CN112697103A - Method for monitoring ground surface settlement around foundation pit in urban rail transit construction period - Google Patents
Method for monitoring ground surface settlement around foundation pit in urban rail transit construction period Download PDFInfo
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- CN112697103A CN112697103A CN202011462127.7A CN202011462127A CN112697103A CN 112697103 A CN112697103 A CN 112697103A CN 202011462127 A CN202011462127 A CN 202011462127A CN 112697103 A CN112697103 A CN 112697103A
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Abstract
The invention belongs to the technical field of construction project monitoring, and particularly relates to a method for monitoring ground surface settlement around a foundation pit in an urban rail transit construction period, which comprises the following steps: s1, burying at least 2 leveling points 1 month before settlement monitoring, wherein the leveling points are arranged near a site and form a leveling control network; s2, before observation, the level gauge and the indium steel ruler used by each measuring point are checked, and records are made, and the leveling gauges and the indium steel ruler are not randomly replaced in the subsequent use process; s3, carrying out measuring point burying on a measuring point to be monitored; s4, observing for the first time, properly increasing the number of measured returns, and generally taking 2-3 times of data as an initial value; s5, determining a settlement monitoring control standard value as comparison data during monitoring data analysis, and feeding back information in time when the measured data exceeds an allowable value; and S6, recording weather conditions, construction progress and site conditions measured every day for reference during monitoring data analysis. The method solves the problem that the existing foundation pit settlement monitoring cannot be completed completely.
Description
Technical Field
The invention belongs to the technical field of construction project monitoring, and particularly relates to a method for monitoring ground surface settlement around a foundation pit in an urban rail transit construction period.
Background
China is a country with multiple landslides and foundation pit collapse disasters since ancient times. The resulting harmful consequences are direct and indirect disasters, and sometimes cause disasters accompanied by earthquakes and floods or debris flow disasters. With the rapid development of electronic information technology, particularly internet of things technology, automatic monitoring technology for foundation pits and side slopes is also becoming popular and mature.
During excavation of a foundation pit, with the deepening of soil taking, a supporting structure can generate obvious deformation under the action of soil pressure and road dynamic load, and if the deformation exceeds a certain range, instability even occurs, so that damages to surrounding roads and buildings are caused. Therefore, a high-precision construction monitoring team is equipped to provide deformation data in time to guide the smooth construction, and the guarantee of the construction safety is particularly important.
At present, the foundation pit settlement monitoring is mostly carried out by depending on the experience of workers, a lot of factors are not considered comprehensively enough, and the problem discovery is not timely enough.
Therefore, there is a need to improve upon the above problems.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a method for monitoring the settlement of the ground surface around a foundation pit in the urban rail transit construction period, which can solve the problem that the existing foundation pit settlement monitoring cannot be completed completely.
The technical scheme adopted by the invention is as follows:
the method for monitoring the settlement of the ground surface around the foundation pit in the construction period of urban rail transit comprises the following steps:
s1, burying at least 2 leveling points 1 month before settlement monitoring, wherein the leveling points are arranged near a site and form a leveling control network;
s2, before observation, the level gauge and the indium steel ruler used by each measuring point are checked, and records are made, and the leveling gauges and the indium steel ruler are not randomly replaced in the subsequent use process;
s3, carrying out measuring point burying on a measuring point to be monitored;
s4, observing for the first time, properly increasing the number of measured returns, and generally taking 2-3 times of data as an initial value;
s5, determining a settlement monitoring control standard value as comparison data during monitoring data analysis, and feeding back information in time when the measured data exceeds an allowable value;
and S6, recording weather conditions, construction progress and site conditions measured every day for reference during monitoring data analysis.
In step S1, the distance between the measurement points required for embedding the leveling points is not more than 100m, and the leveling points should be formed with little influence on the outside during embedding, so as to be not easy to disturb or vibrate and have good visibility.
In step S2, the leveling point needs to be checked, measured point checked, and instrument checked periodically to ensure the accuracy and continuity of the measured data.
In the step S3, the concrete step of embedding the measuring points is that the measuring points are arranged in the direction parallel to the main building envelope of the station at intervals of 15-20 m from the edge of the building envelope, a drilling machine is used for drilling the ground hardened layer thoroughly, and reinforcing steel bars serving as monitoring points are driven immediately, so that the reinforcing steel bars and the soil body are integrated, and the reinforcing steel bars can sink along with the sinking of the soil body.
The model of the drilling machine is phi 108mm, the driven steel bars are 5-10 cm lower than the road surface, a PVC protection pipe is arranged on the outer side of the measuring point, and a cover plate covers the PVC protection pipe.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, the protection pipe is arranged on the outer side of the measuring point, the cover plate covers the protection pipe, and the driven steel bar is 5-10 cm lower than the road surface, so that the measuring point is protected in all directions; the checking of the level points, the checking of the measuring points and the checking of the instruments are constantly kept, special instruments for the special points are guaranteed, and the accuracy and the continuity of the measured data are guaranteed; the network measuring points are not known and are measured in an all-around mode, so that when the monitoring result exceeds the warning value, the reason can be found out quickly, and corresponding remedial measures can be carried out.
Drawings
FIG. 1 is a schematic view of the cross-sectional structure of a settlement point of the present invention.
Wherein: 1 is a measuring point, 2 is a cover plate and 3 is a protective tube.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the method for monitoring the settlement of the ground surface around the foundation pit in the construction period of urban rail transit comprises the following steps:
s1, burying at least 2 leveling points 1 month before settlement monitoring, wherein the leveling points are arranged near a site and form a leveling control network;
s2, before observation, the level gauge and the indium steel ruler used by each measuring point 1 are checked, and records are made, and the level gauge and the indium steel ruler are not randomly replaced in the subsequent use process;
s3, embedding the measuring point 1 to be monitored;
s4, observing for the first time, properly increasing the number of measured returns, and generally taking 2-3 times of data as an initial value;
s5, determining a settlement monitoring control standard value as comparison data during monitoring data analysis, and feeding back information in time when the measured data exceeds an allowable value;
and S6, recording weather conditions, construction progress and site conditions measured every day for reference during monitoring data analysis.
In step S1, the distance between the measuring points 1 required for embedding the leveling points is not more than 100m, and the leveling points have little influence on the outside during embedding, so that the leveling points are not easy to disturb or vibrate and have good visibility, and the measuring points are generally arranged within 65 meters outside the foundation pit.
In step S2, the leveling point needs to be checked, checked at the measuring point 1, and checked with an instrument regularly, so as to ensure the accuracy and continuity of the measured data.
In the step S3, the concrete step of embedding the measuring points 1 is to arrange the measuring points 1 at intervals of 15-20 m from the edges of the building enclosure in the direction parallel to the building enclosure of the main body of the station, drill the hardened layer on the ground through a drilling machine, and then drive in the reinforcing steel bars serving as monitoring points to integrate the reinforcing steel bars with the soil body, so that the reinforcing steel bars can sink along with the sinking of the soil body.
The model of the drilling machine is phi 108mm, the driven steel bars are 5-10 cm lower than the road surface, a PVC protection pipe 3 is arranged on the outer side of the measuring point 1, and a cover plate 2 covers the outer side of the measuring point.
The invention needs to comprehensively analyze the parameters such as the property of the monitored object, the allowable sedimentation value, the sedimentation rate, instruments and equipment, determine the measurement precision and monitor in real time. And when the monitoring result exceeds the warning value, finding out the reason, and adopting measures of changing an excavation scheme, reinforcing the stratum, strengthening the support and the like to ensure the construction safety. By combining on-site observation and monitoring, when the monitoring result exceeds a large range of an alarm value, reporting in time, stopping construction, immediately taking emergency measures such as supporting, plugging and the like, and making corresponding countermeasures together with related units, wherein the ground surface settlement should not exceed 30mm under the general condition.
The settlement observation points and the surface settlement observation points are controlled by reference points, and the arrangement of the settlement observation points and the surface settlement observation points is determined according to the building deformation weight measurement regulation and the common negotiation of the actual situation of the site and related methods such as construction, supervision design and the like. In the laying process, points in some places are too densely laid, and proper selection is carried out in the actual observation process, so that the density of the points is moderate, and the points are uniformly distributed.
The method for monitoring the surface settlement can also be used for monitoring the settlement of the building and monitoring the vertical displacement. Meanwhile, the monitoring discovery of the invention can be combined with a safety monitoring and early warning system in the rail transit construction period, and plays a role in the collection and monitoring of tragedy.
Although only the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art, and all changes are encompassed in the scope of the present invention.
Claims (5)
1. The method for monitoring the settlement of the ground surface around the foundation pit in the urban rail transit construction period is characterized by comprising the following steps of: the method comprises the following steps:
s1, burying at least 2 leveling points 1 month before settlement monitoring, wherein the leveling points are arranged near a site and form a leveling control network;
s2, before observation, the leveling instrument and the indium steel ruler used by each measuring point (1) are checked, and records are made, and the leveling instrument and the indium steel ruler are not randomly replaced in the subsequent use process;
s3, embedding the measuring point (1) to be monitored into the measuring point (1);
s4, observing for the first time, properly increasing the number of measured returns, and generally taking 2-3 times of data as an initial value;
s5, determining a settlement monitoring control standard value as comparison data during monitoring data analysis, and feeding back information in time when the measured data exceeds an allowable value;
and S6, recording weather conditions, construction progress and site conditions measured every day for reference during monitoring data analysis.
2. The method for monitoring the settlement of the ground surface around the foundation pit in the construction period of the urban rail transit according to claim 1, wherein the method comprises the following steps: in step S1, the distance between the required measuring points (1) for embedding the leveling points is not more than 100m, and the leveling points have little influence on the outside during embedding, so that the leveling points are not easy to disturb or vibrate and have good visibility.
3. The method for monitoring the settlement of the ground surface around the foundation pit in the construction period of the urban rail transit according to claim 1, wherein the method comprises the following steps: in step S2, the leveling point needs to be checked, the measurement point (1) needs to be checked, and the instrument needs to be checked periodically, so as to ensure the accuracy and continuity of the measurement data.
4. The method for monitoring the settlement of the ground surface around the foundation pit in the construction period of the urban rail transit according to claim 1, wherein the method comprises the following steps: in the step S3, the concrete step of burying the measuring points (1) is to arrange the measuring points (1) at intervals of 15-20 m from the edge of the building enclosure in the direction parallel to the building main body building enclosure, drill the ground hardened layer through a drilling machine, and then drive in the reinforcing steel bars serving as monitoring points, so that the reinforcing steel bars and the soil body are integrated, and the reinforcing steel bars can sink along with the sinking of the soil body.
5. The method for monitoring the settlement of the ground surface around the foundation pit in the construction period of the urban rail transit as claimed in claim 4, wherein: the type of the drilling machine is phi 108mm, the driven steel bars are 5-10 cm lower than the road surface, a PVC protection pipe (3) is arranged on the outer side of the measuring point (1), and a cover plate (2) covers the PVC protection pipe.
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| CN202011462127.7A CN112697103A (en) | 2020-12-11 | 2020-12-11 | Method for monitoring ground surface settlement around foundation pit in urban rail transit construction period |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115993107A (en) * | 2023-02-22 | 2023-04-21 | 南京禄口国际机场空港科技有限公司 | Airport runway pavement settlement monitoring system |
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Application publication date: 20210423 |