CN114964161A - Immersed tube mounting plane precision detection method - Google Patents
Immersed tube mounting plane precision detection method Download PDFInfo
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- CN114964161A CN114964161A CN202210628126.8A CN202210628126A CN114964161A CN 114964161 A CN114964161 A CN 114964161A CN 202210628126 A CN202210628126 A CN 202210628126A CN 114964161 A CN114964161 A CN 114964161A
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- 238000001514 detection method Methods 0.000 title claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 29
- 238000009434 installation Methods 0.000 claims abstract description 18
- 238000009417 prefabrication Methods 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 21
- 210000001503 joint Anatomy 0.000 description 15
- 238000010276 construction Methods 0.000 description 6
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009428 plumbing Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C9/00—Measuring inclination, e.g. by clinometers, by levels
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C3/00—Measuring distances in line of sight; Optical rangefinders
- G01C3/10—Measuring distances in line of sight; Optical rangefinders using a parallactic triangle with variable angles and a base of fixed length in the observation station, e.g. in the instrument
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Length Measuring Devices With Unspecified Measuring Means (AREA)
Abstract
The invention relates to a method for detecting the precision of an immersed tube installation plane, which belongs to the technical field of immersed tube tunnels and specifically comprises the following steps: selecting characteristic points, and correspondingly arranging a characteristic point SB1 and a characteristic point WB1 at the head end and the tail end in the pipe joint respectively; installing a measuring tower, and respectively installing the measuring tower at the positions corresponding to the characteristic point SB1 and the characteristic point WB1 at the top of the prefabricated pipe joint; measuring the coordinates of the feature point SB1 and the feature point WB 1; erecting a vertical collimator, erecting the vertical collimator at a characteristic point SB1 and a characteristic point WB1 respectively after the pipe joints are completely sunk, and vertically projecting the positions of the characteristic point SB1 and the characteristic point WB1 to the top of the measuring tower so as to obtain a corresponding point ST1 and a corresponding point WT1 at the top of the measuring tower; measuring the coordinates of a corresponding point ST1 and a corresponding point WT1 at the top of the measuring tower; and analyzing results, and obtaining the accuracy of the mounting plane of the immersed tube by analyzing and comparing the coordinates of the feature point SB1 and the feature point WB1 with the coordinates of the corresponding point ST1 and the corresponding point WT 1. The immersed tube mounting plane precision detection method can visually reflect the measurement result and is high in measurement precision.
Description
Technical Field
The invention belongs to the technical field of immersed tube tunnels, and particularly relates to a method for detecting the accuracy of an immersed tube mounting plane.
Background
The immersed tube tunnel construction is that the immersed tube pipe joints prefabricated in a semi-submerged barge or dry dock are transported to a preset position in a floating mode to be immersed and butted in sequence, and the adjacent pipe joints need to meet the requirement of very high axis precision so as to guarantee that the immersed tube pipe joints can be butted smoothly. The immersed tube pipe joint is inevitably influenced by factors such as seawater flow velocity when being immersed, so that the pipe joint which should be horizontally placed originally generates axis deviation in a horizontal plane, and the central axes of the adjacent pipe joints are not collinear, therefore, the measurement of the accuracy of the installation plane of the immersed tube pipe joint has important significance for the butt joint construction of the pipe joints.
At present, people mostly adopt a method of through measurement in a pipe joint hole to check the plane axis precision of the pipe joint, although the measuring method can effectively measure the plane precision of the pipe joint, the through distance of the immersed tube tunnel is long, and due to the influence of factors such as marine observation conditions, the measuring precision of the axis of the immersed tube joint cannot be guaranteed only by the through measuring method in the tunnel hole, so that the installation and construction of the immersed tube joint are not facilitated, and the smooth through of the immersed tube tunnel construction brings great risk.
Disclosure of Invention
Aiming at the defects in the related art, the invention provides the immersed tube mounting plane precision detection method, so that the immersed tube mounting plane precision detection process is simplified, the measurement process is simple and reliable, and the measurement precision is high.
The invention provides a method for detecting the precision of an immersed tube installation plane, which comprises the following steps:
selecting characteristic points: respectively and correspondingly arranging a characteristic point SB1 and a characteristic point WB1 at the head end and the tail end in the pipe joint;
installing a measuring tower: after prefabrication of the pipe joints is completed, respectively installing measuring towers at positions corresponding to the characteristic points SB1 and WB1 on the tops of the pipe joints;
measuring the coordinates of the characteristic points: respectively measuring the coordinates of the feature point SB1 and the feature point WB 1;
erecting a vertical calibrator: after the pipe joints are settled, erecting a vertical collimator at a characteristic point SB1 and a characteristic point WB1 respectively, and vertically projecting the positions of the characteristic point SB1 and the characteristic point WB1 to the top of the measuring tower so as to obtain a corresponding point ST1 and a corresponding point WT1 at the top of the measuring tower;
measuring coordinates of corresponding points: respectively measuring the coordinates of a corresponding point ST1 and a corresponding point WT1 at the top of the measuring tower;
and (4) analyzing results: the accuracy of the mounting plane of the immersed tube can be obtained by analyzing and comparing the coordinates of the feature point SB1 and the feature point WB1 with the coordinates of the corresponding point ST1 and the corresponding point WT 1.
According to the technical scheme, the coordinates of the characteristic points before and after the pipe joint is sunk are compared and analyzed to obtain the accuracy of a sunk pipe installation plane, a measuring tower and a vertical collimator are utilized to obtain a corresponding point ST1 and a corresponding point WT1 which correspond to the positions of a characteristic point SB1 and a characteristic point WB1 in a pipe at the top of the measuring tower, and after the pipe joint is sunk, the coordinates of the measured characteristic point SB1 and the measured characteristic point WB1 are converted into the coordinates of a measured corresponding point ST1 and a measured corresponding point WT1, so that the measuring process is simplified; by comparing the coordinates of the feature point SB1 and the feature point WB1 with the coordinates of the corresponding point ST1 and the corresponding point WT1, the installation accuracy of the immersed tube can be reflected more intuitively, the measurement process is simple, the factors influencing the measurement accuracy in the whole measurement process are few, and the measurement accuracy is high.
In some embodiments, in the step of selecting the feature points, the feature points SB1 and WB1 are projected from manhole wells at the head and tail ends of the pipe joint to correspond to the positions of the measuring towers installed at the head and tail ends of the pipe joint.
In some of these embodiments, a zenith and nadir or laser device is used to cast points into the interior of the pipe joints at the top of the manhole well to determine feature points SB1 and WB 1.
According to the technical scheme, the zenith and nadir instrument or the laser equipment is used for pointing to determine the characteristic point SB1 and the characteristic point WB1, the zenith and nadir instrument or the laser pointing can be used for realizing rapid pointing, and the pointing error is small.
In some embodiments, in the step of measuring the coordinates of the feature points, the coordinates of the feature point SB1 and the feature point WB1 are measured by using a total station and a prism, and the specific steps include:
installing a prism: respectively installing prisms at a characteristic point SB1 and a characteristic point WB1 inside the pipe joint;
and (3) measuring by using a total station: the total station measures the coordinates of feature point SB1 and feature point WB1 from the prism position.
According to the technical scheme, the prisms are arranged at the positions of the feature point SB1 and the feature point WB1, and coordinates of the feature point SB1 and the feature point WB1 are measured quickly and accurately by means of cooperation of the total station and the prisms.
In some embodiments, in the step of measuring coordinates of the corresponding point, the coordinates of the corresponding point ST1 and the corresponding point WT1 are measured by using a total station and a prism, and the specific steps include:
installing a prism: respectively installing prisms at a corresponding point ST1 and a corresponding point WT1 at the top of the measuring tower;
and (3) measuring by using a total station: the total station measures the coordinates of the corresponding point ST1 and the corresponding point WT1 from the prism position.
According to the technical scheme, the prism is arranged at the position of the corresponding point ST1 and the corresponding point WT1, and coordinates of the corresponding point ST1 and the corresponding point WT1 are measured quickly and accurately by means of cooperation of the total station and the prism.
In some of these embodiments, in the step of measuring the coordinates of the corresponding points, the total station is placed on a measuring platform in the sea.
This technical scheme is through placing the survey platform in the sea with the total powerstation to avoid the total powerstation to place and survey and the measuring error that arouses at the bank that the distance is far away.
In some of these embodiments, feature point SB1, feature point WB1, corresponding point ST1, and corresponding point WT1 all need only measure x-axis coordinates and y-axis coordinates.
In some embodiments, in the result analyzing step, the specific analyzing process includes:
the difference between the measured x-axis coordinate and y-axis coordinate of the feature point SB1 and the x-axis coordinate and y-axis coordinate of the feature point WB1 is recorded as ζ x1 And ζ y1 ；
The measured x-axis coordinate and y-axis coordinate of the corresponding point ST1 are respectively differed from the x-axis coordinate and y-axis coordinate of the corresponding point WT1 and are respectively marked as zeta x2 And ζ y2 ；
Will ζ x1 And ζ x2 Making a difference and dividing ζ y1 And ζ y2 The difference values are respectively expressed as Δ ζ x 、Δζ y ；
Comparison Δ ζ x Tolerance of e to the x-axis x Relation of (1), Δ ζ y Tolerance of e to y-axis y The relationship of (1):
if Δ ζ x ≤ε x And Δ ζ y ≤ε y The immersed tube is accurately installed, and the accuracy of the mounting plane of the immersed tube is high;
if Δ ζ x ＞ε x And/or Δ ζ y ＞ε y The immersed tube is installed obliquely, and the accuracy of the installation plane of the immersed tube is low.
Based on the technical scheme, the method for detecting the accuracy of the immersed tube mounting plane in the embodiment of the invention can visually reflect the accuracy of the immersed tube mounting, and has the advantages of simple measurement process, less error influence factors and high measurement accuracy.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a working principle diagram of an embodiment of the immersed tube installation plane precision detection method of the invention.
In the figure:
1. a plumbing gauge; 2. a manhole well; 3. a prism; 4. a measuring tower; 5. a total station; 6. a measuring platform;
A. the head end of the immersed tube joint; B. the tail end of the immersed tube section.
Detailed Description
The technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1, in an exemplary embodiment of the method for detecting the accuracy of the mounting plane of the immersed tube according to the present invention, the method for detecting the accuracy of the mounting plane of the immersed tube comprises the following steps:
s1, selecting characteristic points: respectively and correspondingly arranging a characteristic point SB1 and a characteristic point WB1 inside the head end A, B of the immersed tube joint;
s2, installing a measuring tower: after prefabrication of the pipe joints is completed, respectively installing measuring towers 4 at positions corresponding to the characteristic points SB1 and WB1 at the tops of the pipe joints;
s3 measures feature point coordinates: respectively measuring the coordinates of the feature point SB1 and the feature point WB 1;
s4 erecting a vertical calibrator: after the pipe joints are settled, erecting a vertical collimator 1 at a characteristic point SB1 and a characteristic point WB1 respectively, and vertically projecting the positions of the characteristic point SB1 and the characteristic point WB1 to the top of the measuring tower 4 so as to obtain a corresponding point ST1 and a corresponding point WT1 at the top of the measuring tower 4;
s5 measures the corresponding point coordinates: respectively measuring the coordinates of a corresponding point ST1 and a corresponding point WT1 at the top of the tower 4;
analysis of results at S6: the accuracy of the mounting plane of the immersed tube can be obtained by analyzing and comparing the coordinates of the feature point SB1 and the feature point WB1 with the coordinates of the corresponding point ST1 and the corresponding point WT 1.
In order to reduce the position error between the corresponding point and the feature point after the pipe joint is sunk, in the step of selecting the feature point in S1, the point is required to be thrown from the manhole well 2 at the head and the tail of the pipe joint, so that the feature point SB1 and the feature point WB1 correspond to the position of the measuring tower 4 installed at the head and the tail of the pipe joint. Because the position of the pipe joint manhole shaft 2 is already determined in the pipe joint prefabricating process, and the measuring tower 4 needs to be installed according to the manhole shaft 2, the characteristic point SB1 and the characteristic point WB1 are firstly selected, then the measuring tower 4 is installed, and the measuring tower 4 can be finely adjusted according to the actual installation condition. It should be noted that, since the accuracy of the position selection of the feature points SB1 and WB1 is an important factor for the accurate detection of the accuracy of the sinking tube installation plane, a zenith and nadir or laser device is preferably used to cast points into the tube joints at the top of the manhole shaft 2 to determine the feature points SB1 and WB 1. The adoption of the zenith and nadir instrument has high pointing accuracy and good pointing stability, while the laser pointing has lower accuracy than the zenith and nadir instrument but has low cost. In actual construction, two modes can be adopted at the same time, and results are compared, so that the casting accuracy is further improved.
The immersed tube mounting plane precision detection method can visually reflect the immersed tube mounting precision, and is simple in measurement process, few in error influence factors and high in measurement precision. The coordinates of the feature point SB1 and the feature point WB1 after the pipe joint is sunk are inconvenient to measure, and the measurement process is simplified by converting the coordinates of the feature point SB1 and the feature point WB1 after the pipe joint is sunk into the coordinates of the measurement corresponding point ST1 and the corresponding point WT 1.
In order to improve the accuracy of measuring the coordinates of the feature point SB1 and the feature point WB1, in the step of measuring the coordinates of the feature point S3, the coordinates of the feature point SB1 and the feature point WB1 are measured using the total station 5 and the prism 3, and the method specifically includes the following steps:
s301, installing a prism: respectively installing prisms 3 at a characteristic point SB1 and a characteristic point WB1 inside the pipe joint;
s301, measuring by using a total station: the total station 5 measures the coordinates of the feature point SB1 and the feature point WB1 from the prism 3 position.
It should be noted that in the step S301 of installing the prism 3, after the coordinate measurement of the feature point SB1 and the feature point WB1 is completed, the prism 3 can be detached, so that on one hand, the prism 3 is prevented from being damaged in the process of sinking the pipe joint; on the other hand, the coordinates of the feature point SB1 and the feature point WB1 are already measured, and the coordinates of the feature point SB1 and the feature point WB1 do not need to be measured again after the pipe joint is lowered to the seabed.
In order to improve the measurement accuracy of the coordinates of the corresponding point ST1 and the corresponding point WT1, in the step of measuring the coordinates of the corresponding point S4, the coordinates of the corresponding point ST1 and the corresponding point WT1 are measured by using the total station 5 and the prism 3, and the specific steps include:
s401, installing a prism: the prism 3 is respectively arranged at a corresponding point ST1 and a corresponding point WT1 at the top of the measuring tower 4;
s402, measuring by using a total station: the total station 5 measures the coordinates of the corresponding point ST1 and the corresponding point WT1 according to the prism 3 position.
Note that, in the total station 5 surveying step S402, the total station 5 is placed on the surveying platform 6 in the sea.
To simplify the measurement process, the feature point SB1, the feature point WB1, the corresponding point ST1, and the corresponding point WT1 each need only measure x-axis coordinates and y-axis coordinates. In the step of analyzing the result of S6, the specific analysis process includes:
s601, respectively marking the difference value between the measured x-axis coordinate and the measured y-axis coordinate of the characteristic point SB1 and the x-axis coordinate and the y-axis coordinate of the characteristic point WB1 as zeta x1 And ζ y1 ；
S602 coordinates of the measured corresponding point ST1 on the x-axis and y-axis are respectively associated with the corresponding point WT1The difference between the x-axis coordinate and the y-axis coordinate is recorded as ζ x2 And ζ y2 ；
S603 sum total of x1 And ζ x2 Making a difference and dividing ζ y1 And ζ y2 The difference values are respectively expressed as Δ ζ x 、Δζ y ；
S604 comparing Δ ζ x Tolerance of x-axis x Relation of (1), Δ ζ y Tolerance of e to y-axis y The relationship of (1):
if Δ ζ x ≤ε x And Δ ζ y ≤ε y The immersed tube is accurately installed, and the accuracy of the mounting plane of the immersed tube is high;
if Δ ζ x ＞ε x And/or Δ ζ y ＞ε y The immersed tube is installed obliquely, and the accuracy of the installation plane of the immersed tube is low.
In actual measurement, there is an inevitable error, ζ, in the measurement result due to the influence of equipment, manual operation, and the like x1 And ζ x2 The values are difficult to be completely equal, and are also zeta y1 And ζ y2 It is difficult to make the values completely equal, and therefore, ζ x1 And ζ x2 Difference in value Δ ζ x And ζ y1 And ζ y2 Difference Δ ζ of numerical values y And respectively in the error allowable range, namely the pipe joints can be accurately installed. Note that Δ ζ x And epsilon x The larger the difference is, the larger the deviation of the pipe joint in the x-axis direction is; Δ ζ y And epsilon y The larger the difference, the larger the offset of the pipe joint in the y-axis direction. In addition, it should be noted that the x-axis tolerance ε x And y-axis tolerance epsilon y The range is determined by actual construction, is not a constant value, and epsilon x And epsilon y The numerical values of (A) and (B) are not necessarily the same, and it can be determined that Δ ζ is x And epsilon x Difference and Δ ζ of y And epsilon y The smaller the difference value is, the more accurate the pipe joint installation is.
Finally, it should be noted that: the embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (8)
1. The immersed tube mounting plane precision detection method is characterized by comprising the following steps:
selecting characteristic points: respectively and correspondingly arranging a characteristic point SB1 and a characteristic point WB1 at the head end and the tail end in the pipe joint;
installing a measuring tower: after prefabrication of the pipe joints is completed, respectively installing measuring towers at positions corresponding to the feature points SB1 and WB1 on the tops of the pipe joints;
measuring the coordinates of the characteristic points: the coordinates of the feature point SB1 and the feature point WB1 are measured, respectively;
erecting a vertical calibrator: after the pipe joints are completely sunk, erecting a vertical collimator at the characteristic point SB1 and the characteristic point WB1 respectively, and vertically projecting the positions of the characteristic point SB1 and the characteristic point WB1 to the top of the measuring tower so as to obtain a corresponding point ST1 and a corresponding point WT1 at the top of the measuring tower;
measuring coordinates of corresponding points: measuring the coordinates of the corresponding point ST1 and the corresponding point WT1 at the top of the measuring tower respectively;
and (4) analyzing results: the accuracy of the mounting plane of the immersed tube can be obtained by analyzing and comparing the coordinates of the characteristic point SB1 and the characteristic point WB1 with the coordinates of the corresponding point ST1 and the corresponding point WT 1.
2. The method for detecting the accuracy of the installation plane of the immersed tube as claimed in claim 1, wherein in the step of selecting the characteristic points, the characteristic points SB1 and WB1 are projected from manhole wells at the head and the tail ends of the tube section so as to correspond to the positions of the measuring towers installed at the head and the tail ends of the tube section.
3. The method for detecting the accuracy of the installation plane of the immersed tube as claimed in claim 2, wherein a zenith nadir or a laser device is used for casting points to the inside of a tube joint at the top of the manhole well so as to determine the feature point SB1 and the feature point WB 1.
4. The method for detecting the accuracy of the mounting plane of the immersed tube according to claim 1, wherein in the step of measuring the coordinates of the feature point, the coordinates of the feature point SB1 and the feature point WB1 are measured by using a total station and a prism, and the specific steps include:
installing a prism: respectively installing prisms at the characteristic point SB1 and the characteristic point WB1 inside the pipe joint;
and (3) measuring by using a total station: the total station measures the coordinates of the feature point SB1 and the feature point WB1 from the prism position.
5. The method for detecting the accuracy of the immersed tube installation plane according to claim 1, wherein in the step of measuring the coordinates of the corresponding point, the coordinates of the corresponding point ST1 and the corresponding point WT1 are measured by using a total station and a prism, and the specific steps comprise:
installing a prism: installing prisms at the corresponding point ST1 and the corresponding point WT1 on the tower top of the measuring tower respectively;
and (3) measuring by using a total station: the total station measures the coordinates of the corresponding point ST1 and the corresponding point WT1 from the prism position.
6. The method of claim 5, wherein in the step of measuring the coordinates of the corresponding points, the total station is placed on a measuring platform in the sea.
7. The immersed tube installation plane precision detection method according to claim 1, wherein the feature point SB1, the feature point WB1, the corresponding point ST1 and the corresponding point WT1 all only need to measure x-axis coordinates and y-axis coordinates.
8. The immersed tube installation plane precision detection method according to claim 7, wherein in the result analysis step, the specific analysis process comprises:
the measured x-axis coordinate and y-axis coordinate of the feature point SB1 are respectively differed from the x-axis coordinate and y-axis coordinate of the feature point WB1 and are respectively marked as zeta x1 And ζ y1 ；
The measured x-axis coordinate and y-axis coordinate of the corresponding point ST1 are respectively differed from the x-axis coordinate and y-axis coordinate of the corresponding point WT1 and are respectively marked as zeta x2 And ζ y2 ；
Will ζ x1 And ζ x2 Making a difference and dividing ζ y1 And ζ y2 The difference is recorded as Δ ζ x 、Δζ y ；
Comparison Δ ζ x Tolerance of e to the x-axis x Relation of (1), Δ ζ y Tolerance of e to y-axis y The relationship of (1):
if Δ ζ x ≤ε x And Δ ζ y ≤ε y The immersed tube is accurately installed, and the accuracy of the mounting plane of the immersed tube is high;
if Δ ζ x ＞ε x And/or Δ ζ y ＞ε y The immersed tube is installed obliquely, and the accuracy of the installation plane of the immersed tube is low.
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2022
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