A measurement mark and its positioning method for control points of prefabricated structures
A technology for measuring marks and prefabricated structures, applied in the direction of measuring point marks, etc., can solve the problems of difficulty in determining the precise position, wear, easy deviation, etc., and achieve the effect of easy protection of depth and position, improvement of embedded accuracy, and guarantee of stability.
Active Publication Date: 2018-03-27
中铁十一局集团桥梁有限公司
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Problems solved by technology
The disadvantages are: first, the positioning of the pre-embedded iron rod is difficult, and it is often easy to misalign during the concrete pouring process; The surface of the rod is not easy to protect during the concrete pouring process and after the measurement is completed
Method used
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[0013] control figure 1 It can be seen that a measurement mark for a control point of a prefabricated structure comprises a pre-embedded steel plate 1, an anchoring steel bar 2, a positioning steel plate 4 and an anchoring steel plate 5, the side length of the pre-embedded steel plate is 40mm*60mm, and the thickness is 5mm. Bolt holes corresponding to the bolts are provided on the pre-embedded steel plate, and a measuring tapered hole is provided at the center of the pre-embedded steel plate. The anchor steel bar is welded to the pre-embedded steel plate. Twice as much as the embedded steel plate, four bolt holes corresponding to the embedded steel plate are opened on the positioning steel plate, and conical raised blocks are set at the corresponding positions, the positioning steel plate and the embedded steel plate are connected by anchor bolts 3, One side of the anchoring steel plate is provided with a bolt hole corresponding to the embedded steel plate and a tapered raised...
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Abstract
The invention provides a survey mark used for control point of prefabricated structure and positioning method employing survey mark, and the survey mark comprises a pre-buried steel plate, an anchoring steel bar, a positioning steel plate and a fixed bolt. a pre-buried steel plate and an anchoring steel bar are connected by welding, a positioning steel plate traverses a reserved bolt hole on the pre-buried steel plate by a fixed bolt for positioning, the pre-buried steel plate is provided with a groove shaped measurement point control hole and the positioning steel plate is provided with a corresponding taper projection, during installation, the taper projection and the groove are clamped for spacing, thereby guarantying stability of the pre-buried steel plate, during measurement, the fixed bolt and the positioning steel plate are dismounted, and a prism is directly placed into a groove location hole. According to the invention, the anchoring steel bar and the positioning steel plate are used for firmly positioning the pre-buried steel plate, simultaneously, the groove shaped measurement control hole reserved on the pre-buried steel plate can be prefabricated, and the depth and the position are easily to be guaranteed; during measurement, the control point is easy to be determined, after measurement, the positioning steel plate can be continuously used for protecting the measurement point; compared with the prior art, the stability of the survey mark is guaranteed, and the pre-embedded precision is improved.
Description
technical field [0001] The invention relates to the technical field of prefabricated concrete engineering measurement, in particular to a measurement mark for a control point of a prefabricated structure and a positioning method thereof. Background technique [0002] In engineering measurement, especially the linearity and elevation control of precast concrete structures, it is often necessary to bury measurement control marks. The stability and accuracy of measurement marks directly affect the structural dimension and linearity. At present, the common method of measuring marks of control points is to bury an iron rod at the corresponding position and engrave a crosshair on the top surface of the iron rod. The disadvantages are: first, the positioning of the pre-embedded iron rod is difficult, and it is often easy to misalign during the concrete pouring process; The surface of the rod is not easy to protect during the concrete pouring process and after the measurement is co...
Claims
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IPC IPC(8): G01C15/02
CPCG01C15/02
Inventor 周玲敏曾鸣谭坤葛斌斌宋加加方辉刘继仁宓浩叶孔晟黄广洪
Owner 中铁十一局集团桥梁有限公司