Urban water supply pipe network super-long distance pipe jacking construction method

Abstract

The application discloses a kind of urban water supply pipe network super-long distance pipe jacking construction methods, it is related to urban underground engineering construction technical field, comprising the following steps: S1, before construction in starting well, continuous pressure sensing mat layer is laid in the bottom of counter thrust frame, the push force size, action time and push force change rhythm generated by each time jacking are recorded by pressure sensing unit, and push force rhythm spectrum is generated;S2, push force rhythm spectrum is superimposed on time axis with the settlement measuring line in the bottom of counter thrust frame, and the settlement sudden jump signal is extracted from the section corresponding to the peak value of push force, and the bearing fluctuation diagram of the bottom of counter thrust frame is formed.The application constructs the active regulation and control system based on push force sensing, support adjustment and three-way linkage control, realizes whole process dynamic regulation and control of pipe jacking posture, effectively resolves the risk of bottom pressure loss, improves construction precision and breakthrough success rate, and is suitable for complex geology and high-precision urban water supply pipe jacking engineering.

Description

Technical Field

[0001] This invention relates to the field of urban underground engineering construction technology, specifically to a method for ultra-long-distance pipe jacking construction of urban water supply networks. Background Technology

[0002] Long-distance pipe jacking construction for urban water supply networks refers to a trenchless, long-distance, directional tunneling underground construction method used in environments with limited underground space resources, complex road traffic, and unsuitable surface excavation conditions for laying large-diameter water supply pipelines. This method typically involves applying thrust to the soil ahead through a launching shaft, causing the pipe jacking machine to slowly advance along a predetermined path. Simultaneously, a guiding system controls the trajectory, allowing water supply pipe sections to be jacked in from the rear, enabling the pipeline to continuously advance over long underground distances. This completes the laying of the main water supply pipeline without damaging surface roads, demolishing surface buildings, or affecting existing municipal facilities. This method is suitable for crossing highly sensitive areas such as main roads, rivers, subway tunnels, and areas with dense underground pipelines, effectively reducing the risk of surface disturbance and improving the efficiency and safety of long-distance water supply network construction.

[0003] The existing technology has the following shortcomings:

[0004] In the construction of ultra-long-distance pipe jacking projects using existing technologies, when the pipe jacking machine enters a composite stratum consisting of soft plastic soil interspersed with hard lens-like structures, the stress conditions at the tunneling face change drastically within a short period. The soft plastic soil, after being compressed, rapidly decompresses, maintaining a low level of propulsion resistance. However, once the jacking head cuts into the hard lens-like structure, the local soil strength increases instantaneously, causing a sudden jump in propulsion resistance. This sudden jump in resistance leads to a rapid attitude deviation of the jacking head, resulting in a continuous biased pressure transition. If the jacking head continues to advance in this biased state, the tunneling trajectory will quickly deviate from the designed route. This deviation will be transmitted over long distances and continuously amplified, making it difficult for the pipeline to regain its correct attitude in subsequent sections. Once this deviation accumulates to an irreversible level, it will directly lead to the failure of the entire pipeline tunnel, thus posing significant risks of work stoppage, rework, and major safety hazards to the construction of long-distance water supply networks.

[0005] The information disclosed in the background section is only intended to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0006] The purpose of this invention is to provide a method for ultra-long-distance pipe jacking construction of urban water supply networks to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a method for ultra-long-distance pipe jacking construction of urban water supply networks, comprising the following steps:

[0008] S1, before the construction of the starting well, a continuous pressure-sensitive pad layer is laid at the bottom of the thrust reverser. The pressure-sensitive unit records the magnitude of the thrust generated by each jacking, the duration of action, and the rhythm of thrust changes, generating a thrust rhythm spectrum covering the entire construction process.

[0009] S2, superimpose the thrust rhythm spectrum on the time axis with the settlement measurement line at the bottom of the thrust reverser, extract the settlement jump signal from the section corresponding to the thrust peak, and form the bearing fluctuation map at the bottom of the thrust reverser;

[0010] S3, based on the load fluctuation diagram, divides the high-risk load area, embeds wedge-shaped support plates in the high-risk load area, and allows for stiffness fine adjustment through stroke adjustment. The wedge-shaped support plates absorb uneven stress during thrust changes, generating a support adjustment list containing the stroke adjustment parameters of each support plate.

[0011] S4, according to the support adjustment list, insert the bottom support pre-adjustment sequence into the jacking cycle, and use the bottom support pre-adjustment sequence to drive the wedge support plate to complete synchronous micro-lifting and synchronous micro-lowering operations in the corresponding cycle, transfer the predicted local pressure loss position to the controllable area, and generate a traction command series containing the phased adjustment requirements;

[0012] S5, based on the traction command series, controls the partitioned hydraulic traction wall set behind the thrust reverser. Through the phased pressure adjustment of each hydraulic chamber before and after the arrival of high-frequency thrust, the continuous pressure-sensitive pad, wedge-shaped support plate and partitioned hydraulic traction wall form a three-way linkage dynamic support field. In the dynamic support field, the tilting trend caused by the misalignment of the thrust rhythm is offset in real time, realizing the active dynamic control of the jacking thrust link.

[0013] Preferably, step S1 includes:

[0014] After the structural construction and site stability acceptance at the bottom of the thrust reverser frame are completed, a continuous pressure-sensitive pad layer is laid according to the outer contour of the thrust reverser frame foundation and the shape of the bottom contact area, and pressure-sensitive units are arranged at uniform intervals in the horizontal direction so that the pressure-sensitive units form a thrust sensing structure covering the bottom of the thrust reverser frame.

[0015] After the installation is completed, static pressure calibration is performed. Standard pressures of different levels are applied to each pressure-sensitive unit using a standard loading device, and the initial response curves are recorded to form a reference template for thrust identification.

[0016] During the pipe jacking process, high-frequency data is recorded for each pressure-sensing unit in continuous jacking cycles, and the jacking time and longitudinal displacement of the thrust reverser are recorded simultaneously to form thrust segments and construct thrust evolution sequences.

[0017] Based on the thrust evolution sequence, continuous time periods are divided according to the thrust length. The thrust data is then subjected to trend analysis and graphing to generate a thrust rhythm spectrum covering the entire process. The correspondence between the thrust rhythm spectrum and the spatial position of the bottom of the thrust reverser is then calibrated.

[0018] Preferably, after completing the graphical processing of the thrust rhythm spectrum, the thrust peak segment in the thrust rhythm spectrum is spatially mapped to the positioning number of each pressure-sensitive unit in the continuous pressure-sensitive pad layer, so that the time information of the thrust peak segment corresponds to the actual bearing position at the bottom. During the propulsion process, a rhythm update page is generated according to a fixed propulsion length to calibrate the average thrust, abnormal frequency and high-risk segment position, so as to improve the matching accuracy of subsequent support adjustment and attitude control.

[0019] Preferably, step S2 includes:

[0020] After the thrust rhythm spectrum is drawn, a continuous settlement measurement line is laid at the bottom of the thrust reverser frame, and a static load loading test is conducted through a multi-point continuous displacement sensor to form a settlement curve benchmark.

[0021] During the pipe jacking process, the longitudinal settlement data collected by the settlement survey line is synchronized with the thrust cycle in the thrust rhythm spectrum according to the time nodes, and the settlement drop data is marked on the time axis of the thrust rhythm spectrum.

[0022] After completing the synchronous superposition, the settlement jump signal in each propulsion cycle is identified, and spatial mapping is performed based on the spatial location corresponding to the jump signal and the channel number in the thrust rhythm spectrum to form a two-dimensional disturbance distribution map.

[0023] Based on the two-dimensional disturbance distribution map, the bottom region of the thrust reverser is graded according to the disturbance signal density, intensity and duration, and the thrust rhythm information and settlement response characteristics are integrated to form a bearing fluctuation map.

[0024] Preferably, the extraction of settlement jump signals is limited to identifying the rapid descent of settlement measuring points within a short period of time during the peak period of the thrust rhythm spectrum, and taking settlement measuring points whose rapid descent exceeds a preset change range as the source of the jump signal. In the spatial mapping process, only settlement measuring points consistent with the position of the thrust channel are selected to construct the bearing fluctuation diagram, so as to ensure that the spatial correspondence accuracy of the disturbance distribution in the bearing fluctuation diagram is consistent with the force change at the bottom of the reverse thrust frame.

[0025] Preferably, step S3 includes:

[0026] Based on the first-level fluctuation area and continuous disturbance section in the load-bearing fluctuation diagram, the boundary range of the high-risk load-bearing area is determined, and the dual positioning of the construction surface coordinates and the thrust rhythm spectrum channel number is completed. At the same time, the number and arrangement of wedge support plates are designed and the interlocking arrangement with the pressure-sensitive pad layer is completed.

[0027] After the wedge-shaped support plates are installed in the high-risk load-bearing area, the structural parameters of each support plate are calibrated. The stiffness adjustment characteristics are confirmed by the stroke adjustment structure of the upper and lower stacked inclined wedges, and the initial load response curve is recorded.

[0028] After completing the parameter calibration of the wedge support plate, the mechanical state of each high-risk bearing area in different propulsion cycles was superimposed and analyzed based on the thrust rhythm spectrum and bearing fluctuation diagram. The required lifting and lowering amounts of each support plate in different time periods, as well as the corresponding duration and recovery state, were calculated.

[0029] After calculating the stroke adjustment amount of each support plate, a support adjustment list is compiled using the advance mileage as an index. The adjustment start time, stroke height, maintenance time and load prediction level of each support plate are recorded to provide input data for the next stage of support pre-adjustment sequence.

[0030] Preferably, the formation of the support adjustment list further includes uniformly marking the spatial center point coordinates of each wedge support plate in the high-risk load-bearing area, and setting a corresponding adjustment priority for each wedge support plate according to the disturbance intensity level in the load fluctuation diagram, so that the wedge support plate with higher adjustment priority can obtain a more advanced stroke adjustment sequence in the propulsion cycle, thereby improving the overall response stability of the high-risk load-bearing area.

[0031] Preferably, step S4 includes:

[0032] Before the start of the propulsion phase, the adjustment parameters of each wedge support plate in the support adjustment list are used to connect with the propulsion cycle. The adjustment start time, stroke size, duration and recovery time of each support plate are integrated according to the propulsion time to form the bottom support pre-adjustment sequence.

[0033] After the bottom support pre-adjustment sequence is established, the wedge support plate is driven by the mechanical adjustment mechanism to perform synchronous micro-lifting and synchronous micro-lowering operations within the corresponding propulsion cycle, and the consistency of the action start time is maintained in the same support surface area to avoid sudden changes in local stiffness.

[0034] During the continuous execution of the pre-tuned sequence, the local pressure loss area identified in the original load fluctuation diagram is compensated by the lifting and lowering behavior of the wedge support plate, and the center of gravity of the load is redistributed by the slight lowering behavior of the support plate in the non-critical area to form the support response trajectory.

[0035] After the support response trajectory is formed, the traction command sequence is generated according to the propulsion cycle time point, and the cycle number, force deflection direction, pressure adjustment start time and maintenance time in the traction command sequence are used as the control basis for subsequent hydraulic traction wall execution.

[0036] Preferably, when the wedge support plate is driven by the mechanical adjustment mechanism to perform synchronous micro-lifting and synchronous micro-lowering operations, the lifting speed and stroke change of each support plate are graded and matched according to the thrust intensity of the corresponding cycle in the thrust rhythm spectrum, and automatically restored to the preset initial stroke position according to the support response trajectory after the action is completed, so as to ensure the rhythm consistency and mechanical stability of the bottom support pre-adjustment sequence in the continuous propulsion cycle.

[0037] Preferably, step S5 includes:

[0038] The space behind the thrust reverser is divided into zones according to the traction command sequence, and the layout and numbering of the hydraulic traction walls are confirmed. At the same time, an independent hydraulic chamber is set in each zone and the static pressure test of the hydraulic system is completed to ensure pressure stability under high-frequency working conditions.

[0039] Before the implementation of the advancement phase, the time nodes, pressure changes, maintenance time and recovery mechanism in the traction command series are allocated to the hydraulic traction wall partitions according to the advancement time axis and pre-adjustment sequence, and the response speed of the hydraulic chamber is controlled by the pressure regulation rate to achieve precise timing control.

[0040] During the phased execution of the traction command series, a closed-loop interaction mechanism is formed by the pressure output of the hydraulic traction wall, the lifting behavior of the wedge support plate, and the load response data of the continuous pressure-sensitive pad layer. A three-dimensional force support network is constructed during the propulsion cycle to stabilize the attitude of the thrust reverser.

[0041] After the dynamic support field enters continuous operation, the structural response data in each propulsion cycle is tracked, and a three-dimensional linkage response spectrum is generated by combining the wedge support plate stroke record and the hydraulic traction wall pressure adjustment behavior, so as to serve as the feedback basis and parameter optimization basis in the propulsion process.

[0042] The technical effects and advantages provided by the present invention in the above technical solution are as follows:

[0043] This invention establishes an active control system based on thrust data sensing, centered on dynamic support adjustment, and employing three-dimensional linkage control. This system can identify and respond to thrust rhythm changes in real time during jacking, accurately locate and mitigate the risk of localized pressure loss at the bottom of the thrust reverser, and achieve full-process, closed-loop dynamic control of the pipe jacking attitude. By organically coordinating the pressure-sensitive pad, wedge-shaped support plate, and zoned hydraulic traction wall, this method not only effectively suppresses the chain reaction of attitude deviation caused by thrust load pulsation but also breaks through the limitations of traditional construction methods that rely on experience-based adjustments and passive corrections. It achieves full-process control from data-driven mechanical identification to active support response and precise attitude correction, effectively improving the accuracy, safety, and one-time breakthrough success rate of ultra-long-distance pipe jacking construction. This system has significant application value for urban water supply network construction traversing complex geological conditions, sensitive surface environments, and requiring high-precision positioning. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0045] Figure 1 This is a flowchart of a method for constructing ultra-long-distance pipe jacking in urban water supply networks according to the present invention. Detailed Implementation

[0046] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, they are provided so that the description of this disclosure will be more complete and fully convey the concept of the exemplary embodiments to those skilled in the art.

[0047] This invention provides, for example Figure 1 The method for constructing ultra-long-distance pipe jacking in urban water supply networks, as shown, includes the following steps:

[0048] S1, before the construction of the starting well, a continuous pressure-sensitive pad layer is laid at the bottom of the thrust reverser. The pressure-sensitive unit records the magnitude of the thrust generated by each jacking, the duration of action, and the rhythm of thrust changes, generating a thrust rhythm spectrum covering the entire construction process.

[0049] Before commencing ultra-long-distance pipe jacking construction for urban water supply networks, to achieve full-process dynamic sensing of thrust changes during the jacking process, a thrust sensing foundation structure with precise response capabilities needs to be constructed at the bottom of the thrust reverser before the starting shaft construction. Based on this, a thrust rhythm spectrum is generated, providing data support and a basis for subsequent attitude control and dynamic support adjustments. The specific steps are as follows:

[0050] After the structural construction and site stability acceptance at the bottom of the thrust reverser frame are completed, a set of continuously pressure-sensitive pads with equal spacing are custom-laid according to the outer contour of the thrust reverser frame foundation and the shape of the bottom contact area. These pressure-sensitive pads are laid parallel to the thrust reverser frame's advancing direction longitudinally, and pressure-sensitive units are evenly arranged at 50 mm intervals laterally. Each pressure-sensitive unit has a resolution of no less than 0.01 MPa, capable of identifying minute force changes in the thrust reverser frame during the jacking process. Each pressure-sensitive channel is no less than 5 meters long to cover the minimum support contact surface of the entire thrust reverser frame foundation, and its depth does not exceed 150 mm to ensure that the integrity of the thrust reverser frame's load-bearing structure is not affected. All pressure-sensitive units are connected to the data acquisition box via wired connections to ensure stable and distortion-free signals during high-frequency sampling. After the entire pressure-sensitive pad system is installed, a static pressure calibration must be performed under non-load conditions. Using a standard loading device, standard pressures of 0.1 MPa, 0.2 MPa, and 0.3 MPa are applied to each pressure-sensitive unit, and the initial response curves are recorded to build a reference template for subsequent data identification.

[0051] After completing the static calibration of the pressure-sensitive pad, as the pipe jacking construction enters the advancement phase, each advancement operation is considered a complete thrust cycle. The system records data point-by-point for all units of the pressure-sensitive pad at a sampling frequency of no less than 5 times per second, and simultaneously records the duration of each advancement and the corresponding longitudinal displacement of the thrust reverser. Within each advancement cycle, the real-time response differences of each pressure-sensitive unit can clearly reflect the non-uniform distribution of force on the thrust reverser. For example, in a typical advancement cycle, if the average pressure of the front unit is 0.27 MPa, while the average pressure of the rear unit is only 0.18 MPa, it can be preliminarily judged that there is a local settlement or thrust shift trend in the current bottom support. After each cycle, the collected data is uniformly archived into a set of thrust segments, forming a set of mechanical characteristics under a certain advancement cycle, including indicators such as maximum thrust value, average thrust value, force center shift, and duration. After summarizing the data from multiple consecutive advancement cycles, a thrust evolution sequence across the time dimension will be formed to track the thrust change pattern and abnormal fluctuation characteristics.

[0052] Based on the thrust evolution sequence, a time-sequential partitioning mechanism is introduced to divide the entire construction process into adjacent and continuous time periods, for example, each 50-meter advance constitutes a construction segment, with each segment containing approximately 150 to 200 advance cycles. Within each segment, the thrust data is analyzed for trends to identify points of abnormal thrust increases and areas of sustained peak changes. For instance, if, during the advance to 430 to 470 meters, the system continuously records thrust peak values ​​exceeding 0.35 MPa for eight consecutive cycles, and the average value is significantly higher than the 0.22 MPa baseline value of the first 30 meters, this segment is marked as the thrust rhythm peak area. Subsequently, using the thrust-time curve as the horizontal axis and thrust intensity as the vertical axis, the thrust information of each construction segment is mapped to form a thrust rhythm spectrum. This spectrum not only reflects the average level of thrust force but also reveals key construction mechanics characteristics such as differences in intensity and rhythm during the advance process, abrupt changes in abnormal peaks, and the range of force center shifts. The thrust rhythm spectrum is plotted by continuously overlaying data blocks, spanning the entire construction cycle, and ultimately forming a dynamic thrust distribution map that covers the entire process vertically and decomposes each cycle horizontally.

[0053] Based on the generated thrust rhythm spectrum, to ensure the response accuracy of support adjustment and attitude control during subsequent construction, the rhythm spectrum data is mapped to the physical space at the bottom of the thrust reverser frame. Spatial calibration of the thrust data is achieved by mapping the peak thrust segments to the positioning numbers of each unit in the actual pressure-sensitive pad layer. For example, during the advance to 570-600 meters, if the rhythm spectrum shows an overlap between the inflection point of the sustained high-pressure area between channels 41 and 58 and the corresponding periodic settlement measurement curve, this area is designated as a Level 1 response area, requiring high dynamic support capacity in subsequent construction. Furthermore, to ensure the engineering readability of the rhythm spectrum, a rhythm update page should be generated periodically every 30 meters of advance distance. This page includes the average thrust, frequency of anomalies, peak growth rate, and a list of high-risk segments, numbered with timestamps to facilitate closed-loop control of subsequent support adjustment and hydraulic response operations in stages. Thus, through the deployment of continuous pressure-sensitive pads, multi-cycle thrust data acquisition, rhythm sequence construction, and spectrum calibration, the entire process of thrust rhythm spectrum formation was completed, providing an accurate, continuous, and visualized data foundation for the next stage of settlement analysis and dynamic support construction.

[0054] S2, superimpose the thrust rhythm spectrum on the time axis with the settlement measurement line at the bottom of the thrust reverser, extract the settlement jump signal from the section corresponding to the thrust peak, and form the bearing fluctuation map at the bottom of the thrust reverser;

[0055] To achieve coordinated identification of the stress state and support settlement changes at the bottom of the thrust reverser during propulsion, after constructing the thrust rhythm spectrum, it is necessary to align and overlay the thrust rhythm spectrum with the settlement measurement lines at the bottom of the thrust reverser on the time axis. This allows for the extraction of settlement jump signals and the construction of a load-bearing fluctuation map, providing a high-precision basis for subsequent support adjustment area delineation. The specific implementation steps are as follows:

[0056] After completing the thrust rhythm spectrum mapping and calibrating the peak thrust range for each propulsion cycle, a full-coverage settlement measurement line needs to be installed at the bottom of the thrust reverser frame. High-precision multi-point continuous displacement sensors are deployed at the longitudinal and transverse intersections of the contact surface between the bottom of the thrust reverser frame and the foundation. Six measurement lines are arranged longitudinally along the pipe jacking direction, with a transverse spacing of 100 mm. Each measurement line is equipped with 20 position sensor nodes, each with a resolution of no less than 0.01 mm, and a sampling frequency of 3 times per second. All sensor nodes adopt a physical contact structure to ensure timely settlement response and accurate signals. After deployment, three rounds of static load tests are conducted, with load levels of 1 ton, 2 tons, and 3 tons, corresponding to a loading time of 30 seconds. The settlement curve trend is recorded, and sensor nodes with error drift are eliminated to ensure the comparability and accuracy of subsequent settlement data.

[0057] During the pipe jacking construction process, the longitudinal settlement data collected by the settlement survey line is strictly synchronized and matched with the advance time period recorded in the thrust rhythm spectrum, with each advance cycle as the unit. The matching process adopts a timestamp alignment strategy, that is, each settlement data point is matched one-to-one with the cycle node in the thrust rhythm spectrum according to the second-level time node. For example, when advancing to 280 meters to 300 meters, within the corresponding 74th to 81st cycles, if the thrust rhythm spectrum records a peak of 0.34 MPa in the 76th cycle, lasting for 12 seconds, and the 9th and 10th sensor nodes of the 3rd longitudinal survey line in the settlement survey line experience rapid drops of 0.87 mm and 0.92 mm respectively in this cycle, far exceeding the fluctuation range of 0.05 mm to 0.08 mm in the previous cycle, then this settlement data is marked as a target signal and inserted into the thrust spectrum axis with a red marker. After the alignment is completed, the entire settlement data will be distributed in the thrust rhythm spectrum along the time axis, realizing the dual data fusion of mechanical load changes and physical settlement response.

[0058] After achieving synchronous overlay of the thrust rhythm spectrum and settlement measurement lines, feature identification and spatial mapping operations are performed on the settlement jump signals in the matching cycle. Specifically, firstly, the instantaneous change rate of each settlement measurement point within each cycle is calculated, and nodes with a change exceeding 0.6 mm within 5 seconds are extracted as jump signal sources. Secondly, based on the spatial location of the bottom of the thrust reverser frame corresponding to these jump signal points, spatial mapping is performed with the channel number where the peak value appears in the thrust rhythm spectrum. For example, if the settlement jump node in cycle 76 is located at point 10 on measurement line 3, and the corresponding thrust channel is channel 12, then this point is designated as a key observation area and marked as a Level I bearing disturbance source. After completing this spatial mapping over multiple cycles, all settlement jump points can be attached to the periodic structure of the thrust rhythm spectrum, forming a two-dimensional disturbance distribution map with the thrust channel horizontally and the propulsion time vertically. This map reveals the main pressure disturbance sources, abrupt change areas, and their evolution trends at the bottom of the thrust reverser frame throughout the construction process.

[0059] Based on the two-dimensional disturbance distribution map, the bottom area of ​​the thrust reverser frame is classified and zoned according to the density, intensity, and duration of the disturbance signals, thus formally forming the load-bearing fluctuation map. In the fluctuation map, each identified settlement jump point is classified according to its disturbance level. Level 1 fluctuation areas refer to sections where jump signals appear for two or more consecutive cycles, with jump amplitudes exceeding 0.8 mm; Level 2 fluctuation areas refer to areas where single-cycle jump amplitudes are between 0.5 mm and 0.8 mm; Level 3 fluctuation areas are sections where jumps are unstable but show phased accumulation. Within each fluctuation area, the corresponding thrust rhythm information, settlement response characteristics, spatial coordinates, and jump frequency are integrated and archived, and presented in the load-bearing fluctuation map using a color-coded isopleth distribution. For example, if three Level 1 disturbance sources appear on the left side of the front section of the bottom of the thrust reverser frame at 620 meters, forming a continuous fluctuation section lasting 22 seconds and spanning 4 channels, this area will be displayed as a dense red area in the map. Once the load-bearing fluctuation map is generated, it serves as the input basis for subsequent support regulation and pre-adjustment control, providing quantitative evidence and location methods for early identification of risk-bearing areas and precise intervention. The entire process establishes a logical closed loop from thrust loading → settlement response → data fusion → spatial mapping → fluctuation map construction, providing solid data support and physical mechanism basis for subsequent control steps.

[0060] S3, based on the load fluctuation diagram, divides the high-risk load area, embeds wedge-shaped support plates in the high-risk load area, and allows for stiffness fine adjustment through stroke adjustment. The wedge-shaped support plates absorb uneven stress during thrust changes, generating a support adjustment list containing the stroke adjustment parameters of each support plate.

[0061] After constructing the load fluctuation map and accurately calibrating the disturbance levels in different areas at the bottom of the thrust reverser frame, high-risk load areas need to be selected as active control target areas based on the fluctuation distribution results. Wedge-shaped support plates with stroke adjustment capabilities are then installed within these areas to actively absorb and fine-tune the non-uniform stress caused by sudden thrust changes during propulsion. Simultaneously, a support adjustment list with executable parameters is generated to support the next stage of support response strategy formulation and dynamic support sequence construction. The specific implementation steps are as follows:

[0062] Based on the first-level fluctuation area and continuous disturbance section delineated in the load-bearing fluctuation diagram, the boundary range of the high-risk load-bearing area is determined, and dual positioning of the construction surface coordinates and thrust rhythm spectrum channel numbers is completed. Each high-risk load-bearing area is numbered as an independent unit, and its length, width, disturbance intensity level, disturbance frequency, and spatial center point coordinates are marked respectively. For example, in the section from 640 meters to 670 meters, if the load-bearing fluctuation diagram shows that there are more than three consecutive first-level fluctuation nodes within the range of the 3rd to 6th thrust channels in the left front area, and the spatial span exceeds 0.8 meters, then this area is defined as a first-level high-risk load-bearing area, and the coordinates of the center reference point are set as (640.9 meters, 0.5 meters to the left). Subsequently, based on the area and disturbance direction of each high-risk load-bearing area, the specific number and arrangement of wedge-shaped support plates are designed. Under normal circumstances, a standard of not less than one wedge-shaped support plate per square meter is used, and the controlled coverage area of ​​each support plate does not exceed 0.6 meters by 0.6 meters. During the installation process, the wedge-shaped support plate must be interlocked with the pressure-sensitive pad layer without any gaps or interference. An elastic buffer liner should be applied between the bottom surface and the foundation contact surface to absorb the local prestress during the plate installation process.

[0063] After the wedge-shaped support plates were installed in the high-risk load-bearing area, the structural parameters of each support plate were calibrated. Each wedge-shaped support plate is composed of stacked inclined wedges, which change in overall height through longitudinal movement to achieve stiffness adjustment. A spiral lifting mechanism is installed between the wedges, and a sixteen-tooth ratchet structure is used for precise control, with an adjustment stroke range of 0 to 10 mm and an adjustment resolution of 0.25 mm. To ensure structural stiffness and response sensitivity, each wedge-shaped support plate underwent no less than fifty loading cycle tests before leaving the factory, with load variations ranging from 0.2 MPa to 0.5 MPa applied during the tests to verify its stability under continuous excitation. After on-site installation, a local loading response verification test is performed again. A single equivalent static load of one ton is applied to each support plate using a hydraulic loading device, and the wedge displacement response data is recorded within two minutes before and after loading to form an initial load response curve. This curve will serve as the basis for subsequent thrust jump response determination.

[0064] After completing the installation and structural parameter calibration of all wedge support plates, the mechanical state of each high-risk load zone in different propulsion cycles was predicted and superimposed based on the thrust rhythm spectrum and load fluctuation diagram generated in the previous stage. This allowed for the derivation of the dynamic load that each support plate should bear at different times. Based on this, and combined with the support plate stroke adjustment curve, the required rise or fall amount in each time period was calculated. For example, when propulsion reached 690 meters, a sustained thrust peak of 0.38 MPa was predicted to occur between cycles 13 and 16, corresponding to the area of ​​the 5th wedge support plate. After analysis of the initial response curve, the optimal suction adjustment stroke was determined to be a rise of 2.75 mm, held for 6 seconds, and then returned to the original position. The pre-adjusted target stroke, duration, adjustment rate, and recovery status of all support plates in different time periods were recorded, summarized, and assigned numbers.

[0065] Based on the above adjustment data, a unified support adjustment list was compiled. This list uses the advance mileage as the main index, dividing the work into sections of 10-meter advance distances. It lists the adjustment actions required for each wedge support plate in that section, including the adjustment start time, stroke height, holding time, recovery strategy, and load prediction level. For example, in the 700-710 meter section, support plate A-17 needs to complete a descent adjustment within the 91st cycle, with a stroke of 3 mm and a holding time of 9 seconds, corresponding to a disturbance level of level two. The entire list uses a standardized table format, arranged chronologically to facilitate subsequent synchronization with the jacking cycle. After the support adjustment list is completed, it will serve as the input data source for the next stage of bottom support pre-adjustment sequence, thereby achieving closed-loop control throughout the entire process from thrust disturbance prediction and settlement trend identification to support adjustment path construction. The establishment of this list not only enables visualized and data-driven management of support adjustment behavior in high-risk load areas but also provides a fundamental decision-making basis for accurately controlling the jacking attitude and suppressing tilting trends.

[0066] S4, according to the support adjustment list, insert the bottom support pre-adjustment sequence into the jacking cycle, and use the bottom support pre-adjustment sequence to drive the wedge support plate to complete synchronous micro-lifting and synchronous micro-lowering operations in the corresponding cycle, transfer the predicted local pressure loss position to the controllable area, and generate a traction command series containing the phased adjustment requirements;

[0067] After compiling the support adjustment list, the adjustment instructions in the list need to be embedded into the construction cycle of the pipe jacking process to form an executable bottom support pre-adjustment sequence. Driven by this pre-adjustment sequence, the wedge support plate is controlled in real time to achieve synchronous micro-lifting and micro-lowering operations within the corresponding advancement cycle. This effectively transfers the center of gravity of the local pressure loss area, constructs the control path, and generates a traction command sequence with time sequence and spatial directionality, providing complete control information for subsequent dynamic support linkage. The specific steps are as follows:

[0068] Before the advancement phase begins, the adjustment parameters of the wedge support plates corresponding to each advancement distance in the support adjustment list are precisely aligned with the advancement cycle. The advancement cycle is based on the time required for one tunnel jacking advance; for example, a typical advancement cycle is 25 seconds, and approximately 12 to 15 advancement cycles correspond to every 10 meters of advancement. The adjustment start time of each wedge support plate in the list is aligned with the advancement cycle cycle by cycle to construct a time sequence structure. Taking the 730-740 meter section as an example, if support plate number B-04 requires a micro-lift operation with a stroke of 2.5 mm and a hold time of 10 seconds during the 8th to 10th advancement cycles, then the start time of the 8th cycle in the cycle sequence is set as the support plate drive start node. All support plate action commands are integrated into a unified control table with millimeter-level stroke accuracy and second-level time granularity, using the advancement time as the axis. This table sequentially stores the operation cycle number, stroke size, duration, and recovery time of all support plates to form the time control framework for the bottom support pre-adjustment sequence.

[0069] After the bottom support pre-adjustment sequence is established, each adjustment action in the pre-adjustment sequence is synchronously transmitted to the wedge support plates via electromechanical actuators and executed cycle by cycle during actual propulsion. In specific operation, each support plate achieves relative movement of the upper and lower wedges through its associated mechanical adjustment mechanism, and begins to move upward or downward according to the specified stroke value within the specified cycle after the command is issued. To ensure synchronization, all support plates belonging to the same support surface area within the same propulsion cycle must complete the action start within a time difference of less than 0.5 seconds, thereby avoiding mechanical abrupt changes caused by local uneven stiffness. For example, in the 12th propulsion cycle, support plates B-04, B-05, and B-06 need to complete a 1.75 mm rise action simultaneously, so the start time of all three plates should not exceed 0.3 seconds before the start of the cycle. The moving speed is automatically allocated according to the thrust jump level, generally set between 0.35 mm / s and 0.65 mm / s, ensuring that the adjustment action can respond to thrust changes without causing disturbance backlash. Throughout the adjustment process, each support plate must undergo an action confirmation process. Once the action has reached the target stroke, it must be held for a specified duration and then smoothly return to its initial state.

[0070] As the pre-adjustment sequence continues to execute, the localized pressure loss areas identified in the original load fluctuation diagram will be supplemented by the raising of the support plates, thereby weakening their pressure loss trend. Simultaneously, the slight lowering of some non-critical support plates will actively shift a portion of the stress center to the boundary of the original high-risk area, thus achieving local stress redistribution. Throughout the propulsion cycle, the raising and lowering of the support plates will continuously make subtle adjustments to the stress trajectory along the propulsion path. For example, when advancing to the 770-meter segment, if the originally identified pressure loss point is located 0.7 meters to the right front of the propulsion path, support plates numbered C-12 and C-13 will be raised by 2.2 mm and 2.4 mm respectively to create inward pressure compensation, while support plates C-09 and C-10 will be lowered by 1.8 mm and 1.5 mm respectively to create a support antagonistic zone, spatially pulling the pressure loss area back into the overall control area. During this force transfer process, all support plate stroke adjustment processes are quantified and recorded in real time, and are fitted and analyzed in conjunction with the previous rhythm spectrum and settlement data to generate the support response trajectory within each propulsion cycle.

[0071] Based on the support response trajectory and propulsion cycle time points, the traction command sequence is generated on the propulsion control terminal. The traction command sequence is a set of time-sequential control commands for the back support medium of the thrust reverser. Its core content includes key control parameters such as: target cycle number, expected force deflection direction, required differential pressure level, corresponding pressure chamber partition, pressure adjustment start time, and maintenance time. For example, in the 24th propulsion cycle of the 810-meter segment, if the corresponding bottom support adjustment action is an overall rightward deflection of 1.9 mm, the system will automatically generate control commands for the fourth and fifth hydraulic walls behind the thrust reverser to raise the internal pressure of the chambers from 0.21 MPa to 0.28 MPa within 3 seconds after the start of this cycle, maintain this pressure for 6 seconds, and then return to the initial value. All traction command sequences are generated in sets every 10 meters of propulsion distance, with numbers corresponding one-to-one with the propulsion cycle, allowing subsequent hydraulic traction walls to respond and execute step-by-step in a rhythmic sequence within the dynamic support field. This method effectively links the early thrust rhythm spectrum, settlement data, bearing fluctuation diagram, and support adjustment list to form a bottom dynamic control mechanism that integrates time-driven, spatial control, pressure adaptation, and path correction, thereby achieving continuous fine-tuning of the pipe jacking attitude and stable control of the mechanical path.

[0072] S5, according to the traction command series, controls the partitioned hydraulic traction wall set behind the thrust reverser. Through the phased pressure adjustment of each hydraulic chamber before and after the arrival of high-frequency thrust, the continuous pressure-sensing pad, wedge support plate and partitioned hydraulic traction wall form a three-way linkage dynamic support field. In the dynamic support field, the tilting trend caused by the misalignment of the thrust rhythm is offset in real time, so as to realize the active dynamic control of the jacking thrust link.

[0073] After generating the traction command series and clarifying the adjustment strategy for the support pressure of each zone, the traction command needs to be accurately issued to the zoned hydraulic traction wall behind the thrust reverser frame. The hydraulic chamber then performs phased pressure adjustments before and after the high-frequency thrust cycle, thereby forming a three-way dynamic support field with the continuous pressure-sensitive pad layer and wedge-shaped support plate. Within this dynamic support field, the thrust direction and attitude changes are coordinated in real time, eliminating tilting tendencies caused by thrust rhythm misalignment, and achieving active dynamic control of the pipe jacking thrust chain. The specific implementation steps are as follows:

[0074] Based on the generated traction command sequence, the space behind the thrust reverser is divided into zones for positioning, and the layout and numbering of the hydraulic traction walls are confirmed. As the supporting wall of the overall structure, the hydraulic traction walls are spatially divided into multiple independent zones symmetrically arranged on both sides, typically 6 to 8 zones per side. Each zone contains an independent hydraulic chamber, which uses cylinders to define the direction and control the strength of the rear wall. The layout of the hydraulic chambers is uniformly identified using the numbering system of the pressure-sensing pad layer and wedge-shaped support plate at the bottom of the thrust reverser, ensuring a corresponding relationship during subsequent execution. For example, if the bottom support plates C-04 to C-06 are located on the left rear side of the thrust reverser, then hydraulic traction wall zones W-03 and W-04 should be located directly behind this position, equipped with independent inlet and outlet oil circuits and pressure control valve assemblies. During installation, a static pressure test of the hydraulic system is required. The test pressure is set at 1.2 times the maximum design value. That is, if the normal working pressure is 0.30 MPa, the test pressure is 0.36 MPa. This ensures that the hydraulic chamber has no leakage, no impact, and no pressure differential hysteresis under high-frequency working conditions.

[0075] Before the propulsion phase, based on the propulsion timeline and pre-adjustment sequence, the time nodes, pressure changes, maintenance times, and recovery mechanisms within the traction command sequence are allocated to each hydraulic traction wall section. Each traction command must specify its start time and execution cycle position. For example, 3 seconds before the 12th cycle in the 850-meter propulsion section, the hydraulic chamber of section W-05 should increase its pressure from 0.22 MPa to 0.30 MPa, maintain this pressure for 6 seconds, then slowly decrease it to 0.24 MPa and maintain this pressure until the next propulsion cycle begins. All commands are uniformly incorporated into the time sequence table and matched with the bottom support pre-adjustment sequence to achieve precise timing control. The response speed of the hydraulic traction wall is controlled according to the pressure adjustment rate, typically within a range of 0.015 MPa per second, to ensure that structural impact or attitude rebound is not caused by excessively rapid force transmission. During pressure adjustment, the hydraulic chambers of each section use electro-hydraulic proportional valves to subdivide the oil volume, controlling the adjustment accuracy within ±0.005 MPa, ensuring that each traction adjustment closely follows the expected thrust rhythm curve.

[0076] As the traction commands are executed in stages, each section of the hydraulic traction wall gradually completes the dynamic support force output to the rear of the thrust reverser, forming a closed-loop interactive mechanism with the lifting and lowering behavior of the wedge-shaped support plate in front and the response data of the bottom pressure-sensitive pad layer. For example, in the 880-meter stage, the thrust rhythm spectrum shows a peak increase of 0.39 MPa in the 14th cycle, the 18th channel of the bottom pressure-sensitive pad layer records a pressure jump of 0.12 MPa, the support plate D-09 performs a 2.8 mm rise, and at the same time, the section hydraulic traction wall W-06 completes the pressure rise 3 seconds before the cycle, forming a rearward vector support thrust, stabilizing the overall attitude of the thrust reverser within ±0.15 degrees of the design alignment center. At this time, the three together constitute a three-way force support network from bottom to back in space: the lower pressure-sensitive pad layer provides real-time response feedback, the middle wedge-shaped support plate performs stiffness fine-tuning, and the upper hydraulic traction wall implements directional force vector compensation. The three structures continuously coordinate and adjust in units of the propulsion cycle, establishing a dynamic support field in space. This ensures that the pipe jacking attitude is dynamically guided and corrected in real time within each cycle, guaranteeing the stability of the entire propulsion path without deviation.

[0077] After the dynamic support field is constructed and enters multi-cycle operation, the system will continuously track the structural response data in each propulsion cycle, especially the load response and attitude changes of each channel in the pressure-sensitive pad layer. Combined with the stroke execution records of the wedge support plate and the pressure adjustment behavior of each section of the hydraulic traction wall, a three-dimensional linkage response map is generated. This map uses every 5 meters of propulsion distance as an analysis unit, recording the response behavior of the three-way devices in each key cycle within that section. For example, in the 910-meter section, during cycles 5 to 9, the D-13 support plate rises by 1.9 mm, the pressure difference fluctuation of channels 21 to 24 in the pressure-sensitive pad layer is within ±0.015 MPa, the pressure adjustment of the W-07 hydraulic chamber is within the range of 0.26 to 0.31 MPa, the overall thrust deviation angle is always controlled within ±0.12 degrees, and there is no cumulative attitude drift. This type of map serves as real-time feedback during construction, used to determine the effectiveness of the current support control strategy, and provides a basis for parameter optimization for the next section of construction. Thus, through the precise execution of the traction command sequence, the partitioned hydraulic traction wall completed the dynamic linkage with the wedge support plate and the pressure-sensitive pad layer. The three-dimensional force structure worked together to build a complete support response network, maintaining the stability of the jacking posture under high-frequency thrust rhythm changes, and ensuring that the jacking link is always under control during ultra-long-distance construction.

[0078] This invention establishes an active control system based on thrust data sensing, centered on dynamic support adjustment, and employing three-dimensional linkage control. This system can identify and respond to thrust rhythm changes in real time during jacking, accurately locate and mitigate the risk of localized pressure loss at the bottom of the thrust reverser, and achieve full-process, closed-loop dynamic control of the pipe jacking attitude. By organically coordinating the pressure-sensitive pad, wedge-shaped support plate, and zoned hydraulic traction wall, this method not only effectively suppresses the chain reaction of attitude deviation caused by thrust load pulsation but also breaks through the limitations of traditional construction methods that rely on experience-based adjustments and passive corrections. It achieves full-process control from data-driven mechanical identification to active support response and precise attitude correction, effectively improving the accuracy, safety, and one-time breakthrough success rate of ultra-long-distance pipe jacking construction. This system has significant application value for urban water supply network construction traversing complex geological conditions, sensitive surface environments, and requiring high-precision positioning.

[0079] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A method for constructing an urban water supply pipe network over a long distance by pipe jacking, characterized in that, Includes the following steps: S1, before the construction of the starting well, a continuous pressure-sensitive pad layer is laid at the bottom of the thrust reverser frame. The thrust magnitude, duration of action and thrust change rhythm generated by each jacking are recorded by the pressure-sensitive unit to generate a thrust rhythm spectrum. S2, superimpose the thrust rhythm spectrum on the time axis with the settlement measurement line at the bottom of the thrust reverser, extract the settlement jump signal from the section corresponding to the thrust peak, and form the bearing fluctuation map at the bottom of the thrust reverser; S3, based on the load fluctuation diagram, divides the high-risk load area, and embeds a wedge-shaped support plate in the high-risk load area, which can be finely adjusted in stiffness through stroke adjustment. The wedge-shaped support plate absorbs uneven stress during the thrust change process and generates a support adjustment list. S4, according to the support adjustment list, insert the bottom support pre-adjustment sequence into the jacking cycle, and use the bottom support pre-adjustment sequence to drive the wedge support plate to complete synchronous micro-lifting and synchronous micro-lowering operations in the corresponding cycle, transfer the predicted local pressure loss position to the controllable area, and generate traction command series; S5, based on the traction command series, controls the partitioned hydraulic traction wall set behind the thrust reverser. Through the phased pressure adjustment of each hydraulic chamber before and after the arrival of high-frequency thrust, the continuous pressure-sensitive pad, wedge-shaped support plate and partitioned hydraulic traction wall form a three-way linkage dynamic support field. In the dynamic support field, the tilting trend caused by the misalignment of the thrust rhythm is offset in real time, realizing the active dynamic control of the jacking thrust link.

2. The method according to claim 1, wherein, Step S1 includes: After the structural construction and site stability acceptance at the bottom of the thrust reverser frame are completed, a continuous pressure-sensitive pad layer is laid according to the outer contour of the thrust reverser frame foundation and the shape of the bottom contact area, and pressure-sensitive units are arranged at uniform intervals in the horizontal direction so that the pressure-sensitive units form a thrust sensing structure covering the bottom of the thrust reverser frame. After the installation is completed, static pressure calibration is performed. Standard pressures of different levels are applied to each pressure-sensitive unit using a standard loading device, and the initial response curves are recorded to form a reference template for thrust identification. During the pipe jacking process, high-frequency data is recorded for each pressure-sensing unit in continuous jacking cycles, and the jacking time and longitudinal displacement of the thrust reverser are recorded simultaneously to form thrust segments and construct thrust evolution sequences. Based on the thrust evolution sequence, continuous time periods are divided according to the thrust length. The thrust data is then subjected to trend analysis and graphing to generate a thrust rhythm spectrum covering the entire process. The correspondence between the thrust rhythm spectrum and the spatial position of the bottom of the thrust reverser is then calibrated.

3. The method for constructing ultra-long-distance pipe jacking in urban water supply networks according to claim 2, characterized in that, After completing the graphical processing of the thrust rhythm spectrum, the peak thrust segments in the thrust rhythm spectrum are spatially mapped to the positioning numbers of each pressure-sensitive unit in the continuous pressure-sensitive pad layer. This establishes a correspondence between the time information of the peak thrust segments and the actual bearing position at the bottom. During the propulsion process, a rhythm update page is generated according to a fixed propulsion length to calibrate the average thrust, abnormal frequency, and high-risk segment positions, thereby improving the matching accuracy of subsequent support adjustment and attitude control.

4. The method for constructing ultra-long-distance pipe jacking in urban water supply networks according to claim 2, characterized in that, Step S2 includes: After the thrust rhythm spectrum is drawn, a continuous settlement measurement line is laid at the bottom of the thrust reverser frame, and a static load loading test is conducted through a multi-point continuous displacement sensor to form a settlement curve benchmark. During the pipe jacking process, the longitudinal settlement data collected by the settlement survey line is synchronized with the thrust cycle in the thrust rhythm spectrum according to the time nodes, and the settlement drop data is marked on the time axis of the thrust rhythm spectrum. After completing the synchronous superposition, the settlement jump signal in each propulsion cycle is identified, and spatial mapping is performed based on the spatial location corresponding to the jump signal and the channel number in the thrust rhythm spectrum to form a two-dimensional disturbance distribution map. Based on the two-dimensional disturbance distribution map, the bottom region of the thrust reverser is graded according to the disturbance signal density, intensity and duration, and the thrust rhythm information and settlement response characteristics are integrated to form a bearing fluctuation map.

5. The method for constructing ultra-long-distance pipe jacking in urban water supply networks according to claim 4, characterized in that, The extraction of settlement jump signals is limited to identifying the rapid descent of settlement measuring points within a short period of time during the peak period of the thrust rhythm spectrum. Settlement measuring points whose rapid descent exceeds the preset change range are taken as the source of the jump signal. In the spatial mapping process, only settlement measuring points that are consistent with the position of the thrust channel are selected to construct the bearing fluctuation diagram, so as to ensure that the spatial correspondence accuracy of the disturbance distribution in the bearing fluctuation diagram is consistent with the force change at the bottom of the reverse thrust frame.

6. The method for constructing ultra-long-distance pipe jacking in urban water supply networks according to claim 4, characterized in that, Step S3 includes: Based on the first-level fluctuation area and continuous disturbance section in the load-bearing fluctuation diagram, the boundary range of the high-risk load-bearing area is determined, and the dual positioning of the construction surface coordinates and the thrust rhythm spectrum channel number is completed. At the same time, the number and arrangement of wedge support plates are designed and the interlocking arrangement with the pressure-sensitive pad layer is completed. After the wedge-shaped support plates are installed in the high-risk load-bearing area, the structural parameters of each support plate are calibrated. The stiffness adjustment characteristics are confirmed by the stroke adjustment structure of the upper and lower stacked inclined wedges, and the initial load response curve is recorded. After completing the parameter calibration of the wedge support plate, the mechanical state of each high-risk bearing area in different propulsion cycles was superimposed and analyzed based on the thrust rhythm spectrum and bearing fluctuation diagram. The required lifting and lowering amounts of each support plate in different time periods, as well as the corresponding duration and recovery state, were calculated. After calculating the stroke adjustment amount of each support plate, a support adjustment list is compiled using the advance mileage as an index. The adjustment start time, stroke height, maintenance time and load prediction level of each support plate are recorded to provide input data for the next stage of support pre-adjustment sequence.

7. A method for constructing ultra-long-distance pipe jacking in urban water supply networks according to claim 6, characterized in that, The formation of the support adjustment list further includes uniformly marking the spatial center point coordinates of each wedge support plate in the high-risk load-bearing area, and setting a corresponding adjustment priority for each wedge support plate according to the disturbance intensity level in the load fluctuation diagram, so that the wedge support plates with higher adjustment priority can obtain a more advanced stroke adjustment sequence in the propulsion cycle, thereby improving the overall response stability of the high-risk load-bearing area.

8. A method for constructing ultra-long-distance pipe jacking in urban water supply networks according to claim 6, characterized in that, Step S4 includes: Before the start of the propulsion phase, the adjustment parameters of each wedge support plate in the support adjustment list are used to connect with the propulsion cycle. The adjustment start time, stroke size, duration and recovery time of each support plate are integrated according to the propulsion time to form the bottom support pre-adjustment sequence. After the bottom support pre-adjustment sequence is established, the wedge support plate is driven by the mechanical adjustment mechanism to perform synchronous micro-lifting and synchronous micro-lowering operations within the corresponding propulsion cycle, and the consistency of the action start time is maintained in the same support surface area to avoid sudden changes in local stiffness. During the continuous execution of the pre-tuned sequence, the local pressure loss area identified in the original load fluctuation diagram is compensated by the lifting and lowering behavior of the wedge support plate, and the center of gravity of the load is redistributed by the slight lowering behavior of the support plate in the non-critical area to form the support response trajectory. After the support response trajectory is formed, the traction command sequence is generated according to the propulsion cycle time point, and the cycle number, force deflection direction, pressure adjustment start time and maintenance time in the traction command sequence are used as the control basis for subsequent hydraulic traction wall execution.

9. A method for constructing ultra-long-distance pipe jacking in urban water supply networks according to claim 8, characterized in that, When the wedge support plate is driven by the mechanical adjustment mechanism to perform synchronous micro-lifting and synchronous micro-lowering operations, the lifting speed and stroke change of each support plate are matched in stages according to the thrust intensity of the corresponding cycle in the thrust rhythm spectrum. After the action is completed, it automatically returns to the preset initial stroke position according to the support response trajectory, so as to ensure the rhythm consistency and mechanical stability of the bottom support pre-adjustment sequence in the continuous propulsion cycle.

10. A method for constructing ultra-long-distance pipe jacking in urban water supply networks according to claim 9, characterized in that, Step S5 includes: The space behind the thrust reverser is divided into zones according to the traction command sequence, and the layout and numbering of the hydraulic traction walls are confirmed. At the same time, an independent hydraulic chamber is set in each zone and the static pressure test of the hydraulic system is completed to ensure pressure stability under high-frequency working conditions. Before the implementation of the advancement phase, the time nodes, pressure changes, maintenance time and recovery mechanism in the traction command series are allocated to the hydraulic traction wall partitions according to the advancement time axis and pre-adjustment sequence, and the response speed of the hydraulic chamber is controlled by the pressure regulation rate to achieve precise timing control. During the phased execution of the traction command series, a closed-loop interaction mechanism is formed by the pressure output of the hydraulic traction wall, the lifting behavior of the wedge support plate, and the load response data of the continuous pressure-sensitive pad layer. A three-dimensional force support network is constructed during the propulsion cycle to stabilize the attitude of the thrust reverser. After the dynamic support field enters continuous operation, the structural response data in each propulsion cycle is tracked, and a three-dimensional linkage response spectrum is generated by combining the wedge support plate stroke record and the hydraulic traction wall pressure adjustment behavior, so as to serve as the feedback basis and parameter optimization basis in the propulsion process.

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