CN-116856942-B - Dynamic zoning synchronous pushing and splicing shield pushing hydraulic system

CN116856942BCN 116856942 BCN116856942 BCN 116856942BCN-116856942-B

Abstract

The invention discloses a dynamic zoned synchronous pushing and splicing shield propulsion hydraulic system which comprises a pump station, a dynamic zoned valve group and a propulsion system hydraulic cylinder group. The dynamic partition valve group mainly comprises a two-position three-way reversing valve and a three-way proportional pressure reducing valve. The two-position three-way reversing valve adjusts the subordinate subareas and subarea positions of each group of propelling hydraulic cylinders in real time in a serial-parallel mode. The three-way proportional pressure reducing valve is responsible for regulating and controlling the pressure and flow of each subarea propelling hydraulic cylinder, and the propelling system hydraulic cylinder group mainly comprises a three-position four-way reversing valve, a balance valve, an unloading valve and a propelling hydraulic cylinder, so that the local propelling hydraulic cylinders corresponding to the segment assembling positions can be stably retracted under the synchronous pushing and assembling state. The invention has great application potential in the aspect of realizing high-reliability and high-precision tunneling of the synchronous push-splice shield.

Inventors

HAN DONG
ZHENG ZHE
TAN XIANZHONG
JIA LIANHUI
JIANG LIJIE
XIE HAIBO
GONG GUOFANG
YANG HUAYONG

Assignees

浙江大学

Dates

Publication Date: 20260508
Application Date: 20230626

Claims (6)

1. The synchronous pushing and splicing shield propulsion hydraulic system capable of being dynamically partitioned is characterized by comprising a pump station (1), a dynamic partition valve group (2) and a hydraulic cylinder module (3); The hydraulic cylinder module (3) comprises M hydraulic cylinder groups, a ring pipe piece and a plurality of hydraulic cylinder groups, wherein the M hydraulic cylinder groups are acted on the external ring pipe piece and provide propelling force; The hydraulic cylinder group comprises a three-position four-way reversing valve (31), a balance valve (32), a cartridge valve (33), a cover plate (34), a two-position three-way reversing valve (35), a pushing hydraulic cylinder (36), an unloading valve (37) and a second safety valve (38), wherein a hydraulic cylinder rodless cavity and a hydraulic cylinder rod cavity are arranged in the pushing hydraulic cylinder (36); The three-position four-way reversing valve (31) comprises an A port and a balance valve (32), a B port and a hydraulic cylinder rod cavity, wherein an outlet of the balance valve (32) is connected to a hydraulic cylinder rod-free cavity, a control oil port of the balance valve (32) is connected to the hydraulic cylinder rod-free cavity, a cartridge valve (33) is connected with the hydraulic cylinder rod-free cavity, an A port of a two-position three-way reversing valve (35) is connected with the hydraulic cylinder rod-free cavity through a cover plate (34), the cartridge valve (33) is directly arranged on one side of the cover plate (34) and is connected to a P port of the two-position three-way reversing valve (35) through the cover plate (34), the B port of the two-position three-way reversing valve (35) is connected with a leakage oil channel, oil inlets of an unloading valve (37) and a second safety valve (38) are both connected with the hydraulic cylinder rod-free cavity, a pressure oil port of a dynamic partition valve is connected to the three-position four-way reversing valve (31), and the three-position four-way reversing valve (31) is communicated with a propulsion hydraulic cylinder (36); The dynamic partition valve group (2) is used for adjusting the partition area of the hydraulic cylinder module (3), the dynamic partition valve group (2) comprises N control valve groups and M partition valve groups, the number of the control valve groups is the same as that of the partitions of a ring of pipe pieces, wherein a first control valve group always controls the pressure of a pushing hydraulic cylinder corresponding to a jacking block, and other control valve groups control the pressure of the pushing hydraulic cylinder corresponding to other partitions; the pump station (1) is used for providing pressure oil for the dynamic partition valve group (2).
2. The synchronous pushing and splicing shield propulsion hydraulic system according to claim 1, wherein the pump station (1) comprises an oil tank (11), an oil inlet filter (12), a first manual stop valve (13), a motor (14), a variable pump (15), a remote pressure regulating valve (16), a first safety valve (19), a second manual stop valve (110), a high-pressure filter (111) and a spring type check valve (112), the oil tank (11) is connected to an inlet of the variable pump (15) through the oil inlet filter (12) and the first manual stop valve (13), the variable pump (15) is connected with the motor (14) through a coupler, a remote pressure regulating valve (16) is arranged on the variable pump (15), the remote pressure regulating valve (16) is connected with an external PLC (PLC) to regulate the outlet pressure of the variable pump (15), an outlet of the variable pump (15) is connected to the high-pressure filter (111) through the second manual stop valve (110), and the high-pressure filter (111) is connected with the dynamic partition (2) through the spring type check valve (112) and the check valve (113).
3. The synchronous push-splice shield propulsion hydraulic system according to claim 2, wherein the outlet of the variable pump (15) is further provided 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), and when the outlet pressure of the variable pump (15) exceeds a set threshold value, the first safety valve (19) is opened and returns to the oil tank through a safety return line.
4. The synchronous push shield thrust hydraulic system of claim 1 wherein, In the synchronous pushing and splicing state, the hydraulic cylinder groups corresponding to the pipe piece splicing positions are required to be stably retracted, and other hydraulic cylinder groups are still in a pushing state; The three-position four-way reversing valve (31) in the hydraulic cylinder group in a propelling state is switched to the right position, the P port of the three-position four-way reversing valve (31) is communicated with the A port of the three-position four-way reversing valve (31), the T port of the three-position four-way reversing valve (31) is communicated with the B port of the three-position four-way reversing valve (31), at the moment, pressure oil enters a rodless cavity of the propelling hydraulic cylinder (36) through the balance valve (32), liquid return is connected to the B port of the three-position four-way reversing valve (31) through a rod cavity of the propelling hydraulic cylinder (36), the T port of the three-position four-way reversing valve (31) is connected to the liquid return pipeline (C6), and an outlet of the balance valve (32) is connected to the second safety valve (38) to protect the propelling hydraulic cylinder (36) from overload; The three-position four-way reversing valve (31) in the retracting hydraulic cylinder group is switched to the left position, the P port of the three-position four-way reversing valve (31) is communicated with the B port of the three-position four-way reversing valve (31), the T port of the three-position four-way reversing valve (31) is communicated with the A port of the three-position four-way reversing valve (31), at the moment, pressure oil enters a rod cavity of the propelling hydraulic cylinder (36), the retracting liquid is connected to the balance valve (32) through a rodless cavity of the propelling hydraulic cylinder (36), so that the propelling hydraulic cylinder (36) quickly retreats and the motion stability is ensured, before the three-position four-way reversing valve (31) is switched, the unloading valve (37) is required to be switched to the left position, the rodless cavity pressure of the propelling hydraulic cylinder (36) is reduced, and the vibration of the propelling system caused by the too high oil pressure is avoided; In the adjusting process, the two-position three-way reversing valve (35) always keeps the left position, at the moment, the control oil port C of the cartridge valve (33) is communicated with the A port of the two-position three-way reversing valve (35) through the P port of the two-position three-way reversing valve (35) and is in a high-pressure state, namely the valve port is always kept to be closed, the two-position three-way reversing valve (35) is switched to the right position only when the balance valve (32) in the retracting hydraulic cylinder group fails and cannot normally return liquid, at the moment, the control oil port C of the cartridge valve (33) is communicated with the B port of the two-position three-way reversing valve (35) through the P port of the two-position three-way reversing valve (35) and is connected to a leakage oil channel, the valve port is opened, and the return liquid flows into the B port of the cartridge valve (33) and flows out of the A port of the cartridge valve (33).
5. The synchronous push-splice shield propulsion hydraulic system according to claim 1, wherein each partition valve group is formed by connecting two-position three-way reversing valves in series; the two-position three-way reversing valves are completely the same and are provided with a P port, a T port and an A port, and the two-position three-way reversing valves are specifically divided into an upper position three-way reversing valve and a lower position three-way reversing valve, wherein the T port of the upper position three-way reversing valve of each partition valve group is connected with the A port of the lower position three-way reversing valve; Starting from the first partition valve group, the T port of the lower two-position three-way reversing valve of the first partition valve group is connected with the T port of the lower two-position three-way reversing valve of the second partition valve group, and the T port of the lower two-position three-way reversing valve of the third partition valve group is connected with the T port of the lower two-position three-way reversing valve of the fourth partition valve group until the T port of the lower two-position three-way reversing valve of the M-2 partition valve group is connected with the T port of the lower two-position three-way reversing valve of the M-1 partition valve group; starting from the second partition valve group, the P port of the lower two-position three-way reversing valve of the second partition valve group is connected with the P port of the lower two-position three-way reversing valve of the third partition valve group, and the P port of the lower two-position three-way reversing valve of the fourth partition valve group is connected with the P port of the lower two-position three-way reversing valve of the fifth partition valve group until the P port of the lower two-position three-way reversing valve of the M-1 partition valve group is connected with the P port of the lower two-position three-way reversing valve of the M partition valve group; the P port of the lower two-position three-way reversing valve of the first partition valve group is connected with the T port of the lower two-position three-way reversing valve of the M partition valve group.
6. The synchronous pushing and splicing shield propulsion hydraulic system according to claim 5, wherein the port B of the first control valve bank is connected with the port P of the upper two-position three-way reversing valve of each partition valve bank, the port B of the second control valve bank is correspondingly connected with the lower two-position three-way reversing valves of the first partition valve bank, the second partition valve bank and the third partition valve bank, the port B of the third control valve bank is correspondingly connected with the lower two-position three-way reversing valves of the third partition valve bank, the fourth partition valve bank and the fifth partition valve bank, and the port B of the N control valve bank is correspondingly connected with the lower two-position three-way reversing valves of the M-2 partition valve bank, the M-1 partition valve bank and the M partition valve bank.

Description

Dynamic zoning synchronous pushing and splicing shield pushing hydraulic system Technical Field The invention relates to the field of synchronous pushing and splicing shield construction, in particular to a synchronous pushing and splicing shield pushing hydraulic system capable of dynamically partitioning. Background At present, tunnel engineering gradually develops to the directions of large burial depth, large section and long distance, and is intensively expressed as an inter-city long tunnel in the urban area. The conventional shield construction method is to switch to a stop state to complete the assembly of the whole ring segment after the shield digs out a distance with the width of one ring segment. Generally speaking, the tunneling and splicing processes are time consuming. Therefore, under the alternate tunneling and splicing procedures, the conventional shield method can generate an overlong project construction period when applied to long (ultra-long) distance tunnel engineering. The synchronous pushing and splicing shield is used for carrying out parallel connection design on tunneling and splicing procedures, and is key tunneling equipment for improving tunnel construction efficiency. The concrete control mode is that in the synchronous pushing shield tunneling process, a pushing system needs to withdraw a pushing hydraulic cylinder in a corresponding area according to segment assembly points, and segment assembly work is completed by a segment assembly machine. At the moment, the rest hydraulic cylinders of the propulsion system are not withdrawn to provide tunneling power for the shield, so that synchronous pushing and splicing are realized. In the synchronous pushing and splicing shield construction process, a part of hydraulic cylinders cannot provide pushing force necessarily. In order to ensure that the shield can accurately tunnel along a design axis, two technical schemes of full hydraulic cylinder control and free partition control are mainly adopted at present. The whole hydraulic cylinder control can naturally improve the overall regulation and control precision of the system, but the throttling loss is large and the control cost is high. While free zone control typically requires configuration of multiple pressure sources to provide different pressures for each zone, it still falls within the fixed zone category and is not flexible enough. In addition, the assembly point positions are required to be determined according to the axis deviation in the shield tunneling process. With the change of the assembly points, there may be hydraulic cylinders distributed on a certain segment in a ring belonging to different partitions. And the difference of the subarea pressure can introduce overturning moment on the duct piece, so that the stress uniformity of the duct piece is greatly reduced. Therefore, in order to balance the regulation and control precision and the control cost of the propulsion hydraulic system and meet the requirements of local hydraulic cylinder withdrawal, segment stress uniformity and the like, a synchronous pushing and splicing shield propulsion hydraulic system capable of being dynamically partitioned is needed, and guarantees are provided for efficient and safe construction of long tunnels. Disclosure of Invention In order to solve the problems, the invention provides a dynamic zoning synchronous pushing and splicing shield pushing hydraulic system, in particular A dynamic zoned synchronous pushing shield pushing hydraulic system comprises a pump station, a dynamic zoned valve group and a hydraulic cylinder module; the hydraulic cylinder module comprises M hydraulic cylinder groups, a ring pipe piece and a plurality of hydraulic cylinder groups, wherein the M hydraulic cylinder groups act on an external ring pipe piece and provide propelling force; The dynamic partition valve bank is used for adjusting the partition area of the hydraulic cylinder module, comprises N control valve banks and M partition valve banks, wherein the number of the control valve banks is the same as that of the partitions of a ring segment, the first control valve bank always controls the pressure of the pushing hydraulic cylinder corresponding to the jacking block, and the other control valve banks control the pressure of the pushing hydraulic cylinder corresponding to the other partitions; the pump station is used for providing pressure oil for the dynamic partition valve group. The pump station comprises an oil tank, an oil inlet filter, a first manual stop valve, a motor, a variable pump, a remote pressure regulating valve, a first safety valve, a second manual stop valve, a high-pressure filter and a spring type one-way valve, wherein the oil tank is connected to an inlet of the variable pump through the oil inlet filter and the manual stop valve, the variable pump is connected with the motor through a coupler, the remote pressure regulating valve is arranged on the variable pump, the