Quzhou settlement observation point, stainless steel observation standard, galvanized observation standard, full range of specifications, multiple styles

Description :

　　Product Name

　　Settlement observation point

　　material

　　stainless steel

　　Specifications

　　12*100mm,12*150mm,12*200mm,14*150mm,14*200mm,14*250mm,14*300mm,16*150mm,16*200mm,16*250mm,16*300mm,16*350mm,16*400mm,18*150mm,18*200mm,18*250mm,18*300mm,20*150mm,20*200mm,20*250mm,20*300mm,12*120mm, Inner hole 12 stainless steel round cover, inner hole 14 stainless steel round cover, inner hole 16 stainless steel round cover, inner hole 18 stainless steel round cover, inner hole 20 stainless steel round cover

　　Settlement observation points are widely used in engineering construction such as bridges and tunnels, highways, housing construction, wind power and other geological fields that are prone to settlement. After its installation, a series of protective measures were taken to prevent damage to the settlement observation point. A "settlement observation point protection cover" or "settlement observation point protection box" was put on the surface of the settlement observation point. Our technicians used 304 stainless steel material as the main production material to prevent rusting of the outer protection cover in the initial design. However, its cost and cost were relatively high. After several years of development, stainless steel settlement protection covers have gradually been replaced by other materials such as "galvanized materials" and "cast iron materials". Although they are cheap, they do not meet engineering requirements and are not suitable for long-term measurement. They are prone to rusting and affect the measurement accuracy of the observation point. Surveying and mapping units often have to rework during acceptance due to quality problems such as the aesthetics of the measurement point and the protection cover.

　　1、 Temporary control point layout and measurement.

　　1. Temporary control point layout, as we all know, is a place with good visibility, stable geology, and is not easily damaged.

　　2. Temporary control point measurement, correct measurement method, after completion, ask Party A to retest and issue relevant documents, and then compare their own and Party A's data.

　　2、 Measure the opening of the hole.

　　1. Preparation before measurement:

　　1.1: Necessary instruments: total station, level, programming calculator. The total station and level must be calibrated in advance. It is required to calibrate every six months, but in reality, they should be calibrated every six months to a year.

　　1.2: Necessary documents: Detailed curve element table of the section, coordinate disclosure of the conductor, pile by pile coordinate table (some not available), complete set of drawings, all of which must be signed by relevant personnel.

　　1.3: Develop a measurement program based on the document 1.2 above. It mainly includes coordinate forward and backward calculation, vertical curve, and over excavation. Other mini programs can add subroutines to these three programs as needed. After programming, it is necessary to input known data into the program to verify whether the program can run and whether the calculations are correct. Each curve verification point should have at least three points, including the starting point, midpoint, and endpoint. The over excavation program verifies that each segment of the arc has at least three points, which are also the starting point, midpoint, and endpoint of the arc. Important things must be verified three times: must be verified, must be verified, must be verified.

　　1.4: Spreadsheet statistics of the surrounding rock categories corresponding to the mileage of each section in the tunnel; The mileage and drawing numbers corresponding to all caverns, embedded parts, track crossing pipes, widened sections, and transition sections are provided to avoid forgetting during the construction process and facilitate searching and viewing.

　　2. Hole measurement.

　　3、 Excavation measurement.

　　1. Develop a program for over excavation and under excavation

　　2. Temporary control point layout.

　　2.1: The control points inside the tunnel are arranged on the inverted arch surface, usually in groups of 100-200 meters, with one point on each side of the tunnel centerline.

　　2.2: Temporary control points for tunnel excavation measurement are generally arranged on the initial support. It can also be directly arranged on the inverted arch with a step distance of less than 40 meters.

　　2.2.1 The excavation control points are arranged at a height of about 1.5 meters above the excavation floor for easy visibility.

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