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The content of deformation monitoring shall be determined according to the nature of the deformed body and the condition of the foundation. Deformation monitoring mainly involves the acquisition of deformation information, the analysis, interpretation and deformation prediction of deformation information. The main deformation monitoring methods include ground conventional measurement technology, ground photogrammetry technology, special and dedicated measurement methods, etc. Among them, the fully automatic tracking total station provides a good technical means for the automatic detection of local engineering deformation, and can carry out unattended, all-weather, all-round automatic detection within a certain range.

NG28 provides settlement monitoring services related to engineering site monitoring and measurement. It uses optical leveling instruments to measure the elevation of the monitored object and calculate the elevation change, so as to grasp the displacement and displacement speed of the monitored object in the vertical direction over time.

NG28 provides tunnel monitoring services related to engineering site monitoring and measurement. "The monitoring and measurement plan should be comprehensively selected based on the surrounding rock conditions, surrounding environment, tunnel depth, section size, excavation method and design requirements. Monitoring and measurement are divided into necessary There are two types of test items and selective test items. The required test items are the daily monitoring and measurement items that should be carried out in the tunnel engineering; the selected test items are the monitoring and measurement items to meet the special requirements of design and construction. The geological sketch is carried out in time after the tunnel excavation And digital imaging, and physical mechanics tests if necessary."

NG28 provides bridge deformation monitoring services related to engineering site monitoring and measurement. Bridge deformation can be divided into static deformation and dynamic deformation. Bridge piers and abutments are generally static deformation; bridge deflection deformation is dynamic deformation, which is an important parameter for the evaluation of bridge health. It is necessary to accurately measure bridge deflection values ??in bridge inspection, rebuilding of dangerous bridges, and acceptance of new bridges.

NG28 provides on-site monitoring and measurement related building tilt monitoring services, "laying monitoring reference points on the outside of the building and on the extension line of the building facade. For example, for rectangular building layouts, 4 stable reference points should be laid. , The observation point adopts the reflective sheet matched with the total station and is arranged on the facade of the building. An inclinometer can also be used to measure the inclination angle of the building. The inclinometer is divided into two types: fixed type and movable type. Fixed type The probe is fixed and buried at a fixed point inside the structure; the movable type is to bury an inclinometer tube with a guide groove first, and the probe is placed in the tube and slides along the guide groove at a certain interval to measure the slope change and calculate the horizontal displacement. "

NG28 provides monitoring benchmark network services related to engineering site monitoring and measurement. "The establishment of a benchmark network can ensure the unity of monitoring work, improve the accuracy of monitoring data, and enable the monitoring work to effectively guide the entire process of construction. China Surveying and Mapping as an independent monitoring Fang, its monitoring data and related analysis data can become an important reference for handling risks and engineering safety incidents."

NG28 provides foundation pit, supporting structure and building (structure) monitoring services related to engineering site monitoring and measurement. Huace's foundation pit monitoring items include: 1. Horizontal displacement; 2. Vertical displacement; 3. Enclosure wall Deep horizontal displacement; 4. Deep horizontal displacement of soil; 5. Internal force of wall (pile); 6. Internal force of support; 7. Vertical displacement of column; 8. Tension of anchor rod and soil nail; 9. Uplift of pit bottom; 10. Earth pressure; 11. Pore water pressure; 12. Groundwater level; 13. Vertical displacement of the soil layer; 14. Vertical displacement of the surface behind the wall; 15. Cracks; 16 Inclination; 17 Deformation of the surrounding underground pipelines.

NG28 provides engineering site monitoring and measurement related rail transit foundation pile control network services. It uses the plane elevation of the three-dimensional control network to measure and set the same point. Each control point has a small error and high accuracy with its adjacent control points. For the layout of the measuring points, the control points shall be set up in the roadbed part, the tunnel part and other places that are not easily damaged by using permanent embedded parts.

NG28 provides on-site monitoring and measurement related rail transit structure deformation measurement services. Rail transit deformation includes two forms: track structure deformation and tunnel structure deformation. The main reason for the deformation of the track structure is the long-term repeated effects of the train load on the track, causing geometric deviation of the track, which in turn affects the smoothness and smoothness of the track; in addition to the effect of the train load, the unloading, loading, and loading of the construction around the tunnel are also It will cause uneven settlement of the track bed, which will also affect the flatness and smoothness of the track.

NG28 provides track geometric state inspection services related to engineering site monitoring and measurement. Regarding track geometric state inspection of railways, subways and urban rail transit, the monitoring equipment mainly includes add-on instruments, vehicle-mounted line inspections and track inspection vehicles. In addition to monitoring the track geometry status, it can also make a comprehensive evaluation of the track status in terms of wheel-rail interaction and driving stability.

NG28 provides project site monitoring and measurement related tall formwork support system (engineering monitoring) services. "High formwork projects are divided into the following: the support system height exceeds 8m or the span exceeds 18m, the total construction load is greater than 15kN/m2, or concentrated load Formwork support system greater than 20kN/m. There is a special plan for the construction of tall formwork. The construction plan is compiled in accordance with relevant national standards and specifications, combined with actual projects, and can be implemented after expert evaluation."