Turbosol Beton Master, Operation And Maintenance Manual

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USE AND OPERATION
7
561270 - IS19/07 - EN
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7 - USE AND OPERATION
7.1 OPERATING PRINCIPLE
At the core of the BETON MASTER is the pumping assembly, consisting of: the lower hopper (FIG. 29-REF. 1), which
containes the S-valve (FIG. 29-REF. 2), and the mixer (FIG. 29-REF. 3). Behind the hopper are two oil-hydraulic jacks (FIG. 29-
REF. 4) that operate the S-valve; two pumping cylinders take in the concrete aspirated from the hopper. A rubber piston inside
each pumping cylinder aspirates/pumps the concrete. The alternating motion of the rubber pistons is produced by two hydraulic
cylinders (FIG. 29-REF. 6) controlled by a solenoid valve (FIG. 29-REF. 7); the valve is located above a hydraulic unit coupled
to the bottom of the pistons. Above the hydraulic unit there is also the solenoid valve that controls the jacks (FIG. 29-REF. 8).
Between the pumping cylinders and the hydraulic cylinders there is a small tank (FIG. 29-REF. 9) containing water for cooling
and lubricating the pistons during their stroke.
The fresh concrete is poured into the hopper; the grid inside the hopper prevents the entrance of larger particles and is
equipped with an electric vibrator to facilitate the passage of the concrete. The concrete is first aspirated from the hopper and
then pumped towards the conveying pipes. The alternated sucking and pumping is governed by the S-valve, which puts the
pumping cylinders in communication with the conveying pipe, alternately. The pumping is oil-hydraulically operated with a
variable-displacement hydraulic pump. This type of pump makes it possible to change the concrete's flow rate through a
manually-operated oil-hydraulic control.
Pumping is monitored by sensors that send their readings to the electronic control panel; the panel controls the pumping
assembly's switching sequence.
There are four sensors: two control the jacks and are located next to them and two control the hydraulic cylinders and are
located inside the tank.
Pumping can be started, stopped or reversed by the operator using a cable remote control (supplied) or a radio control
(optional).
3
2
4
5
6
7
1
9
8
FIG. 29
7.2 PUMPABLE SLURRIES
BETON MASTER works with two kinds of slurries:
- Pumping: general-purpose concrete, normal or controlled-shrinkage micro-concrete, mortar for micropiles, common mortars,
muds and bentonite.
- Spraying: micro-concrete (shotcrete) for lining and consolidating tunnels, slopes, embankments, swimming pools, canals.
All pumpable mixes can be reinforced with flexible or rigid fibres and sprayed together with set accelerators.
The composition of the concrete or shotcrete is based on supply agreements that do not depend on the machine.
In order to avoid problems during pumping, the following conditions must be respected:
- the maximum particle diameter should be between 1/3 and 1/4 the diameter of the hose;
- the grading envelope of the mix must be suitable for pumping;
- the sand's fineness modulus should be between 2.4 e 3;
- high slump values should be used to facilitate pumping of non-segregable mixes.