A dynamically partitionable synchronous push-assemble shield propulsion hydraulic system

Abstract

The application discloses a dynamic partitioned synchronous pushing and splicing shield propulsion hydraulic system, which comprises a pump station, a dynamic partition valve group and a propulsion system hydraulic cylinder group. The dynamic partition valve group is mainly composed of two-position three-way reversing valves and three-way proportional pressure reducing valves. The two-position three-way reversing valves are connected in series and parallel to adjust the partition and position of each group of propulsion hydraulic cylinders in real time. The three-way proportional pressure reducing valves are responsible for controlling the pressure and flow of each group of propulsion hydraulic cylinders. The propulsion system hydraulic cylinder group mainly comprises three-position four-way reversing valves, balance valves, unloading valves and propulsion hydraulic cylinders, and can stably withdraw the local propulsion hydraulic cylinders corresponding to the segment splicing position in the synchronous pushing and splicing state. The application has great application potential in realizing high reliability and high precision tunneling of the synchronous pushing and splicing shield.

Description

Technical Field

[0001] This invention relates to the field of synchronous tunnel boring machine (TBM) construction, and specifically to a dynamically zoned synchronous TBM propulsion hydraulic system. Background Technology

[0002] Currently, tunnel engineering is increasingly developing towards greater depth, larger cross-section, and longer distances, primarily manifested in long urban and intercity tunnels. Conventional shield tunneling involves excavating a ring of tunnel segments, then switching to a standstill to assemble the entire ring. Typically, the excavation and assembly processes take roughly equal time. Therefore, with these alternating processes, conventional shield tunneling results in excessively long project construction cycles for long (and ultra-long) tunnels. Synchronous push-and-assemble shield tunneling, which designs the excavation and assembly processes in parallel, is a key piece of tunneling equipment for improving tunnel construction efficiency. Its specific control mode is as follows: during synchronous push-and-assemble shield tunneling, the propulsion system needs to retract the corresponding hydraulic cylinders based on the segment assembly points, allowing the segment assembly machine to complete the segment assembly. Meanwhile, the remaining hydraulic cylinders in the propulsion system provide excavation power to the shield, thus achieving "synchronous push-and-assemble."

[0003] During synchronous shield tunneling, some hydraulic cylinders inevitably fail to provide thrust. To ensure precise tunneling along the designed axis, two main technical solutions are currently available: full hydraulic cylinder control and free zone control. While full hydraulic cylinder control improves overall system control accuracy, it suffers from significant throttling losses and high control costs. Free zone control typically requires multiple pressure sources to provide different pressures to each zone, but it remains within the fixed zone category, lacking flexibility. Furthermore, during shield tunneling, assembly points need to be determined based on axis deviation. As assembly points change, hydraulic cylinders on a segment within a ring may belong to different zones. Differences in zone pressure introduce overturning moments into the segments, significantly reducing the uniformity of stress on the segments. Therefore, to balance the control accuracy and cost of the propulsion hydraulic system while simultaneously meeting requirements such as local hydraulic cylinder retraction and uniform stress on segments, a dynamically zoned synchronous shield propulsion hydraulic system is urgently needed to ensure efficient and safe construction of long tunnels. Summary of the Invention

[0004] To address the aforementioned problems, this invention proposes a dynamically partitioned synchronous shield tunneling propulsion hydraulic system, specifically...

[0005] A synchronous push-and-assemble shield propulsion hydraulic system with dynamic partitioning includes a pump station, a dynamic partitioning valve group, and a hydraulic cylinder module;

[0006] The hydraulic cylinder module includes M hydraulic cylinder groups; it acts on an external ring segment and provides propulsion force; the ring segment includes a capping block and several other sub-blocks; one hydraulic cylinder group always acts on the capping block, and two hydraulic cylinder groups act on each of the other sub-blocks.

[0007] The dynamic zoning valve group is used to adjust the zoning area of ​​the hydraulic cylinder module; the dynamic zoning valve group includes N control valve groups and M zoning valve groups; the number of control valve groups is the same as the number of blocks in a ring segment; wherein the first control valve group always controls the pressure of the propulsion hydraulic cylinder corresponding to the capping block, and the remaining control valve groups control the pressure of the propulsion hydraulic cylinder corresponding to the remaining blocks; the number of zoning valve groups is the same as the number of hydraulic cylinder groups, and each zoning valve group is connected to one hydraulic cylinder group.

[0008] The pump station is used to supply pressurized oil to the dynamic zone valve group.

[0009] As a preferred embodiment of the present invention, the pump station includes an oil tank, an inlet filter, a first manual shut-off valve, a motor, a variable pump, a remote pressure regulating valve, a first safety valve, a second manual shut-off valve, a high-pressure filter, and a spring-loaded check valve; the oil tank is connected to the inlet of the variable pump through the inlet filter and the manual shut-off valve; the variable pump and the motor are connected through a coupling; the variable pump is equipped with a remote pressure regulating valve; the remote pressure regulating valve is connected to an external PLC controller to regulate the outlet pressure of the variable pump; the outlet of the variable pump is connected to the high-pressure filter through the second manual shut-off valve; the high-pressure filter is connected to a dynamic zone valve group through a spring-loaded check valve and a one-way throttle valve.

[0010] As a preferred embodiment of the present invention, the outlet of the variable pump is further provided with a pressure gauge, a pressure sensor and a first safety valve; the outlet pressure of the variable pump is monitored by the pressure gauge and the pressure sensor, and when the outlet pressure of the variable pump exceeds a set threshold, the first safety valve opens and the oil flows back to the oil tank through the safety return oil pipeline.

[0011] As a preferred embodiment of the present invention, the hydraulic cylinder assembly includes a three-position four-way directional valve, a balance valve, a cartridge valve, a cover plate, a two-position three-way directional valve, a propulsion hydraulic cylinder, an unloading valve, and a second safety valve; the propulsion hydraulic cylinder has a rodless chamber and a rod chamber.

[0012] The A port of the three-position four-way directional valve is connected to the balance valve, and the B port is connected to the rod chamber of the hydraulic cylinder; the outlet of the balance valve is connected to the rodless chamber of the hydraulic cylinder; the control port of the balance valve is connected to the rod chamber of the hydraulic cylinder; the cartridge valve is connected to the rodless chamber of the hydraulic cylinder; the A port of the two-position three-way directional valve is connected to the rodless chamber of the hydraulic cylinder through a cover plate; the cartridge valve is directly mounted on one side of the cover plate and connected to the P port of the two-position three-way directional valve through the cover plate; the B port of the two-position three-way directional valve is connected to the leakage oil passage; the inlets of the unloading valve and the second safety valve are both connected to the rodless chamber of the hydraulic cylinder; the pressure port of the dynamic partition valve group is connected to the three-position four-way directional valve; the three-position four-way directional valve is connected to the propulsion hydraulic cylinder.

[0013] As a preferred embodiment of the present invention, in the synchronous pushing and assembling state, the hydraulic cylinder group corresponding to the segment assembly position needs to be smoothly retracted, while other hydraulic cylinder groups are still in the pushing state.

[0014] When the hydraulic cylinder group in the propulsion state is switched to the right position, the P port of the three-position four-way directional valve is connected to the A port of the three-position four-way directional valve, and the T port of the three-position four-way directional valve is connected to the B port of the three-position four-way directional valve; at this time, the pressure oil enters the rodless chamber of the propulsion hydraulic cylinder through the balance valve; the return fluid is connected to the B port of the three-position four-way directional valve through the rod chamber of the propulsion hydraulic cylinder, and the T port of the three-position four-way directional valve is connected to the return fluid pipeline; the outlet of the balance valve is connected to the second safety valve to protect the propulsion hydraulic cylinder from overload.

[0015] When the three-position four-way directional valve in the retraction hydraulic cylinder group is switched to the left position, the P port of the three-position four-way directional valve is connected to the B port of the three-position four-way directional valve, and the T port of the three-position four-way directional valve is connected to the A port of the three-position four-way directional valve; at this time, the pressurized oil enters the rod chamber of the propulsion hydraulic cylinder; the return fluid is connected to the balance valve through the rodless chamber of the propulsion hydraulic cylinder, so that the propulsion hydraulic cylinder retracts quickly while ensuring smooth movement; before switching the three-position four-way directional valve, the unloading valve needs to be switched to the left position to reduce the pressure in the rodless chamber of the propulsion hydraulic cylinder and avoid vibration of the propulsion system due to excessive oil pressure;

[0016] During the above adjustment process, the 2-position 3-way directional valve always remains in the left position. At this time, the control port C of the cartridge valve is connected to the port A of the 2-position 3-way directional valve through the port P of the 2-position 3-way directional valve, which is in a high-pressure state, i.e., the valve port is always closed. Only when the balance valve in the retraction hydraulic cylinder group malfunctions and cannot return fluid normally, the 2-position 3-way directional valve switches to the right position. At this time, the control port C of the cartridge valve is connected to the port B of the 2-position 3-way directional valve through the port P of the 2-position 3-way directional valve, which is connected to the leakage oil passage, and the valve port opens. The return fluid flows into the port B of the cartridge valve and exits from the port A of the cartridge valve.

[0017] In a preferred embodiment of the present invention, each zone valve group is composed of two two-position three-way directional valves connected in series; the two two-position three-way directional valves are identical, each having a P port, a T port, and an A port; the two two-position three-way directional valves are specifically divided into an upper two-position three-way directional valve and a lower two-position three-way directional valve, and the T port of the upper two-position three-way directional valve of each zone valve group is connected to the A port of the lower two-position three-way directional valve; the upper two-position three-way directional valves of all zone valve groups are connected in parallel, and the P port of the upper two-position three-way directional valve is connected to the B port of the first control valve group;

[0018] All the lower two-position three-way directional valves of the zone valve group are connected in parallel; starting from the first zone valve group, the T port of the lower two-position three-way directional valve of the first zone valve group is connected to the T port of the lower two-position three-way directional valve of the second zone valve group; the T port of the lower two-position three-way directional valve of the third zone valve group is connected to the T port of the lower two-position three-way directional valve of the fourth zone valve group, until the T port of the lower two-position three-way directional valve of the (M-2)th zone valve group is connected to the T port of the lower two-position three-way directional valve of the (M-1)th zone valve group;

[0019] Starting from the second zone valve group, the P port of the lower two-position three-way directional valve of the second zone valve group is connected to the P port of the lower two-position three-way directional valve of the third zone valve group; the P port of the lower two-position three-way directional valve of the fourth zone valve group is connected to the P port of the lower two-position three-way directional valve of the fifth zone valve group, until the P port of the lower two-position three-way directional valve of the (M-1)th zone valve group is connected to the P port of the lower two-position three-way directional valve of the Mth zone valve group;

[0020] The P port of the lower two-position three-way directional valve of the first zone valve group is connected to the T port of the lower two-position three-way directional valve of the M zone valve group.

[0021] As a preferred embodiment of the present invention, the B port of the first control valve group is connected to the P port of the upper two-position three-way directional valve of each zone valve group; the B port of the second control valve group is connected to the lower two-position three-way directional valve of the first, second, and third zone valve groups; the B port of the third control valve group is connected to the lower two-position three-way directional valve of the third, fourth, and fifth zone valve groups; and the B port of the Nth control valve group is connected to the lower two-position three-way directional valve of the (M-2), (M-1), and M zone valve groups.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1) The propulsion hydraulic system proposed in this invention uses the number of segments in a ring as the number of zones. Compared with fixed zones, the increase in controllable input effectively improves the control accuracy of the propulsion system. Compared with full hydraulic control, the control difficulty will be greatly reduced, and the dual requirements of control cost and control accuracy of the shield propulsion system are well balanced.

[0024] 2) This invention utilizes the series-parallel combination of two-position three-way reversing valves to enable the dynamic adjustment of the propulsion system's zonal distribution position according to the segment assembly point, effectively avoiding the overturning moment introduced by the zonal pressure difference, thereby ensuring the uniformity of thrust distribution for each segment.

[0025] 3) Due to the synchronous push-and-assemble working mode, the propulsion hydraulic cylinder needs to retract frequently. This invention effectively ensures the smoothness and reliability of the hydraulic cylinder's retraction process by connecting the balance valve and the cartridge valve in parallel. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of a synchronously pushed shield propulsion hydraulic system that can be dynamically partitioned.

[0027] Figure 2 This is a schematic diagram of a pumping station.

[0028] Figure 3 This is a schematic diagram of a dynamic zoned valve assembly.

[0029] Figure 4 This is a schematic diagram of a hydraulic cylinder module.

[0030] Figure 5 This is a schematic diagram of a hydraulic cylinder assembly.

[0031] Figure 6 This is a partition diagram with 5 partitions and 3 blocks as an example.

[0032] Figure 7 This is a schematic diagram of a dynamic partition valve group with 5 zones and 3 blocks as an example. Detailed Implementation

[0033] The present invention will be further described and illustrated below with reference to specific embodiments. The embodiments described are merely examples of the content of this disclosure and do not limit the scope of the invention. The technical features of each embodiment in the present invention can be combined accordingly, provided that there is no mutual conflict.

[0034] The overall diagram of the dynamically partitioned propulsion hydraulic system designed for synchronous tunnel boring machine assembly is as follows: Figure 1 As shown, it mainly includes a pump station 1, a dynamic zone valve group 2, and a hydraulic cylinder module 3.

[0035] like Figure 2As shown, in a specific embodiment of the present invention, pump station 1 includes an oil tank 11, an inlet filter 12, a manual shut-off valve 13, a motor 14, a variable displacement pump 15, a remote pressure regulating valve 16, a pressure gauge 17, a pressure sensor 18, a safety valve 19, a manual shut-off valve 110, a high-pressure filter 111, and a spring-loaded check valve 112. The oil tank 11 is connected to the variable displacement pump 15 via the inlet filter 12 and the manual shut-off valve 13. The variable displacement pump 15 is connected to the motor 14 via a coupling. The variable displacement pump 15 is equipped with a remote pressure regulating valve 16, which is connected to a PLC controller to regulate the outlet pressure of the variable displacement pump 15. When the outlet pressure of the variable displacement pump 15 exceeds a set threshold, the safety valve 19 opens, and the oil flows back to the oil tank through the safety return line. The outlet pressure of the variable displacement pump 15 is monitored by the pressure gauge 17 and the pressure sensor 18. The variable displacement pump 15 is connected to the high-pressure filter 111 via a manual shut-off valve 110 to further filter the hydraulic oil. The high-pressure oil is then delivered to the dynamic zone valve group 2 via a spring-loaded check valve 112 and a one-way throttle valve 113. The one-way throttle valve 113 is used to regulate the flow rate during the tunnel boring machine's advance.

[0036] The dynamic partitioning method proposed in this invention can adapt to propulsion hydraulic systems with different numbers of partitions and different numbers of hydraulic cylinders. For ease of explanation, it will be described below as M partitions and N hydraulic cylinder groups.

[0037] like Figure 4 As shown, the number of control valve assemblies is the same as the number of segments in one ring of pipe. One hydraulic cylinder assembly always operates on the top segment, while two hydraulic cylinder assemblies operate on the remaining segments. Each control valve assembly has the same composition and connection method, and is only responsible for regulating the pressure of the hydraulic cylinder assembly acting on one segment. The first control valve assembly always controls the pressure of the hydraulic cylinder assembly corresponding to the top segment, while the other control valve assemblies control the pressure of the hydraulic cylinder assemblies corresponding to the remaining segments.

[0038] The number of zone valve groups is the same as the number of hydraulic cylinder groups. Each hydraulic cylinder group in the propulsion system is connected to a zone valve group. For example, the first hydraulic cylinder group is connected to the first zone valve group.

[0039] To allow the hydraulic system's partitioned areas to change with the position of the capping block, the partitioning of the hydraulic cylinder modules is primarily manifested in that any two adjacent hydraulic cylinder groups can be located within the same partition. For example, the first and second hydraulic cylinder groups are in the same partition, the second and third hydraulic cylinder groups are in the same partition, the (M-1)th and the Mth hydraulic cylinder groups are in the same partition, and the first and Mth hydraulic cylinder groups are in the same partition.

[0040] Each zone valve group contains two 2-position 3-way directional valves connected in series. Each 2-position 3-way directional valve is identical, possessing a P port, a T port, and an A port. The upper 2-position 3-way directional valves in all zone valve groups are connected in parallel, with their P ports all connected to the B port of the first control valve group. The T port of each upper 2-position 3-way directional valve in each zone valve group is connected to the A port of the lower 2-position 3-way directional valve.

[0041] All lower-position 2-way 3-way directional valves in all zone valve groups are connected in parallel. Starting with the first zone valve group, the T-port of the lower-position 2-way 3-way directional valve in the first zone valve group is connected to the T-port of the lower-position 2-way 3-way directional valve in the second zone valve group. The T-port of the lower-position 2-way 3-way directional valve in the third zone valve group is connected to the T-port of the lower-position 2-way 3-way directional valve in the fourth zone valve group. And so on, the T-port of the lower-position 2-way 3-way directional valve in the (M-2)th zone valve group is connected to the T-port of the lower-position 2-way 3-way directional valve in the (M-1)th zone valve group.

[0042] Starting with the second zone valve group, the P port of the lower 2-position 3-way directional valve in the second zone valve group is connected to the P port of the lower 2-position 3-way directional valve in the third zone valve group. The P port of the lower 2-position 3-way directional valve in the fourth zone valve group is connected to the P port of the lower 2-position 3-way directional valve in the fifth zone valve group. And so on, with the P port of the lower 2-position 3-way directional valve in the (M-1)th zone valve group connected to the P port of the lower 2-position 3-way directional valve in the Mth zone valve group.

[0043] The P port of the lower two-position three-way directional valve of the first zone valve group is connected to the T port of the lower two-position three-way directional valve of the M zone valve group.

[0044] Port B of the first control valve group is connected to port P of the upper 2-position 3-way directional valve of each zone valve group. Port B of the second control valve group is connected to the lower 2-position 3-way directional valves of the first, second, and third zone valve groups. Port B of the third control valve group is connected to the lower 2-position 3-way directional valves of the third, fourth, and fifth zone valve groups. And so on, with port B of the Nth control valve group connected to the lower 2-position 3-way directional valves of the (M-2), (M-1), and Mth zone valve groups.

[0045] Specifically, starting with the third control valve group, except for the second control valve group, the B port of the third control valve group is connected to the T port of the lower two-position three-way directional valve of the third zone valve group, the T port of the lower two-position three-way directional valve of the fourth zone valve group, the P port of the lower two-position three-way directional valve of the fourth zone valve group, and the P port of the lower two-position three-way directional valve of the fifth zone valve group. Similarly, the B port of the Nth control valve group is connected to the T port of the lower two-position three-way directional valve of the (M-2)th zone valve group, the T port of the lower two-position three-way directional valve of the (M-1)th zone valve group, the P port of the lower two-position three-way directional valve of the (M-1)th zone valve group, and the P port of the lower two-position three-way directional valve of the Mth zone valve group.

[0046] The connection method of the second control valve group is similar to that of the third control valve group. In addition to connecting its B port to the T port of the lower two-position three-way directional valve of the first zone valve group, the T port of the lower two-position three-way directional valve of the second zone valve group, the P port of the lower two-position three-way directional valve of the second zone valve group, and the P port of the lower two-position three-way directional valve of the third zone valve group, it also needs to connect to the P port of the lower two-position three-way directional valve of the first zone valve group and the T port of the lower two-position three-way directional valve of the Mth zone valve group.

[0047] by Figure 6 and Figure 7 Taking the illustrated working condition as an example, the dynamically partitioned propulsion hydraulic system proposed in this invention has a total of 3 control valve groups, which control 3 partitions respectively. Partition 1, partition 2 and partition 3 are completely identical.

[0048] The oil outlet B3 of section 1 is connected to ports 27A, 29A, 211A, 213A, and 215A of the two-position three-way directional valves b27, d29, f211, h213, and j215, respectively. The oil outlet B4 of section 2 is connected to ports 26A, 26B, 28A, 28B, 210A, and 214B of the two-position three-way directional valves a26, c28, e210, and i214, respectively. The oil outlet B5 of section 3 is connected to ports 210B, 212A, 212B, and 214A of the two-position three-way directional valves e210, g212, and i214, respectively.

[0049] Port 26C of 2-position 3-way directional valve a26 is connected to port 27B of 2-position 3-way directional valve b27. Port 28C of 2-position 3-way directional valve c28 is connected to port 29B of 2-position 3-way directional valve d29. Port 210C of 2-position 3-way directional valve e210 is connected to port 211B of 2-position 3-way directional valve f211. Port 212C of 2-position 3-way directional valve g212 is connected to port 213B of 2-position 3-way directional valve h213. Port 214C of 2-position 3-way directional valve i214 is connected to port 215B of 2-position 3-way directional valve j215.

[0050] Cartridge valve 33 is connected to 2-position 3-way directional valve 35. Control port 33C of cartridge valve 33 is connected to 35P. When 2-position 3-way directional valve 35 is in the right position, control port 33C is connected to the main oil circuit C1 via 35A. At this time, cartridge valve 33 is closed. Pressure oil enters the 3-way proportional pressure reducing valve 32 and flows out from the check valve 31. At this time, the propulsion hydraulic system is in pressure-regulating propulsion mode. When 2-position 3-way directional valve 35 is energized, the control port of cartridge valve 33 connects to the oil tank. At this time, pressure oil enters 33B and flows out from 33A. At this time, the propulsion hydraulic system is in rapid propulsion mode.

[0051] The pressure ports B6-B10 of the dynamic partition valve group 2 are connected to the C1-C5 ports of the hydraulic cylinder module 3, respectively. The dynamic partitioning process mainly relies on the combined action of the two-position three-way directional valve in the dynamic partition valve group 2.

[0052] The implementation of dynamic zoning relies on the combined use of 10 two-position three-way directional valves in the dynamic zoning valve group. To illustrate this process, this invention uses an example of a propulsion system comprising 5 hydraulic cylinder groups and a ring segment comprising 3 sections. Dynamic zoning essentially involves adjusting the zoning of each hydraulic cylinder group according to the position of the capping block, ensuring that each segment corresponds to one zoning. For this example, the propulsion system can be divided into 5 cases, such as... Figure 6 As shown.

[0053] When hydraulic cylinder group 1 and hydraulic cylinder group 2 are in the same partition, the two-position three-way directional valves A26 and C28 need to be switched to the left position; when hydraulic cylinder group 2 and hydraulic cylinder group 3 are in the same partition, the two-position three-way directional valves C28 and E210 remain in the right position; when hydraulic cylinder group 3 and hydraulic cylinder group 4 are in the same partition, the two-position three-way directional valves E210 and G212 need to be switched to the left position; when hydraulic cylinder group 4 and hydraulic cylinder group 5 are in the same partition, the two-position three-way directional valves G212 and I214 remain in the right position; when hydraulic cylinder group 1 and hydraulic cylinder group 5 are in the same partition, the two-position three-way directional valve A26 remains in the right position, and the two-position three-way directional valve I214 needs to be switched to the left position.

[0054] Once the position of the capping block is determined, the two 2-position 3-way directional valves in the corresponding zone valve group remain in the right position, while all the upper 2-position 3-way directional valves in the remaining zone valve groups need to be switched to the left position. For example, when hydraulic cylinder group 1 is the capping block zone, 2-position 3-way directional valves a26 and b27 remain in the right position, while 2-position 3-way directional valves d29, f211, h213, and j215 need to be switched to the left position.

[0055] When hydraulic cylinder group 1 is used as the capping block, hydraulic cylinder group 2 and hydraulic cylinder group 3 are in the same partition, and hydraulic cylinder group 4 and hydraulic cylinder group 5 are in the same partition.

[0056] At this time, the two-position three-way directional valves a26, b27, c28, e210, g212, and i214 are still in the right position. The oil outlet B3 of section 1 is connected to the two-position three-way directional valve b27, with oil flowing in from port 27A and out from port 27C, entering the inlet C1 of hydraulic cylinder group 1. The oil outlet B4 of section 2 is connected to port 28A of the two-position three-way directional valve c28 and port 210A of the two-position three-way directional valve e210, and then connected from ports 28C and 210C to ports 29B of the two-position three-way directional valve d29 and 211B of the two-position three-way directional valve f211. When the two-position three-way directional valves d29 and f211 are switched to the left position, pressurized oil flows out from ports 29C and 211C, respectively, and enters the inlet C2 of hydraulic cylinder group 2 and the inlet C3 of hydraulic cylinder group 3. Port B5 of section 3 is connected to port 212A of the two-position three-way directional valve g212 and port 214A of the two-position three-way directional valve i214, and then from ports 212C and 214C to ports 213B of the two-position three-way directional valve h213 and 215B of the two-position three-way directional valve j215. When the two-position three-way directional valves h213 and j215 are switched to the left position, pressurized oil flows out from ports 213C and 215C, respectively, and enters the inlet C4 of hydraulic cylinder group 4 and the inlet C5 of hydraulic cylinder group 5. By switching the state of the two-position three-way directional valve, hydraulic cylinder group 1 is controlled by partition 1, hydraulic cylinder group 2 and hydraulic cylinder group 3 are controlled by partition 2, and hydraulic cylinder group 4 and hydraulic cylinder group 5 are controlled by partition 3.

[0057] When hydraulic cylinder group 2 is used as the capping block, hydraulic cylinder groups 1 and 5 are in the same partition, and hydraulic cylinder groups 3 and 4 are in the same partition. At this time, the two-position three-way directional valves a26, c28, and d29 are still in the right position, while the two-position three-way directional valves e210, g212, and i214 are switched to the left position. The oil outlet B3 of partition 1 is connected to the two-position three-way directional valve d29, with oil flowing in from 29A and out from 29C, entering the oil inlet C2 of hydraulic cylinder group 2. The oil outlet B4 of section 2 is connected to port 26A of the two-position three-way directional valve a26 and port 214B of the two-position three-way directional valve i214, respectively. Ports 26C and 214C are then connected to ports 27B of the two-position three-way directional valve b27 and port 215B of the two-position three-way directional valve j215. When the two-position three-way directional valves b27 and j215 are switched to the left position, pressurized oil flows out from ports 27C and 215C, entering the inlet C1 of hydraulic cylinder group 1 and the inlet C5 of hydraulic cylinder group 5, respectively. The oil outlet B5 of section 3 is connected to port 210B of the two-position three-way directional valve e210 and port 212B of the two-position three-way directional valve g212, respectively. Ports 210C and 212C are then connected to ports 211B of the two-position three-way directional valve f211 and port 213B of the two-position three-way directional valve h213. When the two-position three-way directional valves f211 and h213 are switched to the left position, pressurized oil flows out from ports 211C and 213C, entering the inlet C3 of hydraulic cylinder group 3 and the inlet C4 of hydraulic cylinder group 4, respectively. Through the state switching of the two-position three-way directional valves, hydraulic cylinder group 2 is controlled independently by section 1, hydraulic cylinder groups 1 and 5 are controlled by section 2, and hydraulic cylinder groups 3 and 4 are controlled by section 3.

[0058] Similarly, when 3, 4, and 5 are the capping blocks, the state switching of the two-position three-way directional valve can be achieved.

[0059] Hydraulic cylinder group 1, hydraulic cylinder group 2, hydraulic cylinder group 3, hydraulic cylinder group 4 and hydraulic cylinder group 5 are completely identical.

[0060] In synchronous assembly mode, the hydraulic cylinder group corresponding to the segment assembly position needs to retract smoothly, while other hydraulic cylinder groups remain in the advancing state. The working principle is explained using hydraulic cylinder group 1 as an example. Figure 5 As shown, the pressure port C1 of the dynamic partition valve group 2 is connected to the 31P port of the three-position four-way directional valve 31.

[0061] When the three-position four-way directional valve 31 is switched to the right position, 31P is connected to 31A, and 31T is connected to 31B. At this time, the hydraulic cylinder group 1 is in the advancing state. Pressurized oil enters the rodless chamber 36A of the advancing hydraulic cylinder 36 through the balance valve 32. The return fluid is connected to the 31B port of the three-position four-way valve 31 through the rod chamber 36B of the advancing hydraulic cylinder 36, and connected to the return line C6 through the 31T port. The outlet of the balance valve 32 is connected to the safety valve 38 to protect the advancing hydraulic cylinder 36 from overload.

[0062] When the three-position four-way directional valve 31 is switched to the left position, 31P and 31B are connected, and 31T and 31A are connected. At this time, hydraulic cylinder group 1 is in the retracted state. Pressurized oil enters the rod chamber 36B of the propulsion hydraulic cylinder 36. The return fluid is connected to the balance valve 32 through the rodless chamber 36A of the propulsion hydraulic cylinder 36, so that the propulsion hydraulic cylinder 36 retracts quickly while ensuring smooth movement. Before switching the three-position four-way directional valve 32, the unloading valve 37 needs to be switched to the left position to reduce the pressure in the rodless chamber of the propulsion hydraulic cylinder 36 and avoid vibration of the propulsion system due to excessive oil pressure.

[0063] During the above adjustment process, the two-position three-way directional valve 35 always remains in the left position. At this time, the control port 33C of the cartridge valve 33 is connected to 35A through 35P, which is a high-pressure state, meaning the valve port is always closed. Only in the retraction state, when the balance valve 32 malfunctions and cannot return fluid normally, the two-position three-way directional valve 35 switches to the right position. At this time, the control port 33C of the cartridge valve 33 is connected to 35B through 35P, which is connected to the leakage oil channel, and the valve port opens. The return fluid flows into 33B and flows out from 33A to the B11 port of the dynamic partition valve group 2. Under the synchronous push-and-assemble method, the retraction of the propulsion hydraulic cylinder corresponding to the segment assembly position is the key to the synchronous execution of the propulsion and assembly processes. This invention increases the redundancy of the propulsion hydraulic cylinder return pipeline by connecting the cartridge valve 33 and the balance valve 32 in parallel, effectively improving the reliability of the propulsion hydraulic system during the partial hydraulic cylinder retraction process and ensuring the normal operation of the synchronous push-and-assemble process.

[0064] The propulsion hydraulic system proposed in this invention can be used not only for synchronous tunnel boring machines (TBMs) but also for traditional TBMs, with particularly superior performance in the construction of ultra-large diameter tunnels. In synchronous tunneling operation, the retraction of some propulsion hydraulic cylinders can be achieved through a three-position four-way directional valve 31. In the traditional push-then-assemble operation, the three-position four-way directional valves of all hydraulic cylinder groups operate simultaneously, enabling the retraction of all propulsion hydraulic cylinders.

[0065] Before entering the "synchronous pushing and assembling" working state, the synchronous pushing and assembling shield tunnel needs to excavate a distance equal to the width of one ring segment in the "full hydraulic cylinder" working mode.

[0066] The above-described embodiments are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. Those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A dynamically partitioned synchronous push-and-assemble shield tunneling hydraulic system, characterized in that, It includes a pump station (1), a dynamic zone valve group (2), and a hydraulic cylinder module (3); The hydraulic cylinder module (3) includes M hydraulic cylinder groups; it acts on an external ring segment and provides propulsion force; the ring segment includes a capping block and several other sub-blocks; a hydraulic cylinder group always acts on the capping block, and two hydraulic cylinder groups act on each of the other sub-blocks; The hydraulic cylinder assembly includes a three-position four-way directional valve (31), a balance valve (32), a cartridge valve (33), a cover plate (34), a two-position three-way directional valve (35), a propulsion hydraulic cylinder (36), an unloading valve (37), and a second safety valve (38); the propulsion hydraulic cylinder (36) has a rodless hydraulic cylinder chamber and a rod hydraulic cylinder chamber. The A port of the three-position four-way directional valve (31) is connected to the balance valve (32), and the B port is connected to the rod chamber of the hydraulic cylinder; the outlet of the balance valve (32) is connected to the rodless chamber of the hydraulic cylinder; the control port of the balance valve (32) is connected to the rod chamber of the hydraulic cylinder; the cartridge valve (33) is connected to the rodless chamber of the hydraulic cylinder; the A port of the two-position three-way directional valve (35) is connected to the rodless chamber of the hydraulic cylinder through the cover plate (34); the cartridge valve (33) is directly installed on one side of the cover plate (34) and connected to the P port of the two-position three-way directional valve (35) through the cover plate (34); the B port of the two-position three-way directional valve (35) is connected to the leakage oil passage; the inlet ports of the unloading valve (37) and the second safety valve (38) are both connected to the rodless chamber of the hydraulic cylinder; the pressure port of the dynamic partition valve group is connected to the three-position four-way directional valve (31); the three-position four-way directional valve (31) is connected to the propulsion hydraulic cylinder (36); The dynamic partition valve group (2) is used to adjust the partition area of ​​the hydraulic cylinder module (3); the dynamic partition valve group (2) includes N control valve groups and M partition valve groups; the number of control valve groups is the same as the number of blocks of a ring segment; wherein the first control valve group always controls the pressure of the propulsion hydraulic cylinder corresponding to the capping block, and the other control valve groups control the pressure of the propulsion hydraulic cylinder corresponding to the other blocks; the number of partition valve groups is the same as the number of hydraulic cylinder groups, and each partition valve group is connected to a hydraulic cylinder group. The pump station (1) is used to supply pressurized oil to the dynamic zone valve group (2).

2. The synchronous push-and-assemble shield tunneling hydraulic system according to claim 1, characterized in that, The pump station (1) includes an oil tank (11), an inlet filter (12), a first manual shut-off valve (13), a motor (14), a variable pump (15), a remote pressure regulating valve (16), a first safety valve (19), a second manual shut-off valve (110), a high-pressure filter (111), and a spring-loaded check valve (112). The oil tank (11) is connected to the inlet of the variable pump (15) through the inlet filter (12) and the first manual shut-off valve (13). The variable pump (15) is connected to the motor (14) through a coupling. The variable pump (15) is equipped with a remote pressure regulating valve (16). The remote pressure regulating valve (16) is connected to an external PLC controller to regulate the outlet pressure of the variable pump (15). The outlet of the variable pump (15) is connected to the high-pressure filter (111) through the second manual shut-off valve (110). The high-pressure filter (111) is connected to the dynamic partition valve group (2) through the spring-loaded check valve (112) and the one-way throttle valve (113).

3. The synchronous pushing and splicing shield tunneling hydraulic system according to claim 2, characterized in that, The outlet of the variable pump (15) is also equipped with a pressure gauge (17), a pressure sensor (18) and a first safety valve (19); the outlet pressure of the variable pump (15) is monitored by the pressure gauge (17) and the pressure sensor (18). When the outlet pressure of the variable pump (15) exceeds the set threshold, the first safety valve (19) opens and flows back to the oil tank through the safety return oil pipeline.

4. The synchronous push-and-assemble shield tunneling hydraulic system according to claim 1, characterized in that, In the synchronous pushing and assembling state, the hydraulic cylinder group corresponding to the segment assembly position needs to be smoothly retracted, while the other hydraulic cylinder groups are still in the pushing state; In the hydraulic cylinder group in the propulsion state, the three-position four-way directional valve (31) is switched to the right position. The P port of the three-position four-way directional valve (31) is connected to the A port of the three-position four-way directional valve (31), and the T port of the three-position four-way directional valve (31) is connected to the B port of the three-position four-way directional valve (31). At this time, the pressure oil enters the rodless chamber of the propulsion hydraulic cylinder (36) through the balance valve (32). The return fluid is connected to the B port of the three-position four-way directional valve (31) through the rod chamber of the propulsion hydraulic cylinder (36), and the T port of the three-position four-way directional valve (31) is connected to the return fluid pipeline (C6). The outlet of the balance valve (32) is connected to the second safety valve (38) to protect the propulsion hydraulic cylinder (36) from overload. When the three-position four-way directional valve (31) in the retraction hydraulic cylinder group is switched to the left position, the P port of the three-position four-way directional valve (31) is connected to the B port of the three-position four-way directional valve (31), and the T port of the three-position four-way directional valve (31) is connected to the A port of the three-position four-way directional valve (31); at this time, the pressure oil enters the rod chamber of the propulsion hydraulic cylinder (36); the return fluid is connected to the balance valve (32) through the rodless chamber of the propulsion hydraulic cylinder (36), so that the propulsion hydraulic cylinder (36) can retract quickly while ensuring smooth movement; before the three-position four-way directional valve (31) is switched, the unloading valve (37) needs to be switched to the left position to reduce the pressure of the rodless chamber of the propulsion hydraulic cylinder (36) and avoid vibration of the propulsion system due to excessive oil pressure; During the above adjustment process, the two-position three-way directional valve (35) always remains in the left position. At this time, the control port C of the cartridge valve (33) is connected to the A port of the two-position three-way directional valve (35) through the P port of the two-position three-way directional valve (35), which is a high-pressure state, that is, the valve port is always closed. Only when the balance valve (32) in the retraction hydraulic cylinder group fails and cannot return fluid normally, the two-position three-way directional valve (35) switches to the right position. At this time, the control port C of the cartridge valve (33) is connected to the B port of the two-position three-way directional valve (35) through the P port of the two-position three-way directional valve (35), which is connected to the leakage oil passage, and the valve port is opened. The return fluid flows into the B port of the cartridge valve (33) and flows out from the A port of the cartridge valve (33).

5. The synchronous pushing and splicing shield tunneling hydraulic system according to claim 1, characterized in that, Each zone valve group is composed of two 2-position 3-way directional valves connected in series. The two 2-position 3-way directional valves are identical, each having a P port, a T port, and an A port. The two 2-position 3-way directional valves are specifically divided into an upper 2-position 3-way directional valve and a lower 2-position 3-way directional valve. The T port of the upper 2-position 3-way directional valve in each zone valve group is connected to the A port of the lower 2-position 3-way directional valve. The upper 2-position 3-way directional valves of all zone valve groups are connected in parallel, and the P port of the upper 2-position 3-way directional valve is connected to the B port of the first control valve group. All the lower two-position three-way directional valves of the zone valve group are connected in parallel; starting from the first zone valve group, the T port of the lower two-position three-way directional valve of the first zone valve group is connected to the T port of the lower two-position three-way directional valve of the second zone valve group; the T port of the lower two-position three-way directional valve of the third zone valve group is connected to the T port of the lower two-position three-way directional valve of the fourth zone valve group, until the T port of the lower two-position three-way directional valve of the (M-2)th zone valve group is connected to the T port of the lower two-position three-way directional valve of the (M-1)th zone valve group; Starting from the second zone valve group, the P port of the lower two-position three-way directional valve of the second zone valve group is connected to the P port of the lower two-position three-way directional valve of the third zone valve group; the P port of the lower two-position three-way directional valve of the fourth zone valve group is connected to the P port of the lower two-position three-way directional valve of the fifth zone valve group, until the P port of the lower two-position three-way directional valve of the (M-1)th zone valve group is connected to the P port of the lower two-position three-way directional valve of the Mth zone valve group; The P port of the lower two-position three-way directional valve of the first zone valve group is connected to the T port of the lower two-position three-way directional valve of the M zone valve group.

6. The synchronous pushing and splicing shield tunneling hydraulic system according to claim 5, characterized in that, The B port of the first control valve group is connected to the P port of the upper two-position three-way directional valve of each zone valve group; the B port of the second control valve group is connected to the lower two-position three-way directional valve of the first, second, and third zone valve groups; the B port of the third control valve group is connected to the lower two-position three-way directional valve of the third, fourth, and fifth zone valve groups; and the B port of the Nth control valve group is connected to the lower two-position three-way directional valve of the (M-2), (M-1), and M zone valve groups.

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