The quality of the project for the main structure won the "Great Wall Cup Award", while the main project concrete to meet the specific requirements of Beijing's water-based concrete is the foundation, we have to ensure the quality of clear water to take the following series of construction and technical measures. A measurement of measuring and measuring line As the pilot process should be run through all aspects, it is to ensure that the main structure dimensions to meet the design requirements of the premise is to make the main structure to reach the foundation of clear water concrete, the actual construction should seize the following points: 1.1 Construction vertical accuracy (1) The level of point laying buried level is the basis of vertical control, requiring a construction site area set not less than 3, the distance between points 50 ~ 100m, in order to facilitate mutual communication and check , The standard point on the wall should be set in a stable building, in order to save, find, cited test. (2) The layout of the elevation control network The presence area establishes the elevation control network based on the standard points provided by the owners (cited by Beijing Bureau of Surveying and Mapping). 1.2 plane axis projection plane axis accuracy control, is to ensure that the design of the axis and detailed line accurate basis. According to the axis control pile, the required axis is projected to the construction plan. The longitudinal and transverse axes measured on the same layer shall not be less than 2 as the check of the angle and distance. After checking the correct release of the corresponding design axis and thin line in the plane. In the actual construction should pay attention to: ①the floor of the axis of projection, the vertical deviation of the upper and lower layers shall not exceed 3mm; ② axis cast after the release of the vertical geometry and templates in place line, check the control line; ③ construction plane measurement is completed After the demolition of the wall, the structure measured on the wall 1m line for the next procedure to use; ⑤ each layer of plane or each axis after the test, the self-test After passing the full-time staff re-examination, after passing the inspection. 1.3 Quasi-elevation test To ensure the accuracy of vertical control requirements, we must first conduct a joint test of elevation control points to check whether the quasi-point level field has been touched and confirmed that the quotation elevation is correct. (1) The survey of elevation reference points must be correct. The same layer shall be not less than 3 in order to check each other. The 3-point correction shall not exceed 3mm. Take the average value as the reference point of elevation in plane construction. (2) According to the conditions of the foundation pit, set up a marker pile in the pit and mark the elevation on the marker pile, marked with red "△" and mark the absolute elevation and the relative elevation for construction purposes. (3) on the ground floor and elevator pit, the use of 10cm × 10cm steel plate, with a needle scored "ten" word line as a reference point for the elevation of the test provides the basis for the first floor above all levels at the reference point At the corresponding position above is designed to reserve hole 200mm × 200mm (laser beam and hammer ball through-hole), is strictly prohibited, and prevent debris from falling from the hole. (4) All levels of elevation are transmitted using the first floor red "△" on the top line for the elevation of the baseline, with a qualified steel ruler up cited cited can also be located in the middle layer, plus elevation reference point, in order to pass up . (5) Elevation reference point Each floor of not less than 3, with the level of return test, test set mark qualified, and to be located in the same level elevation. The above is to ensure the quality of fresh water concrete construction technology and measures.
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