CN114396915B - Underground electric power tunnel engineering elevation measurement method - Google Patents
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- G01C5/00—Measuring height; Measuring distances transverse to line of sight; Levelling between separated points; Surveyors' levels
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Abstract
The invention discloses an underground electric power tunnel engineering elevation measurement method, which comprises the steps of firstly, arranging wellhead elevation points at a shaft mouth, and carrying out level joint measurement with the ground known elevation points; then erecting a level gauge with a horizontally extending bracket on a height measuring point of a shaft mouth, and utilizing a hanging steel rule to carry out the inner and outer heights Cheng Chuandi of the tunnel of the elevation so as to obtain accurate calculation data of the elevation in the electric power tunnel; the invention relates to a method for measuring the height of a traditional level and a wire in a tunnel, which comprises the steps of arranging N tunnel elevation points in the tunnel, arranging level pipes, utilizing a communicating vessel principle, fixing vertical level pipes on each tunnel elevation point, tightly sealing and connecting every two adjacent level pipes by using a communicating water pipe, calculating the height difference between the Gao Chengdian level pipes and the level pipes by means of a hanging steel ruler and a right-angle triangular ruler, calculating the height difference between the two tunnel elevation points according to the same height of the level pipes communicated with the two adjacent tunnel elevation points, and sequentially accumulating and calculating to obtain the elevation value of each tunnel elevation point.
Description
Technical Field
The invention relates to the application field of underground power cable and municipal tunnel project elevation measurement and vertical displacement monitoring, in particular to an underground power tunnel project elevation measurement method.
Background
An underground power cable tunnel is a corridor or tunnel structure that can accommodate a large number of cables laid on cable supports, the distance between the two entrances and exits of the power tunnel generally being no more than 75m, the net tunnel height generally being no less than 1.90m, but the local area can be suitably lowered when difficult. The net height of the electric power tunnel constructed many years ago is not enough, and the bending in the narrow tunnel and the cable racks at two sides are limited, so that the personnel can work in the narrow tunnel only.
At present, three or more elevation control measures of underground power cable tunnel elevation control measurement and linkage measurement are generally leveling measures, and four or five or more elevation control measures can be leveling measures or electro-optical ranging triangular elevation measures. When leveling measurement is adopted, round trip observation should be performed; when adopting electro-optical ranging triangular elevation measurement, opposite direction observation should be carried out; the elevation leads preferably form a closed loop. When leveling is adopted in the power tunnel elevation measurement, in addition to a conventional method, an inverse ruler method is sometimes adopted to transfer the elevation so as to avoid construction interference. When the inverse rule method is applied to transfer the elevation, the reading of the inverse rule is regulated to be negative, and the calculation of the elevation difference is the same as that of a conventional leveling method.
The vertical shaft depth is generally about 10 meters, and the well head becomes a serious hazard source after the well cover is uncovered. The underground personnel and the underground personnel are fully communicated in advance and closely matched in the process, and the elevation connection measurement of the ground and the underground tunnel is carried out through the vertical shaft on the premise of ensuring the safety of the personnel and the instruments. The personnel on the well firstly ensure the safety of the personnel on the well, and meanwhile, the personnel on the well has the responsibility of protecting the personnel on the well. Firstly, cleaning the wellhead and the nearby area, after the wellhead is uncovered, the safety net should be covered on the wellhead immediately to prevent personnel or sundries at the wellhead from falling, underground personnel must wear safety caps, no password of the personnel at the wellhead exists, and the personnel at the well cannot be located below the wellhead.
Because of the limitation of curvature in a narrow tunnel, cable racks on two sides and the like, the ratio of the front view side length to the rear view side length is considered, so that the length of a wire is not longer than 50 meters, the length of the wire is shorter than 10 meters, the average side length of the wire in a procedure is greatly different from that of the wire, and the measurement precision of the wire and the triangular elevation of the wire is limited; for leveling methods, ruler length limitation, line-of-sight limitation, light limitation and the like also have an influence on the power tunnel elevation measurement.
The invention discloses an underground electric power tunnel engineering elevation measurement method which is low in cost and simple to operate; the assembly is convenient, the height measurement precision is high, and the method has remarkable economic and social benefits. Especially has good popularization value for the conditions of narrow inside, more bending, poor internal vision condition and the like of the tunnel.
Disclosure of Invention
The invention aims to provide an underground electric power tunnel engineering elevation measurement method which adopts a communication principle which is not easily affected by space to carry out elevation transmission. The defect of difficult implementation of traditional level and wire measurement in the tunnel is solved by utilizing the communicating vessel principle, and the working efficiency is improved.
In order to solve the technical problems, the invention adopts the following technical scheme: an underground electric power tunnel engineering elevation measurement method comprises the following steps:
s1, selecting a known elevation point of the ground on one side outside the vertical shaft, and determining that the elevation value of the known elevation point of the ground is H 0 Arranging a wellhead elevation point outside a shaft mouth, carrying out joint measurement to the wellhead side elevation point through a leveling rod and a leveling instrument, and solving that the elevation value of the wellhead elevation point is H 1 As the starting point of the underground suspension steel rule elevation transmission;
s2, erecting a level gauge with a horizontal extension bracket on a height point of a shaft mouth, arranging a hanging steel rule which sags inwards in the shaft on the horizontal extension bracket, and measuring the height difference h between the height point of the shaft mouth and the bottom of the horizontal extension bracket by adopting the hanging steel rule 0 And record the initial scale h at the bottom of the horizontally extending bracket 1 ；
S3, arranging an underground elevation point under the vertical shaft, arranging a right-angle triangular rule on the underground elevation point, attaching a horizontal right-angle side of the right-angle triangular rule to the underground Gao Chengdian, overlapping a vertical right-angle side with the hanging steel rule, and recording a reading h corresponding to the horizontal right-angle side of the right-angle triangular rule 2 ；
S4, according to the height difference between the vertical shaft mouth height point and the underground height point, obtaining the height value H of the underground height point 2 ；
S5, setting N tunnel elevation points in the tunnel, setting vertical level pipes on the underground Gao Chengdian tunnel elevation points and each tunnel elevation point, and sequentially calculating the elevation difference h between the underground elevation point and the tunnel elevation point and between every two tunnel elevation points by using a hanging steel rule and a right-angle triangular rule p ；
S6, utilizing the elevation of the underground elevation pointValue H 2 Accumulated value of height difference between adjacent elevation pointsThe elevation H of the tunnel Gao Chengdian to be solved is obtained.
The technical scheme of the invention is further improved as follows: and in the step S1, the height of the shaft mouth is measured to be Cheng Dianju, and the shaft mouth is 0.5-1.0 m.
The technical scheme of the invention is further improved as follows: the length of the horizontally extending bracket in the step S2 is 1m.
The technical scheme of the invention is further improved as follows: the specific steps in the step S4 are as follows:
step S41, calculating a nominal height difference between a shaft mouth height point and a downhole Gao Chengdian:
L 0 ＝h 2 -h 1 -h 0 ，
step S42, correcting the nominal height difference, and solving the actual length of the suspended steel rule under the conditions of tension and temperature:
L t ＝L 0 +ΔL+α×L 0 ×(t-t 0 )，
in which L t For the actual measurement of the length of the suspended steel rule, alpha is the expansion coefficient of the steel rule, deltaL is the rule length correction, t is the actual temperature, t 0 The temperature is the temperature of the suspension steel ruler during verification;
step S43, obtaining the elevation value H of the underground elevation point 2 ：
H 2 ＝H 1 -L t 。
The technical scheme of the invention is further improved as follows: the specific steps of the step S5 are as follows:
s51, pouring cement piers with the height of 30cm multiplied by 30cm at the positions of underground Gao Chengdian and each tunnel elevation point, and placing elevation point marks on the cement piers;
s52, arranging a fixing device for fixing the level pipe on the cement pier, wherein the fixing device is provided with a telescopic rod;
s53, respectively carrying out sealing connection on every two adjacent level pipes by using a communicating water pipe, respectively comparing the heights of the two adjacent level pipes, fixing a high-side level pipe, injecting water into the high-side level pipe, adjusting the position of a low-side level pipe through a telescopic rod on a fixing device according to actual topography, and fixing the low-side level pipe when the liquid surfaces of the low-side level pipe and the high-side level pipe are on the same horizontal line and are higher than the connecting positions of the communicating water pipe, the low-side level pipe and the high-side level pipe;
s54, taking down the hanging steel rule from the horizontal extension bracket and respectively fixing the hanging steel rule at the liquid level position of each level pipe, pasting the horizontal right-angle side of the right-angle triangular rule on an underground elevation point and each tunnel height Cheng Dian, overlapping the vertical right-angle side with the hanging steel rule, and respectively recording the corresponding reading h of the horizontal right-angle side of the right-angle triangular rule i2 Reading h corresponding to liquid level of level pipe i1 So the height difference h 'between the underground elevation point, the tunnel height Cheng Dian and the level of the level pipe' i The method comprises the following steps of:
h′ i ＝h i2 -h i1 ，
wherein when i=1, h i1 The numerical value h of the liquid level steel rule of the underground elevation point level pipe i2 Suspending steel ruler values for the underground elevation points; when i=2, 3,4 … N, h i1 The steel ruler value h of the liquid level of the level pipe at the i-1 th tunnel elevation point i2 Suspending steel ruler values for the i-1 tunnel elevation points;
s55, sequentially calculating the height difference h between the underground elevation point and the tunnel elevation point and between every two tunnel elevation points p ：
h p ＝h′ i -h′ i+1 。
The technical scheme of the invention is further improved as follows: in the step S6, the elevation value H of the tunnel Gao Chengdian to be solved is:
wherein N is the N-th tunnel elevation point of the joint measurement in the tunnel, and N is more than or equal to 1 and less than or equal to N.
By adopting the technical scheme, the invention has the following technical progress:
1. the invention discloses an underground electric power tunnel engineering elevation measurement method, and particularly aims at the situations of multiple tunnel bending positions and narrow interior. Firstly, arranging wellhead elevation points at a shaft mouth, and carrying out level joint measurement with the known elevation points on the ground; then erecting a level gauge with a horizontally extending bracket on a height measuring point of a shaft mouth, and utilizing a hanging steel rule to carry out the inner and outer heights Cheng Chuandi of the tunnel of the elevation so as to obtain accurate calculation data of the elevation in the electric power tunnel; arranging N tunnel elevation points in the tunnel, arranging level pipes, fixing vertical level pipes on each tunnel elevation point by using a communicating vessel principle, tightly sealing and connecting every two adjacent level pipes by using a communicating water pipe, completing Gao Chengdian and level pipe liquid level difference calculation by means of a hanging steel rule and a right-angle triangular rule, calculating the height difference between the two tunnel elevation points according to the same level of the level pipes communicated with the two adjacent tunnel elevation points, and sequentially accumulating and calculating to obtain the elevation value of each tunnel elevation point. This patent has fine spreading value to the inside narrow, crooked many of tunnel, inside bad condition etc. that lets go of. The cost is low, and the operation is simple; the assembly is convenient, the height measurement precision is high, the leveling measurement precision can be achieved, and the economic and social benefits are remarkable;
2. the interior of the electric power tunnel is limited by space environment, bending trend and the like, so that the traditional level and wire measurement implementation difficulty is high, and the invention adopts the communication principle which is not easily affected by space to carry out elevation transmission. The utility model discloses a traditional level and wire measuring implementation difficulty's in the tunnel drawback is solved to the utilization intercommunication ware principle, improves work efficiency, and the intercommunication level pipe cost is very little moreover, easy operation, convenient to carry, accomplishes Gao Chengdian and level pipe liquid level difference measurement through the triangular rule with the help of the method of hanging the steel rule, and then calculates the difference in height between two adjacent elevation points. Reaching the level measurement precision level.
Drawings
FIG. 1 is a schematic measurement of step S1 of the present invention;
FIG. 2 is a schematic diagram of the measurement of steps S2-S4 of the present invention;
FIG. 3 is a schematic diagram of the measurement of steps S51-S52 of the present invention;
FIG. 4 is a schematic diagram of the measurement of steps S53-S55 of the present invention;
the well-head height measuring device comprises a leveling rod, a ground known elevation point, a leveling instrument, a well head elevation point, a horizontal extension support, a right-angle triangular rule, a leveling pipe, a connecting water pipe, a cement pier, a telescopic rod, a hanging steel rod, a well-under elevation point, a tunnel elevation point and a tunnel elevation point, wherein the elevation point is 1, the leveling rod, 2, the ground known elevation point, 3, the leveling instrument, 4, the well-head elevation point, 5, the horizontal extension support, 6, the right-angle triangular rule, 7, the leveling pipe, 8, the connecting water pipe, 9, the cement pier, 10, the telescopic rod, 11, the hanging steel rod, 12, the well-under elevation point and 13.
Detailed Description
The invention is further illustrated by the following examples:
as shown in fig. 1 to 4, an underground power tunnel engineering elevation measurement method includes the steps of:
s1, selecting a ground known elevation point 2 at one side outside a vertical shaft, and determining that the elevation value of the ground known elevation point 2 is H 0 Arranging a wellhead elevation point 4 outside a shaft mouth, measuring the wellhead elevation point 4 to the wellhead side elevation point 4 by a leveling rod 1 and a leveling instrument 3 in a joint way, and obtaining the elevation value H of the wellhead elevation point 4 1 As the starting point of the underground suspension steel rule elevation transmission;
s2, erecting a level gauge 3 with a horizontally extending support 5 on a shaft mouth height measuring point 4, wherein the length of the horizontally extending support is 1m, the stability of the level gauge 3 can be influenced by overlong, and the elevation transfer work can be influenced by overlong. A hanging steel rule 11 which sags towards the interior of the vertical shaft is arranged on the horizontal extension bracket 5, and the hanging steel rule 11 is used for measuring the height difference h between the height point 4 of the vertical shaft mouth and the bottom of the horizontal extension bracket 5 0 And records the initial scale h at the bottom of the horizontally extending bracket 5 1 ；
S3, arranging an underground elevation point 12 under the vertical shaft, arranging a right-angle triangular rule 6 on the underground elevation point 12, attaching a horizontal right-angle side of the right-angle triangular rule 6 to the underground elevation point 12, overlapping a vertical right-angle side with a hanging steel rule 11, and recording a reading h corresponding to the horizontal right-angle side of the right-angle triangular rule 6 2 ；
S4, according to the height difference between the vertical shaft mouth height point 4 and the underground height point 12, obtaining the height value H of the underground height point 12 2 The method comprises the steps of carrying out a first treatment on the surface of the The method comprises the following specific steps:
step S41, calculating a nominal height difference between the shaft mouth height point 4 and the underground height point 12:
L 0 ＝h 2 -h 1 -h 0 ，
step S42, measuring the nominal height difference, namely correcting the length of the rule, and solving the actual length of the suspended steel rule 11 under the conditions of tension and temperature:
L t ＝L 0 +ΔL+α×L 0 ×(t-t 0 )，
in which L t For the actual measurement of the length of the suspended steel rule, alpha is the expansion coefficient of the steel rule, deltaL is the rule length correction, t is the actual temperature, t 0 The temperature is the temperature of the suspension steel ruler during verification;
step S43, determining the elevation value H of the downhole elevation point 12 2 ：
H 2 ＝H 1 -L t ；
S5, setting N tunnel elevation points 13 in the tunnel, setting vertical level pipes 7 on the underground elevation points 12 and each tunnel elevation point 13, and sequentially calculating the height difference h between the underground elevation points 12 and the tunnel elevation points 13 and between every two tunnel elevation points 13 by using the suspension steel rule 11 and the right-angle triangular rule 6 p The method comprises the steps of carrying out a first treatment on the surface of the The method comprises the following specific steps:
s51, pouring cement piers 9 with the height points of 30cm multiplied by 30cm at the positions of the underground elevation points 12 and the tunnel elevation points 13, and placing elevation point marks on the cement piers 9;
s52, arranging a fixing device for fixing the level pipe on the cement pier 9, wherein the fixing device is provided with a telescopic rod 10;
s53, respectively carrying out sealing connection on every two adjacent leveling pipes 7 by using a communicating water pipe 8, respectively comparing the heights of the two adjacent leveling pipes 7, fixing a high-side leveling pipe 7, injecting water into the high-side leveling pipe 7, adjusting the position of a low-side leveling pipe 7 through a telescopic rod 10 on a fixing device according to actual topography, and fixing the low-side leveling pipe 7 when the liquid surfaces of the low-side leveling pipe 7 and the high-side leveling pipe 7 are all on the same horizontal line and the liquid surface is higher than the connecting positions of the communicating water pipes 8 and the low-side leveling pipe 7 and the high-side leveling pipe 7 respectively;
s54, the hanging steel rule 11 is taken off from the horizontal extension bracket 5 and is respectively fixed at the liquid level position of each level pipe 7, and meanwhile, the horizontal right-angle edge of the right-angle triangular rule 6 is attached to the underground elevation point 12 and each tunnel elevation point 13, and the vertical right-angle triangular rule 6 is attached to the horizontal right-angle edge of each tunnel elevation point 13The edges are overlapped with the hanging steel rule 11, and the readings h corresponding to the horizontal right-angle edges of the right-angle triangular rule 6 are respectively recorded i2 Reading h corresponding to liquid level of level pipe i1 The measurement length is considered to be shorter, and the measurement reading can be directly used for calculation processing without considering the length correction; so the height difference h 'between the underground elevation point 12 and the level of each tunnel elevation point 13 and the level pipe' i The method comprises the following steps of:
h′ i ＝h i2 -h i1 ，
wherein when i=1, h i1 The numerical value h of the liquid level steel rule of the underground elevation point level pipe i2 Suspending steel ruler values for the underground elevation points; when i=2, 3,4 … N, h i1 The steel ruler value h of the liquid level of the level pipe at the i-1 th tunnel elevation point i2 Suspending steel ruler values for the i-1 tunnel elevation points;
s55, sequentially calculating the height difference h between the underground elevation point 12 and the tunnel elevation point 13 and between every two tunnel elevation points 13 p ：
h p ＝h′ i -h′ i+1 ；
S6, utilizing the elevation value H of the underground elevation point 12 2 Accumulated value of height difference between adjacent elevation pointsThe altitude value H of the tunnel altitude point 13 to be solved is obtained as follows:
wherein N is the nth elevation point of the joint measurement in the tunnel, and N is more than or equal to 1 and less than or equal to N.
The invention discloses an underground electric power tunnel engineering elevation measurement method, and particularly aims at the situations of multiple tunnel bending positions and narrow interior. Firstly, arranging wellhead elevation points at a shaft mouth, and carrying out level joint measurement with the known elevation points on the ground; then erecting a level gauge with a horizontally extending bracket on a height measuring point of a shaft mouth, and utilizing a hanging steel rule 11 to carry out the inner and outer heights Cheng Chuandi of the tunnel of the elevation so as to obtain accurate calculation data of the elevation in the electric power tunnel; the method comprises the steps of arranging N tunnel elevation points in a tunnel, arranging leveling pipes, fixing vertical leveling pipes 7 on each tunnel elevation point by using a communicating vessel principle, tightly sealing and connecting every two adjacent leveling pipes 7 by using a communicating water pipe 8, calculating the height Cheng Dian and the liquid level height difference of the leveling pipes 7 by means of a hanging steel ruler 11 and a right-angle triangular ruler 6, calculating the height difference between the two tunnel elevation points according to the same liquid level height of the leveling pipes communicated with the two adjacent tunnel elevation points, and sequentially accumulating and calculating to obtain the elevation value of each tunnel elevation point. This patent has fine spreading value to the inside narrow, crooked many of tunnel, inside bad condition etc. that lets go of. The cost is low, and the operation is simple; the assembly is convenient, the height measurement precision is high, the leveling measurement precision can be achieved, and the method has remarkable economic and social benefits.
Claims (6)
1. The utility model provides a secret electric power tunnel engineering elevation measurement method which characterized in that: the method comprises the following steps:
s1, selecting a ground known elevation point (2) at one side outside a vertical shaft, and determining that the elevation value of the ground known elevation point (2) is H 0 Arranging a wellhead elevation point (4) outside a shaft mouth, carrying out joint measurement to the wellhead side elevation point (4) through a leveling rod (1) and a leveling instrument (3), and obtaining the elevation value of the wellhead elevation point (4) as H 1 As the starting point of the underground suspension steel rule elevation transmission;
s2, erecting a level gauge (3) with a horizontal extension bracket (5) on a shaft mouth height measurement point (4), arranging a hanging steel rule (11) which sags inwards in the shaft on the horizontal extension bracket (5), and measuring the height difference h between the shaft mouth height measurement point (4) and the bottom of the horizontal extension bracket (5) by adopting the hanging steel rule (11) 0 And records the initial scale h at the bottom of the horizontal extension bracket (5) 1 ；
S3, arranging an underground elevation point (12) under the vertical shaft, arranging a right-angle triangular rule (6) on the underground elevation point (12), attaching the horizontal right-angle side of the right-angle triangular rule (6) to the underground elevation point (12), overlapping the vertical right-angle side with a hanging steel rule (11), and recording a reading h corresponding to the horizontal right-angle side of the right-angle triangular rule (6) 2 ；
S4, measuring an elevation point (4) and an underground elevation point according to the shaft mouth(12) The elevation value H of the underground elevation point (12) is obtained 2 ；
S5, setting N tunnel elevation points (13) in a tunnel, setting vertical level pipes (7) on the underground elevation points (12) and each tunnel elevation point (13), and sequentially calculating the height difference h between the underground elevation points (12) and the tunnel elevation points (13) and between every two tunnel elevation points (13) by using a hanging steel rule (11) and a right-angle triangular rule (6) p ；
S6, utilizing the elevation value H of the underground elevation point (12) 2 Accumulated value of height difference between adjacent elevation pointsObtaining the elevation value H of the tunnel elevation point (13) to be solved.
2. The method for measuring the elevation of an underground power tunnel project according to claim 1, wherein: and in the step S1, the height of the elevation point (4) of the shaft mouth is 0.5-1.0 meter away from the shaft mouth.
3. The method for measuring the elevation of an underground power tunnel project according to claim 1, wherein: the length of the horizontally extending bracket (5) in the step S2 is 1m.
4. The method for measuring the elevation of an underground power tunnel project according to claim 1, wherein: the specific steps in the step S4 are as follows:
step S41, calculating a nominal height difference between a shaft mouth elevation point (4) and a downhole elevation point (12):
L 0 ＝h 2 -h 1 -h 0 ，
s42, correcting the nominal height difference, and obtaining the actual length of the suspended steel rule (11) under the conditions of tension and temperature:
L t ＝L 0 +ΔL+α×L 0 ×(t-t 0 )，
in which L t For the actual measurement of the length of the suspended steel rule, alpha is the expansion coefficient of the steel rule, deltaL is the rule length correction, t is the actual temperature, t 0 The temperature is the temperature of the suspension steel ruler during verification;
step S43, obtaining the elevation value H of the underground elevation point (12) 2 ：
H 2 ＝H 1 -L t 。
5. The method for measuring the elevation of the underground power tunnel engineering according to claim 4, wherein: the specific steps of the step S5 are as follows:
s51, pouring cement piers (9) with the height points of 30cm multiplied by 30cm at the positions of the underground elevation points (12) and the tunnel elevation points (13), and placing elevation point marks on the cement piers;
s52, arranging a fixing device for fixing the level pipe on the cement pier (9), wherein the fixing device is provided with a telescopic rod (10);
s53, respectively carrying out sealing connection on every two adjacent leveling pipes (7) by using a communicating water pipe (8), respectively comparing the heights of the two adjacent leveling pipes (7), fixing a high-side leveling pipe (7) and injecting water into the high-side leveling pipe (7), adjusting the position of a low-side leveling pipe (7) through a telescopic rod (10) on a fixing device according to actual topography, and fixing the low-side leveling pipe (7) when the liquid surfaces of the low-side leveling pipe (7) and the high-side leveling pipe (7) are on the same horizontal line and the liquid surface is higher than the connecting position of the communicating water pipe (8) and the low-side leveling pipe (7) respectively;
s54, taking down the hanging steel rule (11) from the horizontal extension bracket (5) and respectively fixing the hanging steel rule (11) at the liquid level position of each level pipe (7), pasting the horizontal right-angle side of the right-angle triangular rule (6) on the underground elevation point (12) and each tunnel elevation point (13), overlapping the vertical right-angle side with the hanging steel rule (11), and respectively recording the readings h corresponding to the horizontal right-angle side of the right-angle triangular rule (6) i2 Reading h corresponding to liquid level of level pipe i1 So that the height difference h 'between the underground elevation point (12) and the elevation point (13) of each tunnel and the liquid level of the level tube' i The method comprises the following steps of:
h′ i ＝h i2 -h i1 ，
wherein when i=1, h i1 The numerical value h of the liquid level steel rule of the underground elevation point level pipe i2 Suspending steel ruler values for the underground elevation points; when i=2, 3,4 … N, h i1 The steel ruler value h of the liquid level of the level pipe at the i-1 th tunnel elevation point i2 Suspending steel ruler values for the i-1 tunnel elevation points;
s55, sequentially calculating the height difference h between the underground elevation point (12) and the tunnel elevation point (13) and between every two tunnel elevation points (13) p ：
h p ＝h′ i -h′ i+1 。
6. The method for measuring the elevation of the underground power tunnel engineering according to claim 5, wherein: in the step S6, the elevation value H of the tunnel elevation point (13) to be solved is:
wherein N is the N-th tunnel elevation point of the joint measurement in the tunnel, and N is more than or equal to 1 and less than or equal to N.
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