On site water and construction of reinforced concrete structures, concrete transportation and supply about a third of its total hours of one-third. In heavy traffic areas and narrow sites for high-rise or high-rise building construction, used truck-mounted concrete pump or pump to transport concrete to the construction site. Compared with the traditional mode of transportation, truck-mounted concrete pump or pump system may relieve the heavy manual labor, and continuous operation, so as to shorten the duration and reduce project cost, improve project quality. Truck-mounted concrete pump or pump when pumping, in addition to good performance of the device itself, but also has strict requirements for quality, otherwise it will cause blocking, affecting the progress of construction. Are encountered in the construction of plugging problems and solutions are presented below.

1. raw material quality problems caused by blocked tubes

At a construction site, construction of two pump construction, had hardly begun pumping, plugging occurs. When out of concrete block, and found that concrete is dry. After inspection, the ratio of normal, but as a result of the disposal of waste is a factory of porous aggregate, which is not suitable for mixing concrete aggregate. In its high pressure pumping, pore water, pulp is crushed the bone material, leading to low moisture content of the concrete, poor mobility, resulting in a block. Emergency treatment is to aggregate around this hole up and soaked with tap water for a few days so that suction feet of water, and increase the proportion of cement, then high-voltage small-displacement pump, does not recur after blocking.

2. blocking caused by improper piping tubes

At a bridge construction site, construction of two pump manufactured by the same company, a pump down on a hillside; another under the mountain level of pumping. The result, horizontal pumping well and pump down is always blocking. Results are caused by improper piping pipe blockage. Downward pump concrete can cause segregation, which pipe is straight down, special measures have been taken. Concrete in down pump sent Shi, it of flow situation is conveying pump cannot control of, concrete for weight and produced down artesian of phenomenon, to produced serious segregation, caused rough aggregate flow fast, in vertical tube and level tube handover at, rough aggregate for product material and stop forward, and behind of fine aggregate, and mortar flow slow, makes conveying tube in the into some air, these air will with concrete of constantly pump sent and gradually was compression back drag pump out material mouth near, formed air lock, dang its pressure and pump sent pressure similar Shi, Concrete cannot be pumped, resulting in blocking. In accordance with the technical requirements after re-cloth tube, pipe block disappears.

3. improper concrete mix block

At a highway construction site, the construction unit with dozens of concrete pump built from the same manufacturer, using concrete. Because of long lines, big demand for concrete, concrete suppliers, resulting in a part of the pump pumping serious blocking. After the company's engineers to understand the real situation, determine concrete quality problems. Found when checking for concrete mix, concrete medium-coarse sand in the sand too much and rarely. Coarse sand and water absorption, water retention and poor liquidity, resulting in uneven distribution of aggregate in cement in producing stratification and segregation, making pumping resistance increases. After switching to other suppliers of concrete and pumping returns to normal.