Empty drum crack:
Due to the low temperature in winter construction, the mortar is frozen. After the thawing in the spring of the next year, it is easy to cause the surface layer and the layer or the base layer to be poorly bonded and empty. In severe cases, there is chalking. Therefore, it is necessary to maintain a positive temperature when carrying the outdoor axe, which is not suitable for winter construction. 6.1.2 The backfill of a layer of ground and step base shall be layered and densified step by step, otherwise it will easily cause hollow cushion and subsidence cracks in the concrete cushion and the base layer. The thickness of the step concrete cushion should not be less than 8cm.
A steel mesh should be added at the same time under the base material. For foundations and steps of different practices, settlement joints or dividing bars shall be left in place; to prevent uneven settlement and cracks.
The surface deviation of the base layer is large, and the base layer is treated or improperly constructed. For example, each layer of plaster is too tight and there is no watering and curing. The bond strength between the layers is very poor, and the surface layer and the base layer are prone to hollow cracks.
The cleaning of the base layer is not clean and has not been seriously treated, which is often the main cause of the cracks in the surface layer and the base layer. Therefore, it must be operated strictly in accordance with the process standards, paying attention to the basic treatment and maintenance work.
The cleaning of the base layer is not clean and has not been seriously treated, which is often the main cause of the cracks in the surface layer and the base layer. Therefore, it must be operated strictly in accordance with the process standards, paying attention to the basic treatment and maintenance work.
Uneven pattern: mainly does not master the opening time, the irregular pattern, the inconsistent force during operation and the unsatisfactory axe. Technical training, counseling and sample boards should be strengthened to guide the operation and construction.
There are pits on the meteorite surface: the large area has not been tested before, and the strength of the surface layer is low.
Commonly used distance measurement methods include tape measure distance and photoelectric distance measurement. The measuring distance of a tape measure is measured along the ground using a tape-like ruler that can be rolled up, which is a direct measuring distance. Photoelectric ranging is to use an instrument to transmit and receive modulated light waves between two points, and measure the distance according to its propagation speed and time. It belongs to electronic physical ranging. Photoelectric ranging is indirect ranging.
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