Concrete pumps are known as a vehicle used to transport concrete to construction sites. However, it would not be correct to evaluate concrete pumps as just a tool. With the rapid development of technology in recent years, different models have started to be produced in these pumps according to the demands of use. In fact, it is possible to use concrete pumps in construction sites where continuous concrete pouring is required, by mounting them with concrete chamber and pipes. Considering that it is necessary to provide concrete casting with different properties for each structure, it will be understood how important these pumps are for the construction sector.
How Concrete Pumps Work
Concrete pumps usually contain two cylinders. With the help of the mixers in these cylinders, continuous mixing of the concrete in the cylinder is ensured. In this way, it is ensured that the concrete does not freeze and is transferred to the desired surface in a liquid form. The cylinders in the pump push the concrete in the mixers forward under the influence of pressure, allowing it to be sent to the pipes. The concrete coming into the pipes is sprayed onto the preferred surface and the concrete pouring process takes place.
Although concrete pumps are widely used in the construction industry, there are two types that are used the most. The first of these is the machines with concrete chambers mounted on the vehicle, which we see in many construction sites in daily life. Another model is generally used in larger construction areas and is used in the construction site until the completion of the construction. This type of concrete pumps usually requires higher cost and is preferred in constructions where concrete is poured too much.
What Should Be Considered While Pouring Concrete With Concrete Pump?
It is very important to consider some issues in constructions where concrete will be poured with the help of a concrete pump. First of all, it is necessary to control the quality of concrete, no matter which company it is purchased from. Some laboratory studies can be done to determine the quality of concrete. These studies can generally be carried out within the ready mixed concrete company itself and are also carried out by the site owner in free laboratories. Since the type of concrete to be used in construction has been determined beforehand, it is a necessity to compare these laboratory results with the concrete type determined.
How to Control Concrete Quality?
Controlling the quality of concrete has become a necessity with the relevant regulations and must be done at all construction sites. In order to provide the most reliable control, it is to take samples while the concrete is poured with the concrete pump. The samples taken are sent to the laboratories and their quality is checked. In cases where no samples are taken, cores from the existing poured concrete should be taken and sent to the laboratory. In case the concrete quality is not suitable, the poured concrete should be broken and concrete should be poured again.
Concrete pump is divided into two as mobile and stationary.
With the boom system mounted on the mobile concrete pump truck, concrete is easily poured to the desired location.
Fixed pump, also known as ground pump, is the type of pump that is mostly used in conditions where mobile pumps cannot reach, there is not enough space for installation at the casting site or the pump size is insufficient.
It is taken to the area where the concrete will be poured by fixed pump, lifting and transport vehicles. Metal pipes are mounted to the pump and concrete is poured to the desired area.
The use of a stationary pump requires a separate expertise. Technically, it is a more difficult machine system than a mobile pump.
Differences Between Mobile and Fixed Pump
The mobile pump is more advantageous than the stationary pump in terms of installation. It is faster and easier to install. At the end of the work, it is easier to collect and change places.
For this reason, it is generally the preferred method when casting with a fixed pump or mobile pump is not possible.
In both pump types, it is very important to design concrete suitable for the pump. Concrete that cannot be pumped is a serious waste of time.
Concrete Pumping Technique
Concrete pumping technique has revolutionized the sector in terms of being a revolution in delivering concrete to high points in today's technology. Thus, large construction projects can be completed very quickly and safely.
Concrete, which was made by hand in the past, can be carried to the upper floors by manpower with scaffolding systems, and a concrete casting that took almost a day can be poured in about 2 hours with a concrete pump today. Moreover, without adversely affecting the concrete quality.
Concrete Pump Cannot Pump Every Concrete
It is necessary to produce concrete that can be pumped into the concrete pump. Concrete pump cannot pump any concrete. Therefore, concrete producers have to make their concrete designs with pumping in mind.
The concrete pump creates a serious friction force while pressing the concrete. Due to this friction, the amount of water in the concrete decreases somewhat. This situation causes the concrete flowing in the end hose of the pump to be a drier concrete with a lower slump.
Beware of Application Errors
This is exactly where the application problems experienced at the construction site begin. The master does not like the low slump concrete flowing from the end of the concrete pump. Afterwards, the desire to intervene in the concrete starts to damage all the engineering calculations made until then.
At this stage, the duty of responsible, authorized persons at the construction site begins. It is necessary to manage this process very well. If this process is not managed well, an uncontrolled concrete that has been intervened will settle in the mold.
This is the most critical point on the construction site, in the kitchen of the business, in matters related to concrete. Controlling the process during concrete casting is very important in terms of building safety.
The dangers and risks in the ready mixed concrete sector can be examined under three main headings;
• Hazards and risks that may occur in the ready mixed concrete plant
• Hazards and risks that may occur during the transportation of ready-mixed concrete
• Hazards and risks that may occur during the pouring of ready-mixed concrete
The dangers and risks in mobile concrete pumps, which are the subject of this article, will be examined under the second and third main headings.
Concrete pumps pump the ready mixed concrete that comes with the truck mixers. Concrete
pumps are generally used as truck mounted. Truck-mounted concrete pumps are the most commonly used type of concrete pump in building construction, but there are also shotcrete pumps and tunnel concrete pumps for tunnel work. This study will focus on truck-mounted concrete pumps.