables are connected with the circumferential cables, and the other ends of the radial cables are connected with the original cantilever structure after being tensioned along the radial direction; the newly-added cantilever structure is arranged above the elevation of the circumferential cable, and one end of the rigid member is connected with the newly-added cantilever structure; the monitoring device is arranged at the tail end of the radial cable and used for monitoring the stress state of the corresponding radial cable and automatically sending an early warning signal to the background system. Through V props structure and cable net subassembly, realize the enhancement maintenance to old building. The stress state of the radial cable is monitored by adding the monitoring device, the later-stage operation and maintenance efficiency is improved, the internal force distribution and the deformation control of the structure and the cable force are controlled, and the cost is saved.
Description
Technical Field
The invention belongs to the technical field of urban building maintenance and updating, and particularly relates to a cantilever structure tension reinforcing system and a construction method.
Background
The "tensegrity" concept is the invention of the fullerene of the famous architect in the united states, the rigidity of the structure is provided by the balance prestress between the tension unit and the compression unit, the structure has almost no initial rigidity before the prestress is applied by the world, the size of the initial prestress plays a decisive role in the appearance of the structure and the rigidity of the structure, and the tensegrity structure is a flexible structure form which can make the most of the material performance. The current common tensioning integral structure is formed by an orthogonal bidirectional type, a self-balancing unit type and an annular cable truss structure.
At present, many old buildings are about to reach the design service life or some large-scale public building structures face the problem of change of use function, etc., and often there is the additional structure that needs to be added in order to satisfy new use function demand, uses tension structure to carry out the increase of additional structure to original building, is favorable to alleviateing the dead weight load of additional structure, improves the structural resistance of additional structure, realizes the additional construction of larger-scale additional structure.
At present, routine maintenance and preventive maintenance means are used for maintaining large public buildings, and whether the buildings have the possibility of failure or not, manpower, material resources and time cost are wasted for maintaining the buildings.
Disclosure of Invention
In view of the above, the present invention provides an overhanging structure tension-reinforcing system.
The invention further provides a construction method of the cantilever structure tension reinforcing system.
In order to solve the technical problems, the invention adopts the following technical scheme:
according to an embodiment of the first aspect of the present invention, an overhanging structure tension reinforcing system is used as an additional auxiliary tension structure during maintenance of an original overhanging structure, and the tension reinforcing system includes:
the cantilever structure comprises a plurality of V-shaped support structures, a plurality of V-shaped support structures and a plurality of elastic pieces, wherein the V-shaped support structures are arranged at intervals along the circumferential direction of an inner ring of the original cantilever structure, any V-shaped support structure comprises a V-shaped support arranged below the inner ring of the original cantilever structure and a rigid member, one end of the rigid member is connected with the inner ring of the original structure, the other end of the rigid member extends inwards along the radial direction, one end of the V-shaped support is connected with the inner ring of the cantilever structure, and the other end of the V-shaped support is connected with the rigid member;
the cable net assembly comprises radial cables and circumferential cables, the circumferential cables are arranged along the circumferential direction and connected with the bottom ends of the V-shaped support structures, one ends of the radial cables are connected with the circumferential cables, and the other ends of the radial cables are connected with the original cantilever structure after being tensioned along the radial direction;
the newly-added cantilever structure is arranged on the inner ring of the original cantilever structure and is suspended above the elevation of the annular cable, and the other end of the rigid member is connected with the newly-added cantilever structure;
the monitoring device is arranged at one end of the radial cable connected with the original cantilever structure and used for monitoring the stress state of the radial cable and automatically sending an early warning signal to the background system.
Further, the tension reinforcement system further comprises:
the triangular support is welded on the inner side of the inner ring truss of the original cantilever structure, and the V-shaped support structure is connected with the inner ring of the original cantilever structure through the triangular support.
Further, the tension reinforcement system further comprises:
the cable clamp is arranged on the annular cable, and one end of the radial cable is connected to the cable clamp.
Further, the V-shaped support comprises an inner limb and an outer limb, the inner limb and the outer limb are arranged at an included angle, the other end of the outer limb is connected with the tripod, and the other end of the inner limb is connected with the rigid member;
the cable clamp is connected to the outer limb.
Furthermore, the newly-added cantilever structure comprises two circles of ring-shaped structures which are concentrically arranged at intervals and matched with the inner ring of the original cantilever structure, and any one of the ring-shaped structures comprises a plurality of main connecting rods which are arranged along the circumferential direction and a secondary connecting rod which is connected with two adjacent main connecting rods;
the main connecting rod and the V-shaped support are coplanar;
the number of the secondary connecting rods is two, and the secondary connecting rods are respectively connected to two sides of the rigid member.
Further, the tension reinforcement system further comprises:
the truss ear plate, the truss ear plate sets up the outer lane truss support department of original structure of encorbelmenting, the other end of radial cable with the truss ear plate is connected.
Further, the monitoring device is a force sensor.
According to the second aspect of the invention, the construction method of the cantilever structure tension reinforcement system comprises the following steps:
propping the original cantilever structure to release partial stress in advance;
reinforcing a weak rod piece of an original cantilever structure;
hoisting the outer limb of the V-shaped support structure, and temporarily fixing;
erecting a cable laying platform, laying a circumferential cable, and installing a cable clamp at the corresponding position of the circumferential cable;
transferring the radial cable to the axial position of a corresponding cable clamp, vertically hoisting, releasing the torsion of the stay cable, then pulling the stay cable to the ear plate end of the ring beam by a winch, and connecting the radial cable with the cable clamp;
after the radial cable is installed, continuously drawing and tensioning to make the angle of the radial cable continuously close to a design value;
mounting the inner limb and the rigid member of the V-shaped support structure to complete the mounting of the newly-added cantilever structure;
and a monitoring device is arranged at the tail end of the radial cable to monitor the stress state of the radial cable.
Further, when the original cantilever structure is jacked, a hydraulic control adjustable unloading support system is installed below the original cantilever structure, and synchronous supporting work is carried out through a hydraulic jack;
after the step of finishing the installation of the newly-added cantilever structure and before the step of arranging the monitoring device at the tail end of the radial cable, the method further comprises the following steps of:
and (4) unloading and dismantling the adjustable unloading support system.
Further, in the step of laying the circumferential cables, firstly, the circumferential cables are laid below the preset positions by using a crane, and the cables are moved and placed on the cable laying platform and the scaffold platform;
and then, installing and fixing a cable clamp at the corresponding position of the annular cable, and then obliquely upwards drawing and lifting the directional cable to a preset position.
The technical scheme of the invention has the following beneficial effects:
according to the tension reinforcing system of the cantilever structure, the newly-added cantilever structure is used for bearing the load of the use function of the newly-added part, and the V-shaped support structure can downwards transmit the load part of the newly-added cantilever structure into the cable net component. By tensioning the radial cables, pre-tensioning stress is formed in the whole cable net component to offset the compressive stress generated by the load of the newly added structure part. Through the V-shaped support structure and the cable net assembly, a full-tension newly-added auxiliary structure system based on prestress is established, and the reinforced maintenance of the old building is realized. The stress state of the radial cable is monitored by adding the monitoring device, the tension reinforcement system is monitored informationally, the later-stage operation and maintenance efficiency is improved, the maintenance is carried out when the tension reinforcement system is suitable and needed, and the cost is saved. Meanwhile, the internal force distribution of the structure and the cable force and the deformation can be controlled.
Drawings
FIG. 1 is a schematic structural diagram of an original cantilever structure according to an embodiment of the present invention;
FIG. 2 is a schematic structural view of a tension reinforcement system (omitting monitoring devices, cable clamps and truss ear plates) according to an embodiment of the invention;
fig. 3 is a schematic structural diagram of one unit (a V-brace structure and two sections of newly added cantilever structures) of a tension reinforcement system (omitting a monitoring device, a cable clamp and a truss ear plate) according to an embodiment of the invention;
FIG. 4 is a schematic structural view of a tension reinforcement system installed on an existing cantilever structure according to an embodiment of the present invention;
fig. 5 is a frame diagram illustrating a construction method of a tension reinforcement system according to an embodiment of the present invention.
Reference numerals: 1. the original cantilever structure; 11. an inner ring of the original cantilever structure; 12. an outer ring of an original cantilever structure; 2. a tension reinforcement system; 21. newly adding an overhanging structure; 211. a main link; 22. a V-bracing structure; 221. an inner limb; 222. an outer limb; 223. a rigid member; 23. a cable net assembly; 231. a circumferential cable; 232. a radial cable; 3. a tripod.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships are changed accordingly.
First, a cantilever structure tension reinforcement system according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
It should be noted that the original cantilever structure is an old building. As shown in fig. 1, the present embodiment takes a roof structure with a hollow inner ring as an example of the original cantilever structure.
As shown in fig. 2 to 4, the cantilever structure tension reinforcement system 2 according to the embodiment of the present invention includes a newly added cantilever structure 21, a plurality of V-stay structures 22, a cable net assembly 23, and a monitoring device (not shown).
Specifically, the V-bracing structure 22 is disposed below the inner ring 11 of the original overhanging structure, and the newly-added overhanging structure 21 is suspended above the V-bracing structure 22 and the cable net assembly 23. The V-shaped support structure 22 comprises a V-shaped support and a rigid member 223 extending radially inwards from the original cantilever structure inner ring 11, one end of the V-shaped support is connected with the original cantilever structure inner ring 11, the other end of the V-shaped support is connected with the rigid member 223, and the V-shaped support structure 22 can downwards transmit the load part of the newly-added cantilever structure 21 into the cable net assembly 23. The cable net assembly 23 comprises a radial cable 232 and a circumferential cable 231, the circumferential cable 231 is circumferentially arranged and connected with the bottom end of the V-shaped support, one end of the radial cable 232 is connected with the circumferential cable 231, and the other end of the radial cable 232 is connected with the original cantilever structure 1 after being radially and outwardly tensioned. The newly-added cantilever structure 21 is arranged above the elevation of the circumferential cable 231 and is used for bearing the load of part of the use functions of the tension reinforcing system. The other end of the rigid member 223 extends radially inward and is connected to the new cantilever structure 21. The monitoring device is arranged at one end of any radial cable 232 connected with the original cantilever structure 1 and is used for monitoring the stress state of the corresponding radial cable 232 and automatically sending an early warning signal to a background system (not shown) after monitoring that the stress exceeds a preset value of the radial cable 232.
In other words, the cantilever structure tension reinforcement system 2 according to the embodiment of the present invention mainly comprises four parts, namely, the newly added cantilever structure 21, the V-shaped support structure 22, the cable net assembly 23 and the monitoring device. The new cantilever structure 21 is used for bearing the load of the use function of the new part, and the V-shaped support structure 22 can transmit the load part of the new cantilever structure 21 downwards into the cable net component 23. By tensioning the radial cords 232, a pre-tension is created throughout the cable mesh assembly 23 to counteract the compressive stresses created by the loading of the newly added structural component. Therefore, according to the cantilever structure tension reinforcement system 2 provided by the embodiment of the invention, a full-tension newly-added auxiliary structure system based on prestress is established through the V-shaped support structure 22 and the cable net assembly 23, so that the reinforced maintenance of the old building is realized. Monitoring the stress state of the radial cable 232 by adding a monitoring device, realizing the informatization monitoring of the tension reinforcement system 2, improving the later-stage operation and maintenance efficiency, realizing the maintenance in proper and required time and saving the cost.
In some embodiments of the invention, the tension reinforcement system 2 further comprises a tripod 3. The V-shaped support structure 2 is connected with the inner ring 11 of the original cantilever structure through the tripod 3.
Specifically, as shown in fig. 3, the triangular frame 3 is a triangular prism frame, and is welded to the inner side edge of the inner ring truss of the original cantilever structure 1, and the V-brace and the rigid member 223 of the V-brace structure 2 are both connected to the triangular frame 3, so as to be connected to the original cantilever structure 1. Simple structure practices thrift the cost, and tripod 3's structural strength is big simultaneously, makes things convenient for V to prop structure 2 and current structure 1 of encorbelmenting to be connected.
In some embodiments of the present invention, the tension reinforcement system 2 further comprises a cable clip (not shown) disposed on the circumferential cable 231, and one end of the radial cable 232 is connected to the cable clip. The specific structure of the cable clip is not described and defined herein, and those skilled in the art can adopt the cable clip structure commonly used in the existing construction industry. The latching clip is a common connection of inner leg 221, outer leg 222, radial cable 232 and circumferential cable 231.
According to one embodiment of the present invention, the V-brace comprises an inner limb 221 and an outer limb 222, the inner limb 221 and the outer limb 222 are disposed at an angle, and the cable clamp is connected to the outer limb 222.
As shown in fig. 2 and 3, the inner leg 221 and the outer leg 222 of the V-stay are connected at their bottom ends, and the top end of the V-stay extends diagonally upward to both sides, wherein the top end of the inner leg 221 is connected to the rigid member 223 and the top end of the outer leg 222 is connected to the lower end of the tripod 3. One end of the rigid member 223 is connected to the upper end of the tripod 3, the other end extends horizontally radially inward, the top end of the inner limb 221 is not connected to the end of the rigid member 223, that is, the connecting position of the rigid member 223 and the top end of the inner limb 221 is a distance away from the end of the other end of the rigid member 223, which can be described as an extension for convenience of description and distinction, and the rigid member 223 can be connected to the new cantilever structure 21 conveniently.
According to an embodiment of the present invention, as shown in fig. 2 and 3, the newly added cantilever structure 21 includes two circles of concentric ring-shaped structures which are arranged at intervals and matched with the inner ring 11 of the original cantilever structure. Any ring-shaped structure comprises a plurality of main connecting rods 211 arranged along the circumferential direction and a secondary connecting rod (not shown in the figure) connecting two adjacent main connecting rods 211. That is to say, any circle-shaped structure is enclosed by a plurality of main connecting rods 211 of arc shape along the circumference end to end connection, and main connecting rod 211 and V prop structure 2 are specifically the coplanar of rigid component 223. Two adjacent main links 211 are connected by a sub link provided on both sides in the circumferential direction of the extension of the rigid member 223. The newly-added cantilever structure 21 has the function of conveniently building a roof panel and/or a roof membrane structure, and in an implemented stadium project of eighty thousand people, the newly-added cantilever structure 21 is a transparent membrane material with an LED screen. Adopt the mode of main connecting rod 211 and inferior connecting rod, make things convenient for step-by-step installation newly-increased structure of encorbelmenting, when avoiding whole installation, newly-increased structure 21 of encorbelmenting overweight and cause the inconvenient problem of installation.
According to an embodiment of the present invention, the tension reinforcement system 2 further includes a truss ear plate (not shown in the figure), the truss ear plate is disposed at an outer ring truss support of the original cantilever structure, that is, at a connection between the truss and the concrete (not shown in the figure), and the applicant has obtained through research and calculation that the other end of the radial cable is connected to the connection between the truss and the concrete, so that the stress performance of the whole system is the best, and the other end of the radial cable 232 is connected to the truss ear plate, thereby realizing the connection between the whole tension reinforcement system and the original cantilever structure 1. The specific structure of the truss ear plate is not described and limited in detail herein, and is an existing conventional ear plate structure. The truss ear plates are added, so that the radial cables can be conveniently connected with the original cantilever structure. Simple structure and can save cost. The tension reinforcement system 2 is subjected to a force analysis, as shown in fig. 3, in which the outer limb is subjected to a compressive force F and the radial cords 232 are subjected to a tensile force F.
According to one embodiment of the present invention, the monitoring device (not shown) is a conventional force sensor on the market, and the specific structure and operation principle are not described and defined in detail herein, and those skilled in the art can understand the prior art.
According to an embodiment of the invention, after the newly added auxiliary structure, namely the tension reinforcing system 2 is installed, as the tension system forms rigidity, a larger tension force needs to be applied, the requirement on the structural strength and resistance of the original cantilever structure is improved, the original cantilever structure needs to be reinforced, and according to different modes of insufficient bearing capacity of the original cantilever structure rod piece, three luminescence methods, namely an outer casing method, a welding steel pipe method and an FRP (fiber reinforced plastic) reinforcing method, are respectively adopted for reinforcement. Specifically, the rod piece which is not stable enough in whole under pressure is reinforced by an outer casing pipe; adopting a steel pipe sticking and welding method for the rod pieces with insufficient bearing capacity and stability in the whole type; a rod piece with insufficient tension bearing capacity is Reinforced by an FRP (Fiber Reinforced Polymer/Plastic) reinforcing method.
In summary, according to the cantilever structure tension reinforcement system 2 of the embodiment of the present invention, a new auxiliary structure system based on prestress tension is established through the V-brace structure 22 and the cable net assembly 23, which is beneficial to reducing the dead load of the additional structure, improving the structural resistance of the auxiliary structure, and realizing the large-scale additional structure construction and maintenance. The problem of current routine maintenance to large-scale public building, there is the building inefficacy when preventing to maintain, cause extravagant manpower and materials and time cost is solved. Meanwhile, a monitoring device is added, a coordinated working system of design, construction, installation and long-term operation and maintenance is realized, the informatization monitoring of the tension reinforcement system 2 is realized, the later-stage operation and maintenance efficiency is improved, the maintenance is realized when the operation and maintenance are appropriate and needed, and the cost is saved.
The construction method of the cantilever structure tension reinforcement system according to the embodiment of the second aspect of the invention, as shown in fig. 5, comprises the following steps:
a hydraulic control adjustable unloading support system (not shown) is arranged below the original cantilever structure 1, synchronous supporting work is carried out through a hydraulic jack (not shown), and partial stress of the original structure is released in advance;
reinforcing a weak rod piece of the original cantilever structure 1; specifically, in this embodiment, the rod member that is not entirely stable under pressure is reinforced by the outer casing; adopting a steel pipe sticking and welding method for the rod pieces with insufficient bearing capacity and stability in the whole type; reinforcing the rod piece with insufficient tensile bearing capacity by adopting an FRP (Fiber Reinforced Polymer/Plastic) reinforcing method;
welding a tripod 3 at the inner side edge of the inner ring of the truss of the original cantilever structure 1, and simultaneously winding a traction rope of a lifting winch of the hoop rope 231 around the tripod;
hoisting the outer limb 222 of the V-shaped support structure 22, and temporarily fixing the outer limb by using the immortal gourd after the outer limb 222 is in place;
erecting a cable laying platform, laying the circumferential cables 231 below a preset position by using a crane, and moving and laying the cables on the cable laying platform and the scaffold platform;
installing a rope clamp at a corresponding position of the annular rope 231 and fixing, and then using a winch to obliquely and upwards pull the lifting annular rope 231 to a preset position;
the radial cable 232 is transferred to the axial position of the corresponding cable clamp, and is vertically lifted, and the tension force of the stay cable is released; the hoist is then pulled to the ring beam lug end and the radial cable 232 is connected to the cable clamp.
After the radial cable 232 is installed, the angle of the radial cable 232 is continuously close to the designed position by continuously drawing and tensioning;
connecting the outer limb 222 in place with a cable clamp;
mounting the V-shaped support inner limb 221 and the rigid member 223, and finishing mounting the cantilever structure;
the adjustable force-unloading bracket system is subjected to force unloading and slow dismantling;
a monitoring device is arranged at the tail end of the radial cable 232, and the embodiment preferably adopts a conventional force sensor on the existing market to monitor the stress state of the radial cable 232 for a long time; if the reading change of the force sensor exceeds a set value, the background system automatically sends an early warning signal, and related personnel perform related maintenance and repair work on the cable.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "illustrative embodiments," "preferred embodiments," "detailed description," or "preferred embodiments" or the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. The utility model provides a structure tension system of consolidating encorbelmenting for as newly-increased subsidiary tension structure when original structure of encorbelmenting is maintained, its characterized in that, tension system of consolidating includes:
the cantilever structure comprises a plurality of V-shaped support structures, a plurality of V-shaped support structures and a plurality of elastic pieces, wherein the V-shaped support structures are arranged at intervals along the circumferential direction of an inner ring of the original cantilever structure, any V-shaped support structure comprises a V-shaped support arranged below the inner ring of the original cantilever structure and a rigid member, one end of the rigid member is connected with the inner ring of the original structure, the other end of the rigid member extends inwards along the radial direction, one end of the V-shaped support is connected with the inner ring of the cantilever structure, and the other end of the V-shaped support is connected with the rigid member;
the cable net assembly comprises radial cables and circumferential cables, the circumferential cables are arranged along the circumferential direction and connected with the bottom ends of the V-shaped support structures, one ends of the radial cables are connected with the circumferential cables, and the other ends of the radial cables are connected with the original cantilever structure after being tensioned along the radial direction;
the newly-added cantilever structure is arranged on the inner ring of the original cantilever structure and is suspended above the elevation of the annular cable, and the other end of the rigid member is connected with the newly-added cantilever structure;
the monitoring device is arranged at one end of the radial cable connected with the original cantilever structure and used for monitoring the stress state of the radial cable and automatically sending an early warning signal to the background system.
2. The cantilevered structural tension reinforcement system of claim 1, further comprising:
the triangular support is welded on the inner side of the inner ring truss of the original cantilever structure, and the V-shaped support structure is connected with the inner ring of the original cantilever structure through the triangular support.
3. The cantilevered structural tension reinforcement system of claim 2, further comprising:
the cable clamp is arranged on the annular cable, and one end of the radial cable is connected to the cable clamp.
4. The cantilevered structural tension reinforcement system of claim 3, wherein the V-brace comprises an inner limb and an outer limb, the inner limb and the outer limb being disposed at an included angle, the outer limb having another end connected to the tripod and the inner limb having another end connected to the rigid member;
the cable clamp is connected to the outer limb.
5. The cantilever structure tension reinforcement system according to claim 4, wherein the newly added cantilever structure comprises two circles of ring-shaped structures which are concentrically arranged at intervals and matched with the inner circle of the original cantilever structure, and any one of the ring-shaped structures comprises a plurality of main connecting rods which are arranged along the circumferential direction and a secondary connecting rod which is connected with two adjacent main connecting rods;
the main connecting rod and the V-shaped support are coplanar;
the number of the secondary connecting rods is two, and the secondary connecting rods are respectively connected to two sides of the rigid member.
6. The cantilevered structural tension reinforcement system of claim 1, further comprising:
the truss ear plate, the truss ear plate sets up the outer lane truss support department of original structure of encorbelmenting, the other end of radial cable with the truss ear plate is connected.
7. The cantilevered structural tension reinforcement system of claim 1, wherein the monitoring device is a force sensor.
8. A construction method of a cantilever structure tension reinforcing system is characterized by comprising the following steps:
propping the original cantilever structure to release partial stress in advance;
reinforcing a weak rod piece of an original cantilever structure;
hoisting the outer limb of the V-shaped support structure, and temporarily fixing;
erecting a cable laying platform, laying a circumferential cable, and installing a cable clamp at the corresponding position of the circumferential cable;
transferring the radial cable to the axial position of a corresponding cable clamp, vertically hoisting, releasing the torsion of the stay cable, then pulling the stay cable to the ear plate end of the ring beam by a winch, and connecting the radial cable with the cable clamp;
after the radial cable is installed, continuously drawing and tensioning to make the angle of the radial cable continuously close to a design value;
mounting the inner limb and the rigid member of the V-shaped support structure to complete the mounting of the newly-added cantilever structure;
and a monitoring device is arranged at the tail end of the radial cable to monitor the stress state of the radial cable.
9. The construction method of the cantilever structure tension reinforcement system according to claim 8, wherein when the existing cantilever structure is jacked, a hydraulic control adjustable unloading support system is installed below the existing cantilever structure, and synchronous supporting work is carried out through a hydraulic jack;
after the step of finishing the installation of the newly-added cantilever structure and before the step of arranging the monitoring device at the tail end of the radial cable, the method further comprises the following steps of:
and (4) unloading and dismantling the adjustable unloading support system.
10. The construction method of the cantilever structure tension reinforcement system according to claim 8, wherein in the step of laying the circumferential cables, the circumferential cables are laid below a preset position by a crane, and the cables are moved and laid on the cable laying platform and the scaffold platform;
and then, installing and fixing a cable clamp at the corresponding position of the annular cable, and then obliquely upwards drawing and lifting the directional cable to a preset position.
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