In water conservancy projects, the installation of gravity dam corridor weir gauges is a key link to ensure effective monitoring and management of water resources. This paper will elaborate on the installation method of the weir and the weir plate to ensure the installation quality and improve the efficiency of water resource utilization.
First, the installation position of the weir meter.
The weir gauge should be installed upstream of the weir plate, not less than 100cm away from the weir plate. This layout is conducive to accurate measurement of water flow data, reducing the influence of water flow on the weir gauge and ensuring the reliability of measurement results.
Second, the construction of the groove in the side wall of the weir groove.
At the side wall of the weir groove, an inner groove needs to be built. The size of the inner groove should be designed according to the actual situation to ensure that it can accommodate components such as water weir gauge and antifouling pipe. At the same time, the construction of the inner groove should ensure the stability and durability of the structure.
3. The opening of the installation hole and the installation of the anti-fouling pipe.
At the bottom of the weir groove, an installation hole needs to be opened. The diameter of the installation hole should be greater than 15 cm and 10 cm lower than the water surface. This design facilitates the installation and fixing of the anti-fouling pipe, and at the same time prevents the water flow from washing the anti-fouling pipe.
Insert the antifouling pipe in the mounting hole and adjust the verticality of the antifouling pipe by looking at the horizontal bubble on the upper end cap. After the adjustment, cement mortar is used to consolidate the surrounding area of the antifouling pipe to prevent the mortar from entering the inside of the antifouling pipe. In the process of consolidation, attention should be paid to ensure the stability and verticality of the antifouling pipe.
Fourth, clean the filling of fine gravel.
Around the antifouling pipe, it is necessary to fill in clean fine gravel. During the filling process, attention should be paid to the uniformity and compactness of the fine crushed stone to ensure that the grooves are completely filled. At the same time, the filled fine gravel should have good permeability and stability to prevent the erosion and erosion of the weir groove by the water flow.
5. Inspection and maintenance after installation.
After the installation is completed, the weir meter and the anti-fouling pipe should be inspected to ensure that they are working properly and stably. During use, the weir gauge should be calibrated and maintained regularly to ensure its measurement accuracy and service life.
Flow calculation formula:
a) Right angle triangular weir flow calculation formula: q = 14× h5/2
Where: Q - flow rate, unit is m3 s;
h—the head of the weir in m.
b) Rectangular weir flow calculation formula:
q = m×b×sqrt(2g)×h3/2
m =(0.402+0.054×(h/p))
Where: Q - flow rate, unit is m3 s;
b - weir width, unit m;
h—the head of the weir in m.
p—the distance from the weir roof to the weir crest, the unit is m.
c) Trapezoidal flow calculation formula: q=186bh3/2
Where: Q - flow rate, unit is m3 s;
b - the width of the bottom of the weir, the unit is m;
h—the head of the weir in m.
The installation of the water measuring weir of the gravity dam corridor and the water measuring weir plate is a highly technical and demanding work. Through the introduction of Nanjing Aosi, I believe that everyone has a deeper understanding of the installation method. In actual operation, the installation should be carried out in strict accordance with the technical requirements to ensure the quality of installation and provide a strong guarantee for the effective monitoring and management of water resources.