CN102620661A - Tunnel settlement convergence detector and tunnel settlement convergence detection method - Google Patents
Tunnel settlement convergence detector and tunnel settlement convergence detection method Download PDFInfo
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Abstract
The invention relates to a tunnel settlement convergence detector and a tunnel settlement convergence detection method. The detector comprises a detector main body, wherein a measuring device which is driven by a servo motor to rotate is arranged on the detector main body; the measuring device comprises a carrier; the carrier is connected to the detector main body through a rotary shaft; the rotary shaft is connected with an angle coder; and a laser interference distance meter and a gravity induction sensor with a level zero-degree output signal are arranged on the carrier. The method comprises the steps of original data detection and settlement convergence detection. The invention is simple in structure, convenient to operate, high in accuracy and high in stability, quick detection can be realized, one-time detection can be finished by only one person within a few minutes, time-saving and labor-saving effects are achieved, and the invention has an obvious technical progress; and meanwhile, the detection does not conflict with other engineering construction, all-weather real-time monitoring can be performed by using application software, and large settlement and instable settlement of a tunnel are early warned.
Description
Technical field
The invention belongs to field of measuring technique, particularly a kind of tunnel subsidence convergence detection appearance and detection method thereof, the Combination application through laser interference distance measuring equipment and gravity sensing device has realized tunnel subsidence convergent fast detecting.
Background technology
Tunnel clearance is very crucial controlling factor in constructing tunnel, in excavation control, the size of tunnel clearance have influence on out break side's amount what also two later lining thickness are produced very large influence simultaneously; Whether the section headroom in the tunnel after in two linings, being directly connected to moulding invades limit.Therefore, the sedimentation in tunnel convergence is indispensable detection, and it can make judgement to the tunnel degree of stability, and the unsafe factor in early warning tunnel prevents the generation of accident.At present, detection method is " the spirit-leveling instrument method of falling the chi ", and it has than higher precision, but operation is more loaded down with trivial details, need be at the tunnel top built-in fitting; General more dim in the tunnel, influence the reading accuracy of levelling pole; Go out the work that can cause in the dregs process each other in the tunnel and incur loss through delay, waste time and energy in this way.
Summary of the invention
The objective of the invention is to propose a kind of tunnel subsidence convergence detection appearance and detection method technical scheme thereof, this technical scheme has realized tunnel subsidence convergent fast detecting through the Combination application of laser interference distance measuring equipment and gravity sensing device.
To achieve these goals, technical scheme of the present invention is:
A kind of tunnel subsidence convergence detection appearance; Comprise the detector main body; The detector main body is provided with a measurement mechanism by the servo motor driven rotation; Said measurement mechanism comprises a carrier, and said carrier is connected on the detector main body through turning axle, and said turning axle is connected with angular encoder; Said carrier is provided with the gravity sensing sensor that a laser interference stadimeter and have horizontal zero degree output signal, the laser beam axis that the sensitive axes of said gravity sensing sensor and said laser interference stadimeter send axial consistent; Said detector main body is provided with microprocessor measuring and controlling, temperature sensor, humidity sensor and surveyor's staff; Said surveyor's staff is axially spent the angle settings with the laser beam axis that said laser interference stadimeter sends to being 90, and the output signal of said angular encoder, laser interference stadimeter, gravity sensing sensor, temperature sensor, humidity sensor is connected to the microprocessor measuring and controlling respectively.
Said surveyor's staff is the range estimation level tube.
A kind of tunnel subsidence convergence detection method; Said method is based on a kind of tunnel subsidence convergence detection appearance and the detection method that realizes; Said tunnel subsidence convergence detection appearance comprises the detector main body; The detector main body is provided with a measurement mechanism by the servo motor driven rotation; Said measurement mechanism comprises a carrier, and said carrier is connected on the detector main body through turning axle, and said turning axle is connected with angular encoder; Said carrier is provided with the gravity sensing sensor that a laser interference stadimeter and have horizontal zero degree output signal, the laser beam axis that the sensitive axes of said gravity sensing sensor and said laser interference stadimeter send axial consistent; Said detector main body is provided with microprocessor measuring and controlling, temperature sensor, humidity sensor and surveyor's staff; Said surveyor's staff is axially spent the angle settings with the laser beam axis that said laser interference stadimeter sends to being 90, and the output signal of said angular encoder, laser interference stadimeter, gravity sensing sensor, temperature sensor, humidity sensor is connected to the microprocessor measuring and controlling respectively; The step of said tunnel subsidence convergence detection method comprises that raw data detects step and sedimentation convergence detection step:
Said raw data detects step and comprises:
A. at first said tunnel subsidence convergence detection appearance is fixed on a side wall place in tunnel and writes down fixed origin;
B. with the opposite side abutment wall of laser interference stadimeter towards the tunnel, the calibrated horizontal chi makes the detector turning axle be in horizontality;
C. start the work of tunnel subsidence convergence detection appearance: the microprocessor measuring and controlling is sent the servo motor startup command; Servo motor drives measurement mechanism and begins rotation, and the microprocessor measuring and controlling is waited for the horizontal zero degree output signal that the gravity sensing sensor sends;
D. after the microprocessor measuring and controlling receives the horizontal zero degree output signal that the gravity sensing sensor sends; The range data that record laser interference stadimeter at this moment records is tunnel first width distance, and the angle of definition angular encoder this moment output is the zero angle signal; Continue to rotate up measurement mechanism and read the oblique distance of laser interference stadimeter to tunnel top; The definition top is a point arbitrarily; Read the oblique distance of laser interference stadimeter to the said point arbitrarily of tunnel top; The angle of record angular encoder output at this moment; Calculating the said any point of tunnel top through sine is tunnel first vertical height to the horizontal vertical height of laser interference stadimeter, calculates the vertical some distance of laser interference stadimeter to tunnel first vertical height described in the tunnel width distance;
Said sedimentation convergence detection step comprises to be obtained tunnel width convergence result step and obtains tunnel height convergence result step:
The said tunnel width convergence result step of obtaining is:
E. said tunnel subsidence convergence detection appearance is fixed on the fixed origin place that the side wall in tunnel is write down, said fixed origin is the fixed origin that said raw data detects tunnel subsidence convergence detection appearance in the step;
F. with the opposite side abutment wall of laser interference stadimeter towards the tunnel, the calibrated horizontal chi makes the detector turning axle be in horizontality;
G. start the work of tunnel subsidence convergence detection appearance: the microprocessor measuring and controlling is sent the servo motor startup command; Servo motor drives measurement mechanism and begins rotation, and the microprocessor measuring and controlling is waited for the horizontal zero degree output signal that the gravity sensing sensor sends; After the microprocessor measuring and controlling receives the horizontal zero degree output signal that the gravity sensing sensor sends; The range data that record laser interference stadimeter at this moment records is tunnel second width distance; And the angle of definition angular encoder this moment output is the zero angle signal; Tunnel first width distance and tunnel second width distance are subtracted each other, obtain tunnel width convergence result;
The convergence of both sides abutment wall is symmetrical in the tunnel width convergence; Therefore the vertical point of tunnel first vertical height described in the raw data detection step is a known distance to the distance of current laser interference stadimeter, and its computation process is: the vertical distance that raw data detects laser interference stadimeter first vertical height to said tunnel described in the step deducts 1/2nd width convergence distances;
The said tunnel height convergence result step of obtaining is:
H. continue to rotate up measurement mechanism and read the oblique distance of laser interference stadimeter to tunnel top; According to the vertical point of known tunnel first vertical height oblique distance to the angle of the distance of current laser interference stadimeter, the angular encoder output of reading continuously and the laser interference stadimeter that reads continuously to tunnel top; Find the said top point arbitrarily on said vertical point through the cosine law; Calculate the said any point of tunnel top this moment to the horizontal vertical height of laser interference stadimeter through sine or Pythagorean theorem; And be referred to as tunnel second vertical height; Tunnel first vertical height and tunnel second vertical height are subtracted each other, obtain tunnel height convergence result.
The present invention is compared with prior art: simple in structure, easy to operate, precision is high, good stability, can realize fast detecting; Accomplish one-time detection use other method more than one hour, need two people at least, and use this method only to need a people, only need a few minutes, time saving and energy saving, have tangible technical progress; Do not conflict in the testing process simultaneously, mix application software and can carry out the all-weather real-time monitoring, have big sedimentation, unstable sedimentation to carry out early warning the tunnel with the Other Engineering construction.
Below in conjunction with accompanying drawing and embodiment the present invention is made a detailed description.
Description of drawings
Fig. 1 is a tunnel subsidence convergence detection appearance profile synoptic diagram of the present invention;
Fig. 2 is a tunnel subsidence convergence detection appearance structural representation of the present invention;
Fig. 3 is a tunnel subsidence convergence detection instrument circuit block diagram of the present invention;
Fig. 4 is a measuring process synoptic diagram of the present invention.
Embodiment
Embodiment 1:
A kind of tunnel subsidence convergence detection appearance; Referring to Fig. 1, Fig. 2 and Fig. 3; Said tunnel subsidence convergence detection appearance comprises detector main body 1, and the detector main body is provided with a measurement mechanism by servo motor 2 driven in rotation, and said measurement mechanism comprises a carrier 3; Said carrier is connected on the detector main body through turning axle 4; Said turning axle is connected with angular encoder 5, and said carrier is provided with the gravity sensing sensor 7 that a laser interference stadimeter 6 and have horizontal zero degree output signal, the laser beam axis that the sensitive axes of said gravity sensing sensor and said laser interference stadimeter send axial consistent; Said detector main body is provided with microprocessor measuring and controlling 8, temperature sensor 9, humidity sensor 10 and surveyor's staff 11; Said surveyor's staff is axially spent the angle settings with the laser beam axis that said laser interference stadimeter sends to being 90; Said angular encoder, laser interference stadimeter, gravity sensing sensor, the output signal of temperature sensor, humidity sensor is connected to the microprocessor measuring and controlling respectively.Wherein said surveyor's staff is the range estimation level tube, and said servo motor is driven through driving circuit 12 by microprocessor.
Detector main body among the embodiment can conveniently be designed to multiple shape according to in-site measurement; Present embodiment is considered on-the-spot hand-held convenient; Said detector main body includes a U-shaped framework 1-1; The limit of sealing at the U-shaped framework is provided with the hand-held handle 1-2 of a convenience, and the power-supply battery of this instrument can be installed in the handle, is provided with a conehead 12 that is used to locate initial point in the outer end of handle.Utilize this conehead when measuring, can this conehead be snapped in the body of wall of tunnel one side, promptly can locate initial point, can play the effect of stable detection appearance main body again.
The measuring and controlling of microprocessor described in the embodiment includes a microprocessor 8-1, and the microprocessor data mouth connects several button 8-2 that are used to operate, and the microprocessor data mouth also connects the display 8-3 that is used for video data; Temperature sensor wherein and humidity sensor are the adjustments of data that is used for the laser interference stadimeter, and described laser interference stadimeter is the matured product of buying on the market.
Embodiment 2:
A kind of tunnel subsidence convergence detection method; Said method is based on embodiment 1 one kinds of tunnel subsidence convergence detection appearance and the detection method that realizes; Embodiment 1 said tunnel subsidence convergence detection appearance comprises the detector main body; The detector main body is provided with a measurement mechanism by the servo motor driven rotation; Said measurement mechanism comprises a carrier, and said carrier is connected on the detector main body through turning axle, and said turning axle is connected with angular encoder; Said carrier is provided with the gravity sensing sensor that a laser interference stadimeter and have horizontal zero degree output signal, the laser beam axis that the sensitive axes of said gravity sensing sensor and said laser interference stadimeter send axial consistent; Said detector main body is provided with microprocessor measuring and controlling, temperature sensor, humidity sensor and surveyor's staff; Said surveyor's staff is axially spent the angle settings with the laser beam axis that said laser interference stadimeter sends to being 90; Said angular encoder, laser interference stadimeter, gravity sensing sensor, the output signal of temperature sensor, humidity sensor is connected to the microprocessor measuring and controlling respectively; The step of said tunnel subsidence convergence detection method comprises that raw data detects step and sedimentation convergence detection step:
Said raw data detects step and comprises:
A. at first said tunnel subsidence convergence detection appearance is fixed on a side wall place in tunnel and writes down fixed origin;
B. with the opposite side abutment wall of laser interference stadimeter towards the tunnel, the calibrated horizontal chi makes the detector turning axle be in horizontality;
C. start the work of tunnel subsidence convergence detection appearance: the microprocessor measuring and controlling is sent the servo motor startup command; Servo motor drives measurement mechanism and begins rotation, and the microprocessor measuring and controlling is waited for the horizontal zero degree output signal that the gravity sensing sensor sends;
D. after the microprocessor measuring and controlling receives the horizontal zero degree output signal that the gravity sensing sensor sends; The range data that record laser interference stadimeter at this moment records is tunnel first width distance, and the angle of definition angular encoder this moment output is the zero angle signal; Continue to rotate up measurement mechanism and read the oblique distance of laser interference stadimeter to tunnel top; The definition top is a point arbitrarily; Read the oblique distance of laser interference stadimeter to the said point arbitrarily of tunnel top; The angle of record angular encoder output at this moment; Calculating the said any point of tunnel top through sine is tunnel first vertical height to the horizontal vertical height of laser interference stadimeter, calculates the vertical some distance of laser interference stadimeter to tunnel first vertical height described in the tunnel width distance;
Said sedimentation convergence detection step comprises to be obtained tunnel width convergence result step and obtains tunnel height convergence result step:
The said tunnel width convergence result step of obtaining is:
E. said tunnel subsidence convergence detection appearance is fixed on the fixed origin place that the side wall in tunnel is write down, said fixed origin is the fixed origin that said raw data detects tunnel subsidence convergence detection appearance in the step;
F. with the opposite side abutment wall of laser interference stadimeter towards the tunnel, the calibrated horizontal chi makes the detector turning axle be in horizontality;
G. start the work of tunnel subsidence convergence detection appearance: the microprocessor measuring and controlling is sent the servo motor startup command; Servo motor drives measurement mechanism and begins rotation, and the microprocessor measuring and controlling is waited for the horizontal zero degree output signal that the gravity sensing sensor sends; After the microprocessor measuring and controlling receives the horizontal zero degree output signal that the gravity sensing sensor sends; The range data that record laser interference stadimeter at this moment records is tunnel second width distance; And the angle of definition angular encoder this moment output is the zero angle signal; Tunnel first width distance and tunnel second width distance are subtracted each other, obtain tunnel width convergence result;
The convergence of both sides abutment wall is symmetrical in the tunnel width convergence; Therefore the vertical point of tunnel first vertical height described in the raw data detection step is a known distance to the distance of current laser interference stadimeter, and its computation process is: the vertical distance that raw data detects laser interference stadimeter first vertical height to said tunnel described in the step deducts 1/2nd width convergence distances;
The said tunnel height convergence result step of obtaining is:
H. continue to rotate up measurement mechanism and read the oblique distance of laser interference stadimeter to tunnel top; According to the vertical point of known tunnel first vertical height oblique distance to the angle of the distance of current laser interference stadimeter, the angular encoder output of reading continuously and the laser interference stadimeter that reads continuously to tunnel top; Find the said top point arbitrarily on said vertical point through the cosine law; Calculate the said any point of tunnel top this moment to the horizontal vertical height of laser interference stadimeter through sine or Pythagorean theorem; And be referred to as tunnel second vertical height; Tunnel first vertical height and tunnel second vertical height are subtracted each other, obtain tunnel height convergence result.
The range data of laser interference stadimeter is the data after proofreading and correct through scene temperature, humidity among the embodiment, and its distance-finding method is a kind of known method.
Fig. 4 is to the signal of the image of on-the-spot tunnel convergence measurement, specifically describes as follows:
Side amount data are for the first time: the A of abutment wall place that is placed in instrument O in the tunnel; Adjustment instrument direction makes the surveyor's staff level tube bubble placed in the middle, and (＜CAB) back startup measurement maybe need not be imported the angle microprocessor and directly send the measurement instruction can to set rotational angle after the start earlier; Microprocessor drives measurement mechanism through the driving circuit drives servo motor and rotates; The horizontal situation of gravity sensing sensor monitors measurement mechanism, when the measurement mechanism level, the gravity sensing sensor sends measurement mechanism at horizontal signal to microprocessor; Microprocessor activates the work of laser interference distance measuring equipment; The laser interference distance measuring equipment is measured the A point to along horizontal direction B point distance A B, and the microprocessor records data finally obtain AB distance value data and store according to the data of weather station (temperature sensor, humidity sensor) after overcorrect; Servo motor continues to drive measurement mechanism and rotates; When the angle of angular encoder output and start setting rotational angle (＜when CAB) identical; Microprocessor makes servo motor stop operating after receiving this angle-data; The laser interference distance measuring equipment is measured the A point to C point distance A C, and microprocessor records AC range data finally obtains AC distance value data and stores according to the data of weather station after overcorrect.Directly send the measurement instruction mode if need not import angle in advance: the servo motor driven measurement mechanism rotates; The horizontal situation of gravity sensing sensor monitors measurement mechanism; When the measurement mechanism level; The gravity sensing sensor sends trigger pip to microprocessor, and microprocessor receives and activate the laser interference distance measuring equipment behind the signal, and the laser interference distance measuring equipment is measured the A point to along horizontal direction B point distance A B; The microprocessor records data finally obtain AB range data value and storage according to the data of weather station after overcorrect; Servo motor continues to drive measurement mechanism and rotates; The back definition top that rotates to an angle is pressed control knob more arbitrarily it is stopped operating; The laser interference distance measuring equipment is measured A point C point distance A C, and the microprocessor records data finally obtain AC distance value data according to the data of weather station and also store after overcorrect; The angular encoder output angle that measurement mechanism turned over (＜CAB), microprocessor records storage range data and angle-data.
Use following formula according to these data:
Tunnel top is the height CD=AC * sinCAB of any arbitrarily;
Calculate the laser interference distance measuring equipment to any any the distance A D of intersection point point of height of tunnel top;
AD=AC×cosCAB；
The sedimentation convergence detection is: be placed on instrument on the location point of measuring for the first time, adjustment instrument direction makes level tube bubble placed in the middle, and microprocessor sends measures instruction; The servo motor driven measurement mechanism rotates; The horizontal situation of gravity sensing device monitoring measurement mechanism, when the measurement mechanism level, the gravity sensing sensor sends trigger pip to microprocessor; Microprocessor activates the laser interference distance measuring equipment; The laser interference distance measuring equipment is measured A ' and is put along horizontal direction B ' some distance A ' B ', the microprocessor records data finally obtain A ' B ' distance value data and storage according to the data of weather station after overcorrect; Calculate width convergence data and calculate the distance that A ' puts D; Servo motor continues to drive measurement mechanism and rotates; When angular encoder output angle near exported last time angle (＜CAB) time; Instrument gets into the fine setting state, and the measurement mechanism slow rotation is constantly adjusted angular encoder output angle laser ranging system continuous coverage A ' according to the distance of known A ' D and put the distance that put at the top; Angular encoder is uninterruptedly exported angle value, and microprocessor records is handled these data until distance=A ' of A ' D C ' * cosC ' A ' B '.
Then C ' is the settlement point of C, calculates height C ' D=A ' C ' * sinC ' A ' B ' of this moment;
The prerequisite of The above results be two abutment wall convergency value approximately equals (actual result also be approximately equal) promptly:
AA’=BB’
Can get convergency value
AA’=(AB-A’B’)/2;
Again
A’D=AD-AA’
Therefore with the sedimentation value that measures for the second time be for the first time:
CC’=CD-C’D；
The sedimentation convergency value that three observation, four observations etc. are repeatedly observed and the like, its mathematic(al) representation is:
E=Ne-(N-1)e；
F=Nf-(N-1)f；
E represents the sedimentation convergency value,
Tunnel top was to the vertical range of instrument when Ne represented and detects for the n time,
(N-1) e the n-1 time detects the vertical range of interval scale tunnel top to instrument,
F represents the width convergency value,
Instrument was to the horizontal range of abutment wall when Nf represented and detects for the n time,
Instrument was to the horizontal range of abutment wall when (N-1) f represented the n-1 time detection.
Claims (3)
1. tunnel subsidence convergence detection appearance; Comprise the detector main body; It is characterized in that the detector main body is provided with a measurement mechanism by the servo motor driven rotation, said measurement mechanism comprises a carrier; Said carrier is connected on the detector main body through turning axle; Said turning axle is connected with angular encoder, and said carrier is provided with the gravity sensing sensor that a laser interference stadimeter and have horizontal zero degree output signal, the laser beam axis that the sensitive axes of said gravity sensing sensor and said laser interference stadimeter send axial consistent; Said detector main body is provided with microprocessor measuring and controlling, temperature sensor, humidity sensor and surveyor's staff; Said surveyor's staff is axially spent the angle settings with the laser beam axis that said laser interference stadimeter sends to being 90, and the output signal of said angular encoder, laser interference stadimeter, gravity sensing sensor, temperature sensor, humidity sensor is connected to the microprocessor measuring and controlling respectively.
2. a kind of tunnel subsidence convergence detection appearance according to claim 1 is characterized in that, said surveyor's staff is the range estimation level tube.
3. tunnel subsidence convergence detection method; It is characterized in that; Said method is based on a kind of tunnel subsidence convergence detection appearance and the detection method that realizes; Said tunnel subsidence convergence detection appearance comprises the detector main body, and the detector main body is provided with a measurement mechanism by the servo motor driven rotation, and said measurement mechanism comprises a carrier; Said carrier is connected on the detector main body through turning axle; Said turning axle is connected with angular encoder, and said carrier is provided with the gravity sensing sensor that a laser interference stadimeter and have horizontal zero degree output signal, the laser beam axis that the sensitive axes of said gravity sensing sensor and said laser interference stadimeter send axial consistent; Said detector main body is provided with microprocessor measuring and controlling, temperature sensor, humidity sensor and surveyor's staff; Said surveyor's staff is axially spent the angle settings with the laser beam axis that said laser interference stadimeter sends to being 90, and the output signal of said angular encoder, laser interference stadimeter, gravity sensing sensor, temperature sensor, humidity sensor is connected to the microprocessor measuring and controlling respectively; The step of said tunnel subsidence convergence detection method comprises that raw data detects step and sedimentation convergence detection step:
Said raw data detects step and comprises:
A. at first said tunnel subsidence convergence detection appearance is fixed on a side wall place in tunnel and writes down fixed origin;
B. with the opposite side abutment wall of laser interference stadimeter towards the tunnel, the calibrated horizontal chi makes the detector turning axle be in horizontality;
C. start the work of tunnel subsidence convergence detection appearance: the microprocessor measuring and controlling is sent the servo motor startup command; Servo motor drives measurement mechanism and begins rotation, and the microprocessor measuring and controlling is waited for the horizontal zero degree output signal that the gravity sensing sensor sends;
D. after the microprocessor measuring and controlling receives the horizontal zero degree output signal that the gravity sensing sensor sends; The range data that record laser interference stadimeter at this moment records is tunnel first width distance, and the angle of definition angular encoder this moment output is the zero angle signal; Continue to rotate up measurement mechanism and read the oblique distance of laser interference stadimeter to tunnel top; The definition top is a point arbitrarily; Read the oblique distance of laser interference stadimeter to the said point arbitrarily of tunnel top; The angle of record angular encoder output at this moment; Calculating the said any point of tunnel top through sine is tunnel first vertical height to the horizontal vertical height of laser interference stadimeter, calculates the vertical some distance of laser interference stadimeter to tunnel first vertical height described in the tunnel width distance;
Said sedimentation convergence detection step comprises to be obtained tunnel width convergence result step and obtains tunnel height convergence result step:
The said tunnel width convergence result step of obtaining is:
E. said tunnel subsidence convergence detection appearance is fixed on the fixed origin place that the side wall in tunnel is write down, said fixed origin is the fixed origin that said raw data detects tunnel subsidence convergence detection appearance in the step;
F. with the opposite side abutment wall of laser interference stadimeter towards the tunnel, the calibrated horizontal chi makes the detector turning axle be in horizontality;
G. start the work of tunnel subsidence convergence detection appearance: the microprocessor measuring and controlling is sent the servo motor startup command; Servo motor drives measurement mechanism and begins rotation, and the microprocessor measuring and controlling is waited for the horizontal zero degree output signal that the gravity sensing sensor sends; After the microprocessor measuring and controlling receives the horizontal zero degree output signal that the gravity sensing sensor sends; The range data that record laser interference stadimeter at this moment records is tunnel second width distance; And the angle of definition angular encoder this moment output is the zero angle signal; Tunnel first width distance and tunnel second width distance are subtracted each other, obtain tunnel width convergence result;
The convergence of both sides abutment wall is symmetrical in the tunnel width convergence; Therefore the vertical point of tunnel first vertical height described in the raw data detection step is a known distance to the distance of current laser interference stadimeter, and its computation process is: the vertical distance that raw data detects laser interference stadimeter first vertical height to said tunnel described in the step deducts 1/2nd width convergence distances;
The said tunnel height convergence result step of obtaining is:
H. continue to rotate up measurement mechanism and read the oblique distance of laser interference stadimeter to tunnel top; According to the vertical point of known tunnel first vertical height oblique distance to the angle of the distance of current laser interference stadimeter, the angular encoder output of reading continuously and the laser interference stadimeter that reads continuously to tunnel top; Find the said top point arbitrarily on said vertical point through the cosine law; Calculate the said any point of tunnel top this moment to the horizontal vertical height of laser interference stadimeter through sine or Pythagorean theorem; And be referred to as tunnel second vertical height; Tunnel first vertical height and tunnel second vertical height are subtracted each other, obtain tunnel height convergence result.
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