CN108088417A - A kind of foundation pit enclosure structure high-precision detection system and detection method - Google Patents
A kind of foundation pit enclosure structure high-precision detection system and detection method Download PDFInfo
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- CN108088417A CN108088417A CN201711428525.5A CN201711428525A CN108088417A CN 108088417 A CN108088417 A CN 108088417A CN 201711428525 A CN201711428525 A CN 201711428525A CN 108088417 A CN108088417 A CN 108088417A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C9/00—Measuring inclination, e.g. by clinometers, by levels
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/32—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring the deformation in a solid
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Testing Or Calibration Of Command Recording Devices (AREA)
Abstract
The invention discloses a kind of foundation pit enclosure structure high-precision detection system and detection methods, the high-precision detection system includes inclinometer pipe, the probe in inclinometer pipe, the plate reading connected with probe and the control centre being connected with plate reading, air bag is arranged on each probe, it is attached to after airbag aeration expansion on deviational survey inside pipe wall, multiple probes can be in turn connected to form probe group, and the probe of probe group wherein one end is connected with plate reading.By the way that multiple probes are in turn connected to form probe group, the different position in each corresponding inclinometer pipe of probe can once measure the inclination conditions of multiple positions, substantially increase measurement efficiency, be monitored in real time by plate reading and control centre in addition；Once mounting high-precision detection system can use in entire construction period simultaneously, by airbag aeration probe can be made to be attached on deviational survey inside pipe wall, not only easy to operate, and without manually lifting, and avoid the problem that there are errors so as to which precision be caused to be difficult to control；The present invention is simple in structure using air inflated structure.
Description
Technical field
The present invention relates to foundation pit construction fields, and in particular to a kind of foundation pit enclosure structure high-precision detection system and detection side
Method.
Background technology
With the fast development of urbanization process, foundation pit scale and cutting depth are continuously increased, the safety problem of deep basal pit
As the factor of engineering construction overriding concern.Because the soil body, building and embedded object around excavation of foundation pit can be to foundation pit enclosures
The extruding such as the structure wall (abbreviation foundation pit enclosure wall, such as diaphram wall) of wall, cause the deformation of foundation pit enclosure wall, so
Foundation pit enclosure wall is detected during foundation pit construction, to carry out support to it when the deformation of foundation pit enclosure wall is excessive
Axle power bit shift compensation is to control or reduce the displacement deformation of fender body.
Current deformation detection technology is mainly detected using inclinometer.Existing inclinometer is mainly by popping one's head in, surveying
Read instrument, cable and four part of inclinometer pipe composition.The inclinometer pipe is embedded in foundation pit enclosure within the walls in advance, and the probe is located at the deviational survey
In pipe, the probe is connected by cable with the plate reading.In use, by manually above carrying or lower payout, will pop one's head in
The different position of the inclinometer pipe is respectively placed in, to measure the deformation of the inclinometer pipe different position respectively.Wherein, institute
Stating probe includes two guide wheel strainers and is equipped with the agent structure of inclinometer wiring board, and the guide wheel strainer includes leading
The guide wheel is pressed in the groove of the inclinometer pipe by wheel nutted rod, two guide wheels and spring leaf, the spring leaf always, institute
The measurement data that probe can be read in plate reading is stated, preserve and handle measurement data and is powered to probe.However existing probe is all
Be to lift to determine position up and down by cable, can only once detect the data of a position, inefficiency, and fail to accomplish with
Inclinometer pipe consolidates connection, can not also be interconnected to form probe group to detect the angle of inclination of inclinometer pipe different position, therefore more
To get over the requirement that cannot meet the efficient of modern construction measurement, high quality, high-precision and automation.
The content of the invention
The present invention provides a kind of foundation pit enclosure structure high-precision detection system and detection method, to solve in the prior art
Existing can not be consolidated with inclinometer pipe is connected and can not be interconnected to form probe group to detect inclinometer pipe different position simultaneously
Angle of inclination the problem of.
In order to solve the above-mentioned technical problem, the technical scheme is that：A kind of foundation pit enclosure structure high-precision detection system
System, the plate reading and connect with the plate reading that probe and the probe including inclinometer pipe, in the inclinometer pipe connect
The control centre connect is each arranged with air bag, the deviational survey inside pipe wall is attached to after the airbag aeration expansion on the probe
On, multiple probes can be in turn connected to form probe group, and the probe group wherein probe of one end is connected with the plate reading.
Further, the probe includes interconnected upper cavity and lower chamber, positioned at the upper cavity and lower chamber
Deviational survey pcb board between inside, the air bag are sheathed on respectively on the upper cavity and lower chamber, and the upper cavity is away from described
One end of lower chamber is also connected with tracheae, and the one end of the tracheae away from the upper cavity is equipped with connector, and the lower chamber is separate
The one side of the upper cavity is equipped with the connecting tube being adapted to the connector, and the deviational survey pcb board is connected with plate reading.
Further, the deviational survey pcb board includes sequentially connected deviational survey circuit, cable and plug, the plug bag
Male plug and female are included, is divided into the both sides up and down of the deviational survey circuit, the deviational survey circuit includes multiple integrated electricals member
Part, it is automatic to detect angle of inclination and export signal；The cable includes 2 power cords and 2 data lines, and the plug is fast
Connection-peg.
Further, the plate reading includes data collector, the data display equipment being connected with the data collector, confession
Electric module, air valve and the supply module being connected with the air valve, the data collector are connected with the data cable, the confession
Electric module is connected with the power cord, and the supply module is connected with the tracheae.
Further, the control centre includes data processing unit and alarm unit, the data processing unit and institute
State data collector connection.
Further, pressure ring, the upper cavity and corresponding air bag outside and the cavity of resorption are equipped on the outside of the air bag
Housing is respectively equipped on the outside of body and corresponding air bag, is connected respectively by screw thread between the housing and the upper cavity and lower chamber
It connects.
Further, locating ring is set between the upper cavity and lower chamber, if the locating ring is equipped with bolt stem
Hole, the bolt hole are built-in with connection bolt, and the joint location of the upper cavity and lower chamber is additionally provided with sealing ring.
Further, the tracheae includes rubber tube and seal washer, and the rubber tube passes through sealing with the upper cavity
Washer and nut airtight connection.
The present invention also provides a kind of detection method of foundation pit enclosure structure high-precision detection system as described above, including with
Lower step：
S1：Pre-buried several inclinometer pipes when pouring the enclosure wall of foundation pit；
S2：According to the depth of enclosure wall, the quantity of required probe is calculated, and required probe is in turn connected into probe
Group；
S3：The probe group is placed in the inclinometer pipe and inflation makes probe group be attached to deviational survey inside pipe wall into air bag
On, it is measured with the tilt data of the different position to inclinometer pipe, the plate reading obtains the inclination of inclinometer pipe different position
Data, and it is uploaded to the control centre；
S4：The tilt data situation of change of each position of control centre's monitoring inclinometer pipe, when the inclination of some position
When data exceed default early warning value, alarm is carried out；The change figurate number of each position is calculated according to tilt data variation simultaneously
According to and draw deformation curve；
S5：The foundation pit enclosure structure high-precision detection system is removed after the completion of foundation pit construction.
Further, in the step S2, the connection method between adjacent probes is：By the deviational survey pcb board of two probes
Plug be mutually butted, and the connector of the connecting tube of one of which and another one is attached, and the surveys of this two probes
Data are measured to transfer by the data cable in plug.
Foundation pit enclosure structure high-precision detection system provided by the invention and detection method, compared with prior art, exist with
Lower advantage：
(1) by the way that multiple probes are in turn connected to form probe group, the different position in each corresponding inclinometer pipe of probe, one
The secondary inclination conditions that can measure multiple positions, substantially increase measurement efficiency, are carried out in addition by plate reading and control centre
Monitoring is, it can be achieved that 24 monitor in real time when small in real time；
(2) once mounting high-precision detection system can use in entire construction period, can be made by airbag aeration
Probe is effectively attached on deviational survey inside pipe wall, not only easy to operate, and without manually lifting, is existed when avoiding artificial lifting and missed
The problem of difference is so as to cause precision to be difficult to control；
(3) using air inflated structure, structure is simpler, and it is more convenient that manufacture is safeguarded.
Description of the drawings
Fig. 1 is the structure diagram of foundation pit enclosure structure high-precision detection system of the present invention；
Fig. 2 is operating diagram of the foundation pit enclosure structure high-precision detection system of the present invention for more inclinometer pipes；
Fig. 3 is the structure diagram that the present invention pops one's head in；
Fig. 4 is the sectional view that the present invention pops one's head in；
Fig. 5 is the structure diagram of deviational survey pcb board of the present invention；
Fig. 6 is the schematic diagram that present invention probe is attached on inclinometer pipe；
Fig. 7 is plate reading of the present invention and the structure diagram of control centre.
Shown in figure：10th, inclinometer pipe；
20th, pop one's head in；210th, air bag；211st, pressure ring；212nd, housing；220th, upper cavity；221st, tracheae；222nd, rubber tube；
223rd, nut；230th, lower chamber；240th, deviational survey pcb board；241st, deviational survey circuit；242nd, cable；243rd, male plug；244th, female plug
Head；251st, connector；252nd, connecting tube；260th, locating ring；261st, bolt is connected；270th, lock washer；
30th, plate reading；310th, data collector；320th, data display equipment；330th, power supply module；340th, air valve；350th, supply
Gas module；
40th, control centre；410th, data processing unit；420th, alarm unit.
Specific embodiment
The present invention is described in detail below in conjunction with the accompanying drawings：
As shown in Figs. 1-2, the present invention provides a kind of foundation pit enclosure structure high-precision detection system, including inclinometer pipe 10,
It probe 20 in the inclinometer pipe 10, the plate readings 30 being connected with the probe 20 and is connected with the plate reading 30
Control centre 40 is each arranged with air bag 210 on the probe 20, the deviational survey is attached to after 210 inflation of air bag
On the inner wall of pipe 10, multiple probes 20 can be in turn connected to form probe group, the probe 20 of the probe group wherein one end with
The plate reading 30 connects.Specifically, when in use, several probes 20 are in turn connected to form by spy according to the length of inclinometer pipe 10
Head group, and the probe group is placed in inclinometer pipe 10, the probe 20 of the top is made to be connected with plate reading 30, by each probe
Air bag 210 in 20 is inflated, it is made to be attached to after expanding on the inner wall of inclinometer pipe 10, as shown in fig. 6, probes 20 different at this time
Different position in corresponding inclinometer pipe 10, therefore the tilt data of different position can be measured, and the tilt data can pass through
Connector between adjacent probes 20 is transferred, i.e. the measurement data of probe 20 is transferred successively from the bottom to top, eventually by most upper
The probe 20 of side passes to plate reading 30, and plate reading 30 can obtain the measurement data of all probes 20, and by the measurement of acquisition
Data are uploaded to control centre 40 and are monitored in real time, as indicated with 2, when inclinometer pipe 10 has more, in every inclinometer pipe 10
If there are one probe group, each probe group corresponds to a plate reading 30, and multiple plate readings 30 correspond to a control centre 40, at this time
Control centre 40 can monitor the tilt data of different position in more inclinometer pipes 10 simultaneously, when the tilt data of some position surpasses
When going out default early warning value, control centre 40 can send alarm.
As shown in Figure 3-4, the probe 20 includes interconnected upper cavity 220 and lower chamber 230, positioned at the epicoele
Deviational survey pcb board 240 between 230 inside of body 220 and lower chamber, the air bag 210 are sheathed on the upper cavity 220 under respectively
On cavity 230, the one end of the upper cavity 220 away from the lower chamber 220 is also connected with tracheae 221, and the tracheae 221 is away from institute
State upper cavity 220 one end be equipped with connector 251, one side of the lower chamber 230 away from the upper cavity 220 be equipped with it is described
The connecting tube 252 that connector 251 is adapted to, the deviational survey pcb board 240 are connected with plate reading 30.Specifically, multiple probes 20 pass through
Connector 251 and the connection of connecting tube 252 form probe group, connect between each other, air bag 210 is sheathed on 220 He of upper cavity respectively
It on lower chamber 230, and is interconnected between upper cavity 220, lower chamber 230 and air bag 210, for multiple 20 connection shapes of probe
Into probe group, by the tracheae 221 into the probe 20 of the top inflate can be realized to it is all probe 20 in air bag
210 are inflated, and in the present embodiment, connector 251 uses attaching nut, is threadedly coupled between connecting tube 252；Air bag 210
It is made of elastic rubber, elasticity is good, solid wear-resisting and of low cost.
Preferably, the tracheae 221 include rubber tube 222 and seal washer (not marked in figure), the rubber tube 222 with
The upper cavity 220 avoids gas leakage by 223 airtight connection of seal washer and nut.
Preferably, 210 outside of air bag is equipped with pressure ring 211, and the pressure ring 211 is made of copper, good toughness, for making
Air bag 210 preferably fits together with upper cavity 220.The upper cavity 220 and the outside of corresponding air bag 210 and it is described under
Cavity 230 and 210 outside of corresponding air bag are respectively equipped with housing 212, the housing 212 and the upper cavity 220 and lower chamber
It is connected through a screw thread respectively between 230, is tightened by screw thread and the pressure ring 211 is promoted preferably to compress the air bag 210 and institute
The gap between upper cavity 220 or lower chamber 230 is stated, avoids gas leakage.
Preferably, locating ring 260 is set between the upper cavity 220 and lower chamber 230, is set on the locating ring 260
There are several bolts hole, the bolt hole, which is built-in with, connects bolt 261, and the joint location of the upper cavity 220 and lower chamber 230 is also
It (is not marked in figure) equipped with sealing ring.Specifically, locating ring 260 is sleeved on to the connector position of upper cavity 220 and lower chamber 230
It puts, and passes through and connect bolt 261 the two is fixed as one, in order to avoid link position gas leakage, set in the joint location of the two
Sealing ring is put, ensures sealing effect.
Preferably, the deviational survey pcb board 240 is fixed on the upper cavity 220 and lower chamber 230 by lock washer 270
Between.As shown in Figure 5, it is preferred that the deviational survey pcb board 240 includes sequentially connected deviational survey circuit 241, cable 242 and inserts
Head, the plug include male plug 243 and female 244, are divided into the both sides up and down of deviational survey circuit 241, i.e. male plug 243 is logical
The upside that cable 242 connects deviational survey circuit 241 is crossed, female 244 connects the downside of deviational survey circuit 241 by cable 242,
As shown in Figure 5；Can certainly be the downside that male plug 243 connects deviational survey circuit 241 by cable 242, female 244 is logical
The upside that cable 242 connects deviational survey circuit 241 is crossed, facilitates the connection of cable 242 after multiple attached wall probe apparatus connection bunchiness
It connects and is transferred with information.The deviational survey circuit 241 includes multiple Integration of electrical components, automatic to detect angle of inclination and export signal；
The cable 242 includes 4 lines, wherein 2 are power cord, for powering to deviational survey circuit 241,2 are data cable, are used for
The output of deviational survey information；The plug is quick connector, can quick grafting.
As shown in fig. 7, the data that the plate reading 30 includes data collector 310, is connected with the data collector 310
Display 320, power supply module 330, air valve 340 and the supply module 350 being connected with the air valve 340, the data acquisition
Device 310 is connected with the data cable, and for gathering the data of the measurement of deviational survey pcb board 240, data display equipment 320 is used for data
The data that collector 310 gathers carry out real-time display.Power supply module 330 is connected with power cord, and deviational survey circuit 241 is powered
Control, the supply module 350 are connected with the tracheae 240, and opening air valve 340 can inflate into tracheae 240.
Fig. 7 is continued referring to, the control centre 40 includes data processing unit 410 and alarm unit 420, the data
Processing unit 410 is connected with the data collector 310.Control centre 40 monitors that the tilt data of 10 each position of inclinometer pipe becomes
When the tilt data of some position exceeds default early warning value, alarm is carried out by alarm unit 420 for change situation；Together
When data processing unit 410 can according to tilt data change calculate each position deformation data and draw deformation curve.
The present invention also provides a kind of detection method of foundation pit enclosure structure high-precision detection system as described above, including with
Lower step：
S1：Pre-buried several inclinometer pipes 10 when pouring the enclosure wall of foundation pit；
S2：According to the depth of enclosure wall, the quantity of required probe 20 is calculated, and required probe 20 is in turn connected into spy
Head group；Connection method between adjacent probes is：The plug of the deviational survey pcb board of two probes 20 is mutually butted, it will be wherein
The male plug 243 of one is attached with another female 244, and power cord and data cable therein are connected respectively,
The measurement data of this two probes 20 is transferred by data cable in plug, and by the connecting tube 252 and another one of one of which
Connector 251 be attached.
S3：20 groups of the probe is placed in the inclinometer pipe 10 and inflation makes probe group be attached to survey into air bag 210
It on 10 inner wall of inclined tube, is measured with the tilt data of the different position to inclinometer pipe 10, the plate reading 30 obtains inclinometer pipe
The tilt data of 10 different positions, and it is uploaded to the control centre 40；Specifically, when multiple 20 connections of probe form a spy
During head group, it is interconnected between probe, opens the air valve 340 on plate reading 30, make probe 20 of the supply module 350 to the top
Tracheae 221 in be inflated, you can realizing makes the air bag 210 in all probes 20 be bullied expansion, so as to be attached to inclinometer pipe
On 10 inner wall；In addition the probe 20 of the top is connected with plate reading 30, and the data that the probe 20 of lower section measures pass through top
Probe 20 transfers successively, finally passes to plate reading 30 by the probe 20 of the top, and plate reading 30 can obtain all probes 20
Measurement data, and the measurement data of acquisition is uploaded to control centre 40.
S4：The control centre 40 monitors the tilt data situation of change of each position of inclinometer pipe, when inclining for some position
When oblique data exceed default early warning value, alarm is carried out；The deformation of each position is calculated according to tilt data variation simultaneously
Data simultaneously draw deformation curve.Wherein, early warning value by control centre 40 by being manually configured, and works as inclinometer pipe 10 equipped with more
During root, each inclinometer pipe 10 can be directed to and set an early warning value.
S5：The foundation pit enclosure structure high-precision detection system is removed after the completion of foundation pit construction.Specifically, pass through tracheae
Gas releasing can shrink air bag 210 by 221, so as to being separated with the inner wall of inclinometer pipe 10, afterwards by probe group from inclinometer pipe
Extraction, simple and convenient in 10.
In conclusion foundation pit enclosure structure high-precision detection system provided by the invention and detection method, compared to existing skill
Art, there are following advantages：
(1) by the way that multiple probes 20 are in turn connected to form probe group, each probe 20 corresponds to the difference in inclinometer pipe 10
Position can once measure the inclination conditions of multiple positions, substantially increase measurement efficiency, pass through plate reading 30 and control in addition
Center 40 is monitored in real time, it can be achieved that being monitored in real time when 24 is small；
(2) once mounting high-precision detection system can use in entire construction period, be inflated by air bag 210
Probe 20 is made effectively to be attached on 10 inner wall of inclinometer pipe, it is not only easy to operate, and without manually lifting, when avoiding artificial lifting
The problem of there are error so as to which precision be caused to be difficult to control；
(3) using air inflated structure, structure is simpler, and it is more convenient that manufacture is safeguarded.
Although embodiments of the present invention are illustrated in specification, these embodiments are intended only as prompting,
It should not limit protection scope of the present invention.It is equal that various omission, substitution, and alteration are carried out without departing from the spirit and scope of the present invention
It should include within the scope of the present invention.
Claims (10)
1. a kind of foundation pit enclosure structure high-precision detection system, which is characterized in that including inclinometer pipe, in the inclinometer pipe
Probe and the probe plate reading connected and the control centre being connected with the plate reading, are each arranged on the probe
There is air bag, be attached to after the airbag aeration expansion on the deviational survey inside pipe wall, multiple probes can be in turn connected to form spy
Head group, the probe group wherein probe of one end are connected with the plate reading.
2. foundation pit enclosure structure high-precision detection system according to claim 1, which is characterized in that the probe includes phase
Intercommunicated upper cavity and lower chamber, the deviational survey pcb board between the upper cavity and lower chamber inside, the air bag difference
It is sheathed on the upper cavity and lower chamber, the one end of the upper cavity away from the lower chamber is also connected with tracheae, the tracheae
One end away from the upper cavity is equipped with connector, and one side of the lower chamber away from the upper cavity is equipped with and the connector
The connecting tube of adaptation, the deviational survey pcb board are connected with plate reading.
3. foundation pit enclosure structure high-precision detection system according to claim 2, which is characterized in that the deviational survey pcb board
Including sequentially connected deviational survey circuit, cable and plug, the plug includes male plug and female, is divided into the deviational survey
The both sides up and down of circuit, the deviational survey circuit includes multiple Integration of electrical components, automatic to detect angle of inclination and export signal；Institute
Stating cable includes 2 power cords and 2 data lines, and the plug is quick connector.
4. foundation pit enclosure structure high-precision detection system according to claim 3, which is characterized in that the plate reading includes
It data collector, the data display equipment being connected with the data collector, power supply module, air valve and is connected with the air valve
Module is supplied, the data collector is connected with the data cable, and the power supply module is connected with the power cord, the supply
Module is connected with the tracheae.
5. foundation pit enclosure structure high-precision detection system according to claim 4, which is characterized in that control centre's bag
Data processing unit and alarm unit are included, the data processing unit is connected with the data collector.
6. foundation pit enclosure structure high-precision detection system according to claim 2, which is characterized in that set on the outside of the air bag
There is pressure ring, housing be respectively equipped on the outside of the upper cavity and corresponding air bag outside and the lower chamber and corresponding air bag,
It is connected through a screw thread respectively between the housing and the upper cavity and lower chamber.
7. foundation pit enclosure structure high-precision detection system according to claim 2, which is characterized in that the upper cavity is under
Locating ring is set between cavity, the locating ring is equipped with several bolts hole, and the bolt hole is built-in with connection bolt, described
The joint location of upper cavity and lower chamber is additionally provided with sealing ring.
8. foundation pit enclosure structure high-precision detection system according to claim 2, which is characterized in that the tracheae includes rubber
Sebific duct and seal washer, the rubber tube pass through seal washer and nut airtight connection with the upper cavity.
It is 9. a kind of such as the detection method of claim 1~8 any one of them foundation pit enclosure structure high-precision detection system, spy
Sign is, comprises the following steps：
S1：Pre-buried several inclinometer pipes when pouring the enclosure wall of foundation pit；
S2：According to the depth of enclosure wall, the quantity of required probe is calculated, and required probe is in turn connected into probe group；
S3：The probe group is placed in the inclinometer pipe and inflation makes probe group be attached on deviational survey inside pipe wall into air bag,
It is measured with the tilt data of the different position to inclinometer pipe, the plate reading obtains the inclination number of the different position of inclinometer pipe
According to, and it is uploaded to the control centre；
S4：The tilt data situation of change of each position of control centre's monitoring inclinometer pipe, when the tilt data of some position
During beyond default early warning value, alarm is carried out；The deformation data of each position is calculated simultaneously according to tilt data variation simultaneously
Draw deformation curve；
S5：The foundation pit enclosure structure high-precision detection system is removed after the completion of foundation pit construction.
10. detection method according to claim 9, which is characterized in that in the step S2, the connection between adjacent probes
Method is：The plug of deviational survey pcb board of two probes is mutually butted, and by the connection of the connecting tube of one of which and another one
Head is attached, and the measurement data of this two probes is transferred by the data cable in plug.
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Cited By (3)
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| CN108951727A (en) * | 2018-09-17 | 2018-12-07 | 长安大学 | A kind of automation deviational survey warning device and foundation pit tilt monitoring method |
| CN110616748A (en) * | 2019-09-04 | 2019-12-27 | 上海建工集团股份有限公司 | Unilateral underground enclosure structure deformation detection robot and detection method |
| CN112050712A (en) * | 2020-08-22 | 2020-12-08 | 深圳华力岩土工程有限公司 | Displacement measuring device for surveying |
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