CN211343533U - Automatic intelligent control hydraulic system for axial supporting force of foundation pit support - Google Patents
Automatic intelligent control hydraulic system for axial supporting force of foundation pit support Download PDFInfo
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- CN211343533U CN211343533U CN201922154847.6U CN201922154847U CN211343533U CN 211343533 U CN211343533 U CN 211343533U CN 201922154847 U CN201922154847 U CN 201922154847U CN 211343533 U CN211343533 U CN 211343533U
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Abstract
The utility model discloses an automatic intelligent control hydraulic system that is used for excavation supporting axial bracing power belongs to hydraulic machinery technical field. The utility model discloses a variable frequency speed governing directly drives formula machine pump package, variable frequency speed governing directly drive formula machine pump package and constitute by variable frequency speed regulator, inverter motor and superhigh pressure radial plunger pump, the input of superhigh pressure radial plunger pump is connected with the oil tank, the output of superhigh pressure radial plunger pump be connected with the pulse width control valves through high pressure oil pipe, the balanced valves that all carry is installed to the output of pulse width control valves, the balanced output that all carries the valves has hydraulic pressure support jack through oil line pipe connection. The utility model discloses can carry out the infinitely variable control of automatic pressurization, constant voltage, release to the axial holding power that excavation supporting goes on, wireless data transmission device gives operating user with the axial holding power of PLC controller real time monitoring system collection through wireless network transmission in real time, satisfies the user and controls in real time to the axial holding power.
Description
Technical Field
The utility model relates to a hydraulic machinery equipment technical field, more specifically say, relate to a be used for automatic intelligent control hydraulic system of excavation supporting axial bracing power.
Background
A hydraulic support control system for foundation pit support is a novel technical application appearing in recent years, the conventional common support generally adopts an inner support mode, and the common support is a steel pipe support or an assembly type profile steel support. The joint is generally a movable joint, axial force is pre-applied by a jack, and a steel wedge is inserted. With the placement of the foundation pit, the supporting axial force is obviously attenuated, and further obvious supporting deformation is caused. This deformation increases with the time of placement, and in some cases the support deformation can be twice as large as the deformation after excavation. Although the measure of adding the axial force is adopted in a construction site, the problem cannot be solved essentially because the secondary adding of the axial force construction after excavation is difficult. In the using process, a plurality of defects and potential safety hazards exist: (1) and supporting the stability of the hydraulic system: the hydraulic pump station system of the existing support system utilizes the on-off of an electromagnetic valve and a proportional overflow valve to adjust the thrust of a jack to control the axial force of a rigid support, and the control of the axial force of a steel support has great fluctuation in such an adjusting mode, so that the control precision is not accurate; (2) and a pressure maintaining device: the conventional jack pressure maintaining device for supporting a hydraulic system adopts a conventional hydraulic control one-way valve, and pressure relief is too fast at the moment of unloading (or reducing) a steel support due to the structural characteristics of the valve, so that instant internal force mutation can be generated on a supported foundation pit supporting system; (3) and safety guarantee measures: the safety guarantee measures of the existing supporting hydraulic system mainly adopt a mechanical screw and are manually locked or unlocked. If the steel support axial force changes, after the system automatically re-adds the axial force, the mechanical screw still needs to be manually locked for effective safety guarantee, so that the operability and the real-time performance are extremely low on a construction site. In addition, when the internal force of the body protector is increased and accurate pressure relief is needed, the mechanical screw must increase the internal force firstly and then release the pressure after the mechanical nut is loosened manually.
SUMMERY OF THE UTILITY MODEL
1. Technical problem to be solved by the utility model
The defect and not enough to prior art exist, the utility model provides a be used for the automatic intelligent control hydraulic system of excavation supporting axial holding power, the utility model discloses can carry out the infinitely variable control of automatic pressurization, constant voltage, release to the axial holding power that excavation supporting goes on, wireless data transmission device gives operating user with the axial holding power of PLC controller real-time monitoring system collection through wireless network transmission in real time, satisfies the user and controls in real time to the axial holding power.
2. Technical scheme
In order to achieve the above purpose, the utility model provides a technical scheme does:
the utility model discloses an automatic intelligent control hydraulic system for supporting axial supporting force of foundation pit, including variable frequency speed governing direct drive formula machine pump package and steel shotcrete, variable frequency speed governing direct drive formula machine pump package constitute by variable frequency speed regulator, inverter motor and superhigh pressure radial plunger pump, inverter motor's input be provided with the variable frequency speed regulator, inverter motor's output shaft and superhigh pressure radial plunger pump are connected, superhigh pressure radial plunger pump's input is connected with the oil tank, superhigh pressure radial plunger pump's output be connected with the pulse width control valves through high-pressure oil pipe, the output of pulse width control valves is installed balanced and is carried the valves, the output of balanced and carried the valves is connected with the hydraulic support jack through the oil circuit pipeline;
one side of hydraulic support jack install the tip at the steel shotcrete, the deep basal pit protection body is connected to hydraulic support jack's opposite side, is provided with mechanical self-locking nut on hydraulic support jack's the piston rod, balanced all carry the oil circuit pipeline between valves and the hydraulic support jack in ann and be equipped with pressure sensor, hydraulic support jack's surface is connected with extreme position sensor, the oil tank outside install electrical control box, electrical control box internally mounted has PLC controller real-time monitoring system and wireless data transmission device respectively, PLC controller real-time monitoring system's output is connected with wireless data transmission device's input electricity.
Furthermore, the variable-frequency speed-regulating direct-drive type motor pump set, the pulse width control valve set, the balance load-balancing valve set and the pressure sensor are all arranged on the oil tank.
Furthermore, the variable frequency motor is driven by the variable frequency speed regulator and drives the ultrahigh pressure radial plunger pump to work, the output oil quantity and pressure are subjected to stepless regulation, continuous flow change and pressure change are realized, the ultrahigh pressure radial plunger pump is a valve flow distribution plunger pump, and the output efficiency is greater than 0.98.
Furthermore, the pulse width control valve group consists of n high-speed electromagnetic valves, n groups of oil ways are selected according to system setting, automatic cycle scanning is carried out, automatic on-off compensation is carried out on supporting force, a PLC controller monitors n supporting force values P1 preset by the system in real time and compares the supporting force values P2 detected by pressure sensors arranged on the balanced load-sharing valve group, a calculated error value delta P is calculated, when the delta P is larger than or equal to a preset error absolute value P3, the pulse width control valve group is automatically opened, when the delta P is smaller than a preset error absolute value P3, the pulse width control valve group is automatically closed, and the supporting force value P2 is automatically maintained.
Furthermore, the balanced load-sharing valve group realizes the automatic pressure maintaining function of real-time supporting force, hydraulic oil output by the variable-frequency speed-regulating direct-drive type engine pump group 7 enters the hydraulic supporting jack through an oil pipe and reaches a required preset n supporting force value P1, the balanced load-sharing valve group can lock the hydraulic oil in the hydraulic supporting jack, the pressure is kept in the hydraulic supporting jack, and constant axial supporting force is kept for a long time.
Furthermore, the balanced load-sharing valve group realizes the automatic pressure relief and adjustment function of the supporting force, when the supporting force exceeds a preset n supporting force value P1 due to the influence of external force or environment on the soil pressure, the variable-frequency speed-regulating direct-drive type engine pump group supplies oil to a pilot control port of the balanced load-sharing valve group through the pulse width control valve group, and the balanced load-sharing valve group proportionally relieves the real-time supporting force to the range of the preset n supporting force value P1, so that the automatic pressure relief and adjustment function of the supporting force is realized.
Furthermore, the pressure sensor monitors the real-time axial supporting force of the hydraulic supporting jack in real time, the pressure sensor transmits the detected real-time axial supporting force to the PLC real-time monitoring system, the pressure sensor, the PLC real-time monitoring system, the variable-frequency speed-regulating direct-drive type engine pump set and the pulse width control valve set form pressure closed-loop control, the PLC real-time monitoring system is externally connected with a digital filter, and the pressure sensor eliminates pressure pulsation and interference through the digital filter.
Furthermore, a sensor digital collector, an operational amplifier and an integral arithmetic unit are arranged in the PLC real-time monitoring system, data of the supporting pressure sensor are collected to an operation center in real time, are operated with preset supporting force and are output to the variable-frequency speed regulator after being processed by the amplifier and the integral arithmetic unit, so that the variable-frequency speed regulating direct-drive type engine pump set is controlled to supply oil to the hydraulic supporting jack, and the operational amplifier also generates a PWM pulse width control circuit so as to control the pulse width control valve set to work.
Further, the wireless data transmission device transmits the axial supporting force acquired by the PLC real-time monitoring system to an operation user through a wireless WIFI-4G network in real time.
3. Advantageous effects
Adopt the technical scheme provided by the utility model, compare with prior art, have following beneficial effect:
(1) the utility model discloses a pressure sensor and the predetermined n holding power of PLC controller real time monitoring system, carry out closed-loop control and adjust inverter motor rotational speed stepless speed regulation, inverter motor drive superhigh pressure radial plunger pump, can carry out stepless regulation to the oil mass and the pressure of output, it also can reach high-efficient accurate oil mass to satisfy inverter motor drive superhigh pressure radial plunger pump under the low revolution, variable frequency speed regulation directly drives formula machine pump package and carries out low revolution micro-regulation at the during operation according to the pressure variation of holding pressure, do not need full flow work of overall process, just so can not produce unnecessary energy loss, hydraulic oil in the system just can not produce too high temperature.
(2) The utility model discloses can carry out the infinitely variable control of automatic pressurization, constant voltage, release to the axial holding power that excavation supporting goes on, wireless data transmission device gives operating user with the axial holding power of PLC controller real time monitoring system collection through wireless network transmission in real time, satisfies the user and controls in real time to the axial holding power.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a partial enlarged view of the present invention;
FIG. 3 is a schematic diagram of a single oil path according to the present invention;
fig. 4 is a schematic circuit diagram of the monitoring system of fig. 3 according to the present invention;
fig. 5 is a schematic diagram of the digital filter circuit of fig. 3 according to the present invention.
In the figure: 1. a variable frequency governor; 2. a variable frequency motor; 3. an ultra-high pressure radial plunger pump; 4. an extreme position sensor; 5. an oil tank; 6. a PLC controller real-time monitoring system; 7. a variable frequency speed-regulating direct-drive type engine pump set; 8. a mechanical self-locking nut; 9. a pulse width control valve group; 10. a balanced load balancing valve bank; 11. a pressure sensor; 12. a hydraulic support jack; 13. supporting steel; 14. a digital filter; 15. a wireless data transmission device.
Detailed Description
The invention is further described with reference to the following figures and examples:
example 1
As can be seen from fig. 1-5, the automatic intelligent control hydraulic system for supporting axial supporting force of foundation pit of this embodiment includes a variable frequency speed control direct-drive type mechanical pump unit 7 and a steel support 13, the variable frequency speed control direct-drive type mechanical pump unit 7 is an energy-saving oil supply mechanical pump unit, the variable frequency speed control direct-drive type mechanical pump unit 7 is composed of a variable frequency speed controller 1, a variable frequency motor 2 and an ultrahigh pressure radial plunger pump 3, the input end of the variable frequency motor 2 is provided with the variable frequency speed controller 1, the output shaft of the variable frequency motor 2 is connected with the ultrahigh pressure radial plunger pump 3, the input end of the ultrahigh pressure radial plunger pump 3 is connected with an oil tank 5, the output end of the ultrahigh pressure radial plunger pump 3 is connected with a pulse width control valve group 9 through a high pressure oil pipe, the output end of the pulse width control valve group 9 is, the frequency-conversion speed-regulation direct-drive type engine pump unit 7, the pulse width control valve group 9, the balance load-balancing valve group 10 and the pressure sensor 11 are all arranged on the oil tank 5.
One side of a hydraulic supporting jack 12 is installed at the end part of a steel support 13, the other side of the hydraulic supporting jack 12 is connected with a deep foundation pit protection body, a mechanical self-locking nut 8 is arranged on a piston rod of the hydraulic supporting jack 12, the mechanical self-locking nut 8 is matched with the hydraulic system for use, once unexpected accidents such as sudden long-time power failure and the like occur, the mechanical self-locking nut 8 is immediately locked manually, the safety guarantee of an axial supporting system can be ensured, a pressure sensor 11 is installed in an oil circuit pipeline between a balanced load-sharing valve group 10 and the hydraulic supporting jack 12, the surface of the hydraulic supporting jack 12 is connected with a limit position sensor 4, the limit position sensor 4 detects the supporting working stroke of the hydraulic supporting jack 12 in real time, the effective work of the hydraulic supporting jack 12 is ensured, when the stroke of the hydraulic supporting jack 12 exceeds an effective stroke range, and transmitting a signal to the PLC real-time monitoring system 6, and sending an alarm signal to an operation user by the PLC real-time monitoring system 6 to play an early warning report of safe work.
An electrical control box is installed on the outer side of the oil tank 5, a PLC (programmable logic controller) real-time monitoring system 6 and a wireless data transmission device 15 are installed inside the electrical control box respectively, and the output end of the PLC real-time monitoring system 6 is electrically connected with the input end of the wireless data transmission device 15.
The variable frequency motor 2 is driven by the variable frequency speed regulator 1 and drives the ultrahigh pressure radial plunger pump 3 to work, the output oil quantity and pressure are subjected to stepless regulation, continuous flow change and pressure change are realized, the ultrahigh pressure radial plunger pump 3 is a valve flow distribution plunger pump, and the output efficiency is greater than 0.98.
Variable frequency speed governing directly drives formula machine pump package 7 and passes through the n holding power that pressure sensor 11 and PLC controller real time monitoring system 6 predetermine, carry out closed loop control and adjust 2 stepless speed regulation of inverter motor's rotational speed, inverter motor 2 drives the radial plunger pump 3 of superhigh pressure, can carry out stepless regulation to the oil mass and the pressure of output, it also can reach high-efficient accurate oil mass to satisfy inverter motor 2 drive the radial plunger pump 3 of superhigh pressure under the low revolution, variable frequency speed governing directly drives formula machine pump package 7 and carries out low revolution micro-regulation according to the pressure variation of holding pressure at the during operation, do not need full flow work of overall process, just so can not produce unnecessary energy loss, hydraulic oil in the system just can not produce too high temperature.
The pulse width control valve group 9 is composed of n high-speed electromagnetic valves, n groups of oil ways are selected according to system setting, automatic cycle scanning is carried out, automatic on-off compensation is carried out on supporting force, n supporting force values P1 preset by the PLC real-time monitoring system 6 are compared with supporting force values P2 detected by pressure sensors 11 installed on the balanced load-sharing valve group 10, a calculated error value delta P is calculated, when the delta P is larger than or equal to a preset error absolute value P3, the pulse width control valve group 9 is automatically opened, when the delta P is smaller than a preset error absolute value P3, the pulse width control valve group 9 is automatically closed, and the supporting force values P2 are automatically maintained.
The balanced all-load valve group 10 realizes the automatic pressure maintaining function of real-time supporting force, hydraulic oil output by the variable-frequency speed-regulating direct-drive type engine pump group 7 enters the hydraulic support jack 12 through an oil pipe and reaches a required preset n supporting force value P1, the balanced all-load valve group 10 can lock the hydraulic oil in the hydraulic support jack 12, the pressure is kept in the hydraulic support jack 12, and constant axial supporting force is kept for a long time.
The balanced load-sharing valve group 10 realizes the automatic pressure relief and adjustment function of the supporting force, when the supporting force exceeds a preset n supporting force value P1 due to the influence of external force or environment on the soil pressure, the variable-frequency speed-regulating direct-drive type engine pump unit 7 supplies oil to a pilot control port of the balanced load-sharing valve group 10 through the pulse width control valve group 9, and the balanced load-sharing valve group 10 proportionally relieves the real-time supporting force to the preset n supporting force value P1 range, so that the automatic pressure relief and adjustment function of the supporting force is realized.
The real-time axial supporting force of the hydraulic supporting jack 12 is monitored by the pressure sensor 11 in real time, the real-time axial supporting force detected by the pressure sensor 11 is transmitted to the PLC real-time monitoring system 6, the pressure sensor 11, the PLC real-time monitoring system 6, the variable-frequency speed-regulating direct-drive type engine pump unit 7 and the pulse width control valve group 9 form pressure closed-loop control, the PLC real-time monitoring system 6 is externally connected with a digital filter 14, the pressure sensor 11 eliminates pressure pulsation and interference through the digital filter 14, and the stability and accuracy of pressure monitoring are improved.
The PLC controller real-time monitoring system 6 is internally provided with a sensor digital collector, an operational amplifier and an integral arithmetic unit, data of a supporting pressure sensor 11 is collected to an operation center in real time, is operated with a preset supporting force, is processed by the amplifier and the integral arithmetic unit and then is output to the variable-frequency speed regulator 1, so that the variable-frequency speed-regulating direct-drive type engine pump unit 7 is controlled to supply oil to the hydraulic supporting jack 12, and the operational amplifier also generates a PWM pulse width control circuit at the same time, so that the pulse width control valve group 9 is controlled to work.
The wireless data transmission device 15 transmits the axial supporting force acquired by the PLC real-time monitoring system 6 to an operating user through a wireless WIFI-4G network in real time, real-time control of the user on the axial supporting force is met, meanwhile, a supporting force out-of-tolerance alarm signal can be set in the wireless data transmission device 15 and sent to a preset mobile phone number of the user.
The utility model discloses a pressure sensor 11 and the 6 predetermined n holding power of PLC controller real time monitoring system, carry out closed-loop control and adjust 2 rotational speed stepless speed regulation of inverter motor, inverter motor 2 drives the radial plunger pump 3 of superhigh pressure, can carry out infinitely variable control to the oil mass and the pressure of output, it also can reach high-efficient accurate oil mass to satisfy inverter motor 2 drive the radial plunger pump 3 of superhigh pressure under the low revolution, frequency control directly drives formula pump package 7 and carries out low revolution micro-regulation at the during operation according to the pressure variation of holding pressure, do not need full flow work of overall process, just so can not produce unnecessary energy loss, hydraulic oil in the system just can not produce too high temperature.
The utility model discloses can carry out the infinitely variable control of automatic pressurization, constant voltage, release to the axial holding power that excavation supporting goes on, wireless data transmission device 15 gives operating user with the axial holding power of 6 gathers of PLC controller real-time monitoring system through wireless WIFI-4G network transmission in real time, satisfies the user and controls in real time to the axial holding power.
The present invention and its embodiments have been described above schematically, and the description is not limited thereto, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching of the present invention, without departing from the inventive spirit of the present invention, the person skilled in the art should also design the similar structural modes and embodiments without creativity to the technical solution, and all shall fall within the protection scope of the present invention.
Claims (9)
1. The utility model provides an automatic intelligent control hydraulic system for excavation supporting axial support power, includes frequency conversion speed governing direct-drive formula machine pump package (7) and steel shotcrete (13), its characterized in that: the variable-frequency speed-regulating direct-drive type motor pump set (7) is composed of a variable-frequency speed regulator (1), a variable-frequency motor (2) and an ultrahigh-pressure radial plunger pump (3), wherein the variable-frequency speed regulator (1) is arranged at the input end of the variable-frequency motor (2), the output shaft of the variable-frequency motor (2) is connected with the ultrahigh-pressure radial plunger pump (3), the input end of the ultrahigh-pressure radial plunger pump (3) is connected with an oil tank (5), the output end of the ultrahigh-pressure radial plunger pump (3) is connected with a pulse width control valve set (9) through a high-pressure oil pipe, the output end of the pulse width control valve set (9) is provided with a balance load-equalizing valve set (10), and the output end of the;
one side of hydraulic support jack (12) install the tip at steel shotcrete (13), the deep basal pit protection body is connected to the opposite side of hydraulic support jack (12), is provided with mechanical self-locking nut (8) on the piston rod of hydraulic support jack (12), the balance all carry and install pressure sensor (11) in the oil circuit pipeline between valves (10) and hydraulic support jack (12), the surface connection of hydraulic support jack (12) has extreme position sensor (4), oil tank (5) outside install the electrical apparatus control box, inside PLC controller real-time monitoring system (6) and the wireless data transmission device (15) of installing respectively of electrical apparatus control box, the output of PLC controller real-time monitoring system (6) is connected with the input electricity of wireless data transmission device (15).
2. The automatic intelligent control hydraulic system for the axial supporting force of the foundation pit support according to claim 1, characterized in that: the variable-frequency speed-regulating direct-drive type motor pump unit (7), the pulse width control valve group (9), the balance load-balancing valve group (10) and the pressure sensor (11) are all arranged on the oil tank (5).
3. The automatic intelligent control hydraulic system for the axial supporting force of the foundation pit support according to claim 1, characterized in that: the variable frequency motor (2) is driven by the variable frequency speed regulator (1) and drives the ultrahigh pressure radial plunger pump (3) to work, the output oil quantity and pressure are subjected to stepless regulation, continuous flow change and pressure change are realized, the ultrahigh pressure radial plunger pump (3) is a valve flow distribution plunger pump, and the output efficiency is greater than 0.98.
4. The automatic intelligent control hydraulic system for the axial supporting force of the foundation pit support according to claim 1, characterized in that: the pulse width control valve group (9) is composed of n high-speed electromagnetic valves, n groups of oil ways are selected according to system setting, automatic circular scanning is carried out, automatic on-off compensation is carried out on supporting force, n supporting force values P1 preset by a PLC real-time monitoring system (6) are compared with supporting force values P2 detected by pressure sensors (11) installed on a balanced load-sharing valve group (10), a calculated error value delta P is calculated, when the delta P is larger than or equal to a preset error absolute value P3, the pulse width control valve group (9) is automatically opened, when the delta P is smaller than a preset error absolute value P3, the pulse width control valve group (9) is automatically closed, and the supporting force value P2 is automatically maintained.
5. The automatic intelligent control hydraulic system for the axial supporting force of the foundation pit support according to claim 4, wherein: the balanced group valve (10) of all carrying realize the automatic pressurize function of real-time holding power, the hydraulic oil of variable frequency speed governing direct-driven formula machine pump package (7) output passes through oil pipe, gets into hydraulic pressure support jack (12) inside when reaching required predetermined n holding power value P1, balanced group valve (10) of all carrying can lock hydraulic oil in hydraulic pressure support jack (12), pressure keeps in hydraulic pressure support jack (12), keeps invariable axial holding power for a long time.
6. The automatic intelligent control hydraulic system for the axial supporting force of the foundation pit support according to claim 5, wherein: the balanced load-sharing valve group (10) realizes the automatic pressure relief and adjustment function of the supporting force, when the supporting force exceeds a preset n supporting force value P1 due to the influence of external force or environment on the soil pressure, the variable-frequency speed-regulating direct-drive type engine pump group (7) supplies oil to a pilot control port of the balanced load-sharing valve group (10) through the pulse width control valve group (9), and the balanced load-sharing valve group (10) unloads the real-time supporting force to the range of the preset n supporting force value P1 in proportion, so that the automatic pressure relief and adjustment function of the supporting force is realized.
7. The automatic intelligent control hydraulic system for the axial supporting force of the foundation pit support according to claim 1, characterized in that: pressure sensor (11) real-time supervision hydraulic support jack (12) real-time axial holding power, pressure sensor (11) transmit the real-time axial holding power that detects to PLC controller real-time monitoring system (6), pressure sensor (11), PLC controller real-time monitoring system (6) and frequency control direct drive formula machine pump package (7) and pulse width control valves (9) constitute pressure closed-loop control, PLC controller real-time monitoring system (6) external digital filter (14), pressure sensor (11) are through digital filter (14) with pressure pulsation and interference elimination.
8. The automatic intelligent control hydraulic system for the axial supporting force of the foundation pit support according to claim 1, characterized in that: the PLC real-time monitoring system (6) is internally provided with a sensor digital collector, an operational amplifier and an integral arithmetic unit, data of a supporting pressure sensor (11) is collected to an operation center in real time, is operated with a preset supporting force and is output to the variable-frequency speed regulator (1) after being processed by the amplifier and the integral arithmetic unit, so that the variable-frequency speed-regulating direct-drive type engine pump set (7) is controlled to supply oil to the hydraulic supporting jack (12), and the operational amplifier also generates a PWM pulse width control circuit at the same time, so that the pulse width control valve set (9) is controlled to work.
9. The automatic intelligent control hydraulic system for the axial supporting force of the foundation pit support according to claim 1, characterized in that: the wireless data transmission device (15) transmits the axial supporting force acquired by the PLC real-time monitoring system (6) to an operation user through a wireless WIFI-4G network in real time.
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| CN110792647A (en) * | 2019-12-05 | 2020-02-14 | 马鞍山瑞马钢构材料有限公司 | Automatic intelligent control hydraulic system for axial supporting force of foundation pit support |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110792647A (en) * | 2019-12-05 | 2020-02-14 | 马鞍山瑞马钢构材料有限公司 | Automatic intelligent control hydraulic system for axial supporting force of foundation pit support |
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