1, project overview:
In this project, the bent span of the wharf is 7.0m, the fixed trestle of the floating wharf is 20m, the prestressed hollow slab is 16m long, and the foundation piles are all rock-socketed cast-in-place piles. The piers and mooring piers are cast-in-situ piers, and the foundation piles are prestressed square piles.
2. Available information:
A set of construction drawings and a fax from the owner's survey control point.
2. 1 survey of the owner's control points: after receiving the fax from the owner's survey control points, we immediately surveyed the plane control points J 1, J2 and JBOY3 after the supervisor handed over the piles.
2.2 Basis for initial control of the wharf: After consultation with the supervisor, the owner and other units, J2 is adopted as the starting point for survey control, J2 to JBOY3 as the starting point, and J2 to J 1 as the check point for the wharf project, so as to encrypt the engineering control points and set out the construction.
3, plane control point encryption:
In order to facilitate axis control and construction lofting, K 1, K2 and K3 are encrypted near the wharf by branch traverse method.
4, elevation control:
The owner's fax requires T8 as the elevation starting point. According to the site conditions, T8 is far from the wharf. After consultation with the supervisor, the owner and the designer, it is decided to take BM point H=4.628m (Yellow Sea elevation) near the wharf as the elevation starting point after review.
5, axis layout:
6, construction lofting:
The key of engineering survey setting-out is the positioning survey of bored piles. According to the specific situation of the construction site, it is decided to use a total station for positioning and another theodolite for checking. See the positioning survey of bored pile for details, and the layout shall be carried out according to the requirements of secondary traverse.
7, deformation observation:
Deformation observation is an important means to ensure the safety of engineering construction and the normal operation of facilities, and it is also an effective measure to obtain similar engineering deformation observation experience. During the construction of this project, the construction deformation was monitored. Focus on monitoring the stability of cast-in-place piles and prestressed square piles.
The embedding method and observation requirements of the basic points of deformation observation refer to the relevant provisions of the state. The settlement observation point and displacement observation point must be firmly combined with the deformed body, and the embedding position should be carried out according to the requirements of the drawings. Burying methods and observation requirements shall be implemented in accordance with relevant state regulations.
At the initial stage of the establishment of the deformation observation system, two or more continuous observations are made, and the average of the effective values of continuous observations is taken as the first reference value of observation. After the buried observation point is stable, the first observation shall be made immediately. During the construction period, an observation shall be made for each additional load, and the observation period shall be determined according to the design requirements.
All observation data have been carefully checked, sorted out in time and analyzed reasonably. Judging whether the observation results conform to the normal change law; If abnormal observation values and abnormal changes are found, carefully analyze the reasons and report to the supervisor and design in time.
8. Completion survey and data management
After the completion of the project, the survey of the completed topographic map shall be completed in time, and the survey data shall be accumulated from the start of the project. Including engineering survey control point handover data, control point review data, encrypted data, construction lofting positioning data, settlement and displacement observation data, concrete pouring and molding inspection table, supervision design requirements, etc. The survey data that need to be submitted to the supervision engineer for approval and filing shall be submitted for approval in time. Except for the special requirements of the supervision engineer, all measurement data shall be executed in accordance with the corresponding documents and data control procedures in the quality assurance system.
9, equipment configuration, personnel organization:
According to the small scale of this project, the buildings (structures) are relatively concentrated, and the relationship is relatively simple. The instrument configuration is as follows: one total station, one J2 theodolite, one S3 level and other necessary auxiliary tools.
8, construction process measurement quality control measures plan:
8. 1 Strictly implement the measurement specifications to meet the measurement accuracy requirements of this project.
8.2 All control lofting shall have original records, and the record book shall not be altered or torn at will.
8.3 lofting must have positioning records and technical review records.
8.4 The positioning records of axis, pile location and other important parts shall be submitted to the supervision engineer for approval.
8.5 Regularly review the axis points and elevation control points.
8.6 Surveying and mapping personnel should hold a surveying and mapping work permit; The meter has a verification certificate, and it is regularly self-checked and submitted for inspection.
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