CN114199125A - Method for measuring plane position of original bridge in expanded bridge - Google Patents
Method for measuring plane position of original bridge in expanded bridge Download PDFInfo
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- CN114199125A CN114199125A CN202111391079.1A CN202111391079A CN114199125A CN 114199125 A CN114199125 A CN 114199125A CN 202111391079 A CN202111391079 A CN 202111391079A CN 114199125 A CN114199125 A CN 114199125A
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- 238000000034 method Methods 0.000 title claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 230000002787 reinforcement Effects 0.000 claims 2
- 238000013461 design Methods 0.000 abstract description 7
- 238000005259 measurement Methods 0.000 description 10
- 238000010276 construction Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 4
- 238000013507 mapping Methods 0.000 description 2
- 238000013102 re-test Methods 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
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- 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
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Abstract
The invention discloses a method for measuring the plane position of an original bridge in an expanded bridge, which comprises the following steps: measuring the abscissa and the ordinate of each vertex of two end faces of each bent cap of the original bridge under the same origin coordinate system, and calculating to obtain the plane position of each bent cap; and measuring the abscissa and the ordinate of any three points of each pile of the original bridge on the same horizontal plane, and calculating to obtain the plane position of each pile. The method has the advantages of quickly, accurately and reliably positioning the plane position of the original bridge, overcoming the position deviation of the original bridge and providing a design reference for expanding the bridge.
Description
Technical Field
The invention relates to the technical field of expansion bridge control. More specifically, the invention relates to a method for measuring the plane position of an original bridge in an extension bridge.
Background
Along with the rapid development of roads, a plurality of old bridges cannot meet the traffic volume of the existing vehicles, and need to be expanded, and the expansion principle generally requires that the structures of the expanded bridges and the original bridges are uniform, the operation is convenient, the bridges are safe and durable, and the like. In the process of expanding the bridge, construction drawings and coordinate positions of the original bridge are usually obtained from a database, and the position of the expanded bridge is located based on the construction drawings and the coordinate positions.
Disclosure of Invention
An object of the present invention is to solve at least the above problems and to provide at least the advantages described later.
The invention also aims to provide a method for measuring the plane position of the original bridge in the expanded bridge, which can quickly, accurately and reliably position the plane position of the original bridge, overcome the position deviation of the original bridge and provide a design reference for the expanded bridge.
To achieve these objects and other advantages in accordance with the present invention, there is provided a method for measuring a plane position of an original bridge in an extension bridge, comprising the steps of:
measuring the abscissa and the ordinate of each vertex of two end faces of each bent cap of the original bridge under the same origin coordinate system, and calculating to obtain the plane position of each bent cap;
and measuring the abscissa and the ordinate of any three points of each pile of the original bridge on the same horizontal plane, and calculating to obtain the plane position of each pile.
Preferably, the abscissa and ordinate of each vertex of both end surfaces of each cap beam of the existing bridge and the abscissa and ordinate of any three points of each pile on the same horizontal plane are measured with the control point as a reference.
Preferably, the prism-free total station is adopted to measure the abscissa and ordinate of each vertex of two end faces of each capping beam of the original bridge and the abscissa and ordinate of any three points of each pile on the same horizontal plane.
Preferably, when the prism-free total station cannot observe the point to be measured on land, the prism-free total station is supported above the water surface below the original bridge by using a fixing support, wherein the fixing support comprises:
the fixed ring sleeve is formed by hinging two half ring sleeves, the other sides of the two half ring sleeves are detachably connected, the inner surfaces of the half ring sleeves are sequentially laid with an air bag and an anti-skid layer, the air bag is inflated, and the anti-skid layer is abutted against the side wall of one pile column of the original bridge;
one end of the supporting plate is fixed on the hinged end of the semi-ring sleeve, the other end of the supporting plate is suspended in the air, a through hole and a winch are arranged on the supporting plate, and fixing rods are arranged on the supporting plate and positioned around the through hole;
the fixed pulley is arranged above the through hole through a support, a rope is wound on the fixed pulley, one end of the rope is fixed on the winch, and a hook is arranged at the other end of the rope;
the hoist crane comprises a hoisting frame, wherein a hoisting rope is arranged on the hoisting frame, a hanging ring is arranged on the hoisting rope, the hanging ring is hung on the hook, the size of the hoisting frame is smaller than that of the through hole, a plurality of locking pieces are arranged on the hoisting frame, and when the hoist crane passes through the rope, the hoisting frame is lifted to the position above the supporting plate, the locking pieces are locked on the fixing rods.
Preferably, the fixing bracket further comprises a pair of inflation pumps, and the pair of inflation pumps are respectively fixed on the outer side walls of the two half-ring sleeves.
Preferably, the fixed bolster still includes fixed strengthening mechanism, fixed strengthening mechanism including the interval set up in a plurality of electric jar on the half ring cover lateral wall, one end is fixed in the pole that butts on the removal end of electric jar, be fixed in the slipmat on the pole that butts the other end, wherein, the pole that butts has the axial setting of the one end slope of slipmat towards the half ring cover, when the removal end of electric jar is outwards stretched out before its rated distance, the slipmat butt in on the lateral wall of stake.
The utility model provides a measuring device for assisting original bridge plane position in enlargement bridge, including exempting from prism total powerstation and fixed bolster, the fixed bolster includes:
the fixed ring sleeve is formed by hinging two half ring sleeves, the other sides of the two half ring sleeves are detachably connected, the inner surfaces of the half ring sleeves are sequentially laid with an air bag and an anti-skid layer, the air bag is inflated, and the anti-skid layer is abutted against the side wall of one pile column of the original bridge;
one end of the supporting plate is fixed on the hinged end of the semi-ring sleeve, the other end of the supporting plate is suspended in the air, a through hole and a winch are arranged on the supporting plate, and fixing rods are arranged on the supporting plate and positioned around the through hole;
the fixed pulley is arranged above the through hole through a support, a rope is wound on the fixed pulley, one end of the rope is fixed on the winch, and a hook is arranged at the other end of the rope;
the hoist crane comprises a hoisting frame, wherein a hoisting rope is arranged on the hoisting frame, a hanging ring is arranged on the hoisting rope, the hanging ring is hung on the hook, the size of the hoisting frame is smaller than that of the through hole, a plurality of locking pieces are arranged on the hoisting frame, and when the hoist crane passes through the rope, the hoisting frame is lifted to the position above the supporting plate, the locking pieces are locked on the fixing rods.
The application of the measuring method in bridge expansion is provided.
The invention at least comprises the following beneficial effects: the measuring method can quickly, accurately and reliably position the plane position of the original bridge, overcomes the position deviation of the original bridge and provides a design reference for expanding the bridge.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
Fig. 1 is a top view of the fixing bracket according to one embodiment of the present invention;
FIG. 2 is a side view of the mounting bracket according to one embodiment of the present invention;
fig. 3 is a schematic position diagram of capping beams and piles of new and old bridges according to one embodiment of the present invention.
Detailed Description
The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.
It is to be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials, if not otherwise specified, are commercially available; in the description of the present invention, the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings only for the convenience of description and simplification of description, and do 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.
As shown in fig. 1 to 3, the present invention provides a method for measuring an original bridge plane position in an extension bridge, comprising the following steps:
measuring the abscissa and the ordinate of each vertex of two end faces of each bent cap of the original bridge under the same origin coordinate system, and calculating to obtain the plane position of each bent cap;
and measuring the abscissa and the ordinate of any three points of each pile of the original bridge on the same horizontal plane, and calculating to obtain the plane position of each pile.
The key position points for positioning the original bridge are obtained in the process of continuously searching for the extension bridge, and for the original bridge, construction reference can be provided for the later-stage extension bridge as long as the plane positions of the cover beam and the pile are accurately positioned, so that the horizontal coordinates and the vertical coordinates of the vertexes of the two end surfaces of the cover beam are measured under the same original point coordinate system by a surveying and mapping method, and the points positioned under the same vertical surface are averaged to obtain the plane position of the cover beam. And measuring the abscissa and the ordinate of any three points of the pile on the same horizontal plane under the original point coordinate system, obtaining the plane circle position of the pile based on a calculation formula of the three-point circle, drawing the plane circle position on the same drawing, and conveniently drawing the design size of the expanded bridge so as to calculate the coordinates of the expanded bridge. By the measuring method, the defects that the original bridge possibly has construction errors and settlement errors can be overcome, and the whole original bridge is not required to be subjected to surveying and mapping again by spending a large amount of manpower and time, so that the engineering progress is not influenced.
In another technical scheme, the control points are used as reference, and the abscissa and ordinate of each vertex of two end faces of each capping beam of the original bridge and the abscissa and ordinate of any three points of each pile on the same horizontal plane are measured. The control point is the position reference of the whole building network in road and bridge construction, and the coordinate position of the control point is known and fixed, so that the alignment of the position of the measurement origin is convenient by taking the control point as the reference for measurement, and the measurement efficiency is improved.
In another technical scheme, a prism-free total station is adopted to measure the abscissa and ordinate of each vertex of two end faces of each bent cap of the original bridge and the abscissa and ordinate of any three points of each pile on the same horizontal plane. Compared with a common total station, the prism-free total station refers to a prism-free total station, namely the total station can measure distance without aiming at special reflection tools such as a reflection prism and a reflection sheet, and for a bridge, the reflection prism and the reflection sheet are not conveniently placed at most of pile columns and cover beams, so that the prism-free total station is more convenient to measure, and the measurement efficiency can be improved.
In another technical scheme, the method further comprises the step of supporting the prism-free total station above a water surface below an original bridge by using a fixed support when the prism-free total station cannot observe a point to be measured on land, wherein the fixed support comprises:
the fixed ring sleeve 1 is formed by hinging two half ring sleeves 11, the other sides of the two half ring sleeves 11 are detachably connected, an air bag 12 and an anti-skid layer 13 are sequentially laid on the inner surface of each half ring sleeve 11, the air bag 12 is inflated, and the anti-skid layer 13 is abutted against the side wall of one pile of the original bridge;
one end of the supporting plate 2 is fixed on the hinged end of the semi-ring sleeve 11, the other end of the supporting plate is suspended, a through hole 21 and a winch 22 are arranged on the supporting plate 2, and fixing rods 23 are arranged on the supporting plate 2 and positioned around the through hole 21;
a fixed pulley 24 disposed above the through hole 21 through a bracket 25, a rope 26 wound on the fixed pulley 24, one end of the rope 26 being fixed to the hoist 22, and the other end thereof being provided with a hook 27;
hanging frame 3 is equipped with lifting rope 31 on it, be equipped with link 32 on the lifting rope 31, link 32 articulate in on the couple 27, hanging frame 3's size is less than the size of perforating hole 21, be equipped with a plurality of retaining members 33 on hanging frame 3, wherein, work as hoist engine 22 passes through rope 26 will hanging frame 3 promotes to when backup pad 2 top, retaining member 33 lock in on dead lever 23.
For an extra-large bridge, the length of the extra-large bridge is more than 500m, the coordinates of the end face of the cover beam positioned in the middle part are difficult to predict, survey personnel and survey instruments are usually transported to the water surface by a ship for measurement, but due to the flowing of water flow, the operation of an engine on the ship can generate shaking and vibration, the measurement precision is seriously influenced, and even the measurement cannot be carried out. In the above technical scheme, can adopt the ship to transport fixed bolster to the position that needs, then fix fixed ring cover 1 on the pile lateral wall, put into hoisting frame 3 with the measuring instrument, survey crew gets into in hoisting frame 3, start hoist engine 22, rope 26 withdraws in hoist engine 22 through fixed pulley 24, hoisting frame 3 rises, after rising to backup pad 2 top, lock retaining member 33 to dead lever 23 on, thereby can avoid hoisting frame 3 to rock, the coordinate of the terminal surface of measurement bent cap that like this can be accurate. The locking member 33 may be clamped with a clamp or tightened with a string.
In another technical solution, the fixing bracket further includes a pair of inflators 14, and the pair of inflators 14 are respectively fixed on the outer sidewalls of the two half-rings 11. When the air volume of the air bag 12 is insufficient, the air bag 12 can be inflated at any time.
In another technical solution, the fixing bracket further includes a fixing reinforcing mechanism, the fixing reinforcing mechanism includes a plurality of electric cylinders 15 disposed on the sidewall of the half-collar 11 at intervals, a butt rod 16 having one end fixed to the moving end of the electric cylinder 15, and a non-slip pad 17 fixed to the other end of the butt rod 16, wherein the butt rod 16 has an axial arrangement in which one end of the non-slip pad 17 is inclined toward the half-collar 11, and when the moving end of the electric cylinder 15 extends outward to the front of the rated distance thereof, the non-slip pad 17 abuts against the outer sidewall of the pile.
In the above technical solution, in order to ensure safety, the anti-slip mat of the abutting rod 16 is driven by the plurality of electric cylinders 15 to abut against the pile so as to enhance the stability of the fixing ring sleeve 1 fixed on the pile, when the hanging frame 3 is fixed on the supporting plate 2, the fixing ring sleeve 1 is pressed downwards, and the inclined arrangement of the abutting rod 16 can transmit the force, so that the abutting force is increased, and the fixing is more reliable.
The utility model provides a measuring device for assisting original bridge plane position in enlargement bridge, including exempting from prism total powerstation and fixed bolster, the fixed bolster includes:
the fixed ring sleeve 1 is formed by hinging two half ring sleeves 11, the other sides of the two half ring sleeves 11 are detachably connected, an air bag 12 and an anti-skid layer 13 are sequentially laid on the inner surface of each half ring sleeve 11, the air bag 12 is inflated, and the anti-skid layer 13 is abutted against the side wall of one pile of the original bridge;
one end of the supporting plate 2 is fixed on the hinged end of the semi-ring sleeve 11, the other end of the supporting plate is suspended, a through hole 21 and a winch 22 are arranged on the supporting plate 2, and fixing rods 23 are arranged on the supporting plate 2 and positioned around the through hole 21;
a fixed pulley 24 disposed above the through hole 21 through a bracket 25, a rope 26 wound on the fixed pulley 24, one end of the rope 26 being fixed to the hoist 22, and the other end thereof being provided with a hook 27;
hanging frame 3 is equipped with lifting rope 31 on it, be equipped with link 32 on the lifting rope 31, link 32 articulate in on the couple 27, hanging frame 3's size is less than the size of perforating hole 21, be equipped with a plurality of retaining members 33 on hanging frame 3, wherein, work as hoist engine 22 passes through rope 26 will hanging frame 3 promotes to when backup pad 2 top, retaining member 33 lock in on dead lever 23.
In the technical scheme, the whole fixed support is light in weight, the air bag 12 can adapt to piles of different sizes within a certain range, the adaptability is wide, in addition, the supporting plate 2 and the fixed ring sleeves 1 can adopt connecting pieces and are connected through bolts, the supporting plate 2 and the fixed ring sleeves 1 of different sizes can be fixedly connected, namely, only one supporting plate 2 is needed and is matched with the fixed ring sleeves 1 of different sizes, so that different pile sizes are adapted, the construction equipment is simplified, and under the assistance of the fixed support, the coordinates of all cover beams can be accurately measured and obtained regardless of bridges of any length.
The application of the measuring method in bridge expansion is provided.
By the measuring method, the plane positions of the pile columns and the capping beams of the original bridge can be measured, the actual coordinates of the expanded bridge can be calculated according to the design geometric dimension of the expanded bridge, then the design coordinates of the expanded bridge are corrected according to the actual coordinates, and finally the measurement construction lofting is carried out on the expanded bridge according to the geometric dimension of the expanded bridge and the corrected coordinates, so that the overlapping and racking conflict between the expanded bridge and the original bridge after being built can be avoided, and the road surface clear width and the linearity smoothness of the built bridge can be ensured.
The specific method comprises the following steps:
as shown in fig. 3, reference numerals 4 and 5 are respectively a capping beam and a pile of an old bridge (an original bridge), and reference numerals 6 and 7 are respectively a capping beam and a pile of a new bridge (an expanded bridge portion).
1. The principle of transverse bridge control is as follows:
(1) and rechecking the transverse bridge direction by taking the cover beam as a reference, and rechecking according to a retest result. The transverse bridge spacing of the new bridge capping beam and the old bridge capping beam is E, and the negative value of E indicates that the new bridge capping beam and the old bridge capping beam are overlapped.
1) And when E is more than or equal to-4 cm and less than 1cm, the coordinates of the pile are not adjusted, the construction unit automatically adjusts the position of the capping beam according to the measurement result, and the control is carried out according to the E which is 1 cm. And (3) positioning according to the adjusted bent cap during the construction of the upper structure of the spliced wide bridge, and checking the beam length and the beam distribution diagram of the upper structure.
2) When E is more than or equal to 1cm and less than or equal to 5cm, the pile coordinates and the capping beam maintain the original design.
3) When E is less than-4 cm or E is more than 5cm, the pile coordinate is designed and adjusted, and the control is carried out according to the E being 1 cm.
2. Principle of forward and backward control
(1) The distance deviation C value of the capping beams of the new bridge and the old bridge along the bridge direction is within +/-3 cm, and pile coordinates and a beam distribution diagram need to be adjusted when the requirements are not met;
(2) the deviation between the newly spliced side bridge expansion joint and the existing bridge expansion joint is within +/-3 cm, and when the deviation does not meet the requirement, the pile coordinates and the beam distribution diagram need to be adjusted;
(3) the back wall lines of the old abutment of the new bridge are strictly aligned;
and (4) sorting the retest data according to the checking principle, and calculating related data by drawing a CAD graph so as to serve as a basis for coordinate adjustment.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.
Claims (8)
1. The method for measuring the plane position of the original bridge in the expanded bridge is characterized by comprising the following steps of:
measuring the abscissa and the ordinate of each vertex of two end faces of each bent cap of the original bridge under the same origin coordinate system, and calculating to obtain the plane position of each bent cap;
and measuring the abscissa and the ordinate of any three points of each pile of the original bridge on the same horizontal plane, and calculating to obtain the plane position of each pile.
2. The method of claim 1, wherein the abscissa and ordinate of each vertex of each end face of each cap beam of the existing bridge and the abscissa and ordinate of any three points of each pile on the same horizontal plane are measured with reference to the control point.
3. The method of claim 1, wherein the prism-free total station is used to measure the abscissa and ordinate of each vertex of the two end faces of each cap beam of the existing bridge and the abscissa and ordinate of any three points of each pile on the same horizontal plane.
4. The method of claim 3, further comprising supporting the prism-free total station above the water below the existing bridge with a fixed support when the point to be measured cannot be observed on land by the prism-free total station, wherein the fixed support comprises:
the fixed ring sleeve is formed by hinging two half ring sleeves, the other sides of the two half ring sleeves are detachably connected, the inner surfaces of the half ring sleeves are sequentially laid with an air bag and an anti-skid layer, the air bag is inflated, and the anti-skid layer is abutted against the side wall of one pile column of the original bridge;
one end of the supporting plate is fixed on the hinged end of the semi-ring sleeve, the other end of the supporting plate is suspended in the air, a through hole and a winch are arranged on the supporting plate, and fixing rods are arranged on the supporting plate and positioned around the through hole;
the fixed pulley is arranged above the through hole through a support, a rope is wound on the fixed pulley, one end of the rope is fixed on the winch, and a hook is arranged at the other end of the rope;
the hoist crane comprises a hoisting frame, wherein a hoisting rope is arranged on the hoisting frame, a hanging ring is arranged on the hoisting rope, the hanging ring is hung on the hook, the size of the hoisting frame is smaller than that of the through hole, a plurality of locking pieces are arranged on the hoisting frame, and when the hoist crane passes through the rope, the hoisting frame is lifted to the position above the supporting plate, the locking pieces are locked on the fixing rods.
5. The method for measuring the plane position of an original bridge in an expanded bridge according to claim 4, wherein the fixing bracket further comprises a pair of air pumps, and the pair of air pumps are respectively fixed on the outer side walls of the two half rings.
6. The method according to claim 4, wherein the fixing bracket further comprises a fixing reinforcement mechanism, the fixing reinforcement mechanism comprises a plurality of electric cylinders spaced apart from each other on the sidewall of the half collar, an abutting rod having one end fixed to the movable end of the electric cylinder, and a non-slip pad fixed to the other end of the abutting rod, wherein the abutting rod has an axial arrangement in which one end of the non-slip pad is inclined toward the half collar, and the non-slip pad abuts against the outer sidewall of the pile when the movable end of the electric cylinder is extended outward to a distance equal to the rated distance.
7. A measuring device for assisting original bridge plane position in enlargement bridge, its characterized in that, including exempting from prism total powerstation and fixed bolster, the fixed bolster includes:
the fixed ring sleeve is formed by hinging two half ring sleeves, the other sides of the two half ring sleeves are detachably connected, the inner surfaces of the half ring sleeves are sequentially laid with an air bag and an anti-skid layer, the air bag is inflated, and the anti-skid layer is abutted against the side wall of one pile column of the original bridge;
one end of the supporting plate is fixed on the hinged end of the semi-ring sleeve, the other end of the supporting plate is suspended in the air, a through hole and a winch are arranged on the supporting plate, and fixing rods are arranged on the supporting plate and positioned around the through hole;
the fixed pulley is arranged above the through hole through a support, a rope is wound on the fixed pulley, one end of the rope is fixed on the winch, and a hook is arranged at the other end of the rope;
the hoist crane comprises a hoisting frame, wherein a hoisting rope is arranged on the hoisting frame, a hanging ring is arranged on the hoisting rope, the hanging ring is hung on the hook, the size of the hoisting frame is smaller than that of the through hole, a plurality of locking pieces are arranged on the hoisting frame, and when the hoist crane passes through the rope, the hoisting frame is lifted to the position above the supporting plate, the locking pieces are locked on the fixing rods.
8. Use of a measuring method according to any of claims 1-6 for extending a bridge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202111391079.1A CN114199125A (en) | 2021-11-25 | 2021-11-25 | Method for measuring plane position of original bridge in expanded bridge |
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| CN202111391079.1A CN114199125A (en) | 2021-11-25 | 2021-11-25 | Method for measuring plane position of original bridge in expanded bridge |
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|---|---|---|---|---|
| CN116839541A (en) * | 2023-08-29 | 2023-10-03 | 西南交通建设集团股份有限公司 | Settlement degree measuring device for bridge construction |
| CN116839541B (en) * | 2023-08-29 | 2023-11-10 | 西南交通建设集团股份有限公司 | Settlement degree measuring device for bridge construction |
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