CN114991812A - Automatic control system for longitudinal and transverse servo type prestress of duct piece tunnel - Google Patents
Automatic control system for longitudinal and transverse servo type prestress of duct piece tunnel Download PDFInfo
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- E—FIXED CONSTRUCTIONS
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- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
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- G05B13/02—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric
- G05B13/04—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators
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Abstract
The invention relates to a longitudinal and transverse servo type prestress automatic control system of a segment tunnel, which comprises a prestressed cable tensioning part and a servo type automatic control device, wherein the prestressed cable tensioning part comprises a shield tunnel circumferential prestressed pipe and a longitudinal prestress reinforcing structure, the servo type automatic control device comprises an intelligent monitoring unit and an intelligent adjusting unit, the intelligent monitoring unit monitors tunnel parameters in real time, and the intelligent adjusting unit dynamically adjusts the longitudinal and transverse prestress by comprehensively analyzing dynamic data of a transverse and longitudinal deformation adjusting process according to the monitored tunnel parameters and combining longitudinal and transverse mechanical interaction relation. Compared with the prior art, the method can monitor and analyze the stress deformation state of the shield tunnel in real time, automatically stretch the prestressed steel strand, perform full-period control on the stress deformation of the tunnel, dynamically adjust the longitudinal and circumferential prestress through data real-time feedback, and effectively relieve or even eliminate the phenomena of tunnel joint deformation and longitudinal uneven settlement.
Description
Technical Field
The invention relates to the technical field of shield tunnels, in particular to a longitudinal and transverse servo type prestress automatic control system for a segment tunnel.
Background
The shield tunnel is formed by splicing segments, and during construction period and operation period, the shield tunnel is often influenced by uneven settlement, stress relaxation, near-engineering disturbance (shield crossing, near foundation pit excavation) and the like, so that segment joints are opened, cracked and leaked, and even the problem of traffic safety is caused. In the past, the shield tunnel is usually subjected to post-treatment by adopting modes such as foundation reinforcement or maintenance reinforcement, but the treatment difficulty is high, the cost is high, the timeliness of treatment cannot be guaranteed, and the normal operation of the tunnel is seriously influenced.
For this reason, the prior art considers segment lining adopting conventional prestressing measures, but this way cannot realize online regulation of prestressing, and is difficult to solve the above problems fundamentally.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a segment tunnel longitudinal and transverse servo type prestress automatic control system.
The purpose of the invention can be realized by the following technical scheme: the utility model provides a section of jurisdiction tunnel is servo formula prestressing force automatic control system from north to south, includes prestressing cable stretch-draw portion and the servo formula automatic control device who connects thereof, prestressing cable stretch-draw portion includes shield tunnel hoop prestressing force pipe and vertical prestressing force reinforced structure, servo formula automatic control device includes intelligent monitoring unit and intelligent regulation unit, the intelligent monitoring unit is used for real-time supervision tunnel parameter, the intelligent regulation unit is according to the tunnel parameter of monitoring, through the horizontal and fore-and-aft dynamic data of deformation accommodation process of integrated analysis, combines the vertical and horizontal mechanics interact relation, carries out dynamic adjustment to vertical and horizontal prestressing force.
Further, shield tunnel hoop prestressing force pipe is including setting up the hollow bellows in stiff end section of jurisdiction and junction section of jurisdiction hoop steel reinforcement cage, wear to establish hoop prestressing steel strand in the bellows, hoop prestressing steel strand adopts the form of two circles prestressing tendons, stretch out after hoop prestressing steel strand penetrates from section of jurisdiction inner wall pore, hoop prestressing steel strand's both ends are connected with prestressing tendon anchor respectively.
Furthermore, the prestressed tendon anchoring device comprises a trapezoidal shell, two side walls of the trapezoidal shell are respectively provided with a notch, the notch on one side wall is connected with the fixed end anchorage, and the notch on the other side wall is connected with the tensioning end anchorage.
Further, vertical prestressing force reinforced structure includes stiff end section of jurisdiction, interval section of jurisdiction and the junction section of jurisdiction that is connected by vertical prestressing force steel strand wires, stiff end section of jurisdiction and junction section of jurisdiction are connected by first standard block, first adjacent joint piece, first block connect gradually and constitute the lining cutting ring structure, first standard block, first adjacent joint piece, first block all offer flutedly along the both ends of vertical direction, the both ends of vertical prestressing force steel strand wires are fixed through steel strand wires tool to lock at the groove position.
Further, the interval section of jurisdiction is connected by second standard block, second adjacent block, second block of capping and is constituteed, second standard block, second adjacent block, second block of capping connect gradually and constitute the lining ring structure, the hole that is used for wearing to establish vertical prestressing force steel strand is offered at the middle part of interval section of jurisdiction.
Further, the both ends face of stiff end section of jurisdiction and junction section of jurisdiction along longitudinal direction cooperates respectively and is provided with the stress transmission board, be connected through the reinforcing bar between the stress transmission board, the hole that is used for wearing to establish vertical prestressing force steel strand is seted up at the stress transmission board middle part.
Further, the intelligent monitoring unit includes monitoring facilities and the information transmission equipment who connects thereof, information transmission equipment is connected to the intelligent regulation unit, monitoring facilities is including the laser scanner that is used for measuring vault and sinks, horizontal convergence and peripheral displacement for measure the meter of section of jurisdiction volume of opening, be used for measuring the pressure cell of terminal surface pressure, be used for measuring the steel cable dynamometer of steel strand wires pulling force and be used for measuring the bar meter of section of jurisdiction stress strain.
Furthermore, the intelligent adjusting unit comprises a data analysis module and an automatic control subsystem connected with the data analysis module, wherein the data analysis module is used for analyzing monitoring parameters, comprehensively analyzing dynamic data in the transverse and longitudinal deformation adjusting processes, and comprehensively adjusting the longitudinal and transverse dynamic adjustment according to the longitudinal and transverse mechanical interaction relation;
and the automatic control subsystem correspondingly controls the tension of the anchorage device at the tensioning end according to the signal output by the data analysis module.
Further, the longitudinal-transverse mechanical interaction relationship specifically uses all transverse influence factors influencing the longitudinal mechanical performance of the tunnel as evaluation indexes to form a multi-factor interaction relationship matrix, so as to quantitatively calculate the longitudinal mechanical parameters of the tunnel, and the composition principle of the relationship matrix is as follows: the method comprises the following steps of sequentially placing transverse influence factors on a main diagonal of a matrix, wherein the value of each influence factor represents the specific influence degree of longitudinal mechanical property change caused by the action of the influence factor, and if the action of a certain influence factor and other influence factors is placed at other positions except the main diagonal of a row where the certain influence factor is located, the value of the influence factor represents the specific influence degree of longitudinal mechanical property change caused by the interaction between the certain influence factor and other influence factors, and the relationship matrix is as follows:
wherein, V i,i Is the ith transverse influence factor, V i,j The influence on the longitudinal mechanical property of the tunnel caused by the action of the transverse influence factor i on the influence factor j, V j,i The transverse influence factor i is influenced by the influence factor j on the longitudinal mechanical property of the tunnel, delta p 、δ c Respectively longitudinal and circumferential opening, F p 、F c Respectively longitudinal and circumferential prestress, K p To longitudinal curvature, D c For horizontal convergence, σ p 、σ c Respectively longitudinal and circumferential lining internal forces, P p 、P c Respectively longitudinal and circumferential end face pressures;
the specific process of the dynamic adjustment is as follows: firstly, analyzing the change rate and the absolute value of longitudinal opening and transverse opening, if the change rate or the absolute value of the longitudinal opening is greater than a preset longitudinal control value, preferentially carrying out graded adjustment on longitudinal prestress, and analyzing each monitoring value while carrying out each grade of adjustment; if the annular monitoring values tend to be more dangerous or the longitudinal opening amount cannot be adjusted, the annular prestress is adjusted in a grading mode according to the longitudinal and transverse mechanical interaction relation, finally, the change rate and the absolute value of the longitudinal and transverse opening are close to an ideal state, and each monitoring value is within a control range; if the state cannot be adjusted to the ideal state, the controller sends out an alarm to remedy through manual measures;
if the change rate or absolute value of the transverse opening is larger than the preset transverse control value, the same is true.
Furthermore, the automatic control subsystem comprises a reaction frame and a miniature hydraulic jack which are arranged at the position of the anchor at the tensioning end, the miniature hydraulic jack is connected to the intelligent control module through a distributed motor, the intelligent control module is connected with the data analysis module, and the intelligent control module is installed on the inner side of the duct piece.
Compared with the prior art, the invention has the advantages that the circumferential prestressed pipe and the longitudinal prestressed reinforcing structure of the shield tunnel are arranged, wherein the circumferential prestressed pipe is connected into a whole in the circumferential direction, so that the convergence deformation of the pipe piece ring can be limited, and the integral strength of the shield tunnel pipe piece is improved; the longitudinal prestress reinforced structure is connected into a whole in the longitudinal direction, so that the defect of uneven stress of a local segment can be overcome, uneven settlement can be controlled more favorably, longitudinal distortion of the tunnel is limited, and the overall strength of the shield tunnel segment is improved.
The intelligent monitoring unit and the intelligent adjusting unit are arranged, so that the tunnel data can be automatically monitored in real time, the longitudinal and transverse prestress of the tunnel can be dynamically adjusted by analyzing the longitudinal and transverse interaction relation of the tunnel, the condition that the longitudinal parameters meet the conditions and the transverse parameters exceed the control values is avoided, in addition, the micro hydraulic jack, the pressure frame and the distributed motor are arranged in the intelligent adjusting unit, the pretensioning force of the steel strands between each connecting section in the shield tunnel can be intelligently adjusted conveniently and reliably, the longitudinal circumferential rigidity of the tunnel is enhanced, the longitudinal prestress loss of the shield tunnel is compensated, and the aims of relieving or even eliminating the tunnel joint deformation and longitudinal uneven settlement are fulfilled.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
FIG. 2 is a schematic view of a first segment A at the fixed end or joint;
FIG. 3 is a schematic view of a first abutting block A and a first standard block A of a tube sheet at a fixed end or a joint;
FIG. 4 is a schematic view of a second segment B;
fig. 5 is a schematic diagram of a second adjacent block B and a second standard block B of a segment pipe;
FIG. 6 is a schematic structural view of the anchoring device for circumferential pre-stressed tendons;
FIG. 7 is a schematic view of a segment ring at the fixed end or joint;
FIG. 8 is a schematic view of an inter-segment tube sheet ring;
FIG. 9 is a schematic view showing the connection of a fixed end segment, an interval segment and a joint segment;
FIG. 10 is a schematic view of a tunnel monitoring section installation;
FIG. 11 is a schematic flow chart of intelligent monitoring and dynamic adjustment of tunnels;
the notation in the figure is: 1. a first capping block; 2. a stress transfer plate; 3. the middle part of the stress transfer plate is used for penetrating a hole of the longitudinal prestressed steel strand; 4. a groove; 5. a hollow bellows; 6. reinforcing steel bars; 7. a first contiguous block or a first standard block; 8. a second capping block; 9. the middle part of the interval duct piece is used for penetrating a hole of the longitudinal prestressed steel strand; 10. a second adjoining block or a second standard block; 11. duct of inner wall of the duct piece; 12. a trapezoidal housing; 13. a support steel plate of the trapezoidal shell; 14. a notch; 15. circumferential prestress steel strands; 16. longitudinal prestress steel strands; 17. a joint meter; 18. a pressure cell; 19. a reaction frame; 20. a micro hydraulic jack; 21. a distributed electric motor; 22. a force gauge; 23. measuring a reinforcing steel bar; 24. a laser scanner; 25. a wireless signal station; 26. and (4) a computer.
Detailed Description
The invention is described in detail below with reference to the figures and the specific embodiments.
Examples
As shown in fig. 1 to 10, a longitudinal and transverse servo-type prestress automatic control system for a segment tunnel comprises a prestressed steel cable tension part and a servo-type automatic control device, wherein the prestressed steel cable tension part comprises a shield tunnel circumferential prestressed pipe and a longitudinal prestress reinforcing structure; the servo type automatic control device comprises an intelligent monitoring unit and an intelligent adjusting unit.
Specifically, the circumferential prestressed pipe of the shield tunnel is characterized in that a hollow corrugated pipe 5 is added into a circumferential reinforcement cage of a pipe piece at the fixed end and the connecting part, a circumferential prestressed steel strand 15 is arranged in the hollow corrugated pipe 5, a double-ring prestressed reinforcement form is adopted, and two ends of the circumferential prestressed steel strand 15 steel strand respectively extend out of a hole passage 11 in the inner wall of the pipe piece and are connected with a prestressed reinforcement anchoring device fixed on the pipe piece;
the pre-buried steel plate of the prestressed reinforcement anchoring device is provided with a welding groove, the pre-welded reinforcement of the pre-buried steel plate faces downwards and is connected with the inside of the prestressed pipe into a whole, notches 14 are formed in two side walls of a trapezoidal shell 12 connected to the pre-buried steel plate, the notch 14 in one side wall is connected with a fixed end anchorage device, and the notch 14 in the other side wall is connected with a tensioning end anchorage device.
In the longitudinal prestress reinforcing structure, a fixed end segment, an interval segment and a connecting segment are connected by a longitudinal prestress steel strand 16, and the end part of a segment groove 4 is fixed by a steel strand lock;
stiff end section of jurisdiction and junction section of jurisdiction are connected by first top seal piece A, first adjacent block A and standard block A and are constituteed, and first adjacent block A is connected with first top seal piece A, first standard block A is connected with first adjacent block A, and the three is connected and is constituteed the lining cutting ring structure, and both ends all open along longitudinal direction have the recess 4 of reserving.
In addition, the two end faces of the fixed end pipe piece and the connecting part pipe piece in the longitudinal direction are matched with stress transfer plates 2, the stress transfer plates 2 are connected through reinforcing steel bars 6, and the middle of each stress transfer plate 2 is provided with a hole 3 for penetrating through a longitudinal prestress steel strand 16.
The interval segment is formed by connecting a second top sealing block B, a second adjacent block B and a second standard block B, the second adjacent block B is connected with the second top sealing block B, the second standard block B is connected with the second adjacent block B, the second standard block B and the second adjacent block B are connected to form a lining ring structure, and the middle of each interval segment block is provided with a hole 9 for penetrating through a longitudinal prestress steel strand 16.
The intelligent monitoring unit includes monitoring facilities and information transmission equipment, and monitoring facilities is used for monitoring the important parameter in the tunnel, includes: the method comprises the following steps that a laser scanner 24 monitors vault sinking, horizontal convergence and peripheral displacement, a joint meter 17 monitors the opening amount of a duct piece, a pressure box 18 monitors end face pressure, a steel cable dynamometer 22 monitors steel strand tension and a steel bar meter 23 monitors the internal strain stress of the duct piece, and in the embodiment, the laser scanner 24 is arranged at the position of a tunnel side wall; the joint meter 17, the pressure box 18 and the reinforcing steel bar meter 23 are pre-embedded under the primary concrete; the wire rope load cells 22 are mounted on the prestressed steel strands (15 and 16), and each transmit monitoring data to the computer 26 via an information transmission device (wireless signal station 25).
The intelligent regulation unit includes data analysis module and automatic control subsystem, data analysis module includes data storage module and data display module, be used for carrying out the analysis to the monitoring parameter, the horizontal and vertical deformation accommodation process's of integrated analysis dynamic data, according to indulge horizontal mechanics interact, overall planning carries out dynamic adjustment to indulging transversely, wherein, indulge horizontal mechanics interact, specifically be with all horizontal influence factors that influence the vertical mechanical properties of tunnel as the evaluation index, can constitute a multifactor interaction relation matrix, come the vertical mechanical parameters of quantitative calculation tunnel, the constitution principle of relation matrix is: the transverse influence factors are sequentially placed on the main diagonal line of the matrix (the front and back orders among the transverse influence factors can be mutually replaced), and the value of each influence factor represents the specific influence degree of the longitudinal mechanical property change caused by the action of the influence factor; the effect of a certain influencing factor on other influencing factors is placed at a position other than the main diagonal of the row in which the factor is located, and the value of the effect represents the specific degree of influence of the longitudinal mechanical property change caused by the interaction between the influencing factor and other influencing factors. The specific matrix is composed of:
in this relationship matrix, V i,i Denotes the ith transverse influence factor, V i,j Represents the influence of the transverse influence factor i on the influence factor j on the longitudinal mechanical property of the tunnel, V j,i The influence of the transverse influence factor i on the longitudinal mechanical property of the tunnel by the influence factor j is shown. Delta. for the preparation of a coating p 、δ c Showing the amount of longitudinal and circumferential opening, F p 、F c Denotes longitudinal, circumferential prestress, K p Denotes the longitudinal curvature, D c Indicates horizontal convergence, σ p 、σ c Indicating the internal force, P, of the longitudinal and circumferential linings p 、P c Indicating the longitudinal, hoop end face pressure.
The dynamic adjustment process is as shown in fig. 11, first analyzing the change rate and the absolute magnitude of longitudinal and circumferential opening, if the change rate or the absolute magnitude of longitudinal opening is greater than the control value, preferentially adjusting the longitudinal prestress in stages, and analyzing each monitoring value while adjusting each stage, if the circumferential monitoring value tends to be more dangerous or the longitudinal opening is found to be unable to be adjusted, the circumferential prestress is adjusted in stages according to the interaction relationship of longitudinal and transverse mechanics, and finally both approach to an ideal state, each monitoring value is within the control range, if the circumferential monitoring value is unable to be adjusted to the ideal state, the controller will give an alarm, remedying by manual measures, if the change rate or the absolute magnitude of transverse opening (i.e. circumferential opening) is greater than the control value, the corresponding adjustment is similarly performed.
The automatic control subsystem comprises a micro hydraulic jack 20 and a reaction frame 19 and is connected with an intelligent control module arranged on the inner side of the pipe piece, the intelligent control module judges through receiving signals transmitted by a data analysis module, and the distributed electric motor 21 is used for remotely controlling the expansion and contraction of the micro hydraulic jack 20 so as to realize the automatic adjustment of the tension end anchorage device tension.
The system is applied to practice, and the specific construction and application process comprises the following steps:
1) as shown in fig. 7, the fixed end annular prestressed pipe pieces are connected through the tenon-and-mortise joints, and the hollow corrugated pipes 5 are butted to form an annular channel accurately;
2) as shown in fig. 6, a prestressed bar anchoring device is fixed on the first standard block 7 at the fixed end, two circumferential prestressed steel strands 15 penetrate into the hollow corrugated pipe 5 from the duct piece inner wall duct 11 and then penetrate out from the duct piece inner wall duct 11, and two ends of the circumferential prestressed steel strands 15 are respectively introduced into notches 14 on two side walls of the trapezoidal shell 12;
3) one end of the annular prestressed steel strand 15 is connected with a fixed end anchorage device, the other end of the annular prestressed steel strand is connected with a tensioning end anchorage device, a reaction frame 19 and a miniature hydraulic jack 20 are arranged at the tensioning end anchorage device, the jack 20 is controlled by an electric motor 21 through an intelligent control module to perform tensioning, and the tensioning is stopped when a preset stress is reached;
4) as shown in fig. 8, the segment pipe ring segments are connected through the tenon-and-mortise joints, and the corrugated pipes 5 are butted to accurately form an annular channel;
5) as shown in fig. 9, the longitudinal prestressed steel strand 16 passes through the hole 3 in the middle of the stress transfer plate 2 on one side of the fixed end segment, and one end of the longitudinal prestressed steel strand 16 is locked in the corresponding segment preformed groove 4 on the fixed end segment;
6) the prestressed steel strands 16 penetrate through the duct piece pore channels 9 of the multiple groups of interval segments along the longitudinal direction;
7) the circumferential prestressed pipe pieces at the connecting positions are connected through concave-convex tenon joints, and the corrugated pipes 5 are butted to form an annular channel accurately;
8) a prestressed rib anchoring device is fixed on a first standard block 7 at the joint, two annular prestressed steel strands 15 penetrate into the hollow corrugated pipe 5 from a duct piece inner wall duct 11 and then penetrate out from the duct piece inner wall duct 11, and two ends of the annular prestressed steel strands 15 are respectively introduced into notches 14 on two side walls of the trapezoidal shell 12;
9) one end of the annular prestressed steel strand 15 is connected with a fixed end anchorage device, the other end of the annular prestressed steel strand is connected with a tensioning end anchorage device, a reaction frame 19 and a miniature hydraulic jack 20 are arranged at the tensioning end anchorage device, the jack 20 is controlled by an electric motor 21 through an intelligent control module to perform tensioning, and the tensioning is stopped when a preset stress is reached;
10) the first group of longitudinal prestressed steel strands 16 penetrate through the holes 3 on the stress transfer plate 2 on one side of the segment at the joint through the segment duct 9, and the other ends of the longitudinal prestressed steel strands 16 are locked in the corresponding segment preformed grooves 4 on the segment at the joint;
11) as shown in fig. 10, a reaction frame 19 and a micro hydraulic jack 20 are arranged at the anchorage device at the tensioning end of the fixed end segment, the jack 20 is controlled by an intelligent control module through an electric motor 21 to perform tensioning, and the tensioning is stopped when a preset stress is reached, so that a prestress is applied to the connecting piece of the longitudinal prestress steel strand 16, and the longitudinal prestress is fixed by the reaction frame 19;
12) a group of longitudinal prestressed steel strands 16 is newly arranged along the longitudinal direction and penetrates through the holes 3 on the stress transfer plate 2 on the other side of the segment at the joint, and one end of each longitudinal prestressed steel strand 16 is locked in the corresponding segment reserved groove 4 on the segment at the joint end;
13) repeating the steps 6) to 12), finishing prestress application of the whole prestress reinforcing structure by adopting a non-bonding method, and grouting the end parts of the pipe sheet pore passages;
14) in the segment splicing process, the laser scanner 24 is arranged at the side wall position of a tunnel, the pressure box 18 is buried in the annular joint and the longitudinal joint of the segment, the joint measuring meters 17 are installed on the side of the annular joint and the longitudinal joint, the dynamometer 22 is inserted into a steel strand, the reinforcing steel bar meter 23 is buried in the lining, the proper position is selected for measuring point arrangement according to the tunnel construction site and the monitoring measuring working scheme, and the data acquisition module is utilized for monitoring the mechanical deformation parameters of the tunnel.
15) And in the subsequent construction and operation stages, the change rate and the maximum value of all the parameters are analyzed and warning values are set through a data analysis module. The dynamic data of the horizontal and longitudinal deformation adjustment processes are comprehensively analyzed, the jacks 20 are controlled through the electric motors 21 arranged in the longitudinal and transverse directions to dynamically adjust the longitudinal and transverse prestress according to the longitudinal and transverse mechanical interaction relation, finally, all monitoring values are enabled to be within a control range, if the monitoring values cannot be adjusted to an ideal state, the controller can give an alarm, and the remediation is carried out through manual measures.
Specifically, a control value is set for a servo automatic control device, prestress is applied to an initial target value, servo control is started after segment assembling and prestress tensioning are completed, when a certain measurement value corresponding to each initial prestress of a first group exceeds the control value, a micro jack 20 is used for longitudinal steel strand prestress loosening or tensioning, the control target value is changed, then the next group of steel strands is installed, the size relation between the measurement value and the control value of the group and the previous groups is judged again, finally, when the prestress reaches an alert value, the measurement value is not controlled, and then manual overhaul and reinforcement are required to be performed by an operation unit for alarming.
In conclusion, the prestressed steel cable tensioning part is designed in the technical scheme, the jacks are controlled to tension steel strands to squeeze the duct piece tightly in the longitudinal direction and the circumferential direction of the duct piece through the electric motors, so that not only can the longitudinal and transverse joints of the tunnel duct piece be controlled to be opened, but also the longitudinal uneven settlement of the tunnel and the convergence deformation of the duct piece ring can be controlled; according to the technical scheme, the servo type automatic control device is designed, on one hand, the longitudinal and transverse stress deformation of the prestressed steel cable and the segment tunnel is monitored in real time through the seam-measuring and force-measuring sensing devices, on the other hand, the servo control of the prestressed steel cable tensioning is established based on the longitudinal and transverse interaction mechanism of the tunnel, so that the longitudinal and circumferential prestress is synchronously adjusted through data real-time feedback, and the problems of tunnel seam opening, leakage, longitudinal deflection deformation, segment ring convergence deformation and the like are effectively controlled.
In the technical scheme, the annular prestressed pipe and the longitudinal prestressed reinforcing structure can save a large number of metal parts assembled by the pipe pieces, save labor, shorten the construction period, control the crack of concrete, ensure the water stopping performance of the tunnel and improve the strength.
According to the technical scheme, the annular prestressed pipes are connected into a whole in the annular direction, so that the convergence deformation of the pipe piece ring is limited, and the overall strength of the shield tunnel pipe piece is improved; the longitudinal prestress reinforced structure is connected into a whole in the longitudinal direction, so that the defect of uneven stress of a local segment is overcome, uneven settlement is more favorably controlled, longitudinal distortion of the tunnel is limited, and the overall strength of the shield tunnel segment is improved.
According to the technical scheme, the shield segments are extruded, so that the segments are mainly mutually extruded, the tunnel joint is controlled to be opened, the anti-permeability capability of the joint is improved, and the water seepage and mud leakage phenomena of the tunnel are effectively controlled;
through setting up the stress transmission board, pass through the steel bar connection with the stress transmission board at both ends, can conveniently set up electric motor, reaction frame and miniature hydraulic jack more in the recess, the construction of being convenient for.
According to the technical scheme, the tunnel automatic monitoring and measuring system based on the Internet of things transmits data in each monitoring sensor to the central computer, and 24-hour automatic monitoring can be realized. The data analysis module considers the longitudinal and transverse interaction relation of the tunnel, accords with the actual situation, can adjust the longitudinal and annular prestress more reasonably, and avoids the situation that the longitudinal parameters meet the conditions and the transverse parameters exceed the control values.
According to the technical scheme, the electric motor drives the miniature hydraulic jack to easily realize reinforcement of the circumferential prestress pipe and the longitudinal prestress, intelligent adjustment of the pretensioning force of the steel strands between the connecting sections in the shield tunnel is realized, and the method is simple and easy to operate;
the control parameters of the prestress are adjusted through the servo control device, real-time control over the tunnel can be achieved, time and labor cost are saved, monitoring values are analyzed through adjusting the parameters, and the optimal solution can be output and controlled, so that powerful data support is provided for follow-up engineering research regularity.
Claims (10)
1. The utility model provides a section of jurisdiction tunnel is indulged horizontal servo formula prestressing force automatic control system, a serial communication port, including prestressing cable stretch-draw portion and the servo formula automatic control device who connects, prestressing cable stretch-draw portion includes shield tunnel hoop prestressing force pipe and vertical prestressing force reinforced structure, servo formula automatic control device includes intelligent monitoring unit and intelligent regulation unit, the intelligent monitoring unit is used for real-time supervision tunnel parameter, the intelligent regulation unit is according to the tunnel parameter of monitoring, through the horizontal and vertical dynamic data who warp accommodation process of integrated analysis, combines to indulge horizontal mechanics interact relation, carries out dynamic adjustment to indulging horizontal prestressing force.
2. The automatic control system of longitudinal and transverse servo type prestress of segment tunnel according to claim 1, characterized in that, the shield tunnel hoop prestress pipe comprises a hollow corrugated pipe (5) arranged in a fixed end segment and a joint segment hoop reinforcement (6) cage, hoop prestress steel strands (15) are arranged in the corrugated pipe (5) in a penetrating mode, the hoop prestress steel strands (15) adopt a double-ring prestress rib form, the hoop prestress steel strands (15) stretch out after penetrating from a segment inner wall pore passage (11), and two ends of the hoop prestress steel strands (15) are respectively connected with a prestress rib anchoring device.
3. The automatic control system of the longitudinal and transverse servo type prestress of the pipe piece tunnel according to claim 2, wherein the prestress rib anchoring device comprises a trapezoid shell (12), two side walls of the trapezoid shell (12) are respectively provided with a notch (14), the notch (14) on one side wall is connected with a fixed end anchorage, and the notch (14) on the other side wall is connected with a tensile end anchorage.
4. The automatic control system of longitudinal and transverse servo type prestress of a segment tunnel according to claim 3, wherein the longitudinal prestress reinforcement structure comprises a fixed end segment, an interval segment and a joint segment which are connected by longitudinal prestress steel strands (16), the fixed end segment and the joint segment are connected by a first standard block, a first abutting block and a first capping block, the first standard block, the first abutting block and the first capping block are sequentially connected to form a lining ring structure, grooves (4) are formed in the two ends of the first standard block, the first abutting block and the first capping block in the longitudinal direction, and the two ends of the longitudinal prestress steel strands (16) are fixed at the positions of the grooves (4) through steel strand locks.
5. The automatic control system of longitudinal and transverse servo type prestress of a segment tunnel according to claim 4, wherein the segment is formed by connecting a second standard block, a second adjacent block and a second capping block, the second standard block, the second adjacent block and the second capping block are sequentially connected to form a lining ring structure, and a hole (9) for penetrating a longitudinal prestress steel strand (16) is formed in the middle of the segment.
6. The automatic longitudinal and transverse servo type prestress control system for the pipe piece tunnel according to claim 4, wherein two end faces of the fixed end pipe piece and the connecting part pipe piece in the longitudinal direction are respectively provided with a stress transfer plate (2) in a matching mode, the stress transfer plates (2) are connected through a steel bar (6), and a hole (3) for penetrating through a longitudinal prestress steel strand (16) is formed in the middle of each stress transfer plate (2).
7. The automatic control system of pipe piece tunnel longitudinal and transverse servo type prestress, according to claim 4, is characterized in that said intelligent monitoring unit comprises a monitoring device and an information transmission device connected with the monitoring device, said information transmission device is connected to the intelligent adjusting unit, said monitoring device comprises a laser scanner (24) for measuring vault sag, horizontal convergence and peripheral displacement, a slit meter (17) for measuring the opening amount of the pipe piece, a pressure box (18) for measuring end face pressure, a wire rope dynamometer (22) for measuring the tension of steel strand and a steel bar meter (23) for measuring the stress strain of the pipe piece.
8. The automatic control system of longitudinal and transverse servo type prestress of a pipe sheet tunnel according to claim 7, wherein the intelligent adjusting unit comprises a data analyzing module and an automatic control subsystem connected with the data analyzing module, the data analyzing module is used for analyzing monitoring parameters, comprehensively analyzing dynamic data of transverse and longitudinal deformation adjusting processes, and comprehensively adjusting the longitudinal and transverse dynamic according to longitudinal and transverse mechanical interaction relation;
and the automatic control subsystem correspondingly controls the tension of the anchorage device at the tensioning end according to the signal output by the data analysis module.
9. The system of claim 8, wherein the longitudinal-transverse mechanical interaction relationship is a multi-factor interaction relationship matrix formed by using all transverse influence factors influencing the longitudinal mechanical property of the tunnel as evaluation indexes, so as to quantitatively calculate the longitudinal mechanical parameters of the tunnel, and the relationship matrix is formed by: sequentially placing transverse influence factors on a main diagonal of the matrix, wherein the value of each influence factor represents the specific influence degree of longitudinal mechanical property change caused by the action of the influence factor, and if the action of a certain influence factor and other influence factors is placed at other positions in a row of the factor except the main diagonal, the value of the influence factor represents the specific influence degree of longitudinal mechanical property change caused by the interaction between the influence factor and other influence factors, and the relationship matrix is as follows:
wherein, V i,i Is the ith transverse influence factor, V i,j The influence on the longitudinal mechanical property of the tunnel caused by the action of the transverse influence factor i on the influence factor j, V j,i The transverse influence factor i is influenced by the influence factor j on the longitudinal mechanical property of the tunnel, delta p 、δ c Respectively longitudinal and circumferential opening, F p 、F c Respectively longitudinal and circumferential prestress, K p To longitudinal curvature, D c For horizontal convergence, σ p 、σ c Internal forces, P, of longitudinal and circumferential linings, respectively p 、P c Longitudinal and circumferential end face pressures are respectively;
the specific process of the dynamic adjustment is as follows: firstly, analyzing the change rate and the absolute value of longitudinal opening and transverse opening, if the change rate or the absolute value of the longitudinal opening is greater than a preset longitudinal control value, preferentially carrying out graded adjustment on longitudinal prestress, and analyzing each monitoring value while carrying out each grade of adjustment; if the annular monitoring values tend to be more dangerous or the longitudinal opening amount cannot be adjusted, the annular prestress is adjusted in a grading mode according to the longitudinal and transverse mechanical interaction relation, finally, the change rate and the absolute value of the longitudinal and transverse opening are close to an ideal state, and each monitoring value is within a control range; if the state cannot be adjusted to the ideal state, the controller sends out an alarm to remedy through manual measures;
if the change rate or the absolute value of the transverse opening is larger than the preset transverse control value, the same is true.
10. The automatic control system for longitudinal and transverse servo type prestress of a pipe piece tunnel according to claim 8, wherein the automatic control subsystem comprises a reaction frame (19) and a micro hydraulic jack (20) which are arranged at the position of an anchorage device at a tensioning end, the micro hydraulic jack (20) is connected to an intelligent control module through a distributed motor (21), the intelligent control module is connected with a data analysis module, and the intelligent control module is installed on the inner side of the pipe piece.
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| CN116792149A (en) * | 2023-08-16 | 2023-09-22 | 湖南大学 | Method and system for recovering deformation of shield tunnel structure |
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