CN102620715A - Observation method of foundation settlement based on liquid level difference - Google Patents
Observation method of foundation settlement based on liquid level difference Download PDFInfo
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- CN102620715A CN102620715A CN2012101093061A CN201210109306A CN102620715A CN 102620715 A CN102620715 A CN 102620715A CN 2012101093061 A CN2012101093061 A CN 2012101093061A CN 201210109306 A CN201210109306 A CN 201210109306A CN 102620715 A CN102620715 A CN 102620715A
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Abstract
The invention discloses an observation method of foundation settlement based on liquid level difference. A folding hose is buried in the foundation, and a liquid level sensor is placed in the hose and is led out through a lead wire to be connected with a liquid level observation instrument on one side of the foundation. One end of the hose is connected with a one-way valve and fixed on the surface of the foundation, the other end of the hose is connected with a liquid storage tank on one side of the foundation, and liquid is filled in the liquid storage tank. The liquid level sensor in the hose is utilized to measure the change of the liquid level difference, then the liquid level difference between a settlement point where the liquid level sensor is located and the liquid in the liquid storage tank can be converted out, and then the settling volume of the foundation can be calculated out. Additionally, after the measurement, the senor can be completely pulled back for recovery through a soft rope reserved in the hose. The observation method of the foundation settlement based on the liquid level difference is simple in structure, convenient in operation, accurate in measurement, capable of cyclically utilizing the liquid level sensor and low in monitoring cost.
Description
Technical field
The invention belongs to building hydraulic engineering technical field, particularly a kind of settlement of foundation observation procedure based on liquid level difference.
Background technology
The settlement observation problem of ground has become the technical barrier of engineering construction construction such as highway, municipal highway, railway and existing line operation; The settling amount that accurately measures ground is the problem of a significant, can reduce even prevent non-uniform settling or the excessive construction massive losses that operation brings of giving of sedimentation through the settling amount of monitoring ground.Before the present invention, conventional settlement observation method mainly contains settlement plate method, section sedimentation pipe method, flush type settlement observer etc.
The settlement plate mensuration is a kind of more traditional monitoring method, and observation device is made up of steel sole plate, metal measuring staff and protective casing.This method has following drawback in practical application: (1) sedimentation pipe must elevate above the soil, and is easy to hit curved or hit inclination by Construction traffic, and this has just directly influenced the accuracy of observed result; (2) in the practice of construction process, destroyed for fear of sedimentation pipe, Construction traffic will be walked around sedimentation pipe, also just causes sedimentation pipe surrounding soil compactness not enough, and this not only brings very big inconvenience to Construction traffic, also causes the non-uniform settling of ground easily; (3) the pillar diameter of sedimentation pipe is bigger, owing to roll the problem of order, pillar can receive the soil lateral pressure that does not wait both sides and by crowded askew, cause measuring error, and this error increase along with the increase of filled height; (4) data observation of this method is time-consuming takes a lot of work, and every measurement a bit all needs manual pick to carry out reading with spirit-leveling instrument.
Section sedimentation method of testing is also used in the settlement of foundation monitoring to some extent, especially in light section is measured, uses more.Section sedimentation proving installation is mainly by probe, liquid-filling pipe (deviational survey pipe), signal cable, liquid reserve tank and estimate instrument and form.This observation procedure has following defective: (1) deviational survey pipe self intensity is bigger, just maybe not can in softer foundation soil body along with the soil body deforms, also just can't accurately measure the sedimentation of ground; (2) deviational survey pipe itself does not have retractility, and when sedimentation is big, may rupture in deviational survey pipe junction, causes earth to get into, and deeply measures thereby influence tiltmeter, in case the deviational survey pipe ruptures, so whole section all can't be measured; (3) result of section settlement observation is the sedimentation of the entire profile, and possibly only need to survey in the road in the actual engineering and the sedimentation of curb, and this also just is equivalent to increase the observation cost; (4) the higher and difficult control of observation quality of the cost of section settlement observation, this also is the major reason that this method does not obtain widespread usage as yet.When (5) the section sedimentometer is measured also is very bothersome, pass whole embankment from an end of section with popping one's head in and move the other end to, also need carry out twice observation sometimes and just can obtain Embankment Subsidence.Therefore can only be applicable to the engineering that section width is less, not suitable for large area applications in construction observation.
Chinese patent (patent No. ZL02218324.8) discloses a kind of flush type settlement observer, mainly is made up of sedimentation pipe, interior, visualizer and ammeter, and this device has obtained certain application in construction.This device has certain superiority for two kinds with respect to the front, its advantage be ground in architectural process with accomplish to use after sedimentation be to observe at the sighting tube of ground one side, do not influence construction, simple in structure.But engineering practice shows that the defective below this device exists: spot measurement can only be carried out in (1), and sedimentation pipe is embedded in corresponding tested point and the external electric epiphase connects, if survey the sedimentation of multiple spot, just need imbed this device of corresponding number in concrete the application; (2) this device is through pipeline interior to be linked to each other with sighting tube; Have only in sedimentation pipe to be full of water, could guarantee that the water level of sedimentation pipe is consistent with sighting tube, in the settlement of foundation process; The coupling part (like piping connection portion) of device may be rotated and drawn back; If seepage takes place in the junction, then this device has just lost the function of measuring settlement of foundation fully, is not suitable for doing long-term observation; (3) measuring accuracy of this device also is unwarrantable, because in observation process, the cap of sighting tube will be untied, and water wherein can evaporate, and especially in summer, the water level of sighting tube can not get guaranteeing.
Summary of the invention
The object of the invention is exactly the defective that is to overcome above-mentioned traditional settlement observation method, invents a kind of observation procedure of novel settlement of foundation based on liquid level difference.
The technical scheme that the present invention adopts is:
A kind of settlement of foundation observation procedure based on liquid level difference, its step is:
(1) in having the collapsible flexible pipe of certain rigidity, places a plurality of liquid level sensors, lead is drawn from flexible pipe one end;
(2) this flexible pipe is imbedded tested ground relevant position, flexible pipe can not damaged by pressure in the embankment work progress, and certain retractility is also arranged simultaneously, and flexible pipe can freely extend when sedimentation greatly takes place ground;
(3) side of flexible pipe is installed one-way cock, opposite side links to each other with liquid reserve tank, and in liquid reserve tank, puts into certain amount of fluid;
(4) open one-way cock, full of liquid in will managing;
The lead of (5) drawing links to each other with the liquid level sight gauge device of ground one side;
(6) in the settling process of ground, flexible pipe is sedimentation thereupon, and the hydraulic pressure in the corresponding distortion of concurrent life causes managing changes, and reads the variation of liquid level through outside liquid level observation instrument;
(7) calculate the liquid level sensor position of each liquid level sensor position correspondence of bellows interior and the liquid level difference of the interior liquid level of liquid reserve tank;
(8) sedimentation of calculating ground.Formula is following:
In the formula:
is the liquid level difference of liquid level in liquid level sensor position and the liquid reserve tank;
is the liquid level difference of liquid level in liquid level sensor position and the liquid reserve tank;
is density of liquid.
Advantage of the present invention and effect are:
(1) the present invention is a kind of settlement observation method based on liquid level difference, and for the settlement plate observation procedure, this method is carried out observed reading in a side of ground, can not influence construction;
(2) with respect to present existing flush type settlement observer (patent No. ZL02218324.8); This method can realize multimetering; Ground need be surveyed several places; Just place the liquid level sensor of corresponding number,, just can disposablely measure the settling amount of a plurality of points through the liquid level sight gauge device of lead connection ground one side in the corresponding position of flexible pipe;
(3) with respect to existing flush type settlement observer (patent No. ZL02218324.8) and section settlement observer; The used device of the present invention is an integral body, and flexible pipe can directly be bought from market, does not need processing; Need on flexible pipe, perforate not draw lead yet; The hidden danger that does not also just exist tapping to break off, flexible pipe have also played the effect of protection liquid level sensor, are fit to do long-term observation;
(4) the past observation device all is expendable; Liquid level sensor among the present invention connects three stalloys respectively; Not only can fix sensor; Can also make sensor finish the back and pull out that be used for next ground to be measured and go, this has practiced thrift the observation cost to a great extent along a direction in observation;
(5) with respect to above-mentioned observation device, this method has very high measuring accuracy, and the liquid level sensor precision of use is very high, can be as accurate as 1 mm, can engineering demands.
Description of drawings
Fig. 1 structural representation of the present invention
Fig. 2 A-A cross-sectional view
Among the figure:
1 flexible pipe
2 embankments
3 tightropes
4 liquid level sensors
5 stalloys
6 leads
7 liquid level sight gauge devices
8 one-way cocks
9 liquid reserve tanks
10 grounds
11 liquid
Be described in detail below in conjunction with the accompanying drawing specific embodiments of the invention.Protection scope of the present invention is not exceeded with embodiment, but is limited claim.
Embodiment:
As shown in Figure 1: the present invention changes the settling amount that calculates ground (10) through the reading that is placed on the liquid level sensor (4) in the flexible pipe (1).
The practical implementation method is: with a tightrope (3) liquid level sensor (4) is connected together; Distance between spacing and ground (10) tested point is suitable, because flexible pipe (1) is folding, earlier flexible pipe (1) is folded up; One at tightrope (3) is that a weight breaks away out from flexible pipe (1); Unwinding hoses (1) drags tightrope (3) then, and liquid level sensor (4) is pulled in the flexible pipe (1); Because the distance of tightrope (3) is to survey in advance between the sensor (4); Therefore the position of each sensor (4) point just can corresponding ground (10) to be measured, tightrope (3) needs certain intensity, prevents in dilatory sensor (4), to be broken; Liquid level sensor in this method (4) need be at three stalloys of surface-welding (5); After like this liquid level sensor (4) being dragged to correspondence position; These three steel discs (5) just can be fixed liquid level sensor (4); Each liquid level sensor (4) is gone up and is connected lead (6), is used for linking to each other with liquid level sight gauge device (7); Lead (6) and tightrope (3) will be reserved the elongation strain that certain length adapts to the flexible pipe (1) in the settling process.
Afterwards, flexible pipe (1) is imbedded in the ground, an end of flexible pipe (1) is installed one-way cock (8); One-way cock (8) is exactly a non-return valve; Be that air-flow can only be flowed and directional control valve that can not reversed flow along a direction, when non-return valve is installed, should be specifically noted that the flow direction of liquid (11) (this embodiment is example with water); Should make the direction of arrow of indicating on interior liquid (11) proper flow direction of flexible pipe (1) and the valve body consistent; The other end of flexible pipe (1) communicates with liquid reserve tank (9), and liquid reserve tank is filled water in (9), so just can guarantee to be full of water in the flexible pipe (1).
During use, fills with water in liquid reserve tank (9) is opened one-way cock (8), the air in the drain hose (1), because liquid reserve tank (9) communicates with flexible pipe (1), flexible pipe (1) is interior so just can full of liquid (11).Owing in use may need long-time observation, guarantee that the liquid in the liquid reserve tank (9) is full, prevent that evaporation of liquid from causing managing the not enough accuracy of observation that influences of interior water.Liquid reserve tank (9) is realized easily at the construction field (site) the time, is got final product such as be built into a pond with fragment of brick.In embankment (2) work progress; Sedimentation takes place in ground (10); Sedimentation takes place thereupon and certain deformation takes place in flexible pipe (1), and liquid (11) pressure in the pipe also can change, and the lead (6) of liquid level sensor (4) is connected with liquid level sight gauge device (7); Draw the variation of liquid level; After a sensor (4) reading finishes, read the reading of each liquid level sensor (4) more successively, just can converse the water-head (pressure that the head of 1 m is corresponding is 9.81 kPa) between liquid level sensor (4) position and the liquid reserve tank (9).Then, measure the water level elevation of liquid reserve tank (9), just can draw the absolute altitude that each liquid level sensor (4) is located; Also just drawn the settling amount of ground (10), for example: the water level elevation of liquid reserve tank (9) is defined as 0.000 m, and the reading of liquid level sensor (4) is 1.00 kPa; Then water-head is 10.2 cm; Water level elevation still is 0.000 m after some days, and the reading of liquid level sensor (4) is 1.10 kPa, and then water-head is 11.2 cm.The settling amount that can calculate the liquid level sensor position is 10 mm.The liquid level sensor of using in this method (4) accurately can reach 0.001 m (1 mm), can satisfy requirement of engineering.
After measurement finishes; Liquid level sensor (4) can be retained in the flexible pipe as long-term observation; Also can drag the tightrope (3) that is reserved in the flexible pipe (1); Because liquid level sensor (4) is cascaded through tightrope (3), can liquid level sensor (4) all be pulled out, and is used for the measurement of next settlement of foundation.
Claims (2)
1. settlement of foundation observation procedure based on liquid level difference is characterized in that adopting following steps:
(1) in having the collapsible flexible pipe of certain rigidity, places a plurality of liquid level sensors, lead is drawn from flexible pipe one end;
(2) this flexible pipe is imbedded tested ground relevant position, flexible pipe can not damaged by pressure in the embankment work progress, and certain retractility is also arranged simultaneously, and flexible pipe can freely extend when sedimentation greatly takes place ground;
(3) side of flexible pipe is installed one-way cock, opposite side links to each other with liquid reserve tank, and in liquid reserve tank, puts into certain amount of fluid;
(4) open one-way cock, full of liquid in will managing;
The lead of (5) drawing links to each other with the liquid level sight gauge device of ground one side;
(6) in the settling process of ground, flexible pipe is sedimentation thereupon, and the hydraulic pressure in the corresponding distortion of concurrent life causes managing changes, and reads the variation of liquid level through outside liquid level observation instrument;
(7) calculate the liquid level sensor position of each liquid level sensor position correspondence of bellows interior and the liquid level difference of the interior liquid level of liquid reserve tank;
(8) sedimentation of calculating ground; Formula is following:
In the formula:
is the liquid level difference of liquid level in liquid level sensor position and the liquid reserve tank;
is the liquid level difference of liquid level in liquid level sensor position and the liquid reserve tank;
is density of liquid.
2. the observation procedure of a kind of settlement of foundation based on liquid level difference according to claim 1 is characterized in that: 3 steel discs of welding on the said liquid level sensor make that sensor can be at the flexible pipe internal fixation.
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| CN2012101093061A CN102620715A (en) | 2012-04-16 | 2012-04-16 | Observation method of foundation settlement based on liquid level difference |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103076001A (en) * | 2012-12-25 | 2013-05-01 | 江西日月明铁道设备开发有限公司 | Method and device for automatically monitoring subgrade settlement |
| CN105095671A (en) * | 2015-08-24 | 2015-11-25 | 三峡集团西藏能源投资有限公司 | Real-time sedimentation monitoring early warning instrument, system and achieving method |
| CN108981655A (en) * | 2018-03-30 | 2018-12-11 | 胡仲春 | Tunnel roof settlement monitoring mechanism and tunnel roof Monitoring method of the subsidence |
| WO2021044032A1 (en) * | 2019-09-04 | 2021-03-11 | Daniel Scott | A settlement monitoring system and method |
| CN112813950A (en) * | 2020-12-31 | 2021-05-18 | 中交天津港湾工程研究院有限公司 | Multi-section hydraulic monitoring method for automatically monitoring vertical displacement of ground surface around foundation pit |
| CN113324617A (en) * | 2021-05-12 | 2021-08-31 | 中国地质科学院水文地质环境地质研究所 | Underground water on-line monitoring and early warning system and method for expansive and contractible soil environment |
| CN116337006A (en) * | 2023-05-25 | 2023-06-27 | 广东润宇传感器股份有限公司 | Height difference measurement stability improving method and device based on corrugated pipe |
| CN116481491A (en) * | 2023-06-20 | 2023-07-25 | 深圳市勘察研究院有限公司 | Deep foundation pit ground subsidence monitoring devices |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103076001A (en) * | 2012-12-25 | 2013-05-01 | 江西日月明铁道设备开发有限公司 | Method and device for automatically monitoring subgrade settlement |
| CN105095671A (en) * | 2015-08-24 | 2015-11-25 | 三峡集团西藏能源投资有限公司 | Real-time sedimentation monitoring early warning instrument, system and achieving method |
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| CN108981655A (en) * | 2018-03-30 | 2018-12-11 | 胡仲春 | Tunnel roof settlement monitoring mechanism and tunnel roof Monitoring method of the subsidence |
| CN108981655B (en) * | 2018-03-30 | 2021-04-16 | 胡仲春 | Tunnel roof settlement monitoring mechanism and tunnel roof settlement monitoring method |
| GB2594434A (en) * | 2019-09-04 | 2021-11-03 | Osprey Measurement Systems Ltd | A settlement monitoring system and method |
| WO2021044032A1 (en) * | 2019-09-04 | 2021-03-11 | Daniel Scott | A settlement monitoring system and method |
| GB2594434B (en) * | 2019-09-04 | 2024-03-20 | Osprey Measurement Systems Ltd | A settlement monitoring system and method |
| CN112813950A (en) * | 2020-12-31 | 2021-05-18 | 中交天津港湾工程研究院有限公司 | Multi-section hydraulic monitoring method for automatically monitoring vertical displacement of ground surface around foundation pit |
| CN113324617B (en) * | 2021-05-12 | 2022-10-14 | 中国地质科学院水文地质环境地质研究所 | Underground water on-line monitoring and early warning system and method for expansive and contractible soil environment |
| CN113324617A (en) * | 2021-05-12 | 2021-08-31 | 中国地质科学院水文地质环境地质研究所 | Underground water on-line monitoring and early warning system and method for expansive and contractible soil environment |
| CN116337006A (en) * | 2023-05-25 | 2023-06-27 | 广东润宇传感器股份有限公司 | Height difference measurement stability improving method and device based on corrugated pipe |
| CN116337006B (en) * | 2023-05-25 | 2023-07-25 | 广东润宇传感器股份有限公司 | Height difference measurement stability improving method and device based on corrugated pipe |
| CN116481491A (en) * | 2023-06-20 | 2023-07-25 | 深圳市勘察研究院有限公司 | Deep foundation pit ground subsidence monitoring devices |
| CN116481491B (en) * | 2023-06-20 | 2023-08-29 | 深圳市勘察研究院有限公司 | Deep foundation pit ground subsidence monitoring devices |
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Application publication date: 20120801 |