CN116518896A - Auxiliary measuring device and measuring method for steel pipes of pipe shed - Google Patents
Auxiliary measuring device and measuring method for steel pipes of pipe shed Download PDFInfo
- Publication number
- CN116518896A CN116518896A CN202310337964.4A CN202310337964A CN116518896A CN 116518896 A CN116518896 A CN 116518896A CN 202310337964 A CN202310337964 A CN 202310337964A CN 116518896 A CN116518896 A CN 116518896A
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- Prior art keywords
- pipe
- shed
- support
- tube
- steel pipe
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 150
- 239000010959 steel Substances 0.000 title claims abstract description 150
- 238000000034 method Methods 0.000 title claims description 18
- 238000005259 measurement Methods 0.000 claims abstract description 25
- 230000007423 decrease Effects 0.000 claims description 9
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 7
- 238000000691 measurement method Methods 0.000 abstract description 2
- 239000013049 sediment Substances 0.000 description 4
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 3
- 238000011179 visual inspection Methods 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C15/00—Surveying instruments or accessories not provided for in groups G01C1/00 - G01C13/00
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/25—Greenhouse technology, e.g. cooling systems therefor
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- A Measuring Device Byusing Mechanical Method (AREA)
Abstract
The invention relates to the technical field of tunnel construction equipment, and provides a measurement auxiliary device and a measurement method for a pipe-shed steel pipe, wherein the measurement auxiliary device for the pipe-shed steel pipe comprises a supporting pipe, a traction piece and a prism; the support pipe can be coaxially and slidably connected to the inside of the steel pipe of the pipe shed; the support tube has an opening along one end of its axis; the prism is arranged in the supporting tube; the prism faces the opening of the supporting tube; the traction piece is connected to one end of the opening of the support tube; the traction piece is used for dragging the supporting tube to move in the pipe shed steel pipe. The auxiliary measuring device for the steel pipe of the pipe shed can solve the problem of low measuring precision of the existing measuring means for the position of the steel pipe of the pipe shed.
Description
Technical Field
The invention relates to the technical field of tunnel construction equipment, in particular to an auxiliary measuring device and an auxiliary measuring method for a pipe shed steel pipe.
Background
In the existing tunnel construction process, soil in the line range is often required to be supported and reinforced by adopting a pipe shed; in the construction process of the tunnel, a supporting structure of the pipe shed is generally built through a plurality of pipe shed steel pipes longitudinally arranged along the line, and then tunnel excavation is carried out in a supporting range, so that accurate positioning of the pipe shed steel pipes has a critical influence on the construction accuracy of the tunnel, parameters such as an incidence angle, an interpolation deflection angle and the like of the pipe shed steel pipes are required to be accurately measured, so that the construction accuracy of the pipe shed is guaranteed, and the construction accuracy of the tunnel is further guaranteed.
However, no special equipment for measuring the positioning precision of the pipe shed steel pipe exists at present, when the pipe shed steel pipe is measured, a commonly used method is that an adhesion reflecting plate is arranged at one end of the inside of the pipe shed steel pipe, then a steel bar with a binding flashlight is inserted into the inside of the pipe shed steel pipe and pushes the flashlight to move along the pipe shed steel pipe, and the posture of the pipe shed steel pipe is determined by observing the luminous condition of the reflecting plate; however, as the steel bars can bend and shake, deviation exists between the posture of the flashlight and the posture of the steel pipe of the pipe shed, and further deviation is caused to the judgment of the posture of the steel pipe of the pipe shed; and the flashlight and the steel bar occupy a large amount of space in the steel tube of the pipe shed, thereby causing the situation that the reflecting sheet is difficult to visually confirm.
Disclosure of Invention
The invention aims at: the measuring auxiliary device and the measuring method for the steel pipe of the pipe shed are provided for solving the problem that the measuring precision of the existing measuring means for the position of the steel pipe of the pipe shed is low.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a measurement auxiliary device for a pipe shed steel pipe comprises a supporting pipe, a traction piece and a prism;
the support pipe can be coaxially and slidably connected to the inner wall of the steel pipe of the pipe shed; the support tube has an opening along one end of its axis;
the prism is arranged in the supporting tube; the prism faces the opening of the supporting tube;
the traction piece is connected to one end of the opening of the support tube; the traction piece is used for enabling the supporting tube to move in the pipe shed steel pipe.
The sliding connection between the support tube and the inside of the steel tube of the tube shed can be realized in various modes, such as clearance fit or pulley arranged on the outer wall of the support tube; the specific type of the prism in the supporting tube is determined according to actual requirements.
The traction piece can be in various forms, an integrated long rod or a spliced long rod, and can be used for traction of the support tube to move in the steel tube of the pipe shed.
When the steel pipe of the pipe shed is required to be measured, the supporting pipe is arranged inside the steel pipe of the pipe shed, and the supporting pipe is pushed to the tail end of the steel pipe of the pipe shed through other enough parts, such as reinforcing steel bars; if the traction piece is a hard part capable of being used for pushing the pipe shed steel pipe, the traction piece can be directly used for pushing the support pipe to the tail end of the pipe shed steel pipe; then erecting a total station at the head end of the pipe shed steel pipe and measuring the position information of the prism; in the measurement process, the supporting tube is dragged towards the head end of the pipe shed steel pipe through the traction piece, and the prism can be driven to move along the pipe shed steel pipe, so that the position information of each point on the pipe shed steel pipe can be measured through the total station, and the position information of the pipe shed steel pipe can be calculated.
Compared with the prior art, the supporting tube is directly connected in the pipe shed steel tube in a sliding manner, and one end of the supporting tube, which is not bound to the steel bar, is held by manpower, so that better coaxiality of the supporting tube relative to the pipe shed steel tube can be obtained, and further, the position information of the prism can be translated more accurately to the position information of the corresponding position on the pipe shed steel tube; the position information of the pipe shed steel pipe is obtained by matching the position of the total station measuring prism, so that the scheme has higher precision compared with the visual inspection in the existing scheme.
The tail end of the pipe shed steel pipe refers to one end of the pipe shed steel pipe facing the tunnel to be excavated.
As a preferable scheme of the invention, the outer wall of the supporting tube is provided with a plurality of supporting columns; the support column is arranged along the axial direction of the support tube; the support columns are distributed at intervals along the circumferential direction of the support tube.
The support column and the support tube can be integrated components or distributed independent components and are connected together in a threaded connection mode. The section of the support column along the length direction can be in various shapes, such as rectangle and circle, as long as the support tube can be supported inside the steel tube of the pipe shed; the specific length of the support column along the axial direction of the support tube is determined according to actual requirements, and the support tube can be reliably supported inside the steel tube of the tube shed, for example, the support tube can be arranged along the length direction of the support tube.
The technical proposal is that support columns are arranged on the outer wall of a support tube and are distributed at intervals along the circumferential direction of the support tube; when the traction support tube moves in the steel tube of the tube shed, if sediment exists in the steel tube of the tube shed, the sediment can reach the other side of the support tube through a gap between the support posts, and cannot be accumulated on the front side of the support tube and prevent or shade the prism from moving the support tube.
As a preferable scheme of the invention, the distance from one surface of the support column away from the support tube axis to the support tube axis is H; h decreases along the length direction of the support column towards the two ends of the support column.
The specific curve of H decreasing towards the two ends of the support column depends on actual demands, and can be stepwise decrease or gradual decrease, or can be a combination of stepwise decrease or gradual decrease, for example, H is kept unchanged towards the end of the support column along the length direction of the support column and then gradually decreases.
According to the scheme, even though the whole formed by combining the support column and the support tube is provided with the appearance with small two ends and large middle along the length direction of the support tube, the whole can better pass through the steel tube of the pipe shed, and is not easy to be blocked by foreign matters such as sediment.
As a preferable scheme of the invention, the absolute value of the slope of H decreasing along the length direction of the support column is K, and K is less than or equal to 0.2.
The present solution recommends a slope of H decrease, i.e., H decreases by 0.2m per 1m of movement along the length of the support column.
As a preferable scheme of the invention, the number of the support columns is greater than or equal to three.
The support column number has been recommended to this scheme, can reliably support the stay tube in the inner wall of pipe canopy steel pipe, guarantees the axiality of support column and pipe canopy steel pipe. .
As a preferred embodiment of the present invention, the support column and the support tube are welded together.
The connection mode of this scheme processing is simple, connects reliably.
As a preferable mode of the present invention, the traction member is a rope-shaped member.
Compared with hard components such as steel bars or steel pipes, the scheme is convenient to store, small in occupied area and easy to operate in a narrow space.
As a preferable mode of the invention, the traction piece is a steel wire rope.
Compared with other schemes, such as a scheme using a plastic rope or a nylon rope, the scheme is more wear-resistant, has stronger bearing capacity and is not easy to break.
As a preferable scheme of the invention, the length of the supporting tube is La; the outer diameter of the supporting tube is Da; la is more than or equal to 2Da and less than or equal to 3Da.
The proposal recommends the length of the supporting tube; under the length of this scheme, can not take place because support tube length is too short and lead to the stay tube to take place perpendicular to the circumstances of rolling of pipe canopy steel pipe axis under the pulling of external force in pipe canopy steel pipe inner wall to the angle that leads to the prism takes place deflection influence measurement accuracy.
As a preferable scheme of the invention, when the outer wall of the supporting tube is not provided with the supporting column, the outer diameter of the supporting tube is Da; the inner diameter of the steel pipe of the pipe shed is De; de-Da is less than or equal to 3mm and less than or equal to 5mm; when the outer wall of the supporting tube is provided with the supporting columns, the maximum width between each point on each supporting column is Dt, and De-Dt is more than or equal to 3mm and less than or equal to 5mm.
The proposal recommends the gap size between the outer wall of the supporting tube and the inner wall of the tube shed steel tube, or the side of the supporting column far away from the axis of the supporting tube and the inner wall of the tube shed steel tube.
The invention discloses a measuring method of a pipe shed steel pipe, which is applied to an auxiliary measuring device for the pipe shed steel pipe, and comprises the following steps of:
A. connecting a supporting tube to the inner wall of a steel tube of the tube shed; moving the supporting tube to the tail end of the pipe shed steel pipe; arranging a total station at the head end of the pipe shed steel pipe;
B. measuring a current position of a prism using the total station;
C. moving the supporting tube to the head end of the pipe shed steel pipe by a preset distance by using a traction piece;
D. repeating the steps B-C until the supporting tube moves to the head end of the pipe shed steel pipe; and (5) completing the measurement.
In the step A, the support pipe is moved to the tail end of the pipe shed steel pipe, and the support pipe can be pushed to the tail end of the pipe shed steel pipe through a steel bar or other long enough parts;
in the step C, the specific distance that the support tube moves towards the head end of the pipe shed steel pipe is determined according to actual conditions, and if a high-precision measurement result is required to be obtained, the distance of each movement is reduced; if the measurement operation needs to be simplified, the distance per movement can be increased.
The measuring method of the scheme is to measure the pipe-shed steel pipe by the auxiliary measuring device for the pipe-shed steel pipe and the total station, so that the measuring method has higher precision compared with the existing measuring method of the pipe-shed steel pipe.
In summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows:
1. when the scheme is used for measuring the steel pipe of the pipe shed, the supporting pipe is arranged inside the steel pipe of the pipe shed, and the supporting pipe is pushed to the tail end of the steel pipe of the pipe shed through other enough parts, such as reinforcing steel bars; if the traction piece is a hard part capable of being used for pushing the pipe shed steel pipe, the traction piece can be directly used for pushing the support pipe to the tail end of the pipe shed steel pipe; then erecting a total station at the head end of the pipe shed steel pipe and measuring the position information of the prism; in the measurement process, the supporting tube is dragged towards the head end of the pipe shed steel pipe through the traction piece, and the prism can be driven to move along the pipe shed steel pipe, so that the position information of each point on the pipe shed steel pipe can be measured through the total station, and the position information of the pipe shed steel pipe can be calculated.
Compared with the prior art, the supporting tube is directly connected in the pipe shed steel tube in a sliding manner, and one end of the supporting tube, which is not bound to the steel bar, is held by manpower, so that better coaxiality of the supporting tube relative to the pipe shed steel tube can be obtained, and further, the position information of the prism can be translated more accurately to the position information of the corresponding position on the pipe shed steel tube; the position information of the pipe shed steel pipe is obtained by matching the position of the total station measuring prism, so that the scheme has higher precision compared with the visual inspection in the existing scheme.
2. The measuring method of the scheme is to measure the pipe-shed steel pipe by the auxiliary measuring device for the pipe-shed steel pipe and the total station, so that the measuring method has higher precision compared with the existing measuring method of the pipe-shed steel pipe.
Drawings
FIG. 1 is a schematic perspective view of a measurement assisting apparatus for pipe-shed steel pipes according to the present invention;
FIG. 2 is a schematic side view of a measurement assisting apparatus for pipe-roof steel pipe of the present invention;
FIG. 3 is a schematic side sectional view showing a state of being mounted to a pipe-roof steel pipe of a measurement assisting apparatus for a pipe-roof steel pipe of the present invention;
icon: 1-a steel pipe of a pipe shed; 2-supporting the tube; 3-traction member; 4-prisms; 5-total station; 21-support columns.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Example 1
As shown in fig. 1 to 3, a measurement assisting apparatus for a steel pipe of a pipe shed, which is employed in the present embodiment, includes a support pipe 2, a traction member 3, and a prism 4; the support pipe 2 can coaxially slide and connect with the inside of the steel pipe 1 of the pipe shed; the support tube 2 has an opening along one end of its axis; the prism 4 is arranged in the support tube 2; the prism 4 faces the opening of the support tube 2; the traction piece 3 is connected with one end of the opening of the support tube 2; the traction piece 3 is used for dragging the support pipe 2 to move in the pipe shed steel pipe 1.
Specifically, as shown in fig. 3, the corresponding section of the pipe shed steel pipe 1 is circular, and the inner diameter de=159 mm, so as shown in fig. 2, the support pipe 2 is a cylindrical steel pipe with the outer diameter da=155 mm, and the outer wall of the support pipe 2 and the inner wall of the pipe shed steel pipe 1 are in clearance fit so as to be capable of sliding relatively; the length of the support tube 2 is 2-3 times of the diameter of the support tube 2, namely 310-465 mm.
The traction piece 3 is a steel wire rope and is connected to the lower side of one end part of the support pipe 2 along the length direction of the support pipe, so that when the support pipe 2 is installed on the pipe shed steel pipe 1, the steel wire rope does not shade the prism 4; the steel wire rope is specifically a soft and thin steel wire rope with the diameter of 1mm and the traction force of 20Kg, the specific length is selected according to actual requirements, and 100m is taken in the embodiment.
When the pipe shed steel pipe 1 needs to be measured, the supporting pipe 2 is installed inside the pipe shed steel pipe 1, and the supporting pipe 2 is pushed to the tail end of the pipe shed steel pipe 1 through other sufficiently long parts, such as reinforcing steel bars.
Then erecting an ATR total station 5 at the head end of the pipe shed steel pipe 1 and measuring the position information of the prism 4; in the measuring process, the supporting tube 2 is dragged towards the head end of the pipe shed steel tube 1 through the steel wire rope, and the prism 4 can be driven to move along the pipe shed steel tube 1, so that the position information of each point on the pipe shed steel tube 1 can be measured through the ATR total station 5, and the position information of the pipe shed steel tube 1 can be calculated.
Example 2
As shown in fig. 1 to 3, on the basis of embodiment 1, the outer wall of the support tube 2 is provided with a plurality of support columns 21; the support column 21 is arranged along the axial direction of the support tube 2; the support columns 21 are spaced apart in the circumferential direction of the support tube 2.
Specifically, the support column 21 is a cylindrical member welded to the outer wall of the support tube 2, has a diameter of 10mm and is equal in length to the support tube 2; correspondingly, the diameter of the supporting tube 2 is changed to 135mm, and the length is changed to 270-400 mm, so as to ensure that the overall outer diameter dt=155 mm of the measuring device of the embodiment is as shown in fig. 2, and the gap between the overall measuring device of the embodiment and the pipe-shed steel tube 1 is kept unchanged.
The support columns 21 of this embodiment are six in number, and each support column 21 is centrosymmetric about the axis of the support tube 2.
Chamfer angles are also provided at both ends of each support column 21, and as shown in fig. 2, the chamfer angles are α, tanα=0.2; therefore, the whole measuring device of the embodiment presents the appearance with reduced sizes at two ends, and the sediment and other obstacles in the pipe shed steel pipe 1 can be more easily passed through.
Example 3
A measurement method of a pipe-shed steel pipe, applied to any one of the measurement assisting apparatuses for a pipe-shed steel pipe of embodiments 1 to 2, comprising the steps of:
A. connecting a supporting tube 2 to the inner wall of a steel tube 1 of the pipe shed; moving the support pipe 2 to the tail end of the pipe shed steel pipe 1; a total station 5 is arranged at the head end of the pipe shed steel pipe 1;
specifically, when the support pipe 2 is moved to the tail end of the pipe shed steel pipe 1, the support pipe 2 is pushed to the tail end of the pipe shed steel pipe 1 by adopting ppr pipes with the diameter of 20mm, specifically, a plurality of sections of ppr pipes with the length of 3m are selected, and all ppr pipes are connected end to a sufficient length;
B. measuring the current position of the prism 4 using the total station 5;
C. a traction piece 3 is used for moving the support pipe 2 to the head end of the pipe shed steel pipe 1 by a preset distance;
specifically, in this embodiment, the preset distance is 1m.
D. Repeating the steps B-C until the supporting tube 2 moves to the head end of the pipe shed steel pipe 1; and (5) completing the measurement.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (10)
1. The auxiliary measuring device for the steel pipe of the pipe shed is characterized by comprising a supporting pipe (2), a traction piece (3) and a prism (4); the support tube (2) can be coaxially and slidably connected to the inner wall of the steel tube (1) of the pipe shed; the support tube (2) has an opening along one end of its axis; the prism (4) is arranged in the supporting tube (2); the prism (4) faces the opening of the support tube (2); the traction piece (3) is connected to one end of the opening of the supporting tube (2); the traction piece (3) is used for enabling the supporting tube (2) to move in the pipe shed steel pipe (1).
2. A measurement assisting device for a pipe-shed steel pipe according to claim 1, characterized in that the outer wall of the support pipe (2) is provided with several support columns (21); the support column (21) is arranged along the axial direction of the support tube (2); the support columns (21) are distributed at intervals along the circumferential direction of the support tube (2).
3. A measurement aid for pipe-shed steel pipes according to claim 2, characterized in that the side of the support column (21) remote from the axis of the support tube (2) is at a distance H from the axis of the support tube (2); h decreases toward both ends of the support column (21) along the length direction of the support column (21).
4. A measurement assisting apparatus for a pipe-shed steel pipe as claimed in claim 3, wherein,
the absolute value of the slope of H decreasing along the length direction of the support column (21) is K, and K is less than or equal to 0.2.
5. A measurement aid for pipe-shed steel pipes according to claim 2, characterized in that the number of support columns (21) is greater than or equal to three.
6. A measurement aid for pipe-shed steel pipes according to claim 2, characterized in that the support column (21) and the support pipe (2) are welded.
7. A measurement aid for pipe-shed steel pipes according to any of claims 1-6, characterized in that the traction element (3) is a rope-like element.
8. A measurement aid for pipe-shed steel pipes according to any of claims 1 to 6, characterized in that the length of the support pipe (2) is La; the outer diameter of the supporting tube (2) is Da;
2Da≤La≤3Da。
9. a measurement aid for pipe-shed steel pipes according to any of claims 1-6, characterized in that the outer diameter of the support pipe (2) is Da when the support column (21) is not provided on the outer wall of the support pipe (2); the inner diameter of the pipe shed steel pipe (1) is De; de-Da is less than or equal to 3mm and less than or equal to 5mm; when the outer wall of the supporting tube (2) is provided with the supporting columns (21), the maximum width between each two points on each supporting column (21) is Dt, and De-Dt is more than or equal to 3mm and less than or equal to 5mm.
10. A method for measuring a pipe-shed steel pipe, characterized by being applied to a measurement assisting apparatus for a pipe-shed steel pipe as claimed in any one of claims 1 to 9, comprising the steps of:
A. connecting a supporting tube (2) to the inner wall of a steel tube (1) of the pipe shed; moving the support tube (2) to the tail end of the pipe shed steel pipe (1); a total station (5) is arranged at the head end of the pipe shed steel pipe (1);
B. measuring the current position of the prism (4) using the total station (5);
C. moving the supporting tube (2) to the head end of the pipe shed steel pipe (1) by a preset distance by using a traction piece (3);
D. repeating the steps B-C until the supporting tube (2) moves to the head end of the pipe shed steel pipe (1); and (5) completing the measurement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310337964.4A CN116518896A (en) | 2023-03-31 | 2023-03-31 | Auxiliary measuring device and measuring method for steel pipes of pipe shed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310337964.4A CN116518896A (en) | 2023-03-31 | 2023-03-31 | Auxiliary measuring device and measuring method for steel pipes of pipe shed |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116518896A true CN116518896A (en) | 2023-08-01 |
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ID=87391215
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310337964.4A Pending CN116518896A (en) | 2023-03-31 | 2023-03-31 | Auxiliary measuring device and measuring method for steel pipes of pipe shed |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116518896A (en) |
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2023
- 2023-03-31 CN CN202310337964.4A patent/CN116518896A/en active Pending
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