Layout of settlement observation points for Ya'an L-type straight observation standard

Description :

　　Layout of settlement observation points for Ya'an L-type straight observation standard

　　In the observation process of buildings, it is necessary to set benchmark points, because the main method of settlement observation is to use leveling measurement to measure the height difference between benchmark points and observation points multiple times to determine the degree of settlement of the building. Therefore, the setting of settlement points is very important, and special attention should be paid to the following requirements when setting settlement points:

　　(1) At least three benchmark points should be established in each observation area to compare positive effects. Ensure the accuracy of the obtained results.

　　(2) The benchmark set should not be affected by settlement, and attention should also be paid to avoiding areas where the marker stones are easily damaged. The burial depth should not be higher than 0.5m above the freezing line.

　　(3) To control the distance between the observation point and the benchmark, it should not be less than 20m or more than 100m. The pre embedded part signs for settlement observation points can be in the form of wall observation points, observation points on reinforced concrete columns, and observation points on foundations.

Layout of settlement observation points

　　The observation of settlement must comprehensively reflect the settlement characteristics of the foundation, so when setting settlement points, suitable observation point locations must be selected based on geological conditions and building structural characteristics. You can refer to the following locations for details:

　　(1) When setting up on the four corners of the building, every 10-15 meters on the exterior walls, and on the column foundation, attention should be paid to spacing 2-3.

　　(2) The junction between high-rise and low rise buildings, the junction between new and old buildings, and the junction between vertical and horizontal walls should be set on both sides of the junction.

　　(3) On both sides of the boundary between different structural structures, such as building cracks, settlement joints, and the boundary between artificially created foundations and natural foundations.

Selection of settlement observation markers

　　In the actual construction process, different signs such as wall or column signs, concealed signs, and foundation signs should be adopted according to different building materials and structures. Although the signs are different, the upright part of the sign should have a prominent protrusion or a semi-circular shape, and attention should be paid to anti-corrosion treatment. When pre embedding, it is important to maintain a certain distance between the ruler and the wall or floor, while also avoiding obstacles that obstruct observation, such as window sills.

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