CN113737587A - Method for rechecking falling plate of shield tunnel prefabricated track plate - Google Patents
Method for rechecking falling plate of shield tunnel prefabricated track plate Download PDFInfo
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- CN113737587A CN113737587A CN202111091507.9A CN202111091507A CN113737587A CN 113737587 A CN113737587 A CN 113737587A CN 202111091507 A CN202111091507 A CN 202111091507A CN 113737587 A CN113737587 A CN 113737587A
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- 238000000034 method Methods 0.000 title claims abstract description 46
- 238000010276 construction Methods 0.000 claims abstract description 24
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 20
- 239000010959 steel Substances 0.000 claims abstract description 20
- 238000005259 measurement Methods 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 241001442234 Cosa Species 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 7
- 239000000463 material Substances 0.000 abstract description 4
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000013440 design planning Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B35/00—Applications of measuring apparatus or devices for track-building purposes
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B1/00—Ballastway; Other means for supporting the sleepers or the track; Drainage of the ballastway
- E01B1/002—Ballastless track, e.g. concrete slab trackway, or with asphalt layers
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01H—STREET CLEANING; CLEANING OF PERMANENT WAYS; CLEANING BEACHES; DISPERSING OR PREVENTING FOG IN GENERAL CLEANING STREET OR RAILWAY FURNITURE OR TUNNEL WALLS
- E01H1/00—Removing undesirable matter from roads or like surfaces, with or without moistening of the surface
- E01H1/005—Mobile installations, particularly for upkeeping in situ road or railway furniture, for instance road barricades, traffic signs; Mobile installations particularly for upkeeping tunnel walls
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention relates to the technical field of subway construction, and discloses a rechecking method for a shield tunnel prefabricated track slab falling plate, which comprises the following steps of: carrying out three-dimensional measurement scanning on the inner wall of the tunnel; generating a three-dimensional graph of the inner wall of the tunnel so as to obtain coordinates of each point of the inner wall of the tunnel; inputting the coordinate of the point O in the top rail connecting line of any two steel rails and the vertical distance h1 from the top rail connecting line to the bottom of the prefabricated rail plate, and calculating to obtain the coordinate of the point C in the bottom of the prefabricated rail plate; inquiring and obtaining a left intersection point A1 and a right intersection point A2 of the plane where the plate bottom of the prefabricated track plate is located and the inner wall of the tunnel through the three-dimensional scanning result; comparing the slab bottom width L of the prefabricated track slab with the length of a connecting line A1C and A2C, and judging whether the prefabricated track slab can be normally hoisted to be a slab; the method can quickly and efficiently recheck the condition whether each position of the existing tunnel has the condition of laying the prefabricated track plate, has simple process, increases the construction efficiency and is convenient for material preparation during track laying.
Description
Technical Field
The invention relates to the technical field of subway construction, in particular to a rechecking method for a shield tunnel prefabricated track slab falling plate.
Background
At present, the rails are important components of subways or high-speed railways, which directly bear the train load and transfer it to an off-line foundation. With the improvement of the technological capability of equipment in China, the assembly type construction technology has the advantages of high construction efficiency, high precision, environment-friendly field operation and the like, and the assembly type prefabricated rail is popularized and applied to high-speed railways and subways in various cities on a large scale at present.
The laying modes of the high-speed railway and the subway comprise an overhead mode, a ground mode and an underground mode. When the urban area is passed through, the underground laying mode is generally adopted, and the urban area is limited by ground conditions. The inner diameter R of the underground circular tunnel is generally 2.7-3 m, the limit is short, and the tunneling route of the shield tunnel and the design planning route often have a certain degree of horizontal or vertical deviation under the influence of unfavorable geological conditions and the technical level of construction operators during construction. When the prefabricated track slab hoisting drop plate is in place, the line plane is required to be used as a reference for positioning, and the position of the line plane cannot be adjusted, so that the track slab of the prefabricated assembly track and the position of a tunnel segment conflict and the drop plate cannot be hoisted normally when the shield construction deviation is overlarge. In addition, during construction, due to the influence of segment assembling construction errors and peripheral geological conditions, the shield tunnel often has a certain ellipse change, namely the cross section of the tunnel is not circular but elliptical. If the on-site shield tunnel is in an oval shape with a sharp upper end, a sharp lower end and a narrow left end and a narrow right end, the transverse clearance at the bottom of the prefabricated track slab can be reduced, and the normal slab falling of the prefabricated track slab can be influenced.
At present, a reliable and efficient method for rechecking the falling plate of the shield tunnel prefabricated track plate is not available in the industry. For the section with larger tunnel driving deviation or larger ellipse variation degree of the shield tunnel, from the conservative angle, the assembly type prefabricated track is generally directly adjusted to a cast-in-place track to avoid the problem. Because the prefabricated track plate can not be accurately judged whether to fall down, a large number of prefabricated tracks can be directly adjusted to be cast-in-place tracks, so that the construction process of the prefabricated track bed and the cast-in-place track bed is frequently switched, the construction efficiency is reduced, and great inconvenience is brought to material preparation during track laying.
Disclosure of Invention
The purpose of the invention is: the method for rechecking the falling plate of the prefabricated track plate of the shield tunnel has the advantages that after the inner wall of the tunnel is subjected to three-dimensional measurement scanning, other tools are not needed, whether the conditions for paving the prefabricated track plate exist in each position of the existing tunnel or not can be rechecked quickly and efficiently, the process is simple, the construction efficiency is improved, and material preparation during track paving is facilitated.
In order to achieve the aim, the invention provides a method for rechecking a slab of a shield tunnel prefabricated track slab, which comprises the following steps of:
carrying out three-dimensional measurement scanning on the inner wall of the tunnel;
generating a three-dimensional graph of the tunnel inner wall so as to obtain coordinates of each point of the tunnel inner wall;
inputting the coordinate of a point O in the top rail connecting line of any two steel rails and the vertical distance h1 from the top rail connecting line to the bottom of the prefabricated rail plate, and calculating to obtain the coordinate of a point C in the bottom of the prefabricated rail plate;
inquiring and obtaining a left intersection point A1 and a right intersection point A2 of the plane where the plate bottom of the prefabricated track plate is located and the inner wall of the tunnel through the result of the three-dimensional measurement scanning;
and comparing the slab bottom width L of the prefabricated track slab with the length of a connecting line A1C and A2C, and judging whether the prefabricated track slab can be normally hoisted to fall.
Compared with the prior art, the rechecking method for the shield tunnel prefabricated track slab falling plate has the beneficial effects that: determining the position and the coordinate of each point of the inner wall of the tunnel by performing three-dimensional measurement scanning on the inner wall of the tunnel to obtain the coordinate of the intersection point of the plane where the bottom of the prefabricated track slab is located and the inner wall of the tunnel and the coordinate of the center of the bottom of the prefabricated track slab, calculating the length of the connecting line of the intersection point and the center point, and comparing the length with the width of the bottom of the prefabricated track slab to obtain whether the current position has enough width for the slab falling of the prefabricated track slab; the method is used for completing the tunnel, can quickly perform three-dimensional measurement scanning on the inner wall of the tunnel in the stage of not starting track laying without using other tools, can quickly and efficiently recheck the condition whether each position of the existing tunnel has the prefabricated track plate laying condition, quickly and accurately judges whether the prefabricated track plate at any mileage can normally hoist the falling plate on the inner wall of the tunnel, has simple process, increases the construction efficiency, and is convenient for material preparation during track laying.
The method for rechecking the slab falling plate of the shield tunnel prefabricated track slab provided by the embodiment of the invention comprises the following steps of when the coordinate of the slab bottom center C point of the prefabricated track slab is calculated and obtained in the curve section of the inner wall of the tunnel: and obtaining an included angle a between a steel rail top rail connecting line and a horizontal line through the numerical value h that the outer steel rail top is higher than the inner steel rail top, and obtaining the coordinate of the point C through the angle a.
According to the method for rechecking the falling plate of the shield tunnel prefabricated track plate, the coordinates of the point O are (x0, y0), the length of a top rail connecting line of the two steel rails is L1, the angle of the point a is arcsin (h/L1), and the coordinates of the point C are (x0 +/-h 1sina, y 0-h 1 cosa).
According to the method for rechecking the shield tunnel prefabricated track slab falling plate, provided by the embodiment of the invention, the data of the C point coordinate and the included angle a are input into the three-dimensional graph, so that the coordinates (x1 and y1) of the left intersection point A1 and the coordinates (x2 and y2) of the right intersection point A2 are obtained.
The method for rechecking the falling plate of the shield tunnel prefabricated track plate comprises the following steps of comparing the plate bottom width L of the prefabricated track plate with the lengths of connecting lines A1C and A2C: calculating the lengths of A1C and A2C, wherein the length of A1C is
A2C has a length of
According to the method for rechecking the slab falling plate of the shield tunnel prefabricated track slab, the length L1 of the top rail connecting line of the two steel rails is 1500 mm.
The method for rechecking the falling plate of the shield tunnel prefabricated track plate comprises the following steps of comparing the plate bottom width L of the prefabricated track plate with the lengths of connecting lines A1C and A2C: determine the sizes of A1C and L/2 and determine the sizes of A2C and L/2.
According to the method for rechecking the falling plate of the shield tunnel prefabricated track plate, provided by the embodiment of the invention, construction allowance L2 needs to be left between the prefabricated track plate and the inner wall of the tunnel, and the condition that the falling plate can be normally hoisted by judging that A1C is more than or equal to L/2+ L2 and A2C is more than or equal to L/2+ L2 is met.
According to the method for rechecking the falling plate of the shield tunnel prefabricated track plate, disclosed by the embodiment of the invention, the construction allowance L2 is 45-55 mm.
The method for rechecking the prefabricated track slab falling plate of the shield tunnel of the embodiment of the invention also comprises the following steps before the three-dimensional measurement scanning is carried out on the inner wall of the tunnel: and after the construction of the inner wall of the tunnel is finished, cleaning sundries and accumulated water on the inner wall of the tunnel.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a schematic structural diagram of a tunnel inner wall in a method for rechecking a prefabricated track slab falling slab of a shield tunnel according to an embodiment of the present invention;
fig. 2 is a flow chart of a method for rechecking a shield tunnel prefabricated track slab falling plate according to an embodiment of the present invention.
In the figure, 1, the inner wall of the tunnel; 2. prefabricating a track slab; 3. a steel rail.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
As shown in fig. 1, a method for rechecking a slab of a shield tunnel prefabricated track slab 2 according to a preferred embodiment of the present invention includes the following steps:
s1: carrying out three-dimensional measurement scanning on the inner wall 1 of the tunnel;
in some embodiments of the present invention, before step S1, the method further includes the following steps: collect the plane and vertical profile data of the circuit.
In some embodiments of the present invention, before step S1, the method further includes the following steps: after the construction of the tunnel inner wall 1 is finished, sundries and accumulated water are cleaned from the tunnel inner wall 1, and the influence of the sundries and the accumulated water in the tunnel on a three-dimensional measurement scanning result is prevented.
In some embodiments of the present invention, in S1, a three-dimensional measurement scanning process of the tunnel inner wall 1 is adopted, coordinates of the centerline of the designed line are taken as a reference, and the collection and positioning of the three-dimensional coordinates are completed by the three-dimensional scanner traveling in the tunnel.
S2: generating a three-dimensional graph of the tunnel inner wall 1 so as to obtain coordinates of each point of the tunnel inner wall 1; after scanning is finished, the coordinates of any point of the tunnel inner wall 1 corresponding to any mileage position can be quickly inquired according to the generated geometric figure of the tunnel inner wall 1 and the positioning of each point.
S3: inputting the coordinate of the point O in the top rail connecting line of any two steel rails 3 and the vertical distance h1 from the top rail connecting line to the bottom of the prefabricated rail plate 2, and calculating to obtain the coordinate of the point C in the bottom of the prefabricated rail plate 2;
in some embodiments of the present invention, when the tunnel inner wall 1 is a straight line segment, the point C is located directly below the point O, and the coordinates of the point O are (x0, y0), and the coordinates of the point C are (x0, y 0-h 1).
As shown in fig. 1 and 2, in some embodiments of the present invention, in a curve segment of a tunnel inner wall 1, in order to overcome the influence of a subway centrifugal force, the preset heights of rails on two sides are not consistent, and when a coordinate of a point C at the bottom center of a prefabricated track slab 2 is obtained through calculation, an included angle a between a top rail connecting line of a steel rail 3 and a horizontal line needs to be obtained through a value h that the top of an outer steel rail is higher than that of an inner steel rail, and then the coordinate of the point C is obtained through an angle a. The method is used for calculating the inner wall of the curve section track, the coordinate of the point C is obtained through angle conversion, and the result is accurate.
As shown in fig. 1 and 2, in some embodiments of the present invention, the coordinate of the point O is (x0, y0), the length of the top rail connecting line of the two steel rails 3 is L1, and the included angle formed between L1 and h is a, so that a is arcsin (h/L1), the distance between the point C and the point O is h1sina in the x direction, and the distance between the point C and the point O is h1a in the y direction, so that the calculated coordinate of the point C is (x0 ± h1sina, y 0-h 1cosa), and the calculated coordinate of the point C is obtained according to the calculated coordinate of the point C.
In some embodiments of the invention, the length L1 of the top rail connecting line of the two steel rails 3 is 1500mm, so the angle of a is arcsin (h/1500).
S4: the left intersection point A1 and the right intersection point A2 of the plane where the bottom of the prefabricated track slab 2 is located and the tunnel inner wall 1 are obtained through three-dimensional measurement scanning result query, the information of the section where the intercepted O point is located can be quickly obtained due to the fact that the inner wall of the track is subjected to three-dimensional scanning in the prior art, then the coordinates of the left intersection point A1 and the A2 are queried through known information and used for calculation and comparison of the next step, the method is convenient and fast, data are accurate, and rechecking efficiency is improved;
as shown in fig. 1 and 2, in some embodiments of the present invention, after determining the coordinates of the center C point of the slab bottom of the prefabricated track slab 2 and the angle of the included angle a between the slab bottom of the prefabricated track slab 2 and the horizontal plane, in combination with the geometry of the tunnel inner wall 1 automatically generated after the scanning measurement is completed, the coordinates of the intersection points a1 and a2 between the plane where the slab bottom of the track slab is located and the tunnel inner wall 1 can be quickly read; specifically, the data of the coordinates of the point C and the included angle a are input into the three-dimensional graph, and the coordinates (x1, y1) of the left intersection a1 and the coordinates (x2, y2) of the right intersection a2 are obtained.
S5: and comparing the slab bottom width L of the prefabricated track slab 2 with the length of a connecting line A1C and A2C, and judging whether the prefabricated track slab 2 can be normally hoisted to fall the slab.
In some embodiments of the present invention, in S5, the length of the connection line between A1C and A2C is calculated, and by comparing A1C and A2C with L/2, L/2 represents the half length of the prefabricated slab base, A1C represents the distance from the center of the slab base of the prefabricated track slab 2 to the tunnel inner wall 1, and when the distances from both sides of the center of the slab base of the prefabricated track slab 2 to the tunnel inner wall 1 are greater than half of the length of the prefabricated slab base, that is, A1C is greater than or equal to L/2 and A2C is greater than or equal to L/2, it can be determined that there is enough space for the prefabricated track slab 2 to fall.
As shown in fig. 1 and 2, in some embodiments of the present invention, when the tunnel inner wall 1 is a straight line segment, the point C is located directly below the point O, and the intersection points of the point C and the two sides are located on the same horizontal plane, where a distance A1C from the tunnel inner wall 1 on one side is (x 0-x 1), and a distance A2C from the tunnel inner wall 1 on the other side is (x 2-x 0).
As shown in fig. 1 and 2, in some embodiments of the present invention, when the inner wall 1 of the tunnel is a curved section, comparing the width L of the bottom of the prefabricated track slab 2 with the length of the line connecting A1C and A2C includes calculating the lengths of A1C and A2C, where the coordinate of the point C is (x0 ± h1sina, y 0-h 1cosa), and calculating the length of A1C to be (A1 + h1) cosa
A2C has a length of
As shown in fig. 1 and 2, in some embodiments of the present invention, from a practical engineering point of view, a construction margin L2 is required between the prefabricated track slab 2 and the tunnel inner wall 1 to allow enough space for the slab dropping process. Further, the judgment that the prefabricated track slab 2 can be normally hoisted to fall the slab meets the requirements that A1C is more than or equal to L/2+ L2 and A2 is more than or equal to L/2+ L2.
In some embodiments of the invention, the construction margin L2 is 45mm to 55 mm. Preferably, the construction allowance L2 is 50 mm.
The process of the invention is as follows: the method comprises the steps of determining the position and the coordinate of each point of the tunnel inner wall 1 by carrying out three-dimensional measurement scanning on the tunnel inner wall 1, obtaining the coordinate of the intersection point of the plane where the bottom of the prefabricated track slab 2 is located and the tunnel inner wall 1, also obtaining the coordinate of the center of the bottom of the prefabricated track slab 2, obtaining the length of a connecting line between the intersection point and the center point by calculating, and comparing the length with the width of the bottom of the prefabricated track slab 2 to know whether the current position has enough width for the slab falling of the prefabricated track slab 2.
To sum up, the embodiment of the invention provides a method for rechecking a slab falling plate of a prefabricated track plate 2 of a shield tunnel, which is used for rechecking whether each position of the existing tunnel has the condition of laying the prefabricated track plate 2 or not quickly and efficiently without other tools after the inner wall 1 of the tunnel is scanned by three-dimensional measurement in the stage of completion and non-start of track laying.
The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (10)
1. A method for rechecking a slab falling plate of a shield tunnel prefabricated track slab is characterized by comprising the following steps of:
carrying out three-dimensional measurement scanning on the inner wall of the tunnel;
generating a three-dimensional graph of the tunnel inner wall so as to obtain coordinates of each point of the tunnel inner wall;
inputting the coordinate of a point O in the top rail connecting line of any two steel rails and the vertical distance h1 from the top rail connecting line to the bottom of the prefabricated rail plate, and calculating to obtain the coordinate of a point C in the bottom of the prefabricated rail plate;
inquiring and obtaining a left intersection point A1 and a right intersection point A2 of the plane where the plate bottom of the prefabricated track plate is located and the inner wall of the tunnel through the result of the three-dimensional measurement scanning;
and comparing the slab bottom width L of the prefabricated track slab with the length of a connecting line A1C and A2C, and judging whether the prefabricated track slab can be normally hoisted to fall.
2. The method for rechecking the slab of the shield tunnel prefabricated track slab as claimed in claim 1, wherein when the coordinates of the slab bottom center C of the prefabricated track slab are calculated and obtained in the curve segment of the inner wall of the tunnel, the method comprises: and obtaining an included angle a between a connecting line of the steel rail top rail and the horizontal line by the numerical value h that the top of the outer steel rail is higher than that of the inner steel rail, and obtaining the coordinate of the point C by the angle of the included angle a.
3. The method for rechecking the slab of the shield tunnel prefabricated track slab as claimed in claim 2, wherein: the coordinates of the point O are (x0, y0), the length of a top rail connecting line of the two steel rails is L1, the angle of the included angle a is arcsin (h/L1), and the coordinates of the point C are (x0 +/-h 1sina, y 0-h 1 cosa).
4. The method for rechecking the slab of the shield tunnel prefabricated track slab as claimed in claim 3, wherein: and inputting the data of the coordinates of the point C and the included angle a into the three-dimensional graph to obtain the coordinates (x1, y1) of the left intersection A1 and the coordinates (x2, y2) of the right intersection A2.
5. The method for rechecking a shield tunnel prefabricated track slab falling slab of claim 4, wherein comparing the slab bottom width L of the prefabricated track slab with the length of a line A1C and A2C comprises: calculating the lengths of A1C and A2C, wherein the length of A1C is
A2C has a length of
6. The method for rechecking the slab of the shield tunnel prefabricated track slab as claimed in claim 3, wherein: the length L1 of the top rail connecting line of the two steel rails is 1500 mm.
7. The method for rechecking a shield tunnel prefabricated track slab falling plate according to claim 1 or 4, wherein the step of comparing the slab bottom width L of the prefabricated track slab with the length of a line A1C and A2C comprises: determine the sizes of A1C and L/2 and determine the sizes of A2C and L/2.
8. The rechecking method for the shield tunnel prefabricated track plate falling plate according to claim 7, characterized in that a construction margin L2 is required to be left between the prefabricated track plate and the tunnel inner wall, and the requirement that A1C is more than or equal to L/2+ L2 and A2C is more than or equal to L/2+ L2 is met when the prefabricated track plate can be normally hoisted and the falling plate is judged.
9. The method for rechecking the shield tunnel prefabricated track slab falling plate as claimed in claim 8, wherein the construction margin L2 is 45 mm-55 mm.
10. The method for rechecking the prefabricated track slab of the shield tunnel according to claim 1, further comprising the following steps before the three-dimensional measurement scanning of the inner wall of the tunnel: and after the construction of the inner wall of the tunnel is finished, cleaning sundries and accumulated water on the inner wall of the tunnel.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111091507.9A CN113737587A (en) | 2021-09-16 | 2021-09-16 | Method for rechecking falling plate of shield tunnel prefabricated track plate |
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| CN202111091507.9A CN113737587A (en) | 2021-09-16 | 2021-09-16 | Method for rechecking falling plate of shield tunnel prefabricated track plate |
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Application publication date: 20211203 |