CN110044328A - A kind of monitoring method for runway ground settlement - Google Patents

A kind of monitoring method for runway ground settlement Download PDF

Info

Publication number
CN110044328A
CN110044328A CN201910360631.7A CN201910360631A CN110044328A CN 110044328 A CN110044328 A CN 110044328A CN 201910360631 A CN201910360631 A CN 201910360631A CN 110044328 A CN110044328 A CN 110044328A
Authority
CN
China
Prior art keywords
monitoring
prism
runway
screw rod
center
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201910360631.7A
Other languages
Chinese (zh)
Inventor
张帅军
熊炎林
何伟
种玉配
杨效广
白中坤
屈永平
吕瑞虎
李文俊
胡昆昆
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China Railway Tunnel Group Co Ltd CRTG
CRTG Survey and Design Institute Co Ltd
Original Assignee
China Railway Tunnel Group Co Ltd CRTG
CRTG Survey and Design Institute Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China Railway Tunnel Group Co Ltd CRTG, CRTG Survey and Design Institute Co Ltd filed Critical China Railway Tunnel Group Co Ltd CRTG
Priority to CN201910360631.7A priority Critical patent/CN110044328A/en
Publication of CN110044328A publication Critical patent/CN110044328A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01CMEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C5/00Measuring height; Measuring distances transverse to line of sight; Levelling between separated points; Surveyors' levels

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Road Signs Or Road Markings (AREA)

Abstract

The invention discloses a kind of monitoring methods of runway ground settlement, this method comprises: obtaining monitoring holes Step 1: the setting position in runway is bored into projected depth;It will be inserted vertically into pea gravel concreten with screw flight reinforcing bar, and screw rod end is upward;Then fine sand is perfused in monitoring holes;Prism is vertically arranged to the end of screw rod by pedestal, and the mirror surface of prism is towards total station;By total station eyepiece elder generation alignment fiducials point reflection piece center, it is then directed at the center of reticule of prism again, total station calculates prism center of reticule elevation automatically;It measures again.The prism center of reticule elevation measured twice is subtracted each other.Using the method increase the monitoring efficiency of runway ground settlement, enters runway prison to be measured without personnel when monitoring, the influence of road traffic will be minimized, reduce the insecurity factor of survey crew.

Description

A kind of monitoring method for runway ground settlement
Technical field
The invention belongs to municipal works technical fields, and in particular to a kind of monitoring method for runway ground settlement.
Background technique
During municipal underground engineering construction, the case where being constructed below runway, is relatively common, in order to guarantee The safety of runway during underground engineering construction, it is necessary to sinking deformation monitoring be carried out to the runway earth's surface by construction infection, protected Demonstrate,prove the safety of road and driving vehicle.
The monitoring method of country's runway ground settlement is at present: first on the left side concrete road surface core drill diameter 150mm Then the right side, depth 50mm or so circular hole use small diameter drill bit instead and continue to bore 800mm or so hole, monitoring point be embedded in hole, bottom Fine sand is filled on concreting, top.When carrying out runway surface subsidence monitoring every time, need that indium steel ruler is manually placed on prison Above measuring point, then measured with level.This monitoring method can measure road caused by being influenced by Municipal Engineering Construction Face sedimentation, energy actual response go out influence of the Municipal Engineering Construction to surface subsidence.
Ground Point settlement monitoring is carried out using conventional level monitoring method, needs manually to stand indium steel ruler in monitoring point On, it also needs manually to buttress indium steel ruler always in monitoring process, when monitoring other measuring points, also needs manually to carry the shifting of indium steel ruler It moves to monitoring location to be measured and stands on indium steel ruler on monitoring point to be measured, such that helping the people of indium steel ruler in carriage way On working time it is longer, it is also necessary to move back and forth between monitoring point to be measured, the safety of vehicle and monitoring personnel can not obtain It to guarantee, is affected to traffic, while increasing time of measuring, working efficiency is lower.
Summary of the invention
Technical problem to be solved by the present invention lies in view of the above shortcomings of the prior art, provide a kind of runway earth's surface The monitoring method of sedimentation, improves the monitoring efficiency of runway ground settlement, enters runway prison to be measured without personnel when monitoring, The influence of road traffic will be minimized, reduces the insecurity factor of survey crew.
In order to solve the above technical problems, the technical solution adopted by the present invention is that, a kind of monitoring side of runway ground settlement Method, the monitoring method include the following steps:
Step 1: the setting position in runway is bored into projected depth, monitoring holes are obtained;Microlith is perfused in monitoring holes bottom Concrete, until 1/4-1/3 place of monitoring hole depth;In the outside of runway, total station is set;
It will be inserted vertically into pea gravel concreten with screw flight reinforcing bar, and screw rod end is upward, screw rod end is located at monitoring In hole, and distance of the upper end apart from monitoring holes aperture is 3-4cm;
Step 2: fine sand is then perfused in monitoring holes, until arriving the distance apart from screw rod lower end is 4-5cm;
Step 3: prism to be vertically arranged to the end of screw rod by pedestal, and the mirror surface of prism is towards total station;
Step 4: detachably installing protection cap in the top of monitoring holes, protection cover covers monitoring holes, wherein monitoring The top of the close total station side in hole is open-like shape;
Protection cap be one middle part raise upward, two sides have the oblique wing shell, and the width of shell be less than monitoring holes it is straight Diameter;
Step 5: being then aligned again in the crosshair of prism by total station eyepiece elder generation alignment fiducials point reflection piece center The heart, total station calculate prism center of reticule elevation automatically;
Step 6: repeating step 5 when measuring again, measuring prism center of reticule elevation at this time;
Step 7: subtracting each other the prism center of reticule elevation measured in step 5 and step 6 to get at monitoring point Ground settlement value.
Further, in step 3, prism center of reticule is higher by monitoring holes aperture 2-3cm.
Further, the pedestal in the step 3 includes base body, is the rectangular cavity body of an open topped;
Connector is set to the bottom of base body straight down, has internal screw thread and open-ended hollow posts for one Shape body;For being connect with screw rod;
Mounting hole, it is longitudinally through to be provided on wherein at least one group of opposite shell of cavity body;
Screw is installed in corresponding mounting hole, and front end is pierced by mounting hole, for resisting clamping prism.
Further, which is vertically arranged at the intracorporal center of cavity.
Further, the diameter of the spiral is 18mm, and the length of screw rod is 5cm.
Further, a kind of design disposably to be drilled using 80mm core drill in runway setting position of the step is deep Degree.
The invention also discloses a kind of monitoring devices for runway ground settlement, genuine for a kind of above-mentioned driving In the monitoring method of table sedimentation, comprising:
Spiral is a column;
Screw rod, for externally threaded round bar, one end integrally connected of one end and spiral;
Pedestal is the rectangular cavity body of an open topped, the end connection of bottom and screw rod;
Prism, is vertically arranged at the center in the base cavity pocket, and the shape of cross section is that quadrangle is the rectangular of fillet Shape, and fillet is located at short side;Two sides where long side are mirrored sides.
Further, further includes:
Connector is set to the bottom of the pedestal straight down, has internal screw thread and open-ended hollow posts for one Shape body, connect with screw rod;
Mounting hole, it is longitudinally through to be provided on wherein at least one group of opposite shell of cavity body;
Screw is installed in the corresponding mounting hole, and front end is pierced by mounting hole, for resisting clamping prism.
A kind of monitoring method of runway ground settlement of the present invention, which has the advantages that, only needs a people in 1 measurement process Home operates total station other than runway, does not need other staff and operates at runway earth's surface monitoring point, mentions The safety of high monitoring personnel.
2. measurement process middle rolling car does not have monitoring personnel on road, does not need to carry out temporary enclosed to traffic, will not influence friendship It is logical.
3. in measurement process, the personnel that do not need carry indium steel ruler and move back and forth between monitoring point to be measured, indium steel ruler is found, is looked for It is flat, the time can be saved, working efficiency is improved.
4. prism base, prism and protection cap may be reused, monitoring cost is reduced.
5. method simple possible of the invention, practicability is stronger, works well.
Detailed description of the invention
Fig. 1 is the monitoring arrangement schematic diagram in the present invention.
Fig. 2 is the structural schematic diagram of spiral.
Fig. 3 is pedestal and spiral connection schematic diagram.
Fig. 4 is the structural schematic diagram of pedestal.
Fig. 5 is pedestal and the fixed schematic diagram of prism.
Fig. 6 is protection cap structural schematic diagram.
Fig. 7 is protection cap and monitoring holes position view.
Wherein: 1. pea gravel concretens, 2. screw rods, 3. spirals, 4. fine sands, 5. pedestals, 6. shells, 7. screws, 8. ribs Mirror, 9. protection caps, 10. rubber, 11. steel plates, 14. monitoring holes, 15. total stations.
Specific embodiment
A kind of monitoring method of runway ground settlement of the present invention, the monitoring method include the following steps: such as Fig. 1 and 2 institute Show:
Step 1: the setting position in runway is bored into projected depth, monitoring holes 14 are obtained;It is perfused in 14 bottom of monitoring holes Pea gravel concreten 1, until 1/4-1/3 place of 14 depth of monitoring holes;In the outside of runway, total station 15 is set;
Spiral 3 with screw rod 2 is inserted vertically into pea gravel concreten 1, and screw rod end is upward, screw rod end is located at prison In gaging hole 14, and distance of the upper end apart from monitoring holes aperture is 3-4cm;
Step 2: fine sand then is perfused in monitoring holes 14, until arriving the distance apart from 2 lower end of screw rod is 4-5cm;
Step 3: prism 8 is vertically arranged at the end of screw rod by pedestal 5, and the mirror surface of prism 8 is towards total station 15;The center of reticule of prism is higher by 14 aperture 2-3cm of monitoring holes.Prism 8 is vertically arranged at the intracorporal center of cavity.
As in Figure 3-5, the pedestal 5 in step 3 includes base body, is the rectangular cavity body of an open topped;
Connector is set to the bottom of base body straight down, has internal screw thread and open-ended hollow posts for one Shape body;For being connect with screw rod 2;
Mounting hole, on longitudinally through wherein at least one group opposite shell 6 for being provided with cavity body;
Screw 7 is installed in corresponding mounting hole, and front end is pierced by mounting hole, for resisting clamping prism.
Step 4: detachably installing protection cap 9 in the top of monitoring holes 14,9 part of protection cap covers monitoring holes 14, In, the top of 15 side of close total station of monitoring holes 14 is open-like shape;
As shown in fig. 6, above-mentioned protection cap 9 raises upward for a middle part, shell of the two sides with the oblique wing, and the width of shell Less than the diameter of monitoring holes 14;When installing the protection cap 9, the lower section of protection cap 9 be additionally provided with one it is complete with its shape Consistent steel plate 11 covers a rubber slab 10 consistent with its shape in the top of protection cap 9, in the lower section of steel plate 11, and Two sides positioned at the monitoring holes 14 are also provided with rubber slab 10, to play the role of buffering.
Step 5: being then directed at the crosshair of prism 8 again by 15 eyepiece elder generation alignment fiducials point reflection piece center of total station Center, total station 15 calculate prism center of reticule elevation automatically;Datum mark: it is selected in same in runway with total station 15 Side, the opposite stability region outside construction infection range, earth's surface elevation do not change.As shown in Figure 7.
Step 6: repeating step 5 when measuring again, measuring prism center of reticule elevation at this time;
Step 7: subtracting each other the prism center of reticule elevation measured in step 5 and step 6 to get at monitoring point Ground settlement value.
The invention also discloses a kind of monitoring devices for runway ground settlement, genuine for a kind of above-mentioned driving In the monitoring method of table sedimentation, comprising: spiral 3 is a column;
Screw rod 2, for externally threaded round bar, one end integrally connected of one end and spiral 3;
Pedestal is the rectangular cavity body of an open topped, and bottom is connect with the end of screw rod 2;
Prism 8 is vertically arranged at the center in base cavity pocket, and the shape of cross section is the rectangle that quadrangle is fillet, And fillet is located at short side;Two sides where long side are mirrored sides.
Further include: connector is set to the bottom of the pedestal straight down, for one with internal screw thread and open-ended Hollow column, connect with the screw rod 2;
Mounting hole, on longitudinally through wherein at least one group opposite shell 6 for being provided with the cavity body;
Screw 7 is installed in the corresponding mounting hole, and front end is pierced by mounting hole, clamps the prism for resisting 8。
Specific construction process are as follows: the projected depth disposably to be drilled using 80mm core drill in runway setting position, Pea gravel concreten 1 is perfused in monitoring holes bottom, processes a diameter 18mm, the spiral 3 for the screw rod 2 that one end is length 5cm, inserts Enter 50mm in pea gravel concreten, then starts to fill fine sand.When fine sand is perfused to apart from screw rod lower side 4-5cm, stop perfusion Fine sand.In 2 end mounting seat 5 of screw rod, then the prism 8 being vertically arranged is installed in the center of pedestal 5, screw 7 is longitudinal The mounting hole opened up on shell 6, front end are pierced by mounting hole, resist and clamp prism 5.The center of reticule of prism is higher by monitoring 14 aperture 2-3cm of hole.Pedestal 5 includes base body, is the rectangular cavity body of an open topped;As shown in figure 4, A, B, C and D Represented size is respectively that A is 4cm, and B 6cm, C 5cm, D 3cm, E 3cm, F 6cm, 6 be fixing clip, and 7 be spiral shell Silk, for fastening prism.
Then it by 15 eyepiece elder generation alignment fiducials point reflection piece center of total station, is then aligned again in the crosshair of prism 8 The heart, total station 15 calculate prism center of reticule elevation automatically;, when measuring again, repeat above operation, measure rib at this time Mirror center of reticule elevation;The prism center of reticule elevation measured twice is subtracted each other to get the ground settlement at monitoring point Value.
Method practicability in the present invention is stronger, and people home other than runway is only needed to operate in measurement process Total station does not need other staff and operates at runway earth's surface monitoring point, improves the safety of monitoring personnel, measured Journey middle rolling car does not have monitoring personnel on road, does not need to carry out temporary enclosed to traffic, will not influence traffic, does not need personnel's carrying Indium steel ruler moves back and forth between monitoring point to be measured, founds indium steel ruler, levelling, can save the time, improve working efficiency.Prism bottom Seat, prism and protection cap may be reused, and reduce monitoring cost.

Claims (8)

1. a kind of monitoring method of runway ground settlement, which is characterized in that the monitoring method includes the following steps:
Step 1: the setting position in runway is bored into projected depth, monitoring holes (14) are obtained;In the monitoring holes (14) bottom It is perfused pea gravel concreten (1), until 1/4-1/3 place of the monitoring holes (14) depth;In the outside of runway, total station is set (15);
Spiral (3) with screw rod (2) is inserted vertically into pea gravel concreten (1), and screw rod end is upward, the screw rod end In monitoring holes (14), and distance of the upper end apart from monitoring holes aperture is 3-4cm;
Step 2: fine sand is then perfused in the monitoring holes (14), until arriving the distance apart from screw rod (2) lower end is 4-5cm;
Step 3: prism (8) to be vertically arranged to the end of the screw rod by pedestal (5), and the mirror surface court of the prism (8) To the total station (15);
Step 4: detachably being installed protection cap (9) in the top of the monitoring holes (14), protection cap (9) the part covering institute State monitoring holes (14), wherein the top close to the total station (15) side of the monitoring holes (14) is open-like shape;
The protection cap (9) be one middle part raise upward, two sides have the oblique wing shell, and the width of shell be less than the monitoring The diameter in hole (14);
Step 5: being then directed at the prism (8) again by the total station (15) eyepiece elder generation alignment fiducials point reflection piece center Center of reticule, the total station (15) calculates prism center of reticule elevation automatically;
Step 6: repeating step 5 when measuring again, measuring prism center of reticule elevation at this time;
Step 7: subtracting each other the prism center of reticule elevation measured in the step 5 and step 6 to get at monitoring point Ground settlement value.
2. a kind of monitoring method of runway ground settlement according to claim 1, which is characterized in that in step 3, Prism center of reticule is higher by monitoring holes aperture 2-3cm.
3. a kind of monitoring method of runway ground settlement according to claim 2, which is characterized in that in the step 3 Pedestal (5) include base body, be an open topped rectangular cavity body;
Connector is set to the bottom of the base body straight down, has internal screw thread and open-ended hollow posts for one Shape body;For being connect with the screw rod (2);
Mounting hole, it is longitudinally through to be provided on wherein at least one group of opposite shell (6) of the cavity body;
Screw (7) is installed in the corresponding mounting hole, and front end is pierced by mounting hole, clamps the prism for resisting.
4. a kind of monitoring method of runway ground settlement according to claim 3, which is characterized in that the prism (8) It is vertically arranged at the intracorporal center of the cavity.
5. a kind of monitoring method of runway ground settlement according to claim 1,2,3 or 4, which is characterized in that described The diameter of spiral (3) is 18mm, and the length of the screw rod (2) is 5cm.
6. a kind of monitoring method of runway ground settlement according to claim 5, which is characterized in that the step is a kind of The projected depth disposably to be drilled using 80mm core drill in runway setting position.
7. a kind of monitoring device for runway ground settlement is used for a kind of driving of any of claims 1-6 In the monitoring method of road ground settlement characterized by comprising
Spiral (3) is a column;
Screw rod (2), for externally threaded round bar, one end integrally connected of one end and the spiral (3);
Pedestal is the rectangular cavity body of an open topped, and bottom is connect with the end of the screw rod (2);
Prism (8), is vertically arranged at the center in the base cavity pocket, and the shape of cross section is that quadrangle is the rectangular of fillet Shape, and fillet is located at short side;Two sides where long side are mirrored sides.
8. a kind of monitoring device for runway ground settlement according to claim 7, which is characterized in that further include:
Connector is set to the bottom of the pedestal straight down, has internal screw thread and open-ended hollow columnar for one Body is connect with the screw rod (2);
Mounting hole, it is longitudinally through to be provided on wherein at least one group of opposite shell (6) of the cavity body;
Screw (7) is installed in the corresponding mounting hole, and front end is pierced by mounting hole, clamps the prism for resisting (8)。
CN201910360631.7A 2019-04-30 2019-04-30 A kind of monitoring method for runway ground settlement Pending CN110044328A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910360631.7A CN110044328A (en) 2019-04-30 2019-04-30 A kind of monitoring method for runway ground settlement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910360631.7A CN110044328A (en) 2019-04-30 2019-04-30 A kind of monitoring method for runway ground settlement

Publications (1)

Publication Number Publication Date
CN110044328A true CN110044328A (en) 2019-07-23

Family

ID=67280546

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910360631.7A Pending CN110044328A (en) 2019-04-30 2019-04-30 A kind of monitoring method for runway ground settlement

Country Status (1)

Country Link
CN (1) CN110044328A (en)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102252655A (en) * 2011-04-29 2011-11-23 西南交通大学 Device for precisely measuring target height
CN103090812A (en) * 2013-01-10 2013-05-08 北京帝测科技发展有限公司 System and method for tunnel deformation monitoring
CN203323736U (en) * 2013-05-27 2013-12-04 山西华晋岩土工程勘察有限公司 Novel deformation monitoring device
CN205156911U (en) * 2015-11-27 2016-04-13 武汉钢铁(集团)公司 Overhead traveling crane track center and for level measurement prism holder
CN206019656U (en) * 2016-08-31 2017-03-15 广州供电局有限公司 For monitoring the mark instrument in tunnel
CN106767520A (en) * 2017-03-13 2017-05-31 中交第四公路工程局有限公司 A kind of main rope of suspension bridge linear measurement instrument
CN106949877A (en) * 2017-02-20 2017-07-14 南京理工大学 The monitoring method of ground settlement above a kind of various dimensions shield tunnel
CN206638183U (en) * 2017-01-24 2017-11-14 中铁第四勘察设计院集团有限公司 A kind of prism centralising device for being easy to high-speed railway rail deformation monitoring
CN207923110U (en) * 2018-01-26 2018-09-28 上海建工五建集团有限公司 A kind of orbit monitoring dedicated unit
CN109631837A (en) * 2019-01-21 2019-04-16 中铁隧道勘察设计研究院有限公司 A kind of method for embedding for subway work surface subsidence monitoring point

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102252655A (en) * 2011-04-29 2011-11-23 西南交通大学 Device for precisely measuring target height
CN103090812A (en) * 2013-01-10 2013-05-08 北京帝测科技发展有限公司 System and method for tunnel deformation monitoring
CN203323736U (en) * 2013-05-27 2013-12-04 山西华晋岩土工程勘察有限公司 Novel deformation monitoring device
CN205156911U (en) * 2015-11-27 2016-04-13 武汉钢铁(集团)公司 Overhead traveling crane track center and for level measurement prism holder
CN206019656U (en) * 2016-08-31 2017-03-15 广州供电局有限公司 For monitoring the mark instrument in tunnel
CN206638183U (en) * 2017-01-24 2017-11-14 中铁第四勘察设计院集团有限公司 A kind of prism centralising device for being easy to high-speed railway rail deformation monitoring
CN106949877A (en) * 2017-02-20 2017-07-14 南京理工大学 The monitoring method of ground settlement above a kind of various dimensions shield tunnel
CN106767520A (en) * 2017-03-13 2017-05-31 中交第四公路工程局有限公司 A kind of main rope of suspension bridge linear measurement instrument
CN207923110U (en) * 2018-01-26 2018-09-28 上海建工五建集团有限公司 A kind of orbit monitoring dedicated unit
CN109631837A (en) * 2019-01-21 2019-04-16 中铁隧道勘察设计研究院有限公司 A kind of method for embedding for subway work surface subsidence monitoring point

Similar Documents

Publication Publication Date Title
CN113802424B (en) Sedimentation bag type grouting lifting repair method for ballastless track of high-speed railway
CN109631837A (en) A kind of method for embedding for subway work surface subsidence monitoring point
CN208533586U (en) A kind of five layers of inverse method one-column one-pile one thousandth vertical adjustment precision plumbing device in underground
CN106245529A (en) Railway tee girder falls beam method safely and fast
CN110044328A (en) A kind of monitoring method for runway ground settlement
CN204142243U (en) Pre-embedded steel slab relative relief measures servicing unit
CN204163120U (en) Excavation of foundation pit space enclosing structure top deformation monitoring device
CN207412593U (en) A kind of height-adjustable Method of Military Training Result jumping stand
CN217442478U (en) Device for positioning head position of push bench
CN214832858U (en) Anchor bolt fixer
CN211038510U (en) Side slope contour blasting blast hole drilling guide frame
CN106522253B (en) Drill precise holes and the construction method of grouting on a kind of big depth of water toe board
CN212058728U (en) Highway bridge subsides detection device
CN210177987U (en) Shock insulation support installation locating rack
CN203893846U (en) Pier stud perpendicularity measuring instrument
CN203023751U (en) Multifunctional forced centering foot stool
CN204715430U (en) For the forced centering foot rest that the optional centering CPIII in railway bed location measures
CN205530263U (en) A locator for construction of steel pipe retaining pile
CN215849012U (en) A auxiliary positioning device that punches for building engineering
CN112376600A (en) Safe anti-seismic building pile
CN105696596A (en) Positioner for steel pipe guard post construction and construction method of steel pipe guard post
CN108223913A (en) Pipe installing checks auxiliary tool with backfill
CN205188965U (en) A guide bracket for side slope treatment equipment
CN211373484U (en) Measuring scale for detecting deformation of highway bridge bearing
CN214169184U (en) Foundation pit deformation monitoring device

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication

Application publication date: 20190723

RJ01 Rejection of invention patent application after publication