CN203443579U - Tunnel convergence monitoring system based on single side drift method - Google Patents

Tunnel convergence monitoring system based on single side drift method Download PDF

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Publication number
CN203443579U
CN203443579U CN201320547329.0U CN201320547329U CN203443579U CN 203443579 U CN203443579 U CN 203443579U CN 201320547329 U CN201320547329 U CN 201320547329U CN 203443579 U CN203443579 U CN 203443579U
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China
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tunnel
monitoring
convergence
measuring points
displacement
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胡旺
刘功大
刘超超
罗元元
郭乐
陈树芳
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Shanghai Civil Engineering Co Ltd of CREC
Municipal Environmental Protection Engineering Co Ltd of Shanghai Civil Engineering Co Ltd of CREC
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Shanghai Civil Engineering Co Ltd of CREC
Second Engineering Co Ltd of Shanghai Civil Engineering Co Ltd of CREC
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Abstract

The utility model relates to a tunnel convergence monitoring system, and in particular relates to a tunnel convergence monitoring system based on a single side drift method. The system is used for tunnel convergence monitoring. A middle partition wall is in a tunnel. Dug drift holes are on both sides of the middle partition wall. The system is characterized in that the monitoring system is composed of at least three displacement measurement points and convergence instruments; adjacent displacement measurement points are connected through a convergence instrument to form a displacement measurement line; and the displacement measurement points are located on a single side drift hole monitoring section. The monitoring system provided by the utility model has the advantages of simple structure, low cost and high measurement precision, can be applied to the tunnel which is dug through the single side drift method, and intuitively reflects the stability of surrounding rocks and a supporting structure of the tunnel through convergence measurement around the tunnel.

Description

A kind of convergence monitoring system based on single side heading method
Technical field
The utility model relates to convergence monitoring system, is specifically related to a kind of convergence monitoring system based on single side heading method.
Background technology
Single side heading method (CD) method is applicable in weak surrounding rock longspan tunnel, and the roughly step of the method is: a side in first partial excavation tunnel, and apply median septum, and then the opposite side in partial excavation tunnel; Remove afterwards median septum, build inverted arch, and lining cutting one-piece casting, constructing tunnel completed.
In the digging process in tunnel, the stability of country rock and supporting is most important, and the careless slightly tunnel that will occur collapses, the serious accident causing casualties.Therefore very important for the STABILITY MONITORING of tunnel surrounding and supporting, the convergence situation of tunnel perimeter can intuitively reflect the stability of tunnel surrounding and supporting construction, by perimeter convergence, measure, can provide foundation for tunnel surrounding and supporting construction stability analysis.
The method of tunnel deformation monitoring at present mainly contains: (1) carries out convergence monitoring by laser instrument and photosensitive displacement signal monitor are set on tunnel surrounding, owing to adopting single side heading method tunneling to have considerable influence for Tunnel Stability, and photosensitive displacement signal monitor need to be arranged on stabilizing surrounding rock, so this monitoring method not being suitable in the tunnel that adopts single side heading method excavation; (2) take the close shot deformation measurement that close shot video camera is major equipment, the apparatus expensive rapid wear that the method adopts, cannot be applicable to the tunnel in excavation; (3) take the 3 D deformation that total powerstation is major equipment measures, but total powerstation method is stable not for the physical state of reference point, cause that survey station point coordinate error is very large, and in observation process, do not carry out adjustment processing, so be greater than ± 1.0mm of the error of coordinate of observation station, can not meet accuracy requirement.
Given this, a kind of convergence monitoring system based on single side heading method is badly in need of in this area.
Summary of the invention
The purpose of this utility model is according to above-mentioned the deficiencies in the prior art part, a kind of convergence monitoring system based on single side heading method is provided, this monitoring system by arranging some displacement measuring points on the monitoring section in tunnel, between adjacent displacement measuring points, by convergence instrument, connect, to measure the relative displacement of the adjacent displacement measuring points line direction on tunnel monitoring section, to know the convergent deformation situation in tunnel.
The utility model object realizes and being completed by following technical scheme:
A kind of convergence monitoring system based on single side heading method, for convergence monitoring, described tunnel has a mid-board, the pilot tunnel of described mid-board both sides for having excavated, it is characterized in that described monitoring system consists of at least three displacement measuring points and convergence instrument, between adjacent described displacement measuring points, by described convergence instrument, connect to form displacement measurement line, described displacement measuring points is positioned on one-sided described pilot tunnel monitoring section.
Described displacement measuring points consists of the steel ring that embeds the deformed bar of described tunnel surrounding part and be arranged at described deformed bar end.
Three displacement measuring points particular locations in described at least three displacement measuring points are: one of them is arranged at the vault in described tunnel, on another two described tunnel sidewalls that are arranged at respectively same level height and on described mid-board.
Be arranged at the displacement measuring points of described tunnel vault apart from described mid-board 1~2m.
The 1.5m At The Height on Tunnel Design road surface described in the concrete span of described same level height.
The utility model has the advantages that, monitoring system is simple in structure, cost is lower, measuring accuracy is high, can be applicable in the tunnel of single side heading method excavation, the convergence by tunnel perimeter measures the stability that intuitively reflects tunnel surrounding and supporting construction, by calculating tunnel perimeter rate of convergence and predicting final mean annual increment movement value, for secondary lining, build and select the best opportunity, for constructing tunnel technique, support lining parameter optimization provide reference.
Accompanying drawing explanation
Fig. 1 is the layout schematic diagram of displacement measuring points in the utility model;
Fig. 2 is tunnel vault displacement~time curve schematic diagram in the utility model;
Fig. 3 is tunnel vault Displacement Development speed~time curve schematic diagram in the utility model.
Embodiment
Below in conjunction with accompanying drawing, by embodiment, feature of the present utility model and other correlated characteristic are described in further detail, so that technician's of the same trade understanding:
As Fig. 1-3, in figure, mark 1-8 is respectively: left side pilot tunnel 1, right side pilot tunnel 2, mid-board 3, displacement measuring points 4a, displacement measuring points 4b, displacement measuring points 5a, displacement measuring points 5b, displacement measuring points 6a, displacement measuring points 6b, displacement measurement line 7, design road surface 8.
Embodiment: as shown in Figure 1, the present embodiment is specifically related to a kind of convergence monitoring system based on single side heading method, adopt the roughly step of single side heading method tunneling to be: the left side pilot tunnel 1 in first partial excavation tunnel, and apply median septum 3, and then the right side pilot tunnel 2 in partial excavation tunnel.Based on above-mentioned tunnel structure, in order to monitor the convergent deformation in tunnel, monitoring section is set in tunnel, each monitoring section arranges a plurality of displacement measuring points at side wall respectively, utilize digital readout convergence instrument, adopt a common steel ruler being tightened up under weight effect as transmitting medium, by the display screen on digital readout convergence instrument, survey the variation of reading relative position between 2 of tunnel perimeters, and be recorded into Computer Database for analysis.
As shown in Figure 1, the a certain monitoring section of choosing in tunnel describes, displacement measuring points in it is arranged specific as follows: displacement measuring points 4a is laid in the vault place in the pilot tunnel 1 of left side, displacement measuring points 4b is laid in the vault place in right side pilot tunnel 2, and both are respectively in left and right side 1~2m place of vertical axis, tunnel; Displacement measuring points 5a is laid on the side wall of left side in pilot tunnel 1, and displacement measuring points 5b is laid on the side wall in right side pilot tunnel 2, and both are positioned at same level height, and between the design road surface 8 in tunnel at a distance of the height of 1.5m; Displacement measuring points 6a is laid on mid-board 3 and is positioned at Guide hole 1 one sides, and displacement measuring points 6b is laid on mid-board 3 and is positioned at right side pilot tunnel 2 one sides, and both are positioned at sustained height, and the same height at a distance of 1.5m between the design road surface 8 in tunnel.Between adjacent displacement measuring points by digital readout convergence instrument being set to form displacement measurement line 7, the two ends hook that is about to digital readout convergence instrument is buckled in respectively on adjacent displacement measuring points, so both can measure tunnel vault in the displacement situation of vertical direction, also can measure the horizontal shift situation between tunnel sidewalls and mid-board 3, be specially: the displacement measuring points 4a in left side pilot tunnel 1, displacement measuring points 5a, three digital display convergence instruments are set to form the displacement measurement line 7 of shape triangular in shape between displacement measuring points 6a, the displacement measuring points 4b of while in right side pilot tunnel 2, displacement measuring points 5b, three digital display convergence instruments are set to form the displacement measurement line 7 of same shape triangular in shape between displacement measuring points 6b.
Each above-mentioned displacement measuring points mainly comprises the deformed bar of embedding tunnel surrounding part and the steel ring that is arranged at deformed bar end, and steel ring can be circular, square or triangular construction, and it is mainly used in the hook of snapping digital readout convergence instrument.
The measurement frequency of this convergence monitoring system should be chosen according to velocity of displacement with apart from the distance of excavated surface, is specially:
1. when deformation velocity is more than or equal to 10mm/d and measuring section apart from the distance of excavated surface during for (0~1) B, the frequency of measurement is 1~2 times/day, and wherein d is chronomere sky, and B is tunnel width, lower with;
2. when deformation velocity is 5~10mm/d and measuring section apart from the distance of excavated surface during for (1~2) B, measuring frequency is 1 times/day;
3. when deformation velocity is 1~5mm/d and measuring section apart from the distance of excavated surface during for (2~5) B, measuring frequency is 1 time/2 days;
4. when deformation velocity be less than 1mm/d and measuring section apart from the distance of excavated surface when being greater than 5B, measuring frequency is 1 time/2 days;
When 5. the later stage measures, can be increased to interval time and measure once some months or half a year.
As shown in Figure 2,3, when above-mentioned convergence monitoring system completes after measurement, need to carry out Analysis on Results and information feedback to metric data:
(a), there are abnormal conditions in on-the-spot displacement calculating development increment after each observation, remeasures after getting rid of misoperation and report immediately relevant departments;
(b) after each survey time data, hand over data-processing operator to input computing machine, carry out the calculating of displacement increment, Displacement Development speed, draw displacement~time curve (as Fig. 2) and Displacement Development speed~time curve (as Fig. 3), and the method such as utility function matching and gray prediction is carried out, and Displacement Development is short, long-term forecasting;
(c) when tunnel periphery horizontal convergence speed and vault or base plate perpendicular displacement speed obviously decline, tunnel periphery horizontal convergence speed is less than 0.1mm/d~0.2mm/d, vault or base plate perpendicular displacement speed are less than 0.07mm/d~0.15mm/d, the every displacement in tunnel has reached estimates that 80%~90% above Shi,Xu Xiang relevant department of total amount reports and submits Second Lining Construction report.
The beneficial effect of the present embodiment is embodied in following 4 points:
1. periphery displacement is the most intuitively reaction that tunnel surrounding stress state changes, and the stability that measurement periphery displacement can be judgement tunnel space provides reliable information;
2. according to the degree of stability of displacement speed judgement tunnel surrounding, for secondary lining provides rational supporting time;
3. judge preliminary bracing design and construction: the rationality that method is chosen, in order to design and construction;
4. to surpassing, owe the amount of digging, measure, judge excavation quality, in order to guiding construction.

Claims (5)

1. the convergence monitoring system based on single side heading method, for convergence monitoring, described tunnel has a mid-board, the pilot tunnel of described mid-board both sides for having excavated, it is characterized in that described monitoring system consists of at least three displacement measuring points and convergence instrument, between adjacent described displacement measuring points, by described convergence instrument, connect to form displacement measurement line, described displacement measuring points is positioned on one-sided described pilot tunnel monitoring section.
2. a kind of convergence monitoring system based on single side heading method according to claim 1, is characterized in that described displacement measuring points consists of the steel ring that embeds the deformed bar of described tunnel surrounding part and be arranged at described deformed bar end.
3. a kind of convergence monitoring system based on single side heading method according to claim 1, three displacement measuring points particular locations described in it is characterized in that at least three displacement measuring points are: one of them is arranged at the vault in described tunnel, on another two described tunnel sidewalls that are arranged at respectively same level height and on described mid-board.
4. a kind of convergence monitoring system based on single side heading method according to claim 3, is characterized in that the displacement measuring points that is arranged at described tunnel vault is apart from described mid-board 1~2m.
5. a kind of convergence monitoring system based on single side heading method according to claim 3, is characterized in that the 1.5m At The Height on Tunnel Design road surface described in the concrete span of described same level height.
CN201320547329.0U 2013-09-05 2013-09-05 Tunnel convergence monitoring system based on single side drift method Active CN203443579U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104533520A (en) * 2014-12-01 2015-04-22 长沙理工大学 Tunnel arch crown settlement and peripheral convergence monitoring method
CN106050243A (en) * 2016-07-28 2016-10-26 中冶建工集团有限公司 Super-shallow-buried small-spacing large-section multi-tunnel concurrent construction method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104533520A (en) * 2014-12-01 2015-04-22 长沙理工大学 Tunnel arch crown settlement and peripheral convergence monitoring method
CN106050243A (en) * 2016-07-28 2016-10-26 中冶建工集团有限公司 Super-shallow-buried small-spacing large-section multi-tunnel concurrent construction method
CN106050243B (en) * 2016-07-28 2019-01-22 中冶建工集团有限公司 An ultra shallow buries the Multiple tunnel concurrent construction method of small spacing big cross section

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CP01 Change in the name or title of a patent holder

Address after: 200436 Shanghai, Zhabei District River Road, No. 272, No. three, layer 278, 10

Patentee after: Shanghai Civil Engineering Co., Ltd. of Crec

Patentee after: CRECSHANGHAI CIVIL ENGINEERING GROUP NO.2 ENGINEERING CO., LTD.

Address before: 200436 Shanghai, Zhabei District River Road, No. 272, No. three, layer 278, 10

Patentee before: Shanghai Civil Engineering Co., Ltd. of CREC

Patentee before: No.2 Engineering Company, Shanghai Civil Engineering Co., Ltd. of CREC

Address after: 200436 Shanghai, Zhabei District River Road, No. 272, No. three, layer 278, 10

Patentee after: Shanghai Civil Engineering Co., Ltd. of Crec

Patentee after: CRECSHANGHAI CIVIL ENGINEERING GROUP NO.2 ENGINEERING CO., LTD.

Address before: 200436 Shanghai, Zhabei District River Road, No. 272, No. three, layer 278, 10

Patentee before: Shanghai Civil Engineering Co., Ltd. of CREC

Patentee before: No.2 Engineering Company, Shanghai Civil Engineering Co., Ltd. of CREC

C56 Change in the name or address of the patentee

Owner name: SHANGHAI CIVIL ENGINEERING CO., LTD. OF CREC

Free format text: FORMER NAME: SHANGHAI CIVIL ENGINEERING CO., LTD. OF CREC

CP01 Change in the name or title of a patent holder

Address after: 200436, Zhabei District, Shanghai River Road, three, 272, 278, 10

Co-patentee after: China Railway Shanghai Engineering Bureau Group Municipal Environmental Protection Engineering Co.,Ltd.

Patentee after: SHANGHAI CIVIL ENGINEERING Co.,Ltd. OF CREC

Address before: 200436, Zhabei District, Shanghai River Road, three, 272, 278, 10

Co-patentee before: NO 2 ENGINEERING Co.,Ltd. SHANGHAI CIVIL ENGINEERING CO LTD OF CREC

Patentee before: SHANGHAI CIVIL ENGINEERING Co.,Ltd. OF CREC

CP01 Change in the name or title of a patent holder