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Heating and Cooling
Published in Stan Harbuck, Donna Harbuck, Residential Energy Auditing and Improvement, 2021
If the blower fan is dirty, then the indoor evaporator coil is also probably dirty. If possible, inspect the evaporator coil visually to evaluate it for dirt. If there is no access hatch to do this, you may have to create one. Use a mirror to view the entire underside areas of the evaporator coil. If the coil is dirty, clean it very carefully using water and indoor coil cleaner and a brush. Remember the aluminum fins on a coil are very delicate and can easily be damaged to the point where they do not allow as much air through the coil. If you find some damaged fins or damage some fins yourself, use a special fin comb to straighten bent fins and thus prevent them from reducing airflow. Clean the drain pan and the drain line that sit at the bottom of the evaporator coil. Attempt to clean clogged weep holes with a properly sized wire, and pour a tablespoon of bleach into the weep holes to help prevent fungus growth.
Earth retention and earth anchors
Published in Alan J. Lutenegger, Soils and Geotechnology in Construction, 2019
A gravity wall is typically thought of as a large mass of cast-in-place concrete used to retain soil and resist lateral earth pressures. Gravity walls may be cast as monolithic structures, or they may be placed on a footing. Occasionally, they will have a projecting section outside of the base width, as shown in Figure 7.2. The stability with respect to sliding and overturning is provided primarily by the mass of the wall. The front face of the wall is usually battered, and the back face may be vertical or may be battered. Weep holes are often placed along the base of the wall to allow water to drain from the back of the wall, relieving any pressure that might build up over time. The wall may be embedded to provide some passive resistance from the soil in front of the wall.
Lining
Published in S. Ponnuswamy, D. Johnson Victor, Transportation Tunnels, 2017
S. Ponnuswamy, D. Johnson Victor
Wherever possible, suitable weep holes should be left for seepage water to flow into drains, instead of blocking it completely and inducing hydrostatic pressure unless the lining is designed to withstand the same, as in subaqueous tunnels.
Monitoring the dynamic response of track formation with retaining wall to heavy-haul train passage
Published in International Journal of Rail Transportation, 2022
Guishuai Feng, Liang Zhang, Qiang Luo, Tengfei Wang, Hongwei Xie
The sensor installation process on the retaining wall was carried out in parallel with its construction work. First, the foundation trench of the wall was excavated, the trench was backfilled to a depth of 0.5 m with lime soil, and the soil was compacted to the target compaction degree. Then, prefabricated concrete blocks integrated with specific sensors (Figure 6) for the wall response measurement, installed formwork for the retaining wall, located and fixed the prefabricated blocks and weep holes, led the electrical wires out with complete protection, followed by pouring concrete. Last, we removed the formwork, allowed sufficient time for concrete curing, backfilled 0.3-m-thick medium-coarse to coarse sand as filter media on the wall back, backfilled and compacted in situ soils at the wall toe, and installed vibration sensors with waterproof protection on the wall top after the completion of wall construction.