Zhong Da Consulting has compiled the knowledge in the architectural knowledge column of this website, and the basic information of the tunnel investigation scheme is as follows:
Tunnel engineering survey runs through all stages of tunnel engineering planning, survey design, construction and operation management.
In order to help relevant personnel understand the basic situation of tunnel survey scheme, according to the relevant contents of different tunnel projects, the construction control survey results are defined in the tunnel survey scheme. The basic situation is as follows:
Control point inspection and detection
During the construction process, the control network should be tested regularly or irregularly. When there is a problem with the stability of control points, local or comprehensive retest should be carried out immediately.
When only a few control points in the control network are displaced or settled, and other control points around are still reliable, local retest can be carried out to connect the displaced control points with the surrounding stable points into an insertion point network. After precise measurement and variance calculation, the unstable point is given a new value.
When a few control points in the control network have obvious displacement, and the stability of other control points is difficult to judge, a comprehensive retest should be carried out and the relevant regulations should be met.
After comprehensive retest, the adjusted value after retest should be adopted.
Plane control points are based on GPS points, and the angles and distances of each point are measured according to the attached traverse, and the coordinates of each point are calculated after adjustment.
The ground elevation control points shall be continuously measured with second-class leveling points respectively.
The results must be reported to the survey supervision engineer and the survey supervision center for approval before use.
Key points of construction inspection
Testing shall be carried out in accordance with the requirements of the same level of precision work, and the results shall be reported. Generally speaking, the tests are different.
If the error should be less than 2 times, the original measurement results can be used. If it is greater than this value or gross error is found, it should be handled by the supervision department in conjunction with the monitoring center.
On-site construction encryption control points can only be used as the basis of construction lofting after they are inspected by the monitoring center. In the subsequent construction, if the encryption control points are destroyed or the existing control points can no longer meet the existing construction survey conditions, new encryption control points need to be added, and they need to be inspected according to procedures, and can only be used after passing the inspection by the monitoring center.
First lofting test of important parts, such as station maintenance pile construction, guide wall axis lofting, etc. , must be reported to the monitoring center for testing, and the subsequent process construction lofting shall be tested by the resident survey supervision engineer and reported to the monitoring center for review.
When the station is excavated to the floor, the floor construction control points should be buried in time, and the control points should be buried in the center line of the line. Burying standards should refer to subway survey specifications. After the point is stable, self-inspection shall be carried out in time and reported to the station supervision center for re-inspection. Only after re-inspection is qualified can it be used for the next construction.
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