Concrete pump Machines

CONCRETE PUMP

Mansoor Azam Qureshi

NUST

Islamabad

A concrete pump is an extremely useful item in the construction business as it can distribute large volumes of concrete in a short amount of time.

The system for pumping concrete essentially consists of a hopper into which the concrete is discharged from the mixer, which in turn, feeds the concrete pump itself and finally the delivery pipelines through which the concrete is delivered.

Pumps are available in a variety of sizes, capable of delivering concrete Sustained rates of 10 to 150 cy/hr and higher. Effective pumping distance varies from 300 to 1,000 ft

horizontally 100 to 300 ft vertically [7

CONCRETE PUMP

TYPE OF PUMPSPISTON PUMPS

Piston pump is one of the most common reciprocating positive displacement pump.

Used in lower to moderate flow (2000 PSI) pressure applications.

These may be mounted on trailers or trucks.

Squeeze type pumps are smaller portable peristaltic type pumps. The concrete from the collecting hopper is fed by rotating blades

into a flexible pipe connected to the pumping chamber. The rotating rollers mounted on planetary drives progressively

squeeze the flexible pipe and thus push the concrete into the delivery pipe.

TYPE OF PUMPSSQUEEZE PUMPS

COMPARISON OF PUMPS

Piston Pumps Squeeze Pumps

High efficiency High pressure (up to

1,000 bar) Low flow and pressure

ripple (due to the small dead volume in the workspace of the pumping piston)

Low noise level High reliability

No waste on the floor or in line

Quick and easy to clean Low hopper for Mini-

mixer deliveries Lightweight delivery line Safe to use at only 25bar

pump pressure Quiet pumping process Delivery rate infinitely

variable, forwards and reverse

Ease of maintenance .

PUMPING SYSTEMS Pump with pipeline

Stationary pump mounted on frames, trailers or trucks are used.

Steel pipeline of 3 to 8 in dia are used. Hopper is used to feed pump and flexible hose with

nozzle is used for spreading concrete. Pump and boom Combination

Pump is mounted on truck with a boom Steel pipe section form part of folded boom which is

extended to deliver concrete. Limited delivery approach but flexible and mobile system

Pump and Tower mounted boom is combination of above systems. Suitable for high-rise concrete construction

PUMPING SYSTEMS

SELECTING THE CORRECT PUMP

Length of horizontal pipe. Length of vertical pipe. Numbers of bends. Length of flexible hose Diameter of pipeline. Changes in line diameter. Slump of concrete.

EXAMPLE

A concrete pour job requires an average output of 45 cubic yards/hr., but we will be pumping only 75% of the time. The rest of the time will be spent moving hose, removing pipe lengths, waiting for concrete trucks, etc. We will use 5″ diameter pipeline for our job. We will have the following pipeline lengths: 30 ft. horizontal, 1 long sweep elbow, 250 ft. vertical, 2 long sweep elbows, 150 feet horizontal, 40 feet of 5″ rubber hose. We will specify a slump of 3-4″,

Pumping volume required= 45/ 0.75 = 60 cy/hr Pipe length for friction /loss

Horizontal length= 30 ft Length for vertical height= 250 ft Equivalent length for hose= 3 x 40 = 120 ft Equivalent length for bends = 3 x 10 = 20 ft Horizontal length= 150 ft Total = 250+120+30+20+150

=580 ft

•each 90° bend with a radius of 250 mm (boom elbow) = 3.5 feet•each 90° bend with a radius of 1 meter (long sweep) = 10. feet•each 30° or 45° bend with a radius of 1 meter or 250 mm = 3 feet

EXAMPLE

Enter uper right part of nomograph with volume of concrete required and go to size of pipe to determine entry point for lower right graph

Enter lower right graph and touch pipe length to determine flow requirement

Enter lower left graph and touch slump line at 3 in slump to move up to power required= 675 psi

To take care of vertical height of pumping add 1.105 psi pressure for each vertical foot of concrete movement.

Total pressure= 675+250 x 1.105=951 psi

Select appropriate pump from upper left graph