HOISTING EQUIPMENT

SOUMENDRA ROY ODED DARLONG PRANJAL GUPTA ROHIT BANSAL

ADVANCED BUILDING TECHNOLOGY

SUBMITTED TO : Ms Prasanthi

SCHOOL OF PLANNING AND ARCHITECTURE, VIJAYAWADA

CONCRETE PUMP

INTRODUCTIONArchitectural terms Hoisting means Lifting loads ,Light or Heavy, with the help of machines or any other mechanical means. Generally Known as Vertical Traction.

Regular hoists may use a wire rope which can be wrapped around something of cylindrical shape or they may use a load-chain which can be raised by a pulley to involve the chain to lift the loads. Electronic hoists come with a hoist controller which can have a number of features based on the preset specifications. Electrical hoists are considered as the most economical form of hoists as they are cost effective and it does not take a lot of efforts to repair them. Manual hoists need extensive power to run them while electrical hoists bring down the cost on man power and ensure more efficiency.

1. Crane and it's components, 2. Elevators, 3. Lift cables, 4. Monorails, 5. Jacks, 6. Hoisting buckets, 7. Lever operated hoist, 8. Pulleys, 9. Wire rope hoist, 10. Stacker, 11. Wheels, 12. Concrete pump13. Tail gates and many other miscellaneous

hoisting products

CONCRETE PUMPS

2. The second type of concrete pump is attached to a truck. It is known as a trailer-mounted boom concrete pump because it uses a remote-controlled articulating robotic arm (called a boom) to place concrete with pinpoint accuracy. Boom pumps are used on most of the larger construction projects as they are capable of pumping at very high volumes and because of the labor saving nature of the placing boom. They are a revolutionary alternative to truck-mounted concrete pumps.

1 . The first main type of concrete pump is either mounted on a truck or placed on a trailer, and it is referred to as a line pump or trailer-mounted concrete pump. This pump requires steel or rubber concrete placing hoses to be manually attached to the outlet of the machine. Those hoses are linked together and lead to wherever the concrete needs to be placed. Line pumps normally pump concrete at lower volumes than boom pumps and are used for smaller volume concrete placing applications such as swimming pools, sidewalks, and single family home concrete slabs and most ground slabs.

TYPES BASED ON UTILISATION

Normal line pump

Boom pump

CONCRETE PUMPS

Two types of concrete pumps are used:Direct-acting, horizontal piston type with semi-rotary valves set to permit always the passage of the largest aggregate particles. This type of pump can cover a horizontal distance of 1000 m and a vertical distance of 120 m. The concrete is fed in by gravity and is also partially sucked in during the suction stroke. The valves open and close with definite pauses so that concrete moves in a series of impulses, but the pipe always remains full. These pumps are capable of pumping 130 m3 of concrete per hour with 8 inch pipes.

Squeeze pumps or peristaltic pumps are the ones that use vacuum pumping. These pumps can cover a distance of 90 m horizontally and 30 m vertically, and are capable of pumping 20 m3 of concrete per hour using 3 inch pipes.

Direct-acting, horizontal piston

Squeeze or peristaltic pumps

TYPES BASED ON PUMPING ACTIONS

COMPONENTS OF A CONCRETE PUMP TRUCK

1. Sub frame2. Frame connection for boom base3. Pedestal, railing and ladder4. Boom support5. Pump unit with main control block6. Concrete delivery pipeline

7. Additional water tank with water pump8. Boom base with outrigger9. Control panel10. Distributor boom11. Distribution gear box with hydraulic pumps

INSTRUCTIONS FOR USAGE

COMPONENTS OF A CONCRETE PUMP

The bends in the pipes conveying concrete from the pump should be minimal in order to avoid losses. These should not be sharp. Each 10o bend is equivalent to an extra length of pipe of 1 m.

The pipe diameter should be at least 3 times the maximum aggregate size. Large aggregates can especially tend to get blocked near the bends.

The economy of pumping depends on the number of interruptions. Each time, the priming of the pipes using mortar is required (0.25 m3/100 m of 6 inch pipe), and the pipe also has to be cleaned.

Aluminium pipes should be avoided, as the Al reacts with alkalis in the cement, and leads to the evolution of hydrogen gas. These gases tend to introduce voids in the concrete, which reduce the efficiency of pumping.

Pumping enables concreting of inaccessible areas. Moreover, the direct conveyance of concrete from the truck to formwork can avoid double handling of the concrete

1: Drive cylinder, right 6: S-valve2: Control block 7: Wear plate3: Water box 8: Tilting drive4: Conveyor piston 9: Conveyor cylinder5: S-valve system with 10: Drive cylinder, left agitator

REQUIREMENTS FOR PUMPED CONCRETE

Concrete mixture should neither be too harsh nor too sticky; also, neither too dry nor too wet A slump between 50 and 150 mm is recommended (note that pumping induces partial

compaction, so the slump at delivery point may be decreased) If the water content in the mixture is low, the coarse particles would exert pressure on the pipe

walls. Friction is minimized at the correct water contents. The presence of a lubricating film of mortar at the walls of the pipe also greatly reduces the friction

High cement content in concrete is generally beneficial for pumping Two types of blockage to efficient pumping could occur: (1) Water can escape from the mixture

if the voids are not small enough; this implies that closely packed fines would be needed in the mixture to avoid any segregation. The pressure at which segregation occurs must be greater than that needed to pump concrete. (2) When the fines content is too high, there could be too much frictional resistance offered by the pipe. The first type of blockage occurs in irregular or gap-graded normal strength mixtures, while the second type occurs in high strength mixtures with fillers. In order to avoid these two types of failure, the mixture should be proportioned appropriately

Other mixture factors that could affect pumping are the cement content, shape of aggregate, presence of admixtures such as pumping aids or air entrainment. Air entrainment is helpful in moderate amounts, but too much air can make pumping very inefficient

When flowing concrete is being pumped, an over-cohesive mixture with high sand content is recommended. For lightweight aggregate concrete, pumping can fill up the voids in the aggregate with water, making the mixture dry.

READYMIX CONCRETE AGITATOR FEEDS CONCRETE INTO THE BOOM PUMP WHICH IS POURING CONCRETE ON THE SITE

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