A Method for Positioning and Measuring Structures in Cofferdams
A technology for positioning measurement and structures, applied in the direction of measuring distance, measuring instruments, measuring devices, etc., can solve the problem that the coordinates of structures in the cofferdam cannot be measured accurately, and achieve the effect of improving accuracy
Active Publication Date: 2021-06-15
中铁大桥局第七工程有限公司
View PDF5 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0003] Aiming at the problem that the coordinates of the structure in the cofferdam cannot be accurately measured in the prior art, the present invention provides a method for positioning and measuring the structure in the cofferdam
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0042] Such as figure 1 As shown, taking the double-wall steel cofferdam as an example, there are four control points with known plane coordinates on the banks around the cofferdam, which are control point a, control point b, control point c and control point d.
[0043] According to the construction design, the inner plane size of the cofferdam is 45m×23m, the radius of the round chamfer is 3.25m, the elevation of the cofferdam crest is +16.8m, and the elevation of the cofferdam bottom is -2m.
[0044] Four observation platforms are arranged near the four corners of the inner wall of the cofferdam, which are respectively marked as observation platform 1, observation platform 2, observation platform 3 and observation platform 4. Connecting forced centering discs are respectively set on the four observation platforms to force the centering circle The center of the disc is an encryption point, which is marked as encryption point 1, encryption point 2, encryption point 3, and enc...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a method for positioning and measuring structures in a cofferdam, and relates to the field of bridge construction. First set up several observation platforms in the cofferdam, fix a forced centering disk on each observation platform, and use the center of the forced centering disk as the encryption point to form a cofferdam control network, in which at least two encryption points have an elevation of At the top of the cofferdam, the rest of the encryption points are located at different elevations in the cofferdam; the height difference between two adjacent encryption points is controlled to ensure that the vertical angle of observation between adjacent encryption points is within ±20 degrees; for the vertical projection of the encryption points, Obtain at least two projection points at the bottom of the cofferdam; measure and calculate the plane coordinates of each encrypted point according to the control points of the known plane coordinates set around the cofferdam, and calculate the plane coordinates of each projection point; set up a total station on the observation platform According to the plane coordinates of each encryption point and projection point, the plane coordinates of the structures in the cofferdam are measured and calculated, and the invention solves the problem that the structures in the cofferdam cannot be accurately measured.
Description
technical field [0001] The invention belongs to the field of bridge construction, and in particular relates to a method for positioning and measuring structures in a cofferdam. Background technique [0002] In the construction of deep-water cofferdams, it is usually necessary to perform positioning measurements on the structures and piers in the cofferdams. Since the control points are located on both sides of the cofferdam and the target measuring points are located in the cofferdam, an observation platform is generally set up on the top of the cofferdam, and a total station is set up on the observation platform to measure the angle and distance of the target measuring points in the cofferdam. Since the range of the vertical angle directly observed by the total station is roughly -42 degrees to 35 degrees, if the vertical angle is too large, it will affect the accuracy of the measured horizontal distance and horizontal angle, and affect the accuracy of positioning and measu...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): G01C15/00G01C3/10
CPCG01C3/10G01C15/00
Inventor 王光富杜操蒋思君李施展韩国卿张彦武徐钰鑫梅晓炎陈杰江银朋张泽鸿吴桐
Owner 中铁大桥局第七工程有限公司