CN106840472A - A kind of high-precision three-dimensional soil pressure testing device and its range adjustment system - Google Patents

A kind of high-precision three-dimensional soil pressure testing device and its range adjustment system Download PDF

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Publication number
CN106840472A
CN106840472A CN201710020619.2A CN201710020619A CN106840472A CN 106840472 A CN106840472 A CN 106840472A CN 201710020619 A CN201710020619 A CN 201710020619A CN 106840472 A CN106840472 A CN 106840472A
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CN
China
Prior art keywords
permanent magnet
dynamometer spring
spring
dynamometer
vertical
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CN201710020619.2A
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Chinese (zh)
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CN106840472B (en
Inventor
王浩
郑文智
茅建校
荀智翔
陶天友
王飞球
朱克宏
刘海浪
铁栋
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东南大学
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Priority to CN201710020619.2A priority Critical patent/CN106840472B/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00Measuring force or stress, in general
    • G01L1/04Measuring force or stress, in general by measuring elastic deformation of gauges, e.g. of springs
    • G01L1/042Measuring force or stress, in general by measuring elastic deformation of gauges, e.g. of springs of helical springs
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00Measuring arrangements characterised by the use of optical means
    • G01B11/16Measuring arrangements characterised by the use of optical means for measuring the deformation in a solid, e.g. optical strain gauge

Abstract

The invention discloses a kind of high-precision three-dimensional soil pressure testing device and its range adjustment system, including vertical main dynamometer spring, some horizontal dynamometer springs, base plate, inner cylinder, central deck, side top board and some outer panels.The present apparatus is inside and outside cylinder system, and inner cylinder is used to measure vertical earth pressure and land movement, and outer barrel is used to measure the level of surrounding soil to soil pressure and land movement.Its range adjustment system is powered by dynamometer spring, dynamometer spring inner conductor is set to produce magnetic field, magnetic field force is controlled by the size of control electric current, adjust the rigidity of dynamometric system, the range of test device is controlled, the soil body, extra-high inside soil body soil pressure real-time monitoring are excavated to realize the ultra-deep foundation pit soil body, close on bridge pier.

Description

A kind of high-precision three-dimensional soil pressure testing device and its range adjustment system

Technical field

The present invention relates to a kind of high-precision three-dimensional soil pressure testing device and its range adjustment system, it is adaptable to civil engineering Field.

Background technology

With being on the increase for field of civil engineering Large Infrastructure Projects, superelevation super-span building, Longspan Bridge, tunnel The scale of road, high-speed railway and subway constantly expands, and to ensure safe and reliable, the high cut slope excavation of work progress, closes on building Deep pit digging, closes in the work progress such as high ferro bridge pier, and the displacement field mutation parameter for closing on the soil body needs real-time monitoring, to keep away Exempt to be given people because of the generation of engineering accident the massive losses of life and property.

High slope unstability, foundation ditch the engineering problem such as collapse and happen occasionally, it turns out that, the main cause of problem is in construction During, support system Lack of support, the poor in timeliness of monitoring does not grasp the three-dimensional stress constraint of the soil body to be measured in real time, Cause the generation of accident.Construction site surrounding soil pressure real-time monitoring is used as the effective means for ensureing construction safety, it appears extremely Close important.At present, domestic and foreign scholars have done many research on soil pressure testing device, propose the earth pressure test of various new Device, existing soil pressure testing device to improve based on measuring accuracy, by traditional unidirectional soil pressure testing device by whole The mode such as close and realize multidimensional earth pressure test, and, this kind of soil pressure testing device has uncontrollability, its close beta system The range of system has unadjustable property, it is difficult to adapt to the soil pressure measurement under various soil body effects.In Practical Project work progress, The three-dimensional stress constraint of the soil body is most important when grasping soil displacement field mutation in real time, and real-time monitoring land movement is solve problem Basic place.It is adjacent for the three-dimensional stress constraint real-time monitoring of a certain depth soil body, such as high slope inside soil body real-time status The displacement that nearly deep foundation pit of construction excavates the soil body is dynamic in real time, and when closing on the piling of high ferro bridge pier, bridge pier surrounding soil is vertically impacted The three-D displacement real-time monitoring of different depth soil body during load action, it is therefore intended that under conditions of ensuring normal construction, it is ensured that week Enclose the normal safe operation of facility.

At present, traditional soil pressure testing device and method of testing still Shortcomings:

(1) soil body soil pressure, the unidirectional of land movement test

(2) uncontrollability of soil pressure testing device range

Soil pressure testing device controllability in itself is poor, it is difficult to be applied to the larger soil of the various soil bodys, particularly buried depth Body pressure, the measurement of displacement.

The content of the invention

Goal of the invention:For above-mentioned prior art, propose that a kind of high-precision three-dimensional soil pressure testing device and its range are adjusted Whole system, the high-precision three-dimensional soil pressure testing device can in real time grasp the three-dimensional stress constraint of the soil body, the range adjustment System can be according to the range of actual measurement soil body parameter adjustment controls.

Technical scheme:A kind of high-precision three-dimensional soil pressure testing device, including vertical main dynamometer spring, some horizontal dynamometry Spring, base plate, inner cylinder, central deck, side top board and some outer panels;Wherein, the center of the base plate is fixed with bottom Plate permanent magnet, the central deck is circle, and top board permanent magnet is fixed with its medial surface;It is provided with logical in the middle of the side top board Hole, the diameter of the through hole is consistent with the internal diameter of the inner cylinder and the diameter of the central deck, and the central deck sets Put in the through hole in the middle of the side top board;

The vertical main dynamometer spring is vertically fixed on the base plate permanent magnet, and the inner cylinder is enclosed within the vertical main survey Outside power spring, and it is vertically fixed on the base plate, the top of the inner cylinder is affixed with the side top board;The central deck side Face is provided with the upright slide rail for matching with the medial surface of the inner cylinder;Some outer panels are vertically arranged with circle ring array interval Outside the inner cylinder, connected using flexible connection between adjacent outer plate, inner side permanent magnet be fixed with the inner cylinder lateral wall, Outside permanent magnet is fixed with every piece of outer panel madial wall, the level is set between every piece of outer panel and inner cylinder Dynamometer spring, the two ends of the horizontal dynamometer spring are separately fixed on the inner side permanent magnet and outside permanent magnet;Every piece institute State the horizontal slide rail for being provided between the both ends of outer panel and side top board and base plate and being matched.

Further, also including some vertical dynamometer springs, the vertical dynamometer spring in the inner cylinder, around The vertical main dynamometer spring is vertically arranged with circle ring array interval, and its bottom is fixed on the base plate permanent magnet;At every piece Multiple horizontal dynamometer springs are provided between the outer panel and inner cylinder, multiple horizontal dynamometer springs are located at same perpendicular In straight plane, and spaced set.

Further, the vertical main dynamometer spring, vertical dynamometer spring and top board permanent magnet and base plate permanent magnet Between set insulation, between the horizontal dynamometer spring and inner side permanent magnet and outside permanent magnet set insulation.

Further, it is respectively equipped with the vertical main dynamometer spring, vertical dynamometer spring and horizontal dynamometer spring Iron core, the iron core lateral surface is along the circumferential direction uniformly provided with some along the axially arranged slide rail of iron core, the vertical main survey Power spring, vertical dynamometer spring and horizontal dynamometer spring inner side are uniformly provided with some guiding elastic bearings along spiral circumference, The guiding elastic bearing can be adapted to the slide rail.

Further, it is equipped with outside the vertical main dynamometer spring, vertical dynamometer spring and horizontal dynamometer spring and is led Pipe.

Further, the base plate, inner cylinder, central deck, side top board and outer panel are epoxy glass fiber plate.

A kind of range adjustment system of high-precision three-dimensional soil pressure testing device, including power supply, some fibre strain formulas position Move meter, optical fiber modulation /demodulation instrument, data collecting instrument, data analysis system and control system;The power supply connects described respectively Vertical main dynamometer spring, vertical dynamometer spring, the two ends of horizontal dynamometer spring, the fibre strain formula displacement meter are vertically arranged On the base plate permanent magnet and each outside permanent magnet;The optical fiber modulation /demodulation instrument connects each fibre strain by optical fiber Formula displacement meter, the signal output of each fibre strain formula displacement meter is transferred to the data analysis system by the data collecting instrument System, the data analysis system is used to calculate soil movement rate and further calculates the displacement of the soil body in certain hour Variable quantity;The control system according to the displacement variable of the soil body in the certain hour, by controlling electric power outputting current Size come the magnetic pole that controls the main dynamometer spring and vertical dynamometer spring to be formed and top board permanent magnet and base plate permanent magnet it Between repulsive interaction, and control the magnetic pole that the horizontal dynamometer spring is formed with horizontal inner side permanent magnet and horizontal outer side permanent magnet Between repulsive interaction, realize test device range adjust.

Beneficial effect:A kind of high-precision three-dimensional soil pressure testing device of the invention is inside and outside cylinder system, and inner cylinder is used for Measurement vertical earth pressure and land movement, outer barrel are used to measure the level of surrounding soil to soil pressure and land movement.To overcome The unidirectional of the measurement of traditional soil pressure sensor, the various soil bodys are difficult to controllability, the present apparatus can realize the soil body Space displacement field mutation parameter real time monitoring, displacement, the variation track of soil pressure of the real-time accurate perception soil body to be measured,.

Its range adjustment system is powered by dynamometer spring, dynamometer spring inner conductor is produced magnetic field, by control The size of electric current controls magnetic field force, adjusts the rigidity of dynamometric system, controls the range of test device, to realize ultra-deep foundation pit soil Body, close on bridge pier excavate the soil body, extra-high inside soil body soil pressure real-time monitoring.The device and its range adjustment system are applicable In high slope soil excavation, adjacent building deep pit digging, surrounding soil displacement field mutation parameter when high ferro bridge pier is driven piles is closed on Real-time monitoring, and parameter can be surveyed according to the soil body and carry out Self Adaptive Control, be the later stage monitoring suitable range of selection, it is ensured that essence Degree.

Brief description of the drawings

Fig. 1 is a kind of top view of high-precision three-dimensional soil pressure testing device;

Fig. 2 is the cross sectional side view at A-A in Fig. 1;

Fig. 3 is the top view of base plate 12 in Fig. 2;

Fig. 4 is the top view of top board 10,11 in Fig. 2;

Fig. 5 a are the thin portion side view of vertical dynamometric system in Fig. 2;Fig. 5 b are the thin portion side view of Fig. 5 a;

Fig. 6 a are guiding elastic bearing side view;Fig. 6 b are guiding elastic bearing top view;

Fig. 7 a are the thin portion top view of horizontal dynamometric system in Fig. 2;Fig. 7 b are the cross-section front view at B-B in Fig. 7 a;

Fig. 8 is the schematic diagram of electromagnetic induction controling power;

Fig. 9 is control system flow chart.

Specific embodiment

The present invention is done below in conjunction with the accompanying drawings further is explained.

A kind of high-precision three-dimensional soil pressure testing device, including vertical main dynamometer spring 1, some vertical dynamometer springs 2, Some horizontal dynamometer springs 6, base plate 12, inner cylinder 5, central deck 11, side top board 10 and some outer panels 8.Wherein, base plate 12nd, inner cylinder 5, central deck 11, side top board 10 and outer panel 8 are epoxy glass fiber plate, it is ensured that while intensity, can Realize insulation connection.

As shown in figure 3, the center of base plate 12 is fixed with base plate permanent magnet 14.As shown in figure 4, central deck 11 is circle Shape, its medial surface is provided with top board permanent magnet 13.Be provided with through hole in the middle of side top board 10, the diameter of through hole and the internal diameter of inner cylinder 5 with And the diameter of central deck 11 is consistent.As shown in Figure 1 and Figure 2, vertical main dynamometer spring 1 is vertically fixed on base plate permanent magnet 14 Center, four vertical dynamometer springs 2 are vertically arranged around vertical main dynamometer spring 1 with circle ring array interval, and its bottom is fixed On base plate permanent magnet 14.The top of vertical main dynamometer spring 1 and vertical dynamometer spring 2 is fixed on top board permanent magnet 13. Vertical main dynamometer spring 1, vertical setting insulation between dynamometer spring 2 and top board permanent magnet 13 and base plate permanent magnet 14.It is perpendicular Dominated to pipe 3 to being socketed with outside main dynamometer spring 1, each vertical dynamometer spring 2 is outer respectively to be socketed with time guide pipe 4, dominate to Pipe 3 and time guide pipe 4 are vertically fixed on base plate 12, and its top is fixed in central deck 11.

Inner cylinder 5 is enclosed within outside vertical main dynamometer spring 1 and vertical dynamometer spring 2, and is vertically fixed on base plate 12.Inner cylinder 5 top is affixed with side top board 10, and central deck 11 is located in the through hole in the middle of side top board 10, as shown in Figure 2.Central deck 11 Side is provided with the upright slide rail for matching with the medial surface of inner cylinder 5.Some outer panels 8 are vertically arranged in interior with circle ring array interval Outside cylinder 5, connected using flexible connection 9 between adjacent outer plate 8, all outer panels 8, flexible connection 9, side top board 10, base plate 12 And inner cylinder 5 is collectively forming closed cavity, to realize that soil displacement field mutation parameter real time monitoring provides condition.Every piece of outer panel The horizontal slide rail for matching is provided between 8 both ends and side top board 10 and base plate 12.Upright guide rail and horizontal guide rail inner side set Lubricating oil is put, sidewall friction is reduced as far as possible, it is ensured that measuring accuracy.

As shown in fig. 7, being fixed with inner side permanent magnet 17 on the lateral wall of inner cylinder 5, it is fixed with every piece of madial wall of outer panel 8 outer Side permanent magnet 19, horizontal dynamometer spring 6 is set between every piece of outer panel 8 and inner cylinder 5.Also, in every piece of outer panel 8 and inner cylinder Multiple horizontal dynamometer springs 6 are provided between 5, multiple horizontal dynamometer springs 6 are located in same perpendicular, and are equidistantly set Put.Each horizontal dynamometer spring 6 is outer to be socketed with horizontally-guided pipe 7, and the two ends of horizontally-guided pipe 7 are separately fixed at inner side permanent magnet 17 and outside permanent magnet 19 on, between horizontal dynamometer spring 6 and inner side permanent magnet 17 and outside permanent magnet 19 set insulation.

As shown in Fig. 5, Fig. 6, Fig. 7, in vertical main dynamometer spring 1, vertical dynamometer spring 2 and horizontal dynamometer spring 6 Be respectively equipped with iron core 15,16,18, the lateral surface of iron core 15,16,18 be along the circumferential direction uniformly provided with some it is axially arranged along iron core Slide rail 23, vertical main dynamometer spring 1, vertical dynamometer spring 2 and the inner side of horizontal dynamometer spring 6 set along spiral even circumferential There are some guiding elastic bearings 20, it is the axially arranged support bar of uprighting spring to be oriented to elastic bearing 20, is oriented to elastic bearing 20 Can be adapted to slide rail 23, be slidably connected between the two, local overlap joint does not influence telescopic spring rigidity.What is be socketed on spring stretches The conduit of contracting only provides the rigidity protection of spring side, and the elastic direction deformation of spring is not influenceed.

As shown in figure 8, above-mentioned high-precision three-dimensional soil pressure testing device also includes power supply 21, switch 22, power supply connects respectively Connect vertical main dynamometer spring 1, vertical dynamometer spring 2, the two ends of horizontal dynamometer spring 6.By controlling electric power outputting current Size is come the magnetic pole and top board permanent magnet 13 and base plate permanent magnet 14 that control main dynamometer spring 1 and vertical dynamometer spring 2 to be formed Between repulsive interaction, and magnetic pole and horizontal inner side permanent magnet 17 and the horizontal outer side permanent magnetism that controlled level dynamometer spring 6 is formed Repulsive interaction between iron 19, realizes that test device range is adjusted.

As shown in figure 9, a kind of range adjustment system of high-precision three-dimensional soil pressure testing device should also including some optical fiber Variant displacement meter, optical fiber modulation /demodulation instrument, data collecting instrument, data analysis system and control system.Power supply 21 is connected respectively Vertical main dynamometer spring 1, vertical dynamometer spring 2, the two ends of horizontal dynamometer spring 6, fibre strain formula displacement meter are vertically arranged On base plate permanent magnet 14 and each outside permanent magnet 19.Optical fiber modulation /demodulation instrument connects each fibre strain formula position by optical fiber Meter is moved, the signal output of each fibre strain formula displacement meter is transferred to data analysis system by data collecting instrument.

First, according to MTD, soil body physical parameter, by theoretical calculation, the initial stiffness of dynamometer spring is set.It is logical The displacement that fibre strain formula displacement meter is measured in horizontal dynamometer spring and vertical dynamometer spring certain hour is crossed, via data analysis System, obtains the change in displacement rate of the soil body to be measured, according to actual measurement land movement rate of change, can calculate the soil body in certain hour Displacement variable, is judged in certain hour with this, and can test device meet test request.If it was found that the displacement of test device Cheng Buneng meets, i.e., range transfinites, and can be classified as thin tail sheep, middle displacement, big displacement according to measured displacements amount in certain hour, According to thin tail sheep, middle displacement, the value of big displacement, corresponding current threshold is set, electric power outputting current is controlled on this basis Size, the input value of the corresponding electric current of corresponding shift value is set respectively to control energization spring and the magnetic field produced by iron core Intensity, the principle of the power according to produced by magnetic pole of the same name repels each other, the energization spring of built-in iron core is by the permanent magnet with both ends of the spring Magnetic field force is produced, the control and regulation of the required range of soil pressure testing device are realized with this.Appropriate regulation test device Range, it is to avoid soil pressure testing device changes because of external environmental condition, cause the range of soil pressure testing device too it is small be difficult to it is full The smart demand of foot test, range it is too big and survey land movement it is smaller when be difficult to ensure that the problem of measuring accuracy, realize surveying with this The controllability of examination.

The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should It is considered as protection scope of the present invention.

Claims (7)

1. a kind of high-precision three-dimensional soil pressure testing device, it is characterised in that:Including vertical main dynamometer spring (1), some levels Dynamometer spring (6), base plate (12), inner cylinder (5), central deck (11), side top board (10) and some outer panels (8);Wherein, institute The center for stating base plate (12) is fixed with base plate permanent magnet (14), and the central deck (11) is circle, solid on its medial surface Surely there is top board permanent magnet (13);Through hole is provided with the middle of the side top board (10), the diameter of the through hole is interior with the inner cylinder (5) The diameter of footpath and the central deck (11) is consistent, and the central deck (11) is arranged in the middle of the side top board (10) In through hole;
The vertical main dynamometer spring (1) is vertically fixed on the base plate permanent magnet (14), and the inner cylinder (5) is enclosed within described perpendicular To main dynamometer spring (1) outward, and it is vertically fixed on the base plate (12), top and the side top board of the inner cylinder (5) (10) it is affixed;Central deck (11) side is provided with the upright slide rail for matching with the medial surface of the inner cylinder (5);If described Dry outer panel (8) is vertically arranged in the inner cylinder (5) outward with circle ring array interval, is connected using flexible between adjacent outer plate (8) (9) connection is connect, inner side permanent magnet (17) is fixed with inner cylinder (5) lateral wall, it is solid on every piece of outer panel (8) madial wall Surely there is outside permanent magnet (19), the horizontal dynamometer spring (6), institute are set between every piece of outer panel (8) and inner cylinder (5) The two ends for stating horizontal dynamometer spring (6) are separately fixed on the inner side permanent magnet (17) and outside permanent magnet (19);Every piece institute State the horizontal slide rail for being provided between the both ends of outer panel (8) and side top board (10) and base plate (12) and being matched.
2. high-precision three-dimensional soil pressure testing device according to claim 1, it is characterised in that:Also include some vertical times Dynamometer spring (2), the vertical dynamometer spring (2) in the inner cylinder (5), around the vertical main dynamometer spring (1) with Circle ring array interval is vertically arranged, and its bottom is fixed on the base plate permanent magnet (14);Every piece of outer panel (8) with it is interior Multiple horizontal dynamometer springs (6) are provided between cylinder (5), multiple horizontal dynamometer springs (6) are positioned at same flat vertically In face, and spaced set.
3. high-precision three-dimensional soil pressure testing device according to claim 2, it is characterised in that:The vertical main dynamometry bullet Spring (1), vertical setting insulation, the water between dynamometer spring (2) and top board permanent magnet (13) and base plate permanent magnet (14) Insulation is set between flat dynamometer spring (6) and inner side permanent magnet (17) and outside permanent magnet (19).
4. the high-precision three-dimensional soil pressure testing device according to Claims 2 or 3, it is characterised in that:The vertical main survey Iron core (15,16,18), the iron are respectively equipped with power spring (1), vertical dynamometer spring (2) and horizontal dynamometer spring (6) Core (15,16,18) lateral surface is along the circumferential direction uniformly provided with some along the axially arranged slide rail of iron core (23), the vertical master Dynamometer spring (1), vertical dynamometer spring (2) and horizontal dynamometer spring (6) inner side are uniformly provided with some leading along spiral circumference To elastic bearing (20), guiding elastic bearing (20) can be adapted to the slide rail (23).
5. high-precision three-dimensional soil pressure testing device according to claim 4, it is characterised in that:The vertical main dynamometry bullet Conduit is equipped with outside spring (1), vertical dynamometer spring (2) and horizontal dynamometer spring (6).
6. high-precision three-dimensional soil pressure testing device according to claim 4, it is characterised in that:It is the base plate (12), interior Cylinder (5), central deck (11), side top board (10) and outer panel (8) are epoxy glass fiber plate.
7. a kind of range of the high-precision three-dimensional soil pressure testing device according to Claims 2 or 3 adjusts system, its feature It is:Including power supply, some fibre strain formula displacement meters, optical fiber modulation /demodulation instrument, data collecting instrument, data analysis system and Control system;The power supply connects the vertical main dynamometer spring (1), vertical dynamometer spring (2), horizontal dynamometer spring respectively (6) two ends, the fibre strain formula displacement meter is vertically set on the base plate permanent magnet (14) and each outside permanent magnet (19) on;The optical fiber modulation /demodulation instrument connects each fibre strain formula displacement meter by optical fiber, each fibre strain formula displacement The signal output of meter is transferred to the data analysis system by the data collecting instrument, and the data analysis system is used to calculate Go out land movement rate of change and further calculate the displacement variable of the soil body in certain hour;The control system is according to The displacement variable of the soil body in certain hour, the main dynamometer spring (1) is controlled by controlling the size of electric power outputting current And the magnetic pole and the repulsive interaction between top board permanent magnet (13) and base plate permanent magnet (14) of vertical dynamometer spring (2) formation, with And control the magnetic pole that the horizontal dynamometer spring (6) is formed and horizontal inner side permanent magnet (17) and horizontal outer side permanent magnet (19) it Between repulsive interaction, realize test device range adjust.
CN201710020619.2A 2017-01-12 2017-01-12 A kind of high-precision three-dimensional soil pressure testing device and its range adjust system CN106840472B (en)

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CN201710020619.2A CN106840472B (en) 2017-01-12 2017-01-12 A kind of high-precision three-dimensional soil pressure testing device and its range adjust system

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005017163A (en) * 2003-06-27 2005-01-20 Toko Inc Displacement sensor and pressure measuring device using it
US20140331787A1 (en) * 2012-01-12 2014-11-13 Stichting Voor De Technische Wetenschappen Six-axis force-torque sensor
CN104372783A (en) * 2014-10-24 2015-02-25 中铁二十四局集团有限公司 High-sensitivity foundation pit side wall pressure testing device
CN204286436U (en) * 2014-12-18 2015-04-22 长安大学 A kind of total powerstation assists levelling device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005017163A (en) * 2003-06-27 2005-01-20 Toko Inc Displacement sensor and pressure measuring device using it
US20140331787A1 (en) * 2012-01-12 2014-11-13 Stichting Voor De Technische Wetenschappen Six-axis force-torque sensor
CN104372783A (en) * 2014-10-24 2015-02-25 中铁二十四局集团有限公司 High-sensitivity foundation pit side wall pressure testing device
CN204286436U (en) * 2014-12-18 2015-04-22 长安大学 A kind of total powerstation assists levelling device

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