CN113236260A - Construction monitoring method for all-dimensional shield underpass of existing subway station - Google Patents
Construction monitoring method for all-dimensional shield underpass of existing subway station Download PDFInfo
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- CN113236260A CN113236260A CN202110703125.0A CN202110703125A CN113236260A CN 113236260 A CN113236260 A CN 113236260A CN 202110703125 A CN202110703125 A CN 202110703125A CN 113236260 A CN113236260 A CN 113236260A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/003—Arrangement of measuring or indicating devices for use during driving of tunnels, e.g. for guiding machines
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/093—Control of the driving shield, e.g. of the hydraulic advancing cylinders
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Environmental & Geological Engineering (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses a construction monitoring method for an omnibearing shield under-crossing existing subway station, which comprises the following steps: determining monitoring objects and ranges, monitoring the earth surface, monitoring stress, monitoring building settlement, monitoring building inclination, monitoring in a tunnel, monitoring existing station settlement, performing informatization management and the like. Utilize instruments such as surveyor's level, convergence meter, screw, prism, carry out detailed monitoring respectively to earth's surface subside, earth's surface building slope and subside, tunnel subside and existing station bulk settlement, adopt remote automation real-time supervision and manual monitoring to combine together, remote database real-time early warning monitoring has ensured the safety and stability nature of work progress, has also ensured the normal operation of existing subway line.
Description
Technical Field
The invention relates to a tunnel shield construction technology, in particular to a construction monitoring method for an omnibearing shield to downwards pass through an existing subway station.
Background
With the continuous development of urban rail transit, the safety of the cross construction of new subway lines and existing lines becomes an increasingly important problem. The shield construction method has the obvious advantages of high construction efficiency, good adaptability, strong safety and stability and the like in the field of subway tunnel construction, and is widely applied.
Although the disturbance of the shield construction to the surrounding environment is relatively small, the earth surface settlement phenomenon inevitably occurs due to the continuous change of the soil layer stress in the tunneling process, and serious phenomena such as inclination and cracking of surrounding buildings are caused due to the overlarge settlement and even ground collapse. Especially, when the subway station passes through the existing subway station, the influence on the existing station is fully considered, various protection measures are made, various monitoring in the construction process is made, and the normal operation safety of the subway is ensured.
The method in the prior art is difficult to meet the requirements of stability and safety.
Disclosure of Invention
The invention aims to provide a construction monitoring method for an omnibearing shield under-crossing existing subway station.
The purpose of the invention is realized by the following technical scheme:
the invention discloses a construction monitoring method for an omnibearing shield under-crossing existing subway station, which comprises the following steps:
s1: determining a monitoring object and a monitoring range:
determining each monitoring object and the monitoring range thereof in the construction process according to the risk source degree, wherein the monitoring objects comprise surface subsidence, stress strain, structure subsidence and inclination, convergence in a tunnel and existing station subsidence;
s2: monitoring the earth surface:
determining a main monitoring section of surface subsidence, and laying subsidence monitoring points on the ground along the axial direction of the shield tunnel and the main monitoring section to obtain all surface subsidence data;
s3: and (3) stress monitoring:
carrying out stress monitoring on a steel bar strain gauge, a concrete strain gauge and a bolt stress gauge arranged on the shield segment;
s4: building settlement monitoring:
setting a base point and a base line on a surface building by using a precise level gauge and a screw to obtain settlement data of the building;
s5: building tilt monitoring:
setting an inclined observation point on the surface of the building by using the prism and the reflector plate to obtain inclined data of the building;
s6: monitoring in the hole:
acquiring vault sinking, structure bottom uplifting and clearance convergence data by using a precision level gauge and a convergence gauge;
s7: existing station settlement monitoring:
determining settlement monitoring points of the existing station, and obtaining integral settlement data of the existing subway station by using a static leveling instrument, a vernier caliper and a track scale;
s8: information management:
and performing informatization management on all the obtained observation data, processing all the data, comparing the data with a warning value, and sending an alarm prompt once the data exceeds the warning value.
According to the technical scheme provided by the invention, the construction monitoring method for the omnibearing shield under-crossing existing subway station, which is provided by the embodiment of the invention, respectively monitors the ground surface settlement, the inclination and settlement of the ground surface building, the tunnel settlement and the integral settlement of the existing subway station in detail, and combines the remote automatic real-time monitoring and the manual monitoring, thereby ensuring the safety and stability of the construction process and the normal operation of the existing subway line.
Drawings
FIG. 1 is a schematic diagram of monitoring settlement of an existing building above a shield in an embodiment of the invention;
FIG. 2 is a schematic diagram of burying a mark of an oblique observation point of a building above a shield in an embodiment of the present invention;
FIG. 3 is a schematic diagram of monitoring vault crown settlement of a tunnel segment in an embodiment of the invention;
fig. 4 is a schematic diagram of a settlement monitoring point arrangement of an existing station in the embodiment of the present invention;
fig. 5 is a schematic flow chart of a monitoring method according to an embodiment of the present invention.
In the figure:
11-monitoring screw, 12-building wall, 13-building foundation upper part, 14-ground;
21-reflector plate, 22-building inclination monitoring point, 23-building;
31-a level gauge, 32-a pre-buried lifting hook, 33-a convergence gauge and 34-a tunnel segment;
41-existing subway station, 42-existing line tunnel structure settlement monitoring point, 43-existing line track structure settlement monitoring point, 44-station support column inclination monitoring point, 45-structure settlement automatic monitoring point, 46-construction tunnel passing under construction subway line, 47-construction subway line station.
Detailed Description
The embodiments of the present invention will be described in further detail below. Details which are not described in detail in the embodiments of the invention belong to the prior art which is known to the person skilled in the art.
The invention discloses a construction monitoring method for an omnibearing shield under-crossing existing subway station, which has the preferred specific implementation mode that:
the method comprises the following steps:
s1: determining a monitoring object and a monitoring range:
determining each monitoring object and the monitoring range thereof in the construction process according to the risk source degree, wherein the monitoring objects comprise surface subsidence, stress strain, structure subsidence and inclination, convergence in a tunnel and existing station subsidence;
s2: monitoring the earth surface:
determining a main monitoring section of surface subsidence, and laying subsidence monitoring points on the ground along the axial direction of the shield tunnel and the main monitoring section to obtain all surface subsidence data;
s3: and (3) stress monitoring:
carrying out stress monitoring on a steel bar strain gauge, a concrete strain gauge and a bolt stress gauge arranged on the shield segment;
s4: building settlement monitoring:
setting a base point and a base line on a surface building by using a precise level gauge and a screw to obtain settlement data of the building;
s5: building tilt monitoring:
setting an inclined observation point on the surface of the building by using the prism and the reflector plate to obtain inclined data of the building;
s6: monitoring in the hole:
acquiring vault sinking, structure bottom uplifting and clearance convergence data by using a precision level gauge and a convergence gauge;
s7: existing station settlement monitoring:
determining settlement monitoring points of the existing station, and obtaining integral settlement data of the existing subway station by using a static leveling instrument, a vernier caliper and a track scale;
s8: information management:
and performing informatization management on all the obtained observation data, processing all the data, comparing the data with a warning value, and sending an alarm prompt once the data exceeds the warning value.
In the step S2:
the main monitoring section is vertical to the line direction, the transverse main measuring sections are arranged at the positions 10m and 50m away from the starting well and 10m away from the receiving well, 1 position is arranged at 300-500 m away from the other main measuring sections, each section is provided with 15 monitoring points, and the measuring point interval is 3 m, 5 m and 10 m.
In the step S3:
arranging a steel bar strain gauge, a concrete strain gauge and a bolt strain gauge to monitor the stress of the pipe piece, and establishing 3 main measuring sections for each shield interval tunnel.
In the step S4:
the monitoring screw is arranged on the surface of the wall of the building and on the upper part of the exposed foundation.
In the step S5:
the prism or reflector mark is fixed on the surface of the wall of the building facing the reference point.
In the step S6:
the method is characterized in that a precise level gauge and a convergence gauge are arranged in a tunnel to control the deformation value, the speed and the stability of an arch crown in the excavation process and the deformation value, the deformation speed and the convergence condition of clearance in the peripheral convergence, and 3 main measuring sections are arranged in the shield interval tunnel.
In the step S7:
the method comprises the steps of utilizing a static level gauge to automatically acquire settlement data of an existing station structure and a track bed structure, and utilizing the level gauge, a vernier caliper and a track scale to manually acquire settlement data of the existing station structure and the track bed structure, opening and closing degree data of a deformation joint of the existing station structure and track spacing data respectively.
In the step S8:
adopting information management to all the obtained observation data and importing the observation data into a database, wherein:
the settlement early warning value is 60% of the control value, the settlement warning value is 80% of the control value, and when the measured value is smaller than the early warning value, normal construction is carried out;
when the early warning value is less than or equal to the measured value and less than the warning value, the monitoring is strengthened, the early warning is sent out, and the report is timely sent out;
and when the measured value is larger than or equal to the warning value, enhancing monitoring and giving an alarm, carrying out safety assessment again, adjusting the shield tunneling parameters and eliminating potential safety hazards.
The specific implementation process is as shown in fig. 1 to 5:
the method comprises the following steps:
s1: determining a monitoring object and a monitoring range;
in the step S1: and determining each monitored object and the monitoring range thereof in the construction process according to the risk source degree, wherein the monitored objects comprise surface subsidence, stress strain, structure subsidence and inclination, convergence in a tunnel, existing station subsidence and the like.
S2: monitoring the earth surface;
in the step S2: laying settlement monitoring points on the ground along the axial direction of the shield tunnel, setting the measuring point distance to be 10m when the distance between the settlement monitoring points and a shield starting well and a shield receiving well is less than 60m, setting the measuring point distance to be 20m when the distance between the settlement monitoring points and the shield starting well is 60-100 m, and setting the measuring point distance in the middle section to be 30 m; the main monitoring section is perpendicular to the line direction, the transverse main measuring sections are arranged at the positions 10m and 50m away from the starting well, 10m away from the receiving well, 300-500 m away from the other main measuring sections are arranged, each cross section is provided with 15 monitoring points, and the measuring point interval is 3 m, 5 m and 10 m.
S3: monitoring stress;
in the step S3: arranging a steel bar strain gauge, a concrete strain gauge and a bolt strain gauge to monitor the stress of the pipe piece, and establishing 3 main measuring sections for each shield interval tunnel.
S4: monitoring the settlement of the building;
in the step S4: setting a base point and a base line on the surface building by using a precise level gauge and a screw to obtain the settlement data of the building.
The building monitoring base point is formed by embedding a screw on the surface of a building wall, and a precise level gauge is adopted for monitoring settlement data. The monitor screw installation is shown in fig. 1.
S5: building tilt monitoring;
in the step S5: and setting an inclined observation point on the surface of the building by using the prism and the reflector to obtain the inclination data of the building. The measuring point marks adopt different embedded point forms according to different monitoring objects; the reflecting plate is mainly arranged in a mode of sticking the reflecting plate. When the measuring point mark is buried, attention should be paid to avoid obstacles which are not beneficial to marking and observation; the prism or reflector mark should face the reference point and be buried or adhered firmly. The embedding form of the building inclined observation point mark is shown in figure 2.
S6: monitoring in the hole;
in the step S6: the method is characterized in that a precise level gauge and a convergence gauge are arranged in a tunnel to control the deformation value, the speed and the stability of an arch crown in the excavation process and the deformation value, the deformation speed and the convergence condition of clearance in the peripheral convergence, and 3 main measuring sections are arranged in the shield interval tunnel. Tunnel segment vault subsidence monitoring is shown in figure 3.
S7: monitoring the settlement of the existing station;
in the step S7: and determining the settlement monitoring points of the existing station, and acquiring the integral settlement data of the existing subway station by using the static leveling instrument, the vernier caliper and the track scale. Existing station settlement monitoring stationing is as shown in fig. 4, utilizes the automatic data that subsides of existing station structure and railway roadbed structure of the collection of hydrostatic level remote, utilizes spirit level, slide caliper and track chi artifical acquisition existing station structure and railway roadbed structure settlement data, existing station structure movement joint degree of opening and shutting data, track interval data respectively.
S8: information management;
in the step S8: adopting informatization management to collect all the obtained observation data into a database, wherein the settlement early warning value is 60% of the control value, the settlement warning value is 80% of the control value, and when the measured value is less than the early warning value, normal construction is carried out; when the early warning value is less than or equal to the measured value and less than the warning value, the monitoring is strengthened, the early warning is sent out, and the report is timely sent out; and when the measured value is larger than or equal to the warning value, enhancing monitoring and giving an alarm, carrying out safety assessment again, adjusting the shield tunneling parameters and eliminating potential safety hazards.
The construction monitoring method for the omnibearing shield under-crossing existing subway station respectively monitors the ground surface settlement, the inclination and settlement of a ground surface building, the tunnel settlement and the overall settlement of the existing subway station in detail, and combines remote automatic real-time monitoring and manual monitoring, thereby ensuring the safety and stability of the construction process and the normal operation of the existing subway line.
The specific embodiment is as follows:
the embodiment is a monitoring method for the construction of a shield tunnel of a Beijing subway passing through an existing subway station.
S1: and determining the reasonable settlement range of each monitored object according to engineering design requirements, shield construction parameters, normal operation conditions of the existing station and numerical simulation calculation. The numerical simulation uses finite element software to perform shield construction settlement simulation.
S2: selecting a main monitoring section vertical to the tunnel line direction, arranging transverse main monitoring sections at positions 10m and 50m away from an originating well and 10m away from a receiving well respectively, and arranging 1 position for every 300-500 m of the rest main monitoring sections; and laying settlement monitoring points on the ground along the axial direction of the shield tunnel, setting the distance between the measuring points to be 10m when the distance between the measuring points and the shield starting well and the shield receiving well is less than 60m, setting the distance between the measuring points to be 20m when the distance between the measuring points is 60-100 m, and setting the distance between the measuring points in the middle section to be 30 m.
S3: the method is characterized in that steel bar strain gauges, concrete strain gauges and bolt strain gauges are arranged in a construction tunnel to monitor the stress of a duct piece, each strain gauge is accurately positioned according to the embedding position and the embedding direction specified by design, and the concrete for embedding the instrument is guaranteed to be the same as the concrete used by a structure in the same mark number. When the construction mechanization degree is high and the pouring strength is high, a preset embedding groove method can be adopted. Each shield interval tunnel is provided with 3 main measuring sections.
The preset embedding groove method is characterized in that when concrete pouring is performed to reach an instrument embedding elevation specified by design, an instrument embedding point is provided with an embedding groove template, the embedding groove template is detached within 48 hours after the concrete pouring is completed, the instrument is embedded into a groove after the embedding groove is cleaned and brushed, and then the concrete is backfilled manually. After the embedding is finished, a mark is made to prevent the instrument from being damaged by people or machinery, and when the thickness of the finally set concrete on the top of the instrument reaches more than 0.6m, the upper part can be constructed normally.
S4: setting a base point and a base line on a surface building by using a precise level gauge and a screw to obtain settlement data of surrounding buildings; the building monitoring point is formed by embedding a screw on the surface of a building wall, and a precise level gauge is adopted for monitoring settlement data.
When the precise level meter reads the central thread, the sight tube micro-motion screw is rotated to level the level tube, and the level tube is leveled every time the central thread is read.
S5: setting an inclined observation point on the surface of the building by using the prism and the reflector plate to obtain inclined data of the building; the measuring point marks are distributed in a mode of attaching a reflector plate, and the reflector plate marks face the datum points and are buried or firmly adhered. The inclined observation point is arranged on a direction line which forms an equal division angle with the central connecting line of the sighting target and is at a fixed position 2 times the height of the target.
S6: the tunnel is arranged in a tunnel by using a precise level gauge and a convergence gauge so as to control the deformation value, the speed and the stability of an arch crown in the excavation process and the deformation value, the deformation speed and the convergence condition of clearance in the peripheral convergence, and the shield interval tunnel is provided with 3 main measuring sections.
S7: the method comprises the following steps of utilizing a static level meter to automatically acquire settlement data of an existing station structure and a track bed structure, and installing the static level meter on a measuring pier with the same height as a measured object. And manually acquiring settlement data of the existing station structure and the track bed structure, opening and closing degree data of the deformation joint of the existing station structure and track spacing data by using the level gauge, the vernier caliper and the track scale respectively.
S8: adopting informatization management to collect all the obtained observation data into a database, wherein the settlement early warning value is 60% of the control value, the settlement warning value is 80% of the control value, and when the measured value is less than the early warning value, normal construction is carried out; when the early warning value is less than or equal to the measured value and less than the warning value, the monitoring is strengthened, the early warning is sent out, and the report is timely sent out; and when the measured value is larger than or equal to the warning value, enhancing monitoring and giving an alarm, carrying out safety assessment again, adjusting the shield tunneling parameters and eliminating potential safety hazards.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. The construction monitoring method for the omnibearing shield underpass of the existing subway station is characterized by comprising the following steps of:
s1: determining a monitoring object and a monitoring range:
determining each monitoring object and the monitoring range thereof in the construction process according to the risk source degree, wherein the monitoring objects comprise surface subsidence, stress strain, structure subsidence and inclination, convergence in a tunnel and existing station subsidence;
s2: monitoring the earth surface:
determining a main monitoring section of surface subsidence, and laying subsidence monitoring points on the ground along the axial direction of the shield tunnel and the main monitoring section to obtain all surface subsidence data;
s3: and (3) stress monitoring:
carrying out stress monitoring on a steel bar strain gauge, a concrete strain gauge and a bolt stress gauge arranged on the shield segment;
s4: building settlement monitoring:
setting a base point and a base line on a surface building by using a precise level gauge and a screw to obtain settlement data of the building;
s5: building tilt monitoring:
setting an inclined observation point on the surface of the building by using the prism and the reflector plate to obtain inclined data of the building;
s6: monitoring in the hole:
acquiring vault sinking, structure bottom uplifting and clearance convergence data by using a precision level gauge and a convergence gauge;
s7: existing station settlement monitoring:
determining settlement monitoring points of the existing station, and obtaining integral settlement data of the existing subway station by using a static leveling instrument, a vernier caliper and a track scale;
s8: information management:
and performing informatization management on all the obtained observation data, processing all the data, comparing the data with a warning value, and sending an alarm prompt once the data exceeds the warning value.
2. The all-dimensional shield tunneling existing subway station construction monitoring method according to claim 1, wherein in said step S2:
the main monitoring section is vertical to the line direction, the transverse main measuring sections are arranged at the positions 10m and 50m away from the starting well and 10m away from the receiving well, 1 position is arranged at 300-500 m away from the other main measuring sections, each section is provided with 15 monitoring points, and the measuring point interval is 3 m, 5 m and 10 m.
3. The all-dimensional shield tunneling existing subway station construction monitoring method according to claim 1, wherein in said step S3:
arranging a steel bar strain gauge, a concrete strain gauge and a bolt strain gauge to monitor the stress of the pipe piece, and establishing 3 main measuring sections for each shield interval tunnel.
4. The all-dimensional shield tunneling existing subway station construction monitoring method according to claim 1, wherein in said step S4:
the monitoring screw is arranged on the surface of the wall of the building and on the upper part of the exposed foundation.
5. The all-dimensional shield tunneling existing subway station construction monitoring method according to claim 1, wherein in said step S5:
the prism or reflector mark is fixed on the surface of the wall of the building facing the reference point.
6. The all-dimensional shield tunneling existing subway station construction monitoring method according to claim 1, wherein in said step S6:
the method is characterized in that a precise level gauge and a convergence gauge are arranged in a tunnel to control the deformation value, the speed and the stability of an arch crown in the excavation process and the deformation value, the deformation speed and the convergence condition of clearance in the peripheral convergence, and 3 main measuring sections are arranged in the shield interval tunnel.
7. The all-dimensional shield tunneling existing subway station construction monitoring method according to claim 1, wherein in said step S7:
the method comprises the steps of utilizing a static level gauge to automatically acquire settlement data of an existing station structure and a track bed structure, and utilizing the level gauge, a vernier caliper and a track scale to manually acquire settlement data of the existing station structure and the track bed structure, opening and closing degree data of a deformation joint of the existing station structure and track spacing data respectively.
8. The omnibearing shield tunneling construction monitoring method for an existing subway station according to any one of claims 1 to 7,
in the step S8:
adopting information management to all the obtained observation data and importing the observation data into a database, wherein:
the settlement early warning value is 60% of the control value, the settlement warning value is 80% of the control value, and when the measured value is smaller than the early warning value, normal construction is carried out;
when the early warning value is less than or equal to the measured value and less than the warning value, the monitoring is strengthened, the early warning is sent out, and the report is timely sent out;
and when the measured value is larger than or equal to the warning value, enhancing monitoring and giving an alarm, carrying out safety assessment again, adjusting the shield tunneling parameters and eliminating potential safety hazards.
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| CN114483068A (en) * | 2022-03-03 | 2022-05-13 | 北京市轨道交通建设管理有限公司 | Double-hole overlapping shield tunnel construction control method |
| CN117306610A (en) * | 2023-09-25 | 2023-12-29 | 中铁二十五局集团第一工程有限公司 | Mounting method of assembled retaining wall |
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