CN114922632B - Method for detecting blocking reason and position of shield body of shield machine - Google Patents
Method for detecting blocking reason and position of shield body of shield machine Download PDFInfo
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- CN114922632B CN114922632B CN202210551423.7A CN202210551423A CN114922632B CN 114922632 B CN114922632 B CN 114922632B CN 202210551423 A CN202210551423 A CN 202210551423A CN 114922632 B CN114922632 B CN 114922632B
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- 230000000903 blocking effect Effects 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000001514 detection method Methods 0.000 claims abstract description 39
- 238000012360 testing method Methods 0.000 claims description 11
- 239000011435 rock Substances 0.000 claims description 7
- 238000004088 simulation Methods 0.000 claims description 7
- 230000007423 decrease Effects 0.000 claims description 6
- 230000035772 mutation Effects 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 description 9
- 230000006978 adaptation Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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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
- E21D9/0621—Shield advancing devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention provides a method for detecting the blocking reason and the position of a shield body of a shield machine, which relates to the detection field, and aims at detecting the strain of the inner wall of the shield body when the shield body of the shield machine is blocked.
Description
Technical Field
The invention relates to the field of detection, in particular to a method for detecting the blocking reason and the position of a shield body of a shield machine.
Background
The shield machine is used as large tunnel construction equipment, and has the advantages of high construction efficiency, good hole forming quality and small disturbance to the ground, and is widely applied to construction of urban subways, river crossing and sea crossing and water conservancy power tunnels. In the construction process, due to the working conditions of small hole diameter, surrounding rock convergence, bedrock protrusion, boulder and the like caused by severe cutter abrasion, the shield body of the shield machine is extremely easy to be blocked, and the shield machine is caused to be unable to advance. The common escape operation is to add an auxiliary oil cylinder to further increase the thrust of the shield machine; or according to the earth surface excavation, the rock stratum above the shield tunneling machine is emptied. However, in some cases, the addition of the auxiliary cylinder cannot achieve the escaping effect; moreover, as the shield machine is deeply buried underground, the building above the tunnel can influence the escaping construction; the construction difficulty of the shield body open hole inspection is high, only rock strata near the shield body can be clearly determined after the shield body is opened, and the blocking position cannot be determined. The open pore inspection not only affects the strength of the shield body, but also extremely easily affects the safety risk of constructors. This results in a shield seizing position determination and handling difficulties. Because accurate dead point blocking cannot be obtained, blind escape not only affects construction progress, but also causes serious problems such as shield deformation and the like, and threatens equipment and personnel safety. Therefore, a nondestructive testing method is urgently needed to be provided, the construction safety is ensured, meanwhile, the detection precision and efficiency are improved, and a guiding basis is provided for the escape operation after the shield body is blocked.
Disclosure of Invention
The invention provides a method for detecting the blocking reason and the position of a shield body of a shield machine, and aims to solve the problems in the prior art.
In order to achieve the above object, an embodiment of the present invention provides a method for detecting a cause and a position of a blocking of a shield body of a shield machine, including:
s1, carrying out patch on a plurality of detection points in a shield body of a shield machine, wherein the detection points comprise detection points at the front end of the shield body and detection points at the rear end of the shield body, and the testing direction of strain is along the axial direction of a tunnel;
s2, the strain gauges of all the measuring points are connected into a dynamic strain gauge, a pushing cylinder (5) of the shield machine is retracted and does not contact with the duct piece (7), and the acquired signals are zeroed;
s3, pushing the propulsion cylinder (5), and collecting strain data through a dynamic strain gauge at the same time, wherein the propulsion cylinder (5) is gradually loaded to the maximum thrust;
s4, after the strain data are stable, recording strain data values of all detection points, analyzing strain change rules of each point, preliminarily determining a clamping area, and according to the difference between the detection position and the clamping position, wherein the strain data comprise tensile strain data and compressive strain data;
s5, combining a shield body structure of the shield machine, establishing a finite element simulation model, applying constraint to the clamping area of the simulation model according to the preliminarily determined clamping area, applying load to the position of the thrust cylinder (5) to obtain a simulated strain result, and adjusting the load to enable the range of the simulated strain result to be consistent with the change trend of the test result;
s6, reducing the interval distance of the patches at the detection points, and repeating the steps s2-s5 until the detection area is smaller than the opening cleaning range.
Preferably, the detection point is far away from the support rib plate on the inner side of the shield body.
Preferably, the change rule in step s4 is as follows: comparing strain data of detection points at the front end of the shield body on the same circumference of the front end of the shield body, wherein the strain data show compressive strain, and if a compressive strain abrupt increase part appears, the blocking area is proved to exist on the front end shield body of the strain abrupt change position along the axial direction of the tunnel;
comparing the strain data of the detection points at the front end of the shield body on the same circumference of the rear end of the shield body, wherein the strain data shows tensile strain, and if a sudden increase part of the tensile strain occurs, the blocking area is indicated to exist on the rear end shield body of the strain mutation position along the axial direction of the tunnel;
preferably, when the seizing area appears at the front end of the shield body, comparing the compressive strain data in the axial direction of the same tunnel, and if the compressive strain decreases from large to small in the direction of the cutter head (1), the seizing position is between the maximum compressive strain and the direction of the cutter head (1); if the compressive strain increases from small to large in the direction of the cutter head (1), the clamping position is positioned between the position with the maximum compressive strain and the joint of the propulsion cylinder (5) and the shield body; if the middle compressive strain is larger, the clamping position is positioned near the maximum point of the compressive strain;
if the clamping area appears at the rear end of the shield body, comparing tensile strain data in the same tunnel axis direction, and if the tensile strain decreases from large to small from the joint of the propulsion cylinder (5) and the shield body to the tail end of the tail shield (6), the clamping position is positioned between the joint of the maximum strain and the propulsion cylinder (5); if the tensile strain increases from small to large from the joint of the propulsion cylinder (5) and the shield body to the tail end of the tail shield (6), the clamping position is positioned between the maximum tensile strain and the tail of the shield; if the intermediate value is larger, the clamping position is positioned near the maximum tensile strain point;
if the front end and the rear end of the shield body have strain mutation positions, the condition that the shield body is blocked is caused by factors such as bedrock protrusion or boulder and the like near the test position is indicated; if no strain abrupt change position appears at the front end and the rear end, the shield body is caused by the increase of shield body resistance due to the too small hole diameter or surrounding rock convergence.
The scheme of the invention has the following beneficial effects:
according to the method, when the shield body of the shield machine is blocked, strain detection is carried out on the inner wall of the shield body, the thrust cylinder is loaded to limit thrust, the change and distribution rule of the strain values of each region of the shield body are analyzed, the finite element analysis result is combined, and then the blocking reason and the blocking position of the shield body are determined.
Drawings
Fig. 1 is a schematic view of the patch location.
1. A cutterhead; 2. front shield; 4. middle shield; 5, pushing an oil cylinder; 6. tail shield; 7. a segment.
Detailed Description
In order to make the technical problems, technical solutions and advantages to be solved more apparent, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.
The shield body of the shield machine can be divided into a front shield 2, a middle shield 4 and a tail shield 6 from the cutter head 1, and a thrust cylinder 5 of the shield body is fixed at the middle shield 4. In the pushing process, the tail of the pushing cylinder 5 props against the side surface of the duct piece 7 to push the shield body to move forwards. When the front shield 2 and the shield body are blocked, the resistance formed at the blocked position prevents the advance of the propulsion cylinder 5, and the resistance born by the shield body and the thrust of the propulsion cylinder 5 are balanced. If the blocking point is at the front shield 2 or the middle shield 4, the shield body between the connecting part of the propulsion cylinder 5 and the middle shield 4 and the blocking point is compressed; if the dead point is at the tail shield 6, the shield body between the joint of the propulsion cylinder 5 and the middle shield 4 and the dead point will be pulled. When the shield body is pushed in, the stress of the shield body generates tiny strain, and the part with the most serious blocking point generates larger deformation, so that the blocking position can be accurately determined by carrying out strain test on the shield body and further analyzing the strain change rule.
As shown in fig. 1, an embodiment of the present invention provides a method for detecting a cause and a position of a blocking of a shield body of a shield machine, including the following steps
S1, carrying out patch on a plurality of detection points in a shield body of a shield machine, wherein the detection points comprise detection points at the front end of the shield body and detection points at the rear end of the shield body, and the testing direction of strain is along the axial direction of a tunnel;
s2, the strain gages of all the measuring points are connected into a dynamic strain gage, a thrust cylinder 5 of the shield machine is retracted and is not contacted with the duct piece 7, and the acquired signals are zeroed;
s3, pushing the propulsion cylinder 5, and collecting strain data through a dynamic strain gauge at the same time, wherein the propulsion cylinder 5 is gradually loaded to the maximum thrust;
s4, after the strain data are stable, recording strain data values of all detection points, analyzing strain change rules of each point, preliminarily determining a clamping area, and according to the difference between the detection position and the clamping position, wherein the strain data comprise tensile strain data and compressive strain data;
s5, combining a shield body structure of the shield machine, establishing a finite element simulation model, applying constraint to a clamping area of the simulation model, applying load to a thrust cylinder 5 to obtain a simulated strain result, and adjusting the load to enable the strain result range obtained by simulation to be consistent with the change trend of the test result;
s6, adjusting the interval distance of the patches at the plurality of detection points, and repeating the steps s2-s5 until the detection area is smaller than the opening cleaning range.
Further, when the detection points at the front end and the rear end of the shield body are determined, the support rib plates at the inner side of the shield body should be avoided, and interference of the support rib plates to strain tests is avoided.
In the present application, the standard determined in step s4 follows that deformation occurs at the front end or the rear end of the shield body first, and then the location of the seizing is determined. Specifically:
1. comparing the strain values of the detection points at the front end of the shield body on the same circumference, wherein the strain values represent compressive strain, and if obvious compressive strain abrupt increase positions appear, the blocking area is proved to exist on the front shield body at the strain abrupt change position along the axial direction of the tunnel.
When the clamping area appears at the front end of the shield body, comparing the compressive strain data in the axial direction of the same tunnel, and if the compressive strain decreases from large to small in the direction of the cutter head 1, positioning the clamping position between the maximum compressive strain and the direction of the cutter head 1; if the compressive strain increases from small to large in the direction of the cutter head 1, the clamping position is positioned between the position with the maximum compressive strain and the joint of the propulsion cylinder 5 and the shield body; if the middle compressive strain is larger, the clamping position is positioned near the maximum point of the compressive strain;
2. and comparing the strain data of the detection points at the front end of the shield body on the same circumference of the rear end of the shield body, wherein the strain data shows tensile strain, and if an obvious sudden increase part of the tensile strain occurs, the blocking area is indicated to exist on the rear end shield body of the strain mutation position along the axial direction of the tunnel.
The blocking area is formed at the rear end of the shield body, tensile strain data in the same tunnel axis direction are compared, and if the tensile strain decreases from large to small from the joint of the propulsion cylinder 5 and the shield body to the tail end of the tail shield 6, the blocking position is located between the joint of the maximum strain and the propulsion cylinder 5; if the tensile strain increases from small to large from the joint of the propulsion cylinder 5 and the shield body to the tail end of the tail shield 6, the clamping position is positioned between the maximum strain position and the shield tail; if the intermediate value is larger, the clamping position is positioned near the maximum strain point;
3. if the front end and the rear end of the shield body have strain mutation positions, the condition that the shield body is blocked is caused by factors such as bedrock protrusion or boulder and the like near the test position is indicated;
4. if the front end and the rear end of the shield body are not provided with the strain abrupt change positions, the shield body is caused by the increase of the resistance of the shield body due to the too small hole diameter or the convergence of surrounding rock.
The application provides a nondestructive detection mode, can fix a position the dead position of card of shield machine shield body and the dead reason of card fast, reduced construction cost, improve detection efficiency and accuracy, can provide reliable basis for subsequent treatment of getting rid of poverty.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.
Claims (2)
1. A method for detecting the blocking reason and the position of a shield body of a shield machine is characterized by comprising the following steps:
s1, carrying out patch on a plurality of detection points in a shield body of a shield machine, wherein the detection points comprise detection points at the front end of the shield body and detection points at the rear end of the shield body, and the testing direction of strain is along the axial direction of a tunnel;
s2, the strain gauges of all the measuring points are connected into a dynamic strain gauge, a pushing cylinder (5) of the shield machine is retracted and does not contact with the duct piece (7), and the acquired signals are zeroed;
s3, pushing the propulsion cylinder (5), and collecting strain data through a dynamic strain gauge at the same time, wherein the propulsion cylinder (5) is gradually loaded to the maximum thrust;
s4, after the strain data are stable, recording strain data values of all detection points, analyzing strain change rules of each point, preliminarily determining a clamping area, and according to the difference between the detection position and the clamping position, wherein the strain data comprise tensile strain data and compressive strain data;
s5, combining a shield body structure of the shield machine, establishing a finite element simulation model, applying constraint to the clamping area of the simulation model according to the preliminarily determined clamping area, applying load to the position of the thrust cylinder (5) to obtain a simulated strain result, and adjusting the load to enable the range of the simulated strain result to be consistent with the change trend of the test result;
s6, reducing the interval distance of the patches at the detection points, and repeating the steps s2-s5 until the detection area is smaller than the opening cleaning range;
the detection point is far away from the support rib plate on the inner side of the shield body;
the change rule in the step s4 is as follows: comparing strain data of detection points at the front end of the shield body on the same circumference of the front end of the shield body, wherein the strain data show compressive strain, and if a compressive strain abrupt increase part appears, the blocking area is proved to exist on the front end shield body of the strain abrupt change position along the axial direction of the tunnel;
and comparing the strain data of the detection points at the front end of the shield body on the same circumference of the rear end of the shield body, wherein the strain data shows tensile strain, and if a sudden increase part of the tensile strain occurs, the blocking area is indicated to exist on the rear end shield body of the strain abrupt change position along the axial direction of the tunnel.
2. The method for detecting the blocking reason and the position of the shield body of the shield machine according to claim 1, wherein the method comprises the following steps: when the clamping area appears at the front end of the shield body, comparing the compressive strain data in the axial direction of the same tunnel, and if the compressive strain decreases from large to small in the direction of the cutter head (1), positioning the clamping position between the maximum compressive strain and the direction of the cutter head (1); if the compressive strain increases from small to large in the direction of the cutter head (1), the clamping position is positioned between the position with the maximum compressive strain and the joint of the propulsion cylinder (5) and the shield body; if the middle compressive strain is larger, the clamping position is positioned near the maximum point of the compressive strain;
if the clamping area appears at the rear end of the shield body, comparing tensile strain data in the same tunnel axis direction, and if the tensile strain decreases from large to small from the joint of the propulsion cylinder (5) and the shield body to the tail end of the tail shield (6), the clamping position is positioned between the joint of the maximum strain and the propulsion cylinder (5); if the tensile strain increases from small to large from the joint of the propulsion cylinder (5) and the shield body to the tail end of the tail shield (6), the clamping position is positioned between the maximum tensile strain and the tail of the shield; if the intermediate value is larger, the clamping position is positioned near the maximum tensile strain point;
if the front end and the rear end of the shield body have strain mutation positions, the condition that the shield body is blocked is caused by foundation rock protrusion or boulder factors near the test position is indicated; if no strain abrupt change position appears at the front end and the rear end, the shield body is caused by the increase of shield body resistance due to the too small hole diameter or surrounding rock convergence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210551423.7A CN114922632B (en) | 2022-05-20 | 2022-05-20 | Method for detecting blocking reason and position of shield body of shield machine |
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| CN202210551423.7A CN114922632B (en) | 2022-05-20 | 2022-05-20 | Method for detecting blocking reason and position of shield body of shield machine |
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| CN114922632A CN114922632A (en) | 2022-08-19 |
| CN114922632B true CN114922632B (en) | 2023-05-12 |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2185058C (en) * | 1996-09-09 | 2008-12-30 | Tony Dimillo | Tunnel boring machine |
| CN207879337U (en) * | 2018-02-24 | 2018-09-18 | 黄河勘测规划设计有限公司 | The shield formula TBM of system is monitored with country rock convergent deformation |
| CN109253711B (en) * | 2018-10-17 | 2020-07-10 | 中南大学 | Method for detecting clamping position of spiral conveyor of earth pressure balance shield machine |
| CN111636876B (en) * | 2020-04-21 | 2021-09-07 | 中南大学 | Method for detecting stress of key position of shield body of large-diameter shield machine |
| CN111963180A (en) * | 2020-09-09 | 2020-11-20 | 中交天和机械设备制造有限公司 | Shield constructs quick-witted area pressure cutter detecting system |
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