Washing of concrete pump and concrete pipeline. What you need to know about installing and setting up a concrete pump in order to achieve its productive functioning on a construction site Why do daily maintenance

In monolithic construction, concreting is one of the most important moments. The supply of the solution should be carried out directly into the formwork and at the same time promptly so that the layers do not have time to set on the surface. Then the finished structure will be homogeneous and durable. But when working at heights or in cases where the mixer truck cannot drive close to the site, there is a need for a concrete pump. This is quite expensive equipment, but you can assemble it yourself.

The simplest version of this design is a single-sided piston concrete pump. It is a hollow hydraulic cup, inside which the piston moves. Its rod through the crank is connected to the gearbox on the motor rotor, and each revolution of the shaft causes the working element to move in the sleeve. In the free part of the glass, branch pipes (inlet and outlet) are welded opposite each other with installed check valves in each. Works according to this scheme:

At half a turn, the rotor of the engine turns the crank through the reduction gear, and it pulls the rod with the piston head out of the glass.
A vacuum is created in the working chamber, and the concrete is sucked in through the inlet valve.
The next half turn of the shaft pushes the piston forward.
Due to the increasing pressure, the inlet valve closes, and the outlet valve opens, and the solution from the glass goes into the pipeline sleeve.

The supply of concrete is carried out in bursts, which is why the mixture is simply pushed out of the sleeve in portions, and does not pour at a constant speed.

The technology of the piston system is so simple that it will not be difficult to make such a concrete pump on your own. It must be remembered that the working head wears out quickly due to friction in the glass. And if it rubs on the edges and cannot fit snugly against the walls, it will no longer be possible to create a vacuum in the chamber. To increase the resource of the mechanism, two piston heads are mounted on the rod.

Materials and preparation of the main parts

You will need a scaled drawing, as well as a diagram of the movement of working parts. The latter will help determine the required rod length, crank size and piston stroke (it is usually taken equal to 60-90 cm). After that, you need to purchase or make yourself all the elements of the mechanism:

1. For a hydraulic cup, a thick-walled pipe with a diameter of 350-400 mm is required.

2. Check valves and piston head are best made of alkali resistant alloy steel.

3. An asynchronous motor and a reduction gear are used as a drive - for viscous concrete, the rotation speed of the rotor shaft is too high.

The characteristics of the concrete pump must comply with the conditions of transportation: the height of delivery and the length of the pipeline to which the unit is connected. Depending on the engine power and gear ratio of the gearbox, as well as the effective volume of the hydraulic chamber, it is possible to obtain a performance of up to 100-150 m 3 / h with pumping the solution at a distance of up to 40 m.

Special attention should be paid to the gates, since there are several suitable options:

The C-valve (BRF) is the easiest gate valve to operate and maintain, but also the least durable.
S-valve (BSF) - is considered optimal in price and at the same time quite reliable.
Rock valve (RL) is the rarest type of gate, but it is best suited for working with heavy and coarse-grained concrete, as it is less clogged with thick mixtures.

Additionally, you will need a sheet of stainless steel or ordinary iron up to 6 mm thick, as well as a metal profile (corner, channel) for the body. If the concrete pump will be transported from place to place, it is installed on a wheelbase.

DIY pump assembly guide

The pipe for the future pump cylinder must be carefully sanded from the inside, and cut holes in two opposite walls and weld short pipes under the valves. The piston head is machined on a lathe according to the dimensions of the chamber of the hydraulic cup in the drawing, brought and ground to match the inner diameter (tolerance should not exceed ± 0.1 mm). After that, valves are inserted into the nozzles, twisted and adjusted with screws.

Drive Assembly Instructions:

Mount the three-phase motor on a wheelbase or welded frame.
Install the coupling on the rotor shaft and connect the mechanical reduction gear through it.
At the outlet, mount the crank and connecting rod attached to the piston head.

The finished mechanism is closed with a protective casing made of stainless steel. It is not easy to weld seams on it, so it is better to use bending technology to the maximum. It will not be a mistake to make the case from ordinary sheet iron, but to protect it from atmospheric influences, it should be treated with an anti-corrosion primer for metal and painted.

Manual

You can use a home-made concrete pump based on standard instructions for factory-assembled units. At the site, it is connected to two pipelines: the first is connected to the bunker in which the mortar is located, the second leads directly to the installation site. The installation of the supply path is the most difficult, especially if it is necessary to pump the mixture from the bottom up. It is better to immediately prepare a schematic drawing, where you can determine the number of elbows and connections. Their number should be reduced to the minimum possible, but without fanaticism. Give preference to elements without straight and sharp corners - it’s better to have a little more of them, but the concrete pipeline should turn out to be gentle.

You also need to consider a reliable fastening of the sleeve so that the heavy composition supplied under pressure with shocks does not tear it out. For this purpose, metal farms or forests are suitable. And for safety, the vertical part of the concrete pipeline should be located no closer than 9-10 m from the pump itself. A single-seat needle valve is also installed in the riser pipe - it will not allow the reverse flow of the solution in the event of an emergency stop.

Since it is necessary to work with thick mixtures, liquid cement milk is first poured into the system. It plays the role of a kind of lubricant, avoids overloads when the engine is turned on and prevents the formation of traffic jams in the tract. Idling a test run is not recommended.

The solution itself also has special requirements:

1. The size of large aggregates is tied to the internal diameter of pipelines. The maximum fractions cannot exceed 0.3d for crushed stone and 0.4d for gravel.

2. The mobility of the mixture must correspond to class P2, otherwise the solution may separate into components in the pump chamber. In the case of liquid concrete, water will be forced through the valve faster than heavy fractions.

3. It is worth checking the draft of the test portion cone in advance - ideally, it should be from 40 to 120 mm.

During the pouring of the monolith, the risk of water hammer must be avoided. If you have not welded the pressure gauge, you will have to act on a hunch. Here it is important to gradually increase the flow at the start-up stage until the operation stabilizes, and before turning off the unit, reduce it. A sudden increase in pressure due to a change in flow rate can lead to failure of the valves.

After concreting, the system must be washed according to the instructions to remove residues. To do this, you can buy special balls of a diameter suitable for the pipeline, you will also need warm water and a compressor. Here it is important to catch the moment when heated liquid needs to be poured into the bunker. It should be fed into the chamber immediately after the last batch of mortar so that no air "pocket" is formed, but the water does not spoil the concrete itself.

1. Before stopping the pumping of the concrete mixture, it is necessary to check:

Availability and serviceability of a set of devices for cleaning the concrete pump and
supply of water required for flushing.

2. The set of devices for cleaning the concrete pipeline consists of two sections.
The first section will be made from the water pressure valve, hose and adapter; it must always be stored assembled near the pump.
The second - consists of a branch pipe with two wads. Wads, pre-moistened, are placed in the pipe shortly before the start of washing.

3. The water supply to the mixer hopper must be carried out at a rate that ensures its filling within 5 minutes.

4. Cleaning of the concrete pump and concrete pipeline is carried out in the following order:
a) the supply of concrete mix to the mixer hopper is stopped;
b) all the concrete mixture remaining in the mixer hopper is pumped into the concrete pipeline until the mixer hopper is completely empty;
c) the branch pipe of the concrete conduit connected to the valve box of the pump is disconnected from it;
d) a tray for water drainage is installed under the outlet of the pump;
e) after disconnecting the concrete pipeline from the concrete pump, the latter is thoroughly cleaned of the concrete mixture and washed;
f) after cleaning the pump, it is necessary to knock out the damper from the wedge hole of the stimulator and replace it with a suction water valve, and the valve is installed with a rubber gasket down;
g) two links are disconnected from the concrete conduit and a branch pipe with wads is connected instead of them;
h) the first flushing section (water discharge valve, hose and adapter pipe) is connected to the pump neck with wedges and to the pipe with wads - with a standard lock;
i) the pump is launched on water and must operate at low speed until the concrete mixture begins to flow from the concrete pipeline;
j) water supply to the mixer hopper must be carried out continuously during the entire cleaning of the concrete pipeline.

5. When cleaning the concrete pipeline, it is necessary to monitor the tightness of its butt seals and, in case of water leakage, knock out the wedges.

6. The tightness of the joints that let water through must be restored immediately after cleaning.

7. The duration of cleaning the concrete pump and concrete pipeline should not exceed 40 - 50 minutes.
Delayed cleaning may cause the concrete mix in the pipes to set.

8. When cleaning the concrete pipeline, it is necessary to monitor the speed of movement of the wads through the pipes, determining the position of the wads by the sound when the concrete pipeline is tapped. The speed of the wad should correspond to the speed of a slowly walking person.

9. When cleaning the concrete pipeline, it is necessary to monitor the readings of the ammeter. In the case of large readings of the ammeter and the cessation of the exit of the concrete mixture from the concrete pipeline, it is necessary to stop the pump and eliminate the blockage that has occurred.

10. In case of blockage of the concrete pipeline during cleaning, which is usually the result of water penetration into the concrete mix, it is necessary to disconnect the concrete pipeline in front of the wad and clean the link from the concrete mixture, put the wad into the released link, connect the concrete pipeline and continue cleaning.

And concrete

To clean the system from concrete residues, you will need:

1) warm water (200 liters for several cleaning cycles);

2) air compressor;

3) flushing link, designed for the supply of water or compressed air (at a pressure of not more than 10 bar);

4) flushing balls and wads in the form of a cylinder, which are made of spongy material to fit the diameter of the concrete pipeline.

Cleaning of the concrete pipeline should be carried out immediately after the completion of the delivery of the last batch of concrete, having prepared everything necessary for this before emptying the last automixer. It is important to keep in constant communication with the operator at the concreting site - he must inform when only the volume of mixture contained in the system at the moment remains to be poured. After such a signal, it is necessary to stop the supply of concrete and pour water into the concrete pump hopper - the resulting liquid mixture is maintained in the hopper at the lowest possible level, but not so much that air enters the piston cylinders (air entry will lead to a problem - it will stratify the mixture). Having completed the pouring, the operator of the concreting site gives a signal to the operator of the concrete pump - he switches the operation of the concrete pump to reverse (reverse mode) to reduce the amount of mixture in that part of the concrete pipeline that is located closer to the work site and to reduce the pressure in the concrete pipeline. Then the conduit is disconnected from the pump and extended with additional sections to reach the area intended for the discharge of the contents of the concrete conduit (they must be prepared and assembled to the desired length in advance). Be sure to put on the end pipe that leads the concrete pipeline to the discharge site, the nozzle-catcher of the flushing ball - it can fly out at a decent speed. The operator of the concreting site removes the distributing hose from his end of the concrete conduit and installs a purge nozzle instead of the last elbow, after inserting a flushing ball into the concrete conduit with plenty of water moistened (it is better to combine it - first insert the ball, followed by the wad). The start of compressed air by the operator of the concreting site and the transfer of the needle valve fingers to the “open” position must be performed as synchronously as possible - the movement of the flushing ball along the concrete conduit should not stop for a minute. It is better to carry out the flushing operation twice - it is necessary to re-supply water to the concrete pipeline through the concrete pump by switching the needle valve to the “closed” position. The hopper of the concrete pump is washed and cleaned with a stand under the outlet of the drain tray. It is especially convenient if this model is equipped with its own water pump with a hose and a container for water heated by hot gases from the exhaust pipe - it is easier to flush and remove the remains of the concrete mixture, because. no need to think about where to get hot water.

Dumping of concrete residues

Where to dump the remains of concrete after flushing the system? You can’t just dump it on the ground - this will seriously damage the soil, because the semi-liquid material will spill over the construction site. There are two options:

1) collection of washing residues in a box;

2) dumping the penultimate automixer into the bunker, having previously coordinated this operation with the concrete supplier.

In the first option, you need to assemble a square formwork box from boards (height 2,000 mm, depth 500 mm), lining it with PVC film 200 microns thick - after washing, its contents can be moved for disposal. The second option: run the discharge hose from the concrete pipeline into the automixer hopper, run it in the “loading” direction and secure it with a chain (otherwise it will jump out and splatter everything), then start the flushing process described above.

If you have any questions about renting a concrete pump truck. Call! 89856449405

Betonovody

The development of the construction industry is not just an increase in the number of houses and structures built. This is a whole complex of interconnected spheres, and the growth of production in one of them inevitably entails progress in the other. Thus, the increase in construction volumes in the 20th century inevitably led to the development of the engineering industry. The enormous human need for new buildings led to an inevitable acceleration in the pace of construction, and it was to meet these needs that numerous machines and mechanisms were created. One of these machines was a concrete pump.

In fact, a concrete pump is a machine for supplying a concrete mixture. Concrete mortar is usually prepared in special hoppers, and concrete pumps are used to speed up the process of its movement from the hopper to the place where the mortar is laid. In the process of pouring concrete its continuity is especially important, since the solution hardens quickly enough, and therefore the choice of the desired type of concrete pump must be accompanied by careful calculations.

There are two types of concrete pumping complex:

mobile - this is a concrete pump based on a car, that is, a pump for supplying concrete, placed on a truck chassis;
stationary - a concrete pump on a platform in the form of a trailer.

The main difference between these two types is power. Installation on a separate site allows you to make a concrete pump much more powerful than a car, and more maneuverable - such a concrete pump does not require a long concrete pipeline, it can be installed directly at the place of laying the concrete mixture. However, a mobile concrete pump is more maneuverable and does not require complex installation and installation before starting work. In addition, the use of a long concrete pipeline, which is impossible in the operation of a stationary installation, often turns out to be more expedient and cost-effective than the installation of a concrete pumping complex right at the place of pouring the concrete mixture.

In addition to mobility, concrete pumps are also divided into d va subspecies according to the principles of work:

piston - pumping of concrete is carried out according to the principle of forcing the mixture with a piston;
pistonless or hose - pumping of concrete is carried out using a system of rollers.

Piston concrete pumps are the most common in our country - and it is not surprising: this system has many advantages. The system for supplying concrete from the receiving hopper to the concrete pipeline is carried out in small portions, however, the hydraulic drive that most of these concrete pumps are equipped with makes it possible to supply quite smoothly, without obvious jumps and uneven movements. In addition, equipping such a piston gasoline pump with a hydraulic drive gives additional power to the pump itself. And this, in turn, makes it possible to raise the concrete mixture to a very high height.

The device of rotary concrete pumps somewhat different from the piston device. Unlike the latter, in rotary concrete from the receiving hopper does not enter the chamber, but immediately into the rubber hose. The rollers located on the outer side of the hose press it during rotation, thus pushing the solution to the outlet of the concrete pipeline.

The difference in the systems of operation of a concrete pump is due, first of all, to the needs of the construction industry. Thus, the rotary system allows the use of a mixture with a larger filler, while providing a more uniform and continuous, in comparison with the piston, concrete supply. In addition, the necessary washing of the constituent parts at the end of work with a rotary system is easier to produce than a piston one.
But both rotary and piston systems have their drawbacks. So, a piston concrete pump suffers from rapid wear of the piston part - concrete milk and filler particles, which invariably penetrate inside the mechanism, destroy it. In addition, for some types of work, the portioned, uneven supply of concrete, which is carried out by the piston mechanism as a result of its design features, is unacceptable.
The main problem with the rotary system of a concrete pump is low productivity. Such concrete pumps are preferable to use for a small amount of work. Another disadvantage is the very rapid wear of the hose through which the feed is carried out. And the larger the filler, the higher the fraction of crushed stone or gravel in its composition, the faster the hose breaks under the influence of solid particles.

Betonovody

Strictly speaking, only the mechanism for pumping the concrete mix can be called a concrete pump. However, it is simply impossible to imagine the operation of a concrete pump without additional attachments. And the main such addition to the concrete pump is the concrete pipeline.

Betonovod- This is a pipe system through which concrete is sent to the place where the mixture is laid. The technical parameters of pipes that can be used as a concrete pipeline are indicated in the concrete pump passport. Thus, depending on the power, throughput and some other characteristics of the concrete pumping machine, it is allowed to use pipes of one or another size (length and diameter) for pumping the concrete mixture.
However, in some cases, technological maps allow the use of pipes of a smaller diameter than is prescribed in the technical data sheet of the concrete pump. Most often this happens when the concrete pump does not start at full capacity: the low flow rate of the mixture and the low operating pressure in the pump itself can reduce the wear of the concrete pipeline by using pipes of a smaller diameter.
According to the technical regulations, the determination of the ratio of the composition of the concrete mixture with the power of the concrete pump, the length of the concrete pipeline and the diameter of its pipes is determined in the laboratory. Laboratory specialists use the term "pumpability" - the optimal combination of all the above parameters for the most efficient work.

Thus, according to laboratory conditions, for maximum pumpability aggregate size in concrete mix- coarse sand, gravel, crushed stone - must be at least 3 times smaller than the diameter of the concrete pipe. The ideal percentage of these aggregates is from 36% to 45% of the total mass of the mixture, it is this value that corresponds to the most efficient operation of the concrete pump.

However, pipes are not the only component of a concrete pipeline. Depending on the construction conditions, on the need to supply concrete to different heights, on the remoteness of the concrete pump from the place of pouring the solution in the concrete pipeline system, it is allowed to use various gutters, trays and so-called trunks - large flexible corrugated hoses. The length, height of the walls and the diameter of the gutters are regulated by the characteristics of the beet pipe system. The angles of inclination during the installation of gutters and trays exactly - just like pipes - have their own parameters of tolerances and angles of inclination. And trunks or sleeves made of woven rubber are most often used as the final section of the pipeline, that is, directly for the final distribution of the solution. Their diameter should not exceed 125 mm - this is the maximum allowable value for this kind of distribution systems.

Concrete plant

Despite the apparent complexity of the principles of operation of a concrete pump, the installation for supplying a concrete mixture is quite simple.
The main element in such a complex is, of course, the concrete pump itself, both mobile and stationary. A receiving hopper is attached to it, equipped with a special vibrating grating - it is the vibrating grating that prevents aggregate fragments larger than the dimensions specified for this concrete pump from entering the concrete pump. The receiving hopper serves to accumulate concrete from the mixer before entering the concrete pump and its further pumping through the concrete pipeline system.

The connection of pipes directly to the concrete pipeline itself must also be carried out strictly according to a certain scheme. So, for an optimal level of concrete conductivity, it is allowed to mount concrete pipes strictly at angles in fifteen; 22.5; thirty; 45 and 90 degrees.

In addition, a water pump is an indispensable part of the concrete supply complex. It is necessary for constant flushing of the concrete pipeline, and in order to prevent excess water from entering the solution, a hatch system is installed in the concrete pipeline to drain them. The final touch of the assembly of the concrete pumping complex is the installation of a reflector - a special visor at the end of the concrete pipe, designed to prevent the mixture from scattering to the sides.

Installation of concrete pipes is carried out according to a pre-designed scheme. When developing it, various calculations are carried out, showing the dependence of the speed of the flowing concrete mixture on the length of the concrete pipeline and the power of the concrete pump itself.

The main condition for laying a concrete pipeline is the observance of two parameters that have the maximum impact on the speed and efficiency of the entire concrete complex. The first is the shortest distance between the concrete pump and the concrete placement. The second is the minimum number of pipe bends. The maximum allowable bending angle is 90 degrees, however, when laying a concrete conduit, it is still recommended to avoid such sharpness.

It is not enough just to connect the pipes- you must first fix them on the supports. Those sections of the concrete pipeline that are located horizontally are laid on linings or formwork, while pipes located at an angle to the surface or even in a vertical position must be fixed to scaffolding or masts. During large-scale construction, special concrete supports are pre-created for inclined sections of the concrete pipeline. In this case, the first vertical section of the concrete pipeline must be installed at least 8 meters from the concrete pump itself. In this place, in addition, according to the technical regulations, the installation of a valve is also required - in order to prevent the outflow of the concrete mixture.

The correct calculation of the laying of the concrete pipeline minimizes the number of changes to the pipeline itself, which, in turn, reduces the total time of pouring concrete and has a positive effect on the overall costs of construction.

Concrete pump: getting started

After the installation of the concrete pumping complex is completed, it is time to check the entire system. According to the technical regulations, the operation of a concrete pump without preliminary tests is not allowed. The passport of the concrete pump must always indicate test hydraulic pressure parameters, which should indicate the successful operation of the mechanism.

After completion of hydraulic tests, a test pumping of the mixture through the mounted concrete pipeline is carried out. This is necessary in order to achieve optimal conditions for concrete conduction and adjust the operation of all valves and the centrifugal water pump used to flush the system.

The adjustment of the mixture and the concrete supply system is completed by lubricating the inner surface of the concrete conduit. For these purposes, a special mixture is made - either a plastic mass of lime and water, or a concrete solution with a large amount of fine river sand. A dense dough-like mass, passing through the pipes and gutters of the concrete pipeline, settles on the walls, forming a protective lubricant that facilitates the movement of concrete in the process of further work.

Recently, however, for lubrication, manufacturers of concrete pumps recommend using a special chemical composition - its quantity is required much less than concrete dough or concrete milk.

Problems in the operation of the pipeline system

As in any mechanism, failures and malfunctions can occur in the concrete pipeline operation system. However, as statistics show, the main cause of problems is non-compliance with safety regulations during the operation of the system and incorrect calculations during the installation of the concrete pipeline and the density of the concrete mixture.

According to building regulations, idle concrete pump is not allowed with the mixture pumped into it more than 15-20 minutes. After this time, concrete begins to harden and further operation of the pump becomes not only difficult, but frankly impossible. The hardened concrete has to be literally picked out from the concrete pump and concrete pipeline - the process is complex, long and laborious.

If in the process of pouring concrete it is necessary to take a long break - from an hour or more, then according to the technical regulations, it is necessary to start the concrete pump every 10 minutes at low power. Within 10-15 minutes, the pump should pump the concrete solution through the concrete pipeline system at low speed - this will avoid the mixture from setting and blocking the pipes.

The impossibility of such an "idle" pumping entails the obligatory emptying of the concrete pumping system and its no less obligatory flushing.

Failures in the operation of a concrete pump and a concrete pipeline are forced downtime and, as a result, a violation of the construction schedule, failure to meet deadlines. Unfortunately, most of these problems are stopping the flow of concrete through pipe systems due to violations of operating conditions.
Concrete blockage is the formation of a dense plug of concrete mortar and fractions, which makes it difficult or impossible for the further normal operation of the concrete supply system. There are several main reasons for creating this concrete plug:

long downtime of the fuel pump without idle pumping, which is mandatory for technical indicators;
improper installation of the concrete pipeline, due to which the mixture is divided into fractions at sharp turns;
poor lubrication of the walls of the beet duct before starting work;
poor flushing of the concrete pipeline and concrete pump after previous operation;
the formation of sagging on the walls of the concrete pipeline due to incorrectly composed concrete mix;
insufficient operation of the water pump in the concrete supply system.

Of course, there are a number of objective reasons for the incorrect operation of the concrete pipeline, but it is negligence that causes most of the breakdowns. And to prevent the formation of concrete by observing the requirements of operation is always easier than to remove the malfunction.

The blockage is removed with the help of special wads and banniks, breaking it and pushing concrete particles to the end of the concrete pipeline. In this case, the concrete pump must be turned off without fail. However, finding the site of a possible blockage can cause certain difficulties. That is why it is so important to use the work of professional concrete workers in such work.

One of the most important stages in the service of a concrete pump truck is its regular cleaning, which must be carried out daily before and after work. Before starting vigorous activity, it is necessary to flush the mechanism with a starting solution, and then treat it with water and compressed air. Flushing the concrete pump truck in this order is necessary to maintain the equipment's suitability for daily and trouble-free operation. The slightest omission can cause failure of important parts and mechanisms of the unit. If your core business is concrete pump rental, the quality of functioning of the copies provided to customers must be impeccable.

Why carry out daily maintenance?

In the event that the mixture is fed without preparation into a dry-coated concrete pipeline, the risk of clogging the supply line and the appearance of plugs from the solution, which can stick to the walls of the container, increases. The starting mixture used for cleaning can be specialized and purchased from specialized companies or homemade. The concrete pump is flushed using the following resources:

200 liters of water for several stages of cleaning;
Air compressor;
Flushing link capable of operating at an applied pressure not exceeding 10 bar;
Wads for washing from a sponge of a cylindrical or spherical shape, the size of which will correspond to the diameter of the concrete pipeline.

The concrete pump truck must be cleaned immediately after the final batch of concrete has been unloaded from it. In this case, all the necessary cleaning materials must be prepared in advance before the container is emptied. The operator at the site where the concrete is being poured must monitor the delivery of the last batch in order to immediately begin the flushing procedure.

Algorithm of the cleaning process of the concrete pump truck

The launch of the starting mixture into the functional volume of the pump must be carried out using a wad and a ball, which are also necessary at the end of the work. Tools made of sponge material are easy to dip into the container and are pre-wetted with starter mix to make the cleaning process more efficient. The uniformity of the distribution of the composition guarantees the washing off of the adhering composition from the walls of the concrete pump. When the flush kit is introduced into the unit, the needle valve pins must be opened and closed when service is complete.

Immediately after such treatment, the container is filled with a solution that is in its volume during the entire shift in order to avoid the appearance of traffic jams from the air. If the operator notices delays and malfunctions, it is necessary to use reverse pumping and direct operation so that the concrete mass does not delaminate and is constantly mixed. In the case when the truck-mounted concrete pump has been at rest for more than thirty minutes, it is necessary to clean it according to the same algorithm as at the beginning or at the end of the shift.

The procedures are carried out for half an hour with the use of up to two cubic meters of hot water, which is sent to the container through a hose that is resistant to pressure of no more than 10 MPa. Water heating can be carried out due to the exhaust gases produced by the pump. Rapid preparation must be arranged with great care, especially if the ambient temperature is constantly fluctuating, low or too high, so that it happens in drought or frost.

Concrete pumps are cleaned after the operator's command. Water is poured into the hopper up to the level of the pistons to prevent air from entering the cylinders. At this time, the final part of the solution is supplied to the treated area. Upon completion of the filling, the reverse mode is activated. The pressure is reduced, the remnants of the composition are mixed with water in the hopper, the balls are launched and the container is cleaned by blowing.

The mixture obtained during cleaning is drained, a washing kit is introduced into the concrete conduit and compressed air is supplied, which creates the necessary conditions for the continuous movement of the sponge in the concrete conduit. Then the procedure is repeated with the use of water and in the final the usual rinsing is carried out, after which the unit is again ready for high-quality functioning.

How to get rid of leftover concrete mix?

The solution of concrete has specific physical and chemical properties, therefore, volumes of material unsuitable for further use must be eliminated, taking care of the place of discharge in advance. When cleaning concrete pumps, you can't just dump the mass on the ground, so you will need special collection boxes or use one of the automixers.

In the first case, suitable containers are needed, the height of which will be at least 2 meters and the depth - half a meter. A kind of formwork is lined with PVC film and all residues washed during cleaning can be easily transported for disposal.

The second option involves the use of a hose and a hopper, into which the remains of the mixture are immersed, followed by starting in the "loading" mode, after which flushing begins.

Cleaning a concrete pump truck is an important procedure that directly affects the quality of the equipment, so you should prepare for it in advance by thinking through all the nuances and preparing the necessary consumables.