Construction equipment for large-section rectangular pipe jacking in complex environment

Abstract

The application provides a large-section rectangular jacking pipe construction equipment in a complex environment, and belongs to the technical field of underground space construction equipment, and comprises a front-end subsystem, a main driving system, a rear-end propulsion subsystem and an integrated control system. The front-end subsystem comprises a low-disturbance combined cutterhead and a front shield cutter assembly arranged towards the tunneling direction. The main driving system is redundantly designed, has reserved motor-reducer mounting hole positions, and is configured with a motor matched with the low-disturbance combined cutterhead. The rear-end propulsion subsystem comprises a modularly assembled propulsion frame and an equal-thrust double-stroke oil cylinder. The integrated control system comprises a soil pressure measurement and control module and a guide module. The application ensures stable construction performance in the case of long single jacking distance, water-rich and easy-to-gush water and sand stratum, and is suitable for the special requirement of large rectangular section, so as to effectively improve the construction efficiency, reduce the safety risk, and ensure the engineering quality.

Description

Technical Field

[0001] This invention relates to the field of underground space construction equipment technology, specifically to a construction equipment for ultra-large cross-section rectangular pipe jacking in complex environments. Background Technology

[0002] In underground space development, rectangular pipe jacking technology has gradually become the mainstream method for urban underground tunnel construction due to its advantages such as high cross-sectional utilization and shallow overburden depth. However, implementing ultra-large cross-section rectangular pipe jacking projects in complex environments still faces severe challenges, specifically:

[0003] I. Complex Geological Conditions: The construction area mainly traverses silty soil interbedded with silty sand and silty sand strata. The silty soil interbedded with silty sand strata are slightly dense to medium dense, with low strength, poor uniformity, and weak permeability; the silty sand strata are medium dense to dense, with moderate permeability and strong water-bearing capacity. These strata have poor self-stability and are prone to causing instability of the excavation face, water inrush, and sand inrush, placing extremely high demands on the attitude control of the pipe jacking machine and the accuracy of surface settlement. II. Defects in Ultra-Large Cross-Section Construction: The traditional rectangular pipe jacking machine cutterhead layout is difficult to cover the entire excavation face, and the residual soil in the blind area leads to uneven cutting, exacerbating stratum disturbance; during long-distance jacking, the conventional drive system has low torque redundancy, resulting in a high risk of downtime due to malfunction. III. Weak Dynamic Control Capability: In water-bearing strata, the single screw conveyor has limited soil removal capacity, and the soil chamber pressure fluctuates greatly, easily causing excavation face collapse; the guidance system relies on manual measurement, resulting in poor real-time performance.

[0004] Therefore, there is an urgent need for an integrated equipment specifically designed for the construction of ultra-large cross-section rectangular pipe jacking in complex geological formations. Summary of the Invention

[0005] Purpose of the invention: The purpose of this invention is to address the shortcomings of existing technologies by providing a construction equipment for ultra-large cross-section rectangular pipe jacking in complex environments. This equipment ensures stable construction performance even when the single jacking distance is long and the jacking passes through water-rich and sand-prone strata. It also adapts to the special requirements of large rectangular cross-sections, thereby effectively improving construction efficiency, reducing safety risks, and ensuring project quality.

[0006] Technical Solution: The present invention provides an equipment for constructing ultra-large cross-section rectangular pipe jacking in complex environments, comprising a front-end subsystem, a main drive system, a rear-end propulsion subsystem, and an integrated control system. The front-end subsystem includes a low-disturbance combined cutterhead 1 and a front shield cutterhead assembly 2, both oriented towards the tunneling direction. The low-disturbance combined cutterhead 1 is vertically divided into an upper and lower row. The upper cutterhead in the upper row includes a large cutterhead 101 located at the center, with a middle cutterhead 102 on each side of the large cutterhead 101. The middle cutterheads 102 and the large cutterhead 101 are connected... A small cutterhead 103 is positioned between the upper and lower cutterheads; the lower cutterhead in the lower row includes a central cutterhead 102, with a large cutterhead 101 on each side of the central cutterhead 102; a set of foam nozzles 104 are evenly distributed on both the upper and lower cutterheads; the main drive system is a redundant design, with reserved mounting holes for the motor reducer, and is equipped with a motor compatible with the low-disturbance combined cutterhead 1; the rear propulsion subsystem includes a modularly assembled propulsion frame and a constant-thrust double-stroke hydraulic cylinder; the integrated control system includes an earth pressure measurement and control module and a guidance module;

[0007] The front output shaft of the main drive system is connected to the front subsystem, and the rear input shaft of the main drive is connected to the rear propulsion subsystem. The integrated control system is electrically or signal connected to the main drive system, the front subsystem, and the rear propulsion subsystem, respectively.

[0008] Furthermore, the front shield blade assembly includes a cap support structure located on the upper part of the front cutterhead and a shield blade located in the blind zone of the cutterhead.

[0009] Furthermore, the modularly assembled propulsion frame includes support rings, which are provided in several groups, with each group of support rings arranged along the axial direction of the entire propulsion frame.

[0010] Furthermore, the support ring is composed of several splicing pieces, two of which are located above and below the support ring assembly, two of which are located on the left and right sides of the support ring assembly, and the remaining splicing pieces are located at the four corners of the support ring assembly. The specific shape of the splicing pieces depends on their location.

[0011] Furthermore, several axial fixing blocks are radially distributed on the inner arc surface of the splicing piece, and several axial fixing blocks are jointly fixedly connected to a radial fixing block. The radial fixing block is fixedly connected to radial connecting blocks at both ends of the splicing piece. Two adjacent splicing pieces are fixedly connected by two radial connecting blocks and bolts.

[0012] Furthermore, the propulsion frame also includes several axial connectors, which are used to connect two adjacent support ring groups. The bottom of the axial connector is provided with two grooves, which are respectively engaged with two radial fixing blocks in the two support ring groups. In addition, the axial connector is also connected to the radial fixing blocks by bolts.

[0013] Furthermore, a number of hydraulic cylinders are evenly distributed on one axial end face of the propulsion frame and fixedly connected thereto. The number of hydraulic cylinders depends on the area of ​​the axial end face of the splicing piece. The larger the area of ​​the axial end face of the splicing piece, the more hydraulic cylinders are installed on the splicing piece.

[0014] Furthermore, the axial connector includes a connecting rod and two clips, wherein the connecting rod is located between the two clips, and both clips are rotatably connected to the connecting rod. The clips are provided with grooves for engaging with the radial fixing block.

[0015] Beneficial effects: Compared with the prior art, the advantages of the present invention are as follows:

[0016] This invention achieves efficient excavation capabilities with minimal impact on the strata under complex geological conditions through a front-end low-disturbance combined cutterhead design and a high-torque, high-reliability main drive system. Simultaneously, the rear-end precision propulsion system, high-strength, high-rigidity shell design, integrated earth pressure monitoring and control system, and high-precision guidance system jointly ensure the stability and safety of the pipe jacking machine in ultra-large cross-section rectangular pipe jacking construction, greatly improving construction efficiency and quality, reducing construction risks, and making it suitable for tunnel construction needs in various complex environments. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the low-disturbance combined cutterhead in this invention;

[0018] Figure 2 This is a schematic diagram of the front shield blade assembly in this invention;

[0019] Figure 3 This is a schematic diagram of the shield-body shovel blade in this invention;

[0020] Figure 4 This is a schematic diagram of the brim support structure in this invention;

[0021] Figure 5 This is a schematic diagram of the propulsion frame in this invention;

[0022] Figure 6 This is a schematic diagram of the splicing piece in this invention;

[0023] Figure 7 This is a layout diagram of the hydraulic cylinder in this invention;

[0024] Figure 8This is a schematic diagram of the installation of the earth pressure sensor in this invention;

[0025] Figure 9 This is a schematic diagram of the guiding module in this invention;

[0026] Figure 10 This is the pipe section used in Example 1. In the figure, 1-low disturbance combined cutterhead, 101-large cutterhead, 102-medium cutterhead, 103-small cutterhead, 104-foam nozzle, 2-front shield blade assembly, 201-cap support structure, 202-shield blade, 3-propulsion frame, 301-splitting piece, 302-axial fixing block, 303-radial connecting block, 304-radial fixing block, 305-axial connecting piece, 3051-connecting rod, 3052-buckle, 4-cylinder, 5-earth pressure monitoring module, 501-screw conveyor, 502-earth pressure sensor, 6-guide module, 601-dual-axis inclinometer, 602-theodolite. Detailed Implementation

[0027] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the embodiments described.

[0028] In this embodiment, the outer diameter of the pipe section is 11350*7500mm, the inner diameter is 9750*5900mm, the thickness is 800mm, and the width is 1500mm. Figure 10 As shown.

[0029] A construction equipment for ultra-large cross-section rectangular pipe jacking in complex environments includes a front subsystem, a main drive system, a rear propulsion subsystem, and an integrated control system. The front subsystem comprises a low-disturbance combined cutterhead 1 and a front shield cutter assembly 2 oriented towards the tunneling direction. The front output shaft of the main drive system is connected to the front subsystem, and the rear input shaft of the main drive system is connected to the rear propulsion subsystem. The integrated control system is electrically or signal-connected to the main drive system, the front subsystem, and the rear propulsion subsystem. The main drive system features a redundant design, with reserved mounting holes for a motor and reducer, and is equipped with a motor compatible with the low-disturbance combined cutterhead 1. The rear propulsion subsystem includes a modularly assembled propulsion frame and a constant-thrust double-stroke hydraulic cylinder. The integrated control system includes an earth pressure monitoring module and a guidance module. The entire equipment's shell adopts a high-strength, high-rigidity design, integrating an earth pressure monitoring system and a high-precision guidance system, which not only improves the equipment's stability but also greatly enhances construction safety, thereby ensuring efficient and reliable construction of ultra-large cross-section rectangular pipe jacking in complex environments.

[0030] like Figure 1As shown, the low-disturbance combined cutterhead 1 is vertically divided into an upper and lower row. The upper cutterhead in the upper row includes a large cutterhead 101 located in the center, with a middle cutterhead 102 on each side of the large cutterhead 101, and a small cutterhead 103 positioned between the middle cutterhead 102 and the large cutterhead 101. The lower cutterhead in the lower row includes a middle cutterhead 102 located in the center, with a large cutterhead 101 on each side of the middle cutterhead 102. A set of foam nozzles 104 are evenly distributed on both the upper and lower cutterheads. In this embodiment, the low-disturbance combined cutterhead can cover 93% of the entire excavation face of the ultra-large cross-section rectangular jacking pipe. The large cutterhead diameter is designed to be 4.45 meters, the middle cutterhead diameter is 3.9 meters, and the small cutterhead diameter is 1 meter. Each module is equipped with replaceable carbide cutting tools; the shape and angle of the cutting tools are optimized to reduce cutting resistance to the formation. The cutterhead rotation speed is controlled at 30-60 rpm to balance excavation efficiency and ground disturbance. The cutterhead is equipped with multiple foam injection holes, which inject foaming agent at a concentration of 3-5% to further reduce ground disturbance.

[0031] like Figures 2-4 As shown, the front shield cutterhead assembly 2 includes a cap support structure 201 mounted on the upper part of the front cutterhead and shield cutterheads 202 mounted in the cutterhead blind zone. The cap support structure 201 is 0.3 meters wide and made of high-strength alloy material. The cap support protects the top of the excavation face, reduces the collapse and disturbance of the top soil, and ensures soil stability. The angle between the cap and the horizontal plane is designed to be 10° to provide effective soil support. For the traditional cutterhead blind zone, two shield cutterheads 202 are designed on both sides of the front end of the shield, each cutterhead being 1.0 meter long and 0.2 meters wide. The cutterheads are made of wear-resistant hard alloy material to improve their cutting performance and service life. The shield cutterheads are used to clear the soil in the blind zone between the cutterheads, ensuring the integrity of the excavation face.

[0032] With the above cutterhead layout, during soil cutting operations, the large cutterhead speed is controlled at 30 rpm, and the medium and small cutterhead speeds are controlled at 40 rpm to reduce soil disturbance. A foam injection system is installed on the cutterhead, injecting a 4% concentration of foaming agent to further reduce soil disturbance. Earth pressure is monitored and adjusted in real time by an earth pressure monitoring and control system to maintain the stability of the excavation face.

[0033] The redundant drive power design scheme employs a redundant design for the main drive system, meaning that four sets of motor reducer mounting holes are pre-drilled at the front cutterhead of the pipe jacking machine to enable parallel drive of multiple motors. Each mounting hole has been precisely measured and machined to ensure the installation accuracy and stability of the motor reducers.

[0034] The calculation steps for the redundant drive power design scheme are as follows:

[0035] S1. Calculation of jacking force F. The jacking force consists of the frictional resistance between the pipe and the soil, the soil resistance, and additional resistance, which can be simplified as follows:

[0036] F = π × D × L × f + F 附和

[0037] in:

[0038] D: Pipe outer diameter (unit: m)

[0039] L: Jacking length (unit: m)

[0040] f: Frictional resistance per unit area (unit: kN / m) 2 The value is taken according to different soil types, approximately 5–15 kN / m for cohesive soil. 2 Sandy soil has a strength of approximately 10–20 kN / m³. 2 )

[0041] F 附加 Additional resistance (such as the cutting resistance of the cutter head, which is usually taken as 10% to 30% of the total resistance).

[0042] S2. Selection of the advancing speed v. Conventional construction speed: v = 0.5~2.0m / min. This needs to be adjusted according to soil type, pipe diameter, and equipment capacity; use a lower value for cohesive soil and a higher value for sandy soil.

[0043] S3. Values ​​of mechanical efficiency η. Hydraulic system efficiency: η = 0.7–0.85; Electric drive system efficiency: η = 0.8–0.9.

[0044] Motor selection: The large cutterhead uses 21 AC variable frequency motors with a high torque of 2210 kN·m and a low speed of 0.9–1.35 r / min, each with a rated power of not less than 30 kW. The intermediate cutterhead uses 18 AC variable frequency motors with a high torque of 1890 kN·m and a low speed of 0.9–1.35 r / min, each with a rated power of not less than 30 kW. The small cutterhead uses 2 AC variable frequency motors with a low torque of 55 kN·m and a high speed of 5.2–7.8 r / min, each with a rated power of not less than 30 kW. Sufficient space is reserved between the motors and reducers to facilitate heat dissipation and daily maintenance. In the event of a failure of any motor or reducer, the remaining equipment can still maintain at least 75% of its rated torque output to ensure the continuity of construction.

[0045] The drive power P (unit: kW) of the main drive system is calculated as follows:

[0046]

[0047] in:

[0048] F: Pushing force (unit: kN)

[0049] v: Propulsion speed (unit: m / min)

[0050] η: System mechanical efficiency (usually taken as 0.7 to 0.9, with hydraulic systems having an efficiency of approximately 70% to 90%)

[0051] like Figure 5 and Figure 6 As shown, the modularly assembled propulsion frame consists of multiple independent unit components, each of which can be replaced or maintained individually. The propulsion frame unit components are made of high-strength steel to ensure structural strength and durability. The interfaces between modules adopt a standardized design, facilitating rapid assembly and disassembly and improving on-site installation efficiency. Depending on different construction needs, the length and thrust of the propulsion system can be adjusted by increasing or decreasing the number of modules to adapt to pipe jacking construction with different cross-sections. The propulsion system is equipped with 30 equal-thrust double-stroke hydraulic cylinders with a telescopic stroke of 2500mm. Stroke sensors are installed to monitor the telescopic stroke of each cylinder. Each cylinder is equipped with an independent servo control system, achieving a stroke control accuracy of ±1mm, ensuring precise positioning of the pipe jacking machine during the propulsion process. The cylinder response time is less than 0.5 seconds, enabling rapid response to operating commands and improving construction efficiency.

[0052] Specifically, such as Figure 5 As shown, the propulsion frame is composed of several sets of support rings arranged along the propulsion direction. Each set of splicing rings includes several splicing pieces 301, two of which are located above and below the support ring set, two of which are located on the left and right sides of the support ring set, and the remaining splicing pieces 301 are located at the four corners of the support ring set. The specific shape of the splicing piece 301 depends on its position.

[0053] like Figure 6 As shown, several axial fixing blocks 302 are radially distributed on the inner arc surface of the splicing piece 301 and are fixedly connected thereto. Several axial fixing blocks 302 are jointly fixedly connected to a radial fixing block 304. Radial fixing blocks 304 are fixedly connected to radial connecting blocks 303 at both ends of the splicing piece 301. After the axial fixing blocks 302 are fixedly connected to the splicing piece 301 by bolts, the mating surfaces between the axial fixing blocks 302 and the splicing piece 301 are welded together. The radial connecting blocks 303 and the radial fixing blocks 304 are integrally formed. After the radial fixing blocks 304 are fixedly connected to the axial fixing blocks 302 by bolts, the mating surfaces between the radial fixing blocks 304 and 302 and the mating surfaces between the radial fixing blocks 304 and the splicing piece 301 are welded together.

[0054] Thus, along the radial direction of the support ring, two adjacent splicing pieces 301 are fixedly connected by two radial connecting blocks 303 and bolts.

[0055] like Figure 5As shown, the propulsion frame also includes several axial connectors 305, which are used to connect two adjacent support ring groups. The bottom of the axial connector 305 is provided with two grooves, which are respectively engaged with two radial fixing blocks 304 in the two support ring groups. Furthermore, the axial connector 305 is also connected to the radial fixing blocks 304 by bolts.

[0056] like Figure 7 As shown, several hydraulic cylinders 4 are evenly distributed on one axial end face of the jacking frame and fixedly connected to it. The number of hydraulic cylinders 4 is determined by the area of ​​the axial end face of the splicing piece 301; the larger the area of ​​the axial end face of the splicing piece 301, the more hydraulic cylinders 4 are installed on the splicing piece 301. Through the above modular design, suitable modular jacking frame components can be selected and assembled according to the size of the pipe jacking machine and construction requirements. Then, the hydraulic cylinders are installed, and it is ensured that each hydraulic cylinder is correctly connected to an independent servo control system. System debugging is performed to check the working status of each module and hydraulic cylinder, ensuring the stability of the jacking frame and the individual control function of the hydraulic cylinders. During construction, the status of the hydraulic cylinders is monitored in real time through the monitoring system, and the jacking speed and thrust are precisely adjusted according to construction needs to ensure that the pipe jacking machine advances smoothly and accurately.

[0057] like Figure 8 As shown, the earth pressure monitoring and control module includes two sets of screw conveyors and a set of evenly distributed earth pressure sensors. Through the coordinated control of the two Φ194*560mm screw conveyors, pressure fluctuations in the earth chamber are effectively reduced, ensuring stability during the excavation process. Simultaneously, multiple high-precision earth pressure sensors are installed within the earth chamber to provide real-time feedback on earth pressure, offering accurate data support for operations. Furthermore, by precisely controlling the jacking force and jacking speed, fine-tuning of the earth chamber pressure balance is achieved, significantly improving the safety and efficiency of pipe jacking construction.

[0058] Configuration of high-precision earth pressure sensors: At least six high-precision earth pressure sensors are evenly distributed and installed within the earth chamber. The sensors have a measuring range of 0-1.5 MPa and an accuracy of ±0.5% FS. The sensors collect earth pressure data within the earth chamber in real time and transmit the data to the central control system via a data transmission line. The central control system processes the collected data and displays the earth chamber pressure changes in a graphical interface, facilitating real-time monitoring by operators.

[0059] The realization of soil pressure monitoring and control technology requires the coordinated control of screw conveyors: using two sets of Φ194*560mm screw conveyors, the soil output per hour can reach 2×128m³. 3The material is high-strength wear-resistant steel to withstand the wear and tear of long-term excavation operations. The speed of the screw conveyor is controlled between 0-12 rpm to adapt to different soil types and excavation depths. Two screw conveyors work in coordination through a synchronous controller to ensure consistent soil removal rates and reduce fluctuations in soil chamber pressure.

[0060] Achieving precise adjustment of soil chamber pressure balance: A precise servo control system controls the jacking force and speed of the pipe jacking machine, maintaining the jacking force within the range of 100-200 tons and the speed within 10-20 mm / min. Based on real-time data provided by the soil pressure sensor, operators can precisely adjust the soil chamber pressure by adjusting the speed of the screw conveyor and the jacking force. The system presets a safe threshold for soil chamber pressure; when the pressure exceeds the preset range, the system automatically alarms and takes measures to adjust it to the safe range.

[0061] like Figure 9 As shown, the guidance module is equipped with an inclinometer on the shield body, which can monitor and accurately display the rolling status of the main unit in real time, ensuring precise guidance of the pipe jacking machine during the tunneling process. Simultaneously, an innovative guidance system equipped with a theodolite is introduced, combined with image recognition technology, to achieve digital display of guidance data, significantly improving the accuracy and visibility of guidance. This guidance system is existing technology; in this embodiment, it can be put into use as long as it can achieve the aforementioned functions.

[0062] Dual-axis inclinometers are installed at key locations on the shield to ensure accurate sensing of the tunnel jacking machine's rolling status. The inclinometers must be installed horizontally and securely. The inclinometers have a measurement range of ±5° and an accuracy of 0.01°, enabling real-time monitoring of the tunnel jacking machine's rolling angle and transmitting the information to the central control system via data cable. The central control system is equipped with a display screen that shows the inclinometer data in real time and issues an alarm when the tunnel jacking machine's rolling angle exceeds a preset threshold (e.g., ±0.5°).

[0063] A high-precision theodolite is installed at an appropriate location on the pipe jacking machine to measure its azimuth and elevation angles. The theodolite has a measurement range of ±180° and an accuracy of 0.1″. The data collected by the theodolite is transmitted wirelessly to the central control system in real time. Markers are placed within the theodolite's field of view, and image recognition technology is used to automatically identify the position and attitude of the pipe jacking machine. The central control system fuses the data obtained from the theodolite and image recognition technology to display the real-time position and guidance status of the pipe jacking machine in the form of a digital image.

[0064] like Figure 9As shown, in one embodiment of this application, the axial connector 305 includes a connecting rod 3051 and two clips 3052, wherein the connecting rod 3051 is located between the two clips 3052, and both clips 3052 are rotatably connected to the connecting rod 3051. The clips 3052 are provided with grooves for engaging with the radial fixing block 304. The dual-axis inclinometer 601 and the theodolite 602 are both mounted on the connecting rod 3051. Correspondingly, the diameter of the hole for mounting the bolt in one of the two adjacent radial connecting blocks 303 is larger than the diameter of the bolt, so that the splicing piece 301 has a certain offset margin. In this way, when the height position of the two adjacent support ring groups shifts, the connecting rod 3051 will tilt, so that 601 can monitor the tilt angle of the pipe jacking machine.

[0065] like Figure 10 As shown, based on the above system design, the construction will be carried out according to the following steps:

[0066] S1. Install the inclinometer and theodolite, ensuring they are securely fixed, and perform preliminary calibration.

[0067] S2. Connect the inclinometer and theodolite to the central control system, conduct joint system debugging, and verify the accuracy of the data and the stability of the system.

[0068] S3. Before the pipe jacking machine starts tunneling, use a theodolite and inclinometer to calibrate the initial position and attitude.

[0069] S4. During the tunneling process, the data from the inclinometer and theodolite are monitored in real time, and the advancing direction and attitude of the pipe jacking machine are adjusted through the digital display interface of the central control system.

[0070] S5. Regularly check the working status of the inclinometer and theodolite to ensure the accuracy and reliability of the guidance system.

[0071] As described above, although the invention has been shown and described with reference to specific preferred embodiments, it should not be construed as limiting the invention itself. Various changes in form and detail may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A construction equipment for ultra-large cross-section rectangular pipe jacking in complex environments, comprising a front-end subsystem, a main drive system, a rear-end propulsion subsystem, and an integrated control system, characterized in that: The front subsystem includes a low-disturbance combined cutterhead (1) oriented towards the tunneling direction and a front shield cutterhead assembly (2); the low-disturbance combined cutterhead (1) is vertically divided into an upper row and a lower row, the upper cutterhead in the upper row includes a large cutterhead (101) located in the center, a middle cutterhead (102) is located on each side of the large cutterhead (101), and a small cutterhead (103) is located between the middle cutterhead (102) and the large cutterhead (101); the lower cutterhead in the lower row includes a... At the center of the cutter head (102), a large cutter head (101) is provided on each side of the cutter head (102); a set of foam nozzles (104) are evenly distributed on the upper and lower cutter heads; the main drive system is a redundant design, with reserved mounting holes for motor reducers, and is equipped with a motor adapted to the low-disturbance combined cutter head (1); the rear propulsion subsystem includes a modularly assembled propulsion frame and a constant thrust double-stroke hydraulic cylinder; the integrated control system includes an earth pressure measurement and control module and a guidance module; The front output shaft of the main drive system is connected to the front subsystem, and the rear input shaft of the main drive system is connected to the rear propulsion subsystem. The integrated control system is electrically or signal-connected to the main drive system, the front subsystem, and the rear propulsion subsystem, respectively. The front shield blade assembly (2) includes a cap support structure (201) provided on the upper part of the front shield blade and a shield blade (202) provided on the blind spot of the cutterhead. The modularly assembled propulsion frame includes support rings, and the support rings are provided in several groups, with each group of support rings arranged along the axial direction of the entire propulsion frame; The support ring is composed of several splicing pieces (301), two splicing pieces (301) are located above and below the support ring group respectively, two splicing pieces (301) are located on the left and right sides of the support ring group respectively, and the remaining splicing pieces (301) are respectively located at the four corners of the support ring group. The specific shape of the splicing piece (301) depends on its position. The inner arc surface of the splicing piece (301) has a number of axial fixing blocks (302) that are fixedly connected to it along the radial direction. The number of axial fixing blocks (302) are fixedly connected to a radial fixing block (304). The radial fixing block (304) is fixedly connected to radial connecting blocks (303) at both ends of the splicing piece (301) along the radial direction. Two adjacent splicing pieces (301) are fixedly connected by two radial connecting blocks (303) and bolts.

2. The equipment for constructing ultra-large cross-section rectangular pipe jacking in complex environments according to claim 1, characterized in that: The propulsion frame also includes several axial connectors (305), which are used to connect two adjacent support ring groups. The bottom of the axial connector (305) is provided with two grooves, which are respectively engaged with two radial fixing blocks (304) in the two support ring groups. Furthermore, the axial connector (305) is also connected to the radial fixing blocks (304) by bolts.

3. The equipment for constructing ultra-large cross-section rectangular pipe jacking in complex environments according to claim 1, characterized in that: Several equal-thrust double-stroke hydraulic cylinders (4) are evenly distributed on one axial end face of the propulsion frame and are fixedly connected thereto. The number of equal-thrust double-stroke hydraulic cylinders (4) depends on the area of ​​the axial end face of the splicing piece (301). The larger the area of ​​the axial end face of the splicing piece (301), the more equal-thrust double-stroke hydraulic cylinders (4) are installed on the splicing piece (301).

4. The equipment for constructing ultra-large cross-section rectangular pipe jacking in complex environments according to claim 2, characterized in that: The axial connector (305) includes a connecting rod (3051) and two buckles (3052), wherein the connecting rod (3051) is located between the two buckles (3052), and both buckles (3052) are rotatably connected to the connecting rod (3051). The buckles (3052) are provided with grooves for engaging with the radial fixing block (304).

5. The equipment for constructing ultra-large cross-section rectangular pipe jacking in complex environments according to claim 1, characterized in that: The earth pressure monitoring and control module includes two sets of screw conveyors and a set of evenly distributed earth pressure sensors.

6. The equipment for constructing ultra-large cross-section rectangular pipe jacking in complex environments according to claim 4, characterized in that: The guiding module includes a dual-axis inclinometer (601) mounted on a connecting rod (3051).

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