CN114136246A - Foundation pit deformation monitoring device and method - Google Patents
Foundation pit deformation monitoring device and method Download PDFInfo
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- CN114136246A CN114136246A CN202111434957.3A CN202111434957A CN114136246A CN 114136246 A CN114136246 A CN 114136246A CN 202111434957 A CN202111434957 A CN 202111434957A CN 114136246 A CN114136246 A CN 114136246A
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- 238000012806 monitoring device Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 101
- 238000012544 monitoring process Methods 0.000 claims abstract description 98
- 238000002347 injection Methods 0.000 claims abstract description 88
- 239000007924 injection Substances 0.000 claims abstract description 88
- 239000007788 liquid Substances 0.000 claims abstract description 44
- 238000006073 displacement reaction Methods 0.000 claims description 19
- 229920003023 plastic Polymers 0.000 claims description 8
- 229920001296 polysiloxane Polymers 0.000 claims description 4
- 239000011521 glass Substances 0.000 claims description 3
- 230000003044 adaptive effect Effects 0.000 claims description 2
- 230000005611 electricity Effects 0.000 claims description 2
- 239000002689 soil Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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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
- G01B13/00—Measuring arrangements characterised by the use of fluids
- G01B13/24—Measuring arrangements characterised by the use of fluids for measuring the deformation in a solid
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C5/00—Measuring height; Measuring distances transverse to line of sight; Levelling between separated points; Surveyors' levels
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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
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/02—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by gauge glasses or other apparatus involving a window or transparent tube for directly observing the level to be measured or the level of a liquid column in free communication with the main body of the liquid
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Abstract
The invention discloses a foundation pit deformation monitoring device and a foundation pit deformation monitoring method, relates to the technical field of foundation pit engineering, and solves the problems of high cost and large error of the conventional foundation pit monitoring device. The technical scheme adopted by the invention is as follows: foundation pit deformation monitoring devices, including being used for along the horizontal water injection pipe that foundation pit periphery laid, horizontal water injection pipe end to end links and forms sealed annular, and vertical pipe is connected respectively in each position that corresponds to foundation pit deformation monitoring point to horizontal water injection pipe, and vertical pipe and horizontal water injection pipe intercommunication, vertical pipe are equipped with the liquid level scale, vertical pipe vertical arrangement and upper end and external intercommunication. The foundation pit deformation monitoring method comprises the steps of monitoring the deformation of a foundation pit through a foundation pit deformation monitoring device, completely injecting water into a horizontal water injection pipe, enabling a foundation pit deformation monitoring point to rise or subside, enabling a vertical pipe in a corresponding position to rise or fall, enabling the actual liquid level of the vertical pipe to correspondingly change relative to the liquid level scale of the vertical pipe, and accurately obtaining the rise and subsidence change of the foundation pit deformation monitoring point through the change.
Description
Technical Field
The invention relates to the technical field of foundation pit engineering, in particular to a device and a method for monitoring foundation pit deformation.
Background
At present, equipment such as a total station, a level gauge, a tower staff, an inclinometer and the like is widely used for monitoring the deformation of a foundation pit. The sliding staff needs to be manually erected at each measuring point for observation, and the measurement error is large due to inaccurate manual erecting. In addition, the measured data of each measuring point is relative to the reference point, and when each measuring point is compared, conversion needs to be performed through the reference point, so that the processing process is complicated.
Disclosure of Invention
The invention firstly provides a foundation pit deformation monitoring device, and solves the problems of high cost and large error of the conventional foundation pit monitoring device.
The technical scheme adopted by the invention is as follows: foundation pit deformation monitoring devices, including being used for along the horizontal water injection pipe that foundation pit periphery laid, horizontal water injection pipe end to end links and forms sealed annular, and vertical pipe is connected respectively in each position that corresponds to foundation pit deformation monitoring point to horizontal water injection pipe, and vertical pipe and horizontal water injection pipe intercommunication, vertical pipe are equipped with the liquid level scale, vertical pipe vertical arrangement and upper end and external intercommunication.
Further, the method comprises the following steps: the foundation pit deformation monitoring device further comprises an inclinometer and/or a liquid level sensor, wherein the inclinometer is used for monitoring the inclination of the vertical pipe, and the liquid level sensor is used for monitoring the liquid level of the vertical pipe relative to the liquid level of the vertical pipe. Wherein, the inclinometer is preferably arranged in the vertical pipe, and the liquid level sensor is preferably in a non-contact type and is arranged at the outer side of the horizontal water injection pipe.
Further, the method comprises the following steps: the horizontal water injection pipes between two adjacent vertical pipes are arranged straightly, and the pipe sections of the horizontal water injection pipes connected with the vertical pipes are provided with length scales; the foundation pit deformation monitoring device further comprises a displacement sensor for monitoring the stretching length of the horizontal water injection pipe, and the displacement sensor is arranged on the two sides of the connecting point of the horizontal water injection pipe and the vertical pipe respectively.
Specifically, the method comprises the following steps: every vertical pipe all is equipped with the alarm, and displacement sensor, inclinometer and level sensor all are connected with the alarm electricity that corresponds.
Specifically, the method comprises the following steps: the horizontal water injection pipe is a plastic silicone pipe, and the vertical pipe is a transparent glass pipe or a plastic pipe.
The invention has the beneficial effects that: and completely injecting water into a horizontal water injection pipe of the foundation pit deformation monitoring device, and maintaining each vertical pipe at a certain liquid level. The foundation pit deformation monitoring point rises or subsides, and the vertical pipe that corresponds the position rises or descends, and the corresponding change of the liquid level scale of the relative vertical pipe of the actual liquid level of vertical pipe can accurately obtain the uplift and the settlement change condition of foundation pit deformation monitoring point through this change. The foundation pit deformation monitoring device is simple in structure, low in cost, convenient to adjust, accurate in data, labor-saving in use and capable of being recycled and used repeatedly.
The foundation pit deformation monitoring device comprises an inclinometer, and the condition that the foundation pit deformation monitoring points at the corresponding positions are not uniformly settled or raised can be obtained by directly measuring the inclination condition of the vertical pipes. The pipe section that vertical pipe is connected to horizontal water injection pipe sets up the length scale, is convenient for estimate the deformation condition between two adjacent foundation ditch deformation monitoring points through the tensile change of horizontal water injection pipe.
The invention also provides a foundation pit deformation monitoring method, which solves the problems of high cost and large error of the existing foundation pit monitoring method, and adopts the technical scheme that: the foundation pit deformation monitoring method for monitoring the deformation of the foundation pit through the foundation pit deformation monitoring device comprises the following steps:
s1, laying the horizontal water injection pipes along the periphery of the foundation pit, connecting the horizontal water injection pipes with the vertical pipes at the positions corresponding to the foundation pit deformation monitoring points respectively, and vertically installing the vertical pipes at the foundation pit deformation monitoring points primarily.
And S2, injecting water into the horizontal water injection pipes to enable the horizontal water injection pipes to be filled with water, and enabling each vertical pipe to be filled with water.
Further, the method comprises the following steps: the vertical pipe corresponding to the lowest foundation pit deformation monitoring point is used as a water injection port, the vertical pipe corresponding to the highest foundation pit deformation monitoring point is used as an air exhaust port, the tops of the vertical pipes corresponding to the other foundation pit deformation monitoring points are temporarily sealed, and water injection is performed.
S3, vertically and fixedly installing each vertical pipe at a foundation pit deformation monitoring point, and communicating the upper ends of the vertical pipes with the outside. For example, a support is erected at a foundation pit deformation monitoring point, a vertical pipe is vertically installed on the support, and the upper end of the vertical pipe is open and is provided with an adaptive pipe plug.
S4, carrying out foundation pit deformation monitoring: the liquid level scale change corresponding to the actual liquid level of the vertical pipe is used as the settlement change of the corresponding foundation pit deformation monitoring point, the inclination change of the vertical pipe is used as the uneven deformation of the corresponding foundation pit deformation monitoring point, and the tensile change of the horizontal water injection pipe between the two adjacent foundation pit deformation monitoring points is used as the deformation between the two corresponding foundation pit deformation monitoring points.
Further, the method comprises the following steps: in the step S1, the horizontal water injection pipes are provided with reserved sections at the positions close to the vertical pipes, and the horizontal water injection pipes between the reserved sections are arranged straightly; in step S4, the horizontal displacement change of the two ends of the horizontal water injection pipe that are arranged straight relative to the foundation pit deformation monitoring points is used as the deformation between the two corresponding foundation pit deformation monitoring points.
The method for monitoring the deformation of the foundation pit has the beneficial effects that: the foundation pit deformation monitoring method is convenient to implement, low in difficulty and safe and reliable to use, the actual liquid level of the vertical pipe reflects the settlement change of the corresponding foundation pit deformation monitoring point, observation is convenient, the precision is high, and the uneven settlement change of the foundation pit deformation monitoring point and the horizontal displacement change of the two foundation pit deformation monitoring points can be monitored. The foundation pit deformation monitoring method can test the deformation of a single foundation pit and monitor the deformation of adjacent foundation pits, can overcome the defects that the traditional deformation monitoring work is complicated in process, high in labor cost, inaccurate in manual vertical dimension and capable of comparing data only through conversion processing, and can also overcome the defects that the traditional foundation pit monitoring device is high in manufacturing cost and high in maintenance cost.
Drawings
Fig. 1 is a schematic structural diagram of a foundation pit deformation monitoring device of the invention at a single foundation pit deformation monitoring point.
Reference numerals: horizontal water injection pipe 1, vertical pipe 2, inclinometer 3, level sensor 4, displacement sensor 5, alarm 6, support 7.
Detailed Description
The invention will be further explained with reference to the drawings.
Referring to fig. 1, the foundation pit deformation monitoring device of the invention comprises horizontal water injection pipes 1 which are laid along the periphery of the foundation pit, wherein the horizontal water injection pipes 1 are connected end to end and form a sealed ring. The horizontal injection pipes 1 are intended to be laid along the periphery of the foundation pit and can thus be connected end to end and form a sealed ring. The horizontal water injection pipe 1 can be a whole, and can also be divided into a multi-section structure, and the multi-section structure can be connected in series end to form a sealed ring. The horizontal water injection pipe 1 is respectively connected with the vertical pipe 2 at each position corresponding to the foundation pit deformation monitoring point, and the vertical pipe 2 is mutually communicated with the horizontal water injection pipe 1. For example, the horizontal water injection pipes 1 are connected with the vertical pipes 2 at equal intervals or unequal intervals, and the intervals are 20-30 m. The horizontal water injection pipe 1 and the vertical pipe 2 can be integrated or detachably connected. For example, the horizontal water injection pipes 1 are provided with screw joints at equal intervals, and one end of the vertical pipe 2 is threaded and connected at the screw joint of the horizontal water injection pipe 1. The vertical pipes 2 may or may not be equal in length, but preferably have the same pipe diameter and the smallest pipe diameter.
Horizontal water injection pipe 1 and vertical pipe 2 need be watered when using, and for the convenience of observing the intraductal water yield, horizontal water injection pipe 1 and vertical pipe 2 all are the transparent material best. For example, the horizontal water injection pipe 1 is a plastic silicone pipe, and the plastic silicone pipe is a pipe with silica gel coated on the outer side of the plastic pipe; the vertical tube 2 is a transparent glass tube or a plastic tube. The vertical pipe 2 is provided with liquid level scales so as to observe the liquid level scales corresponding to the actual liquid level. The vertical pipe 2 is vertically placed when in use, and in order to enable the liquid level in the vertical pipe 2 to correspondingly freely change along with the height change of the vertical pipe 2, the upper end of the vertical pipe 2 is communicated with the outside so as to balance the air pressure in the vertical pipe 2. The upper end of the vertical tube 2 is preferably open and provided with a sealing cap or plug which opens or closes the vertical tube 2.
Vertical pipe 2 is installed in foundation ditch deformation monitoring point, and foundation ditch deformation monitoring point uplift or subside corresponds vertical pipe 2 of position and rises or descends, and the height above sea level of the actual liquid level of vertical pipe 2 is relatively fixed, but the corresponding change of the liquid level scale of the relative vertical pipe 2 of the actual liquid level of vertical pipe 2, through this change can accurately obtain the uplift and the settlement change of foundation ditch deformation monitoring point. The liquid level scale that the actual liquid level of vertical pipe 2 corresponds can artifical direct observation, perhaps foundation ditch deformation monitoring devices still includes level sensor 4, and level sensor 4 is used for monitoring the liquid level of the liquid level height of vertical pipe 2 for vertical pipe 2. The level sensor 4 is preferably installed outside the horizontal water injection pipe 1 in a non-contact manner. When foundation pit deformation monitoring devices used, water was injected completely in the horizontal water injection pipe 1 to maintain certain liquid level height in each vertical pipe 2, level sensor 4 installed in the actual liquid level department of horizontal water injection pipe 1 best.
Uneven settlement or uplift exists at the foundation pit deformation monitoring point, and the vertical pipe 2 can incline. The foundation pit deformation monitoring device can also include inclinometer 3, and inclinometer 3 is used for monitoring 2 gradients of vertical pipe, for example, chooses current inclinometer 3 for use, and inclinometer 3 is installed in the inside of vertical pipe 2. The inclinometer 3 measures the inclination of the vertical pipe 2 and can also be used to correct the liquid level data of the vertical pipe 2. The regional settlement that probably exists between the monitoring point that warp, uplift or horizontal displacement change, 1 straight arrangements of horizontal water injection pipe between two adjacent vertical pipes 2, change appears in the region between the monitoring point that warp, and tensile change will appear in horizontal water injection pipe 1, for the ease of observing this tensile change, the pipeline section that vertical pipe 2 was connected to horizontal water injection pipe 1 sets up the length scale, perhaps the whole pipeline section of horizontal water injection pipe 1 all sets up the length scale. In order to facilitate observation of the tensile change of the horizontal water injection pipe 1, the foundation pit deformation monitoring device further comprises a displacement sensor 5 for monitoring the tensile length of the horizontal water injection pipe 1, and the displacement sensors 5 are respectively arranged on two sides of the connecting point of the horizontal water injection pipe 1 on the vertical pipe 2.
In order to facilitate the timely discovery of abnormal phenomena, each vertical pipe 2 is provided with an alarm 6, and the alarm 6 is preferably an audible and visual alarm. The displacement sensor 5, the inclinometer 3 and the liquid level sensor 4 are electrically connected with the corresponding alarm 6, and when any monitoring numerical value of the displacement sensor 5, the inclinometer 3 and the liquid level sensor 4 is larger than a set value, the alarm 6 gives an alarm so as to find and dispose in time.
The second subject of the invention is: the foundation pit deformation monitoring method for monitoring the deformation of the foundation pit through the foundation pit deformation monitoring device comprises the following steps:
s1, laying the horizontal water injection pipe 1 along the periphery of the foundation pit, connecting the horizontal water injection pipe 1 with the vertical pipe 2 at each position corresponding to the foundation pit deformation monitoring point, and vertically installing the vertical pipe 2 at the foundation pit deformation monitoring point primarily.
Horizontal water injection pipe 1 is laid along the foundation ditch periphery, can follow foundation ditch guan liang or side slope top soil body and bury underground, also can directly dig the slot at side slope top soil body, directly again lays horizontal water injection pipe 1 in the slot, and horizontal water injection pipe 1 is arranged according to foundation ditch place difference in height as far as possible horizontally. The foundation pit deformation monitoring point can excavate a mounting hole for install vertical pipe 2, vertical pipe 2 can be fixed through support 7, makes the preliminary vertical installation of vertical pipe 2. The vertical pipe 2 may be pre-closed to avoid soil ingress, for example the upper end of the vertical pipe 2 is open and fitted with an adapted plug.
And S2, injecting water into the horizontal water injection pipe 1 to enable the horizontal water injection pipe 1 to be filled with water and each vertical pipe 2 to be filled with water.
In order to fill water in the horizontal water injection pipe 1, according to the height of the elevation of the foundation pit deformation monitoring point, the vertical pipe 2 corresponding to the lowest foundation pit deformation monitoring point is used as a water injection port, the vertical pipe 2 corresponding to the highest foundation pit deformation monitoring point is used as an exhaust port, except the vertical pipe 2 corresponding to the water injection port and the exhaust port, the tops of the vertical pipes 2 corresponding to other foundation pit deformation monitoring points are temporarily sealed, and then water injection is carried out. And after the liquid level of the vertical pipe 2 at the air outlet appears, stopping water injection according to the required height.
S3, vertically and fixedly installing each vertical pipe 2 at a foundation pit deformation monitoring point, and communicating the upper end of each vertical pipe 2 with the outside. For example, a support 7 is erected at a foundation pit deformation monitoring point, the support 7 can be a steel bar support, and the vertical pipe 2 is vertically installed on the support 7.
S4, deformation monitoring: the liquid level scale change that corresponds with the actual liquid level of vertical pipe 2 is regarded as the settlement change that corresponds foundation ditch deformation monitoring point, and the slope change that uses vertical pipe 2 is regarded as the differential settlement change that corresponds foundation ditch deformation monitoring point, and the deformation between two foundation ditch deformation monitoring points is regarded as corresponding as to the tensile change of horizontal water injection pipe 1 between two adjacent foundation ditch deformation monitoring points.
The liquid level scale change can be manually read, and can also be automatically acquired through the liquid level sensor 4. The inclination change of the vertical pipe 2 can be directly measured manually or automatically measured by an inclinometer 3. In order to monitor the deformation between two adjacent deformation monitoring points, the deformation comprises the horizontal displacement between the two deformation monitoring points and the lifting change between the two deformation monitoring points, and in step S1, a reserved section is arranged at the position, close to the vertical pipe 2, of the horizontal water injection pipe 1. For example, 20cm is reserved at a deformation monitoring point as a preparation amount of tensile deformation, and horizontal water injection pipes 1 between reserved sections are arranged straightly; meanwhile, in step S4, the horizontal displacement change of the relative foundation pit deformation monitoring points at the two ends of the horizontally arranged horizontal water injection pipe 1 is used as the deformation between the two corresponding foundation pit deformation monitoring points, and the deformation can be observed manually or automatically acquired through the displacement sensor 5.
Claims (10)
1. Foundation ditch deformation monitoring devices, its characterized in that: including horizontal water injection pipe (1) that is used for laying along the foundation ditch periphery, horizontal water injection pipe (1) end to end and form sealed annular, vertical pipe (2) are connected respectively in each position corresponding to foundation ditch deformation monitoring point to horizontal water injection pipe (1), vertical pipe (2) and horizontal water injection pipe (1) intercommunication, and vertical pipe (2) are equipped with the liquid level scale, vertical pipe (2) vertical arrangement and upper end and external intercommunication.
2. The foundation pit deformation monitoring device of claim 1, wherein: the foundation pit deformation monitoring device further comprises an inclinometer (3) and/or a liquid level sensor (4), wherein the inclinometer (3) is used for monitoring the inclination of the vertical pipe (2), and the liquid level sensor (4) is used for monitoring the liquid level of the vertical pipe (2) relative to the liquid level of the vertical pipe (2).
3. The foundation pit deformation monitoring device of claim 2, wherein: the inclinometer (3) is arranged inside the vertical pipe (2), and the liquid level sensor (4) is in non-contact type and is arranged on the outer side of the horizontal water injection pipe (1).
4. A foundation pit deformation monitoring device according to claim 2 or 3, wherein: the horizontal water injection pipes (1) between two adjacent vertical pipes (2) are arranged in a straight manner, and the pipe sections of the horizontal water injection pipes (1) connected with the vertical pipes (2) are provided with length scales; the foundation pit deformation monitoring device further comprises a displacement sensor (5) used for monitoring the stretching length of the horizontal water injection pipe (1), and the displacement sensor (5) is respectively arranged on two sides of the connecting point of the horizontal water injection pipe (1) and the vertical pipe (2).
5. The foundation pit deformation monitoring device of claim 4, wherein: every vertical pipe (2) all is equipped with alarm (6), and displacement sensor (5), inclinometer (3) and level sensor (4) all are connected with corresponding alarm (6) electricity.
6. The foundation pit deformation monitoring device of claim 4, wherein: the horizontal water injection pipe (1) is a plastic silicone tube, and the vertical pipe (2) is a transparent glass tube or a transparent plastic tube.
7. The foundation pit deformation monitoring method is characterized by comprising the following steps: the foundation pit deformation monitoring device of any one of claims 1 to 6 is used for monitoring the deformation of the foundation pit, and comprises the following steps:
s1, paving the horizontal water injection pipe (1) along the periphery of the foundation pit, respectively connecting the horizontal water injection pipe (1) with the vertical pipe (2) at each position corresponding to the foundation pit deformation monitoring point, and vertically installing the vertical pipe (2) at the foundation pit deformation monitoring point preliminarily;
s2, injecting water into the horizontal water injection pipe (1) to enable the horizontal water injection pipe (1) to be filled with water, and each vertical pipe (2) is filled with water;
s3, vertically and fixedly installing each vertical pipe (2) at a foundation pit deformation monitoring point, wherein the upper end of each vertical pipe (2) is communicated with the outside;
s4, carrying out foundation pit deformation monitoring: the liquid level scale change corresponding to the actual liquid level of the vertical pipe (2) is used as the settlement change of the corresponding foundation pit deformation monitoring point, the inclination change of the vertical pipe (2) is used as the uneven deformation of the corresponding foundation pit deformation monitoring point, and the stretching change of the horizontal water injection pipe (1) between the two adjacent foundation pit deformation monitoring points is used as the deformation between the two corresponding foundation pit deformation monitoring points.
8. The method for monitoring deformation of a foundation pit according to claim 7, wherein:
in the step S2, the vertical pipe (2) corresponding to the lowest foundation pit deformation monitoring point is used as a water injection port, the vertical pipe (2) corresponding to the highest foundation pit deformation monitoring point is used as an exhaust port, the tops of the vertical pipes (2) corresponding to other foundation pit deformation monitoring points are temporarily sealed, and water injection is performed.
9. The method for monitoring deformation of a foundation pit according to claim 7, wherein: in the step S3, a support (7) is erected at a foundation pit deformation monitoring point, the vertical pipe (2) is vertically installed on the support (7), and the upper end of the vertical pipe (2) is open and is provided with an adaptive pipe plug.
10. A method of monitoring deformation of a foundation pit as claimed in claim 7, 8 or 9, wherein: in the step S1, reserved sections are arranged on the horizontal water injection pipes (1) close to the vertical pipes (2), and the horizontal water injection pipes (1) between the reserved sections are arranged straightly; in step S4, the horizontal displacement change of the two ends of the horizontal water injection pipe (1) which are arranged straightly relative to the foundation pit deformation monitoring points is used as the horizontal displacement change corresponding to the two foundation pit deformation monitoring points.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114908818A (en) * | 2022-05-31 | 2022-08-16 | 河南五建建设集团有限公司 | Foundation pit deformation observation device |
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