CN201532280U

CN201532280U - Three-way vibratory string type sensor for synchronously measuring water pressure and soil pressure

Info

Publication number: CN201532280U
Application number: CN200920247116XU
Authority: CN
Inventors: 吴顺川; 高永涛
Original assignee: University of Science and Technology Beijing USTB
Current assignee: University of Science and Technology Beijing USTB
Priority date: 2009-11-23
Filing date: 2009-11-23
Publication date: 2010-07-21
Anticipated expiration: 2019-11-23

Abstract

The utility model provides a three-way vibratory string type sensor for synchronously measuring water pressure and soil pressure, which belongs to the field of civil engineering works testing instrument. Inside part of the utility model is divided into three working chambers with identical spacing geometric size and one leader cable chamber by a metal baffle, and the cube is composed of three working diaphragms, three non-working diaphragms and one rigid diaphragm. A working diaphragm is used for inducing water pressure, and the outer is installed with a rigid diaphragm, and the rigid diaphragm has through-holes, and the inner side of the rigid diaphragm is equipped with a pervious stone or a micropore filtering net, and a water pressure acting spacing is equipped between the working diaphragm and the pervious stone or the micropore filtering net; the other working diaphragms are used for sensing soil pressures at vertical and horizontal direction. The working diaphragm contacts the pressure to be measured immediately, when the pressure changes, the diaphragm can sense the acting force and generates a bending flexure deformation, thereby driving the two stands to depart to the double sides, and the vibratory string is tightened, and the frequency changes, so the pressure can be measured according to variation of frequency. The utility model can simultaneously measure water pressure, vertical soil pressure and horizontal soil pressure in the sensor buried position, and is suitable for highway, building, mining and other departments, and has the advantages of expedience, simple structure and low fabrication cost.

Description

The three-dimensional vibrating string type sensor of a kind of synchro measure water pressure and soil pressure

Technical field

The utility model belongs to the civil engineering work field of test instrument, relates to the water pressure of synchro measure sensor burial place, vertically reaches horizontal earth pressure.

Background technology

At present, the vibrating string type sensor that utilizes resonance principle to design can only be measured the external pressure of single direction.In Construction of Civil Engineering, this class vibrating wire pressure sensor is usually used in measuring the stratum soil pressure, presses sensors such as meter as type vibration wire soil pressure cell, hole.Vibrating string type sensor commonly used is simple in structure, cheap, can satisfy certain engineering survey needs.But following weak point is arranged:

1) because this class sensor has only a vibratory string, only can measure the pressure of single direction, i.e. the force value of working masks normal direction.

2) when having underground water to exist in the soil body, also can produce pore water pressure.Utilize traditional vibrating string type sensor can't synchro measure pore water pressure size when measuring soil pressure, can only adopt independent pore pressure gauge to measure.

The utility model content

The purpose of this utility model is to overcome the deficiency of traditional vibrating string type sensor, design pore water pressure, vertical earth pressure and the horizontal earth pressure that to measure the sensor burial place simultaneously according to resonance principle, and it is easy to process, simple in structure, cheap.

The utility model profile is a cube structure, principal character is: inside is divided into three C1 of work chamber, C2, C3 and leader cable cavity C 4 that space geometry is measure-alike by metal partion (metp), and the cube outside is made up of working masks 8, working masks 17, working masks 18, inoperative diaphragm 13, inoperative diaphragm 19, inoperative diaphragm 20 and rigid membrance 12.Wherein, all be separately installed with support 6 and coil 2 on each working masks, vibratory string support 6 tops link to each other with working masks, and the bottom links to each other with vibratory string 1.Each working masks directly contacts with measured acting force.Working masks 8 is used to respond to water pressure, a rigid membrance 12 is installed in its outside, on rigid membrance 12, be provided with through hole 14, installed inside permeable stone or micro-strainer 15, and leave hydraulic action space 16 between permeable stone or micro-strainer 15 and the working masks 8, be used to avoid soil pressure to act on the influence of the distortion of generation on the rigid membrance 12 to working masks 8, rigid membrance 12 is made by the stronger material of non-deformability.Working masks 17 is used to respond to the soil pressure of vertical direction.Working masks 18 is used for the soil pressure of sensation level direction.

Be provided with same structure among the C1 of work chamber, C2 and the C3, and respectively vibrating wire sensor be housed, and the measured acting force of vibrating wire sensor is different in three chambers.Vibrating wire sensor in the cavity C 3 is used to measure pore water pressure, and the vibrating wire sensor in the cavity C 2 is used to measure horizontal earth pressure, and the vibrating wire sensor among the top chamber C1 is used for the measuring vertical soil pressure.

A rigid membrance is installed in the working masks outside at the C3 of work chamber, as Fig. 1, Fig. 2, Fig. 3, shown in Figure 4.Rigid membrance is provided with through hole, and installed inside permeable stone or micro-strainer leave the hydraulic action space between permeable stone or micro-strainer and the working masks.The distortion that the hydraulic action space can be avoided soil pressure to act on producing on the rigid membrance is to the influence of working masks, thereby stops propagation of earth pressure to working masks.Like this, only there is pore water to flow in the hydraulic action space by through hole and permeable stone or micro-strainer, act directly on the working masks, thereby make the vibrating wire sensor in the cavity C 3 can not be subjected to the influence of soil pressure and directly measure the pore water pressure value, thereby realize the pore water pressure at synchro measure sensor burial place place, the purpose of vertical and horizontal earth pressure.

During measurement, by a pulse current, the permanent magnet in the coil 2 holds vibratory string 1 in the coil 2, and after pulse current disappeared, vibratory string 1 was released generation vibration, and the magnetic field of sectioned coil 2, and the induction current of generation is exported from coil 2.

In the working sensor process, diaphragm with directly contacted by measuring pressure, promptly diaphragm is experienced pressure and deflection deformation is taken place, thereby driving two vibratory string supports draws back to both sides, vibratory string is tightened up, so the vibration frequency of vibratory string changes, can measure the size of acting force according to the variable quantity of vibratory string frequency.

Among the present invention three cover sensing arrangement all is placed in the independent cavity, and shields with the shielded pair external magnetic field, can reduce the interference of external magnetic field and the mutual interference mutually in sensor internal magnetic field.

Advantage of the present utility model be can synchro measure sensor burial place place pore water pressure, vertical earth pressure and horizontal earth pressure, thereby grasp the water pressure state and the soil body stress state at observation station place.

Description of drawings

Fig. 1-cube box body internal chamber structure and vibratory string arranged direction figure

Fig. 2-C1-C3 chamber sectional view

Fig. 3-rigid membrance design drawing

Fig. 4-C1 chamber section top cover (working masks and string wire) upward view

Among the figure: 1-vibratory string, 2-coil, 3-shielding line, 4-electric current line, 5-cable, 6-support, 7-vibratory string clamp device, 8-working masks, 9-crossbeam, 10-wire connector, 11-metal partion (metp), 12-rigid membrance, 13-inoperative diaphragm, 14-through hole, 15-permeable stone or micro-strainer, 16-hydraulic action space, 17-working masks, 18-working masks, 19-inoperative diaphragm, 20-inoperative diaphragm.

Embodiment

Further specify the utility model below in conjunction with accompanying drawing.

Figure 1 shows that synchro measure water pressure and soil pressure three-dimensional vibrating string type sensor, form by three C1 of work chamber, C2, C3 and a leader cable cavity C 4.Vibratory string 1 is arranged along each working masks diagonal.

Fig. 2 is a C1-C3 chamber sectional view, and three working masks are used to accept external pressure, and three inoperative diaphragms are used for fixing other member and form sensor integral body.The inside of sensor is divided into three work chamber and a leader cable chamber by metal partion (metp), wherein mainly comprises with the lower part in each work chamber: the working masks that is used to accept ambient pressure; A coil and two supports along the inboard diagonal of working masks is arranged all are equipped with the vibratory string clamp device on the support, coil is positioned at the center of diaphragm, and support is positioned at coil two sides; Connect the vibratory string between two vibratory string clamp devices, vibratory string and coil spacing 0.5～2mm; A crossbeam that is used for fixing wire connector, crossbeam two ends are individually fixed on metal partion (metp) and the inoperative diaphragm; Wire connector is installed on the crossbeam; Two electric current lines are connected on the wire connector, and a shielding line is connected on the crossbeam, and three lines are combined as a cable, pass the metal partion (metp) between work chamber and the leader cable chamber, receive to the leader cable chamber.The cable of three work chamber merges at the leader cable chamber, and current signal is reached the sensor outside.During measurement, each working masks of cube directly contacts with the pressure that needs to measure.When pressure changed, each working masks was promptly experienced pressure and deflection deformation is taken place, and drew back to both sides thereby drive two supports 6, and vibratory string 1 is tightened up, so the frequency of vibratory string 1 changes.But size according to the variable quantity gaging pressure of vibratory string 1 frequency.C1 chamber working masks 17 directly contacts with the soil body, is used to respond to soil body pressure at right angle.C3 chamber working masks 8 outsides are equipped with rigid membrance 12.Be equipped with through hole 14 on the rigid membrance 12, installed inside permeable stone or micro-strainer 15, and leave hydraulic action space 16 between permeable stone or micro-strainer 15 and the working masks 8, soil body pore water pressure can act directly on the working masks 8 by through hole 14 and permeable stone or micro-strainer 15.

Fig. 3 is rigid membrance 12 design drawings, and through hole 14 evenly is laid on the rigid membrance 12 among the figure, makes working masks 8 evenly bear the effect of pore water pressure.

Fig. 4 is a C1 chamber section top cover upward view, shows the relative position relation of vibratory string 1, coil 2, support 6 and working masks 17.

In the manufacturing of synchro measure water pressure and soil pressure three-dimensional vibrating string type sensor, at first make the metal partion (metp) 11 that chamber is cut apart in cube box body inside, because the space complexity of the diaphragm structure of each chamber is cut apart in design box body inside, can make single separator plate to diaphragm structure by design size respectively by the plane, the dividing plate punching earlier of threading hole is arranged.Then, ready-made each single separator plate by being welded together, is formed an integral body.

Three working masks and three inoperative diaphragms of cube shell can be divided into six monolithic planar diaphragms, and wherein three working masks are equipped with vibratory string 1 earlier.Three working masks that the fixing vibratory string clamp device 7 of vibratory string 1 is installed can be by designing and producing, will be wherein two connect with bolt by punching by welding or in the junction and bind with cementing agent, form whole.Other three not with the

inoperative diaphragm

13,19,20 of vibratory string 1 can with set box body internal partition structure by being welded together, also or connect with bolt by punching in the junction and bind with cementing agent.Then three crossbeams 9 that have a wire connector 10 by screw or be weldingly fixed on box body indoor design position, and stube cable.With the 3rd working masks that installs vibratory string 1,, be installed together with the part of originally making by bolt or welding.

Permeable stone or micro-strainer 15 are installed in rear flank in the rigid membrance 12, with rigid membrance 12 by bolt or welded and installed surface at C3 chamber working masks 8.

The synchro measure water pressure that completes and the three-dimensional vibrating string type sensor of soil pressure can be used for the while survey sensor and bury the pore water pressure at place, vertical and horizontal earth pressure underground, are applicable to departments such as highway, building, mining industry.The utility model is easy to process, simple in structure, cheap.

Claims

1. the three-dimensional vibrating string type sensor of synchro measure water pressure and soil pressure, profile is a cube structure, it is characterized in that, innerly is divided into three C1 of work chamber, C2, C3 and leader cable cavity C 4 that space geometry is measure-alike by metal partion (metp); The cube outside is made up of working masks (8,17,18), inoperative diaphragm (13,19,20) and rigid membrance (12), wherein, all be separately installed with support (6) and coil (2) on each working masks, vibratory string support (6) top links to each other with working masks, and the bottom links to each other with vibratory string (1); A rigid membrance (12) is installed in the outside of working masks (8), on rigid membrance (12), be provided with through hole (14), installed inside permeable stone or micro-strainer (15), and leave hydraulic action space (16) between permeable stone or micro-strainer (15) and the working masks (8).

2. the three-dimensional vibrating string type sensor of a kind of synchro measure water pressure as claimed in claim 1 and soil pressure, it is characterized in that, the C1 of work chamber, C2 and C3 are provided with same structure, and vibrating wire sensor is housed respectively, vibrating wire sensor in the cavity C 3 is used to measure pore water pressure, vibrating wire sensor in the cavity C 2 is used to measure horizontal earth pressure, and the vibrating wire sensor among the top chamber C1 is used for the measuring vertical soil pressure.