How Tower Cranes Work

Tower cranes are a common fixture at any major construction site. They're pretty hard to miss -- they often rise hundreds of feet into the air, and can reach out just as far. The construction crew uses the tower crane to lift steel, concrete, large tools like acetylene torches and generators, and a wide variety of other building materials.

Tower Crane Image Gallery

When you look at one of these cranes, what it can do seems nearly impossible: Why doesn't it tip over? How can such a long boom lift so much weigh­t? How is it able to grow taller as the building grows taller? If you have ever wondered about how tower cranes work, then this article is for you. In this article, you'll find out the answers to all of these questions and more!

Safety requirements for knowledge, concrete construction machinery construction operatives

Certificates 1. concrete pump truck, concrete truck mixer operator must go through safety training, passing the examination and achieved the qualification certificate issued by the competent authority.

2. The operator must be in good health. Suffering from the disease and hinder the safe operation of mental disorders are not allowed to operate machinery and equipment. Drinking or taking sedatives are not allowed to operate machinery and equipment.
3. The operations should observe or inspect machinery, personnel and environment around, not allowed to leave their posts.
4. The operator must wear safety protective equipment as required. When the job long hair can not be exposed, workers should wear work hat.
5. No arbitrary removal of machinery equipment lighting, signal, instrumentation, alarms and guards. Periodic checks should be required, adjust the security guards.
6. Mechanical transmission equipment exposed rotating parts and hot, live parts shall be provided with guards and other security facilities and has obvious safety warning signs.
7. Do not touch the mechanical operation of moving parts, repair and maintenance work.
8.We must comply with the relevant provisions of the traffic management department  mechanical driving road in the community.
9. machinery through the bridge before, you should understand the carrying capacity of the bridge beam, after confirmation by the security before the low speed. Non-emergency steering and brakes in the bridge deck E. Care must be taken before the bridge opening by height limit, only after confirmation by security.
10. Before self-propelled machinery operation, must be checked, braking, steering, signaling and safety devices should be complete and effective.
11. When the ramp down, shall lateral park. Longitudinal parking, must block cover, and the work floor auxiliary braking device. Ensure brake reliable, the operator before leaving. Rainy season should be parked in the higher ground of mechanical solid ground.
12. mechanical operations, shall not vertically machinery.
13. When working near machinery power stations, substations, power distribution room, not allowed to enter the danger zone. When working near power lines, the distance from the high-voltage machinery and work equipment trajectory body should meet the following requirements. The minimum safety distance concrete machinery and overhead transmission wires

Twin Shaft Mixers

The Sicoma twin shaft concrete mixer was designed in Italy 16 years ago, and it has been refined to give you the outstanding product that you see today. The MAO series heavy duty mixers are the most widely used twin shaft models in the world today; over 6000 in use, worldwide, in ready-mix, precast, block, paver and dam applications. These mixers produce well over 1 million cubic yards of concrete every day. Their compact size allows them to be retrofitted into existing plants, in most cases doubling throughput without the need for two mixers and splitting of material feeds.

The art in concrete mixing is to make a batch of concrete quickly and completely. The MAO's powerful compulsory spiral mixing action throws particles from each side of the mixer towards the center, where they combine; the water is forced through powerful jets into the mix, where it is absorbed completely, allowing the cement slurry to coat all the aggregate particles uniformly, forming the strongest concrete.

Because the mixing occurs in free space above the mixer floor, the wear on the liner plates is very low; the outer 70% of the lined surface is rarely touched by concrete. Only the rows of tiles close to the discharge door will need replacement, and you'll be surprised at how long they last.

The MAO's features go farther than many other mixers of its class. Its strong frame, triple shaft seals, more efficient gear reducers and electronic alarm unit as standard equipment mean that you have peace of mind. And our 5 year warranty shows you that we are very confident in its reliability!

Truck-Mounted Boom Pump history

Our concrete pump truck boom started started in the early 1980s, initially basically introduce CKD, or through the introduction of technology and trade binding mode technology to produce parts with some combination of the introduction of production.Early 1980s, domestic concrete pump was less than the total holdings of 200 units, concrete pump truck boom started is a blank. In the meantime, some of our large concrete pouring works are basically rely on imported equipment.After nearly 20 years of efforts, China's boom started concrete pump made considerable development, design standards, and manufacturing capabilities have been greatly improved. According to statistics, a manufacturer of concrete delivery pump has reached more than 100, distributed throughout the country. But because each manufacturer's technical level, production technology, production capacity is uneven, the product gap is also large.Our concrete pump truck boom started in recent years has been rapid development, stability and the process of the product, although not as good as abroad, but in price, service and other aspects, our products with a clear competitive advantage, and more in line with The actual construction of the domestic situation. Among them, Zoomlion, Sany concrete pump truck boom started in the development of walking in front of peers. Zoomlion developed a "concrete pump" standard, also developed a pump remote maintenance and positioning system. Sany concrete pump, both in the pressure pumping, pumping capacity, or stability, reliability, etc., with the famous brand products can be comparable to its pumping machinery products have been selling to the Middle East, North Africa and South Asia and other places.As can be seen from the national patent office issued 123 pumping machinery patents, patent domestic pumping machinery acquired mainly in the pump, pump the gate and pump control, hydraulic, electrical, etc, indicating that domestic enterprises in these areas more emphasis on research, which is relatively weak domestic pumping machinery fields. Followed by spare parts and jib aspect of the pump, the number of patents for nearly 20 years, only 100 items, which also includes foreign enterprises to apply for patents, which shows that our business-to-boom started pumping machinery R & D spending is also inadequate.Domestic concrete pump truck boom started late start because the past two years domestic enterprises have stepped up the introduction of technology and quality control, design and development of concrete pump truck boom started, technological innovation with independent intellectual property rights of a domestic boom started concrete booster pump development. The development trend of the major components of technology also represents the development direction of the domestic boom started concrete pump vehicle.Chassis engine to power the boom started concrete pump work and travel. Thus, the chassis engine performance directly affects the performance of concrete pump truck boom started. Currently boom started concrete pump commonly used with Volvo, Mercedes-Benz, Isuzu chassis, 2005 chassis has been using domestic boom started concrete pump market. With the domestic boom started concrete pump market matures, vehicle declining profit margins, to meet the different needs of users, the use of domestic and imported chassis chassis concrete pump truck boom started will occupy its own place in the market .
 Domestic boom started concrete pump truck chassis selected almost all imported chassis. Wherein Isuzu chassis technology is mature, improve services in the country, the price is relatively cheap. Current domestic boom started concrete pump truck chassis with engines meet Euro Ⅱ or above criteria, the cities can meet the environmental requirements.Concrete pump truck boom started work often limited by the upper space, requiring a minimum height of the boom unfolded top, folding boom four or less generally use a single R or Z-shaped pattern. More than five boom due to space limitations, the type commonly used to achieve RZ combination folding boom extension and retraction, applicability, enhanced mobility and flexibility, especially in the construction of tunnels and indoor work efficiency has improved significantly. Initially domestic boom length 37 m, mostly in the last two years have increasingly long trend, the next few years, with the increasing demand, there will be a longer boom concrete pump truck to the market. Concrete pump truck boom started the leg work is often limited by the floor space, especially large boom started concrete pump. The manufacturers had to combine their experience, to find a solution. Thus, the boom started concrete pump outrigger design showing a personalized, diversified characteristics. Currently on the market to double swing and X-shaped legs mostly.

Longer and more flexible fabric boom outrigger structure, is the main trend of development of concrete pump truck boom started, many folding mixed use, make more flexible arm design, lighter weight. Legs in the form of more and more flexible, extensive use of unilateral leg to make concrete pump truck boom started to adapt to different site conditions.Pressure higher throughput greater will be the future trend of the domestic boom started concrete pump central pumping system. Early design domestic boom started concrete pump, concrete bore of about 200 mm, mostly concentrated in the output displacement 100 cubic meters / hour or less, since 2004, concrete delivery cylinder bore of 200 mm has exited pump products. Currently, the market is the most common delivery bore of 230 mm, the output of the displacement of 120 cubic meters / hour. With the boom started concrete pump truck boom is getting higher, bigger and bigger models, the delivery cylinder bore is also bigger and bigger, the country has reached the maximum of 260 mm bore, concrete output displacement is greater, But viewed from the machine configuration overall, due to overall height and width of the frame by, a larger cylinder bore concrete delivery has been greatly restricted the application of concrete pump truck boom started. Meanwhile, the concrete delivery cylinder bore, the greater the output displacement, engine power will be required the greater the chassis, when the working machine large displacement, the vibration caused by the boom will be greater. Therefore, the large bore boom started concrete pump, such as trying to replace a bore of 230 mm bore general, we need to do a lot of work, go a long way.Due to the progress of the increasingly high demand, now requires pumping capacity of 80 to 120 cubic meters / hour of engineering, more and more large displacement will become the future development direction of concrete pump truck boom started.

Concrete pump operating systems

The late 1960s, the introduction of 16 meters Putzmeister boom pump; in 1986, it developed the world's longest boom pump 62 meters birth. All told, the Germans with nearly two decades, the boom lift height of nearly 40 meters. And again this record refresh, and wait for the full 20 years, this time the protagonist has become China enterprises. Concrete pump in it step by step with the new new technology:

(1) energy conservation, environmental protection has become the development trend of pump.
Improve concrete pump energy saving, environmental performance has become a trend, wind cooling gradually to replace water cooling, engine emission standards also increased, mostly reach Europe Ⅱ or Euro Ⅲ standard.
(2) the control system more functional.
Concrete boom pump started nearly two years of rapid development of electrical systems, domestic manufacturers to produce concrete pump electric control system from the traditional PLC control to a dedicated controller and computer intelligent control, touch screen, you can achieve human-computer dialogue, The various operating parameters can be stored and displayed on the vehicle to achieve automatic control. Once the machine is running fails, except alarm outside also brings up the relevant parameters for failure analysis, diagnosis. Meanwhile, the application of intelligent control systems technology boom, boom, etc. can achieve a high level of amplitude and smart casting.
(3) structure is more applicable.
Concrete pump truck boom started work often limited by the upper space, requiring a minimum height of the boom unfolded top, folding boom four or less generally use a single R or Z-shaped pattern. More than five boom due to space limitations, the type commonly used to achieve RZ combination folding boom extension and retraction, applicability, enhanced mobility and flexibility, especially in the construction of tunnels and indoor work efficiency has improved significantly. Domestic boom length of nearly two years longer and longer trend, the future will have more concrete boom pump to the market. In addition, the boom started concrete pump leg work by floor space is often limited, especially large boom started concrete pump, concrete pump truck boom started therefore outrigger design showing a personalized, diversified characteristics.
(4) Concrete greater displacement volume.
Centre higher pressure pumping system, greater throughput, will become the future development trend of the domestic boom started concrete pump central pumping system. With the boom started concrete pump truck boom is getting higher, bigger and bigger models, the delivery cylinder bore is also bigger and bigger, and because the progress of the project have become increasingly demanding, requires pumping capacity at 80 ~ 120m3 / h of the project, more and more large displacement will become the future development direction of concrete pump truck boom started. In addition, more and more high pumping pressure. Concrete outlet pressure has now reached 22MPa, but also continue to improve the trend.

Precautions self-loading concrete mixer

Self-loading concrete mixer mixes the barrel wall radially arranged stirring blades. After the operation, the mixing drum rotation about its horizontal axis, adding mix barrel material, is raised to a certain height blade, falling by its own weight, this cycle of movement, to achieve uniform mixing effect. From a simple fall concrete mixer structure, generally stirred plastic concrete based.The following technical staff for you always said operating self-loading concrete mixers note:

(1) before the new machine should be in accordance with the requirements of the concrete mixer instructions for use of the systems and components necessary itemized inspection and commissioning. Empty running, check the direction of rotation of the mixing tube or stirring the leaves, the operation of the working device, braking, confirm normal only job.(2) stationary concrete mixer should be installed on a solid pedestal. When long-term use, should anchor bolts embedded; if short-term use, laying sleepers in the flat base and find stable.(3) The mobile concrete mixer, should be installed on a flat hard wood or aerodromes square brackets stand firm and keep the tire from the horizontal force. If you use more than three months or more, remove the tire should keep the axle ends should be prepared to clean rust prevention work.(4) provided for some of the need to dig a pit on a hopper agitator, which should elevate the compacted around the pit to prevent surface water flowing into the pit. The bottom end of the bearing surface on the track frame material compacted or paving should be followed by a support frame shall be of wood, to prevent deformation of the track work.(5) concrete mixer start should be made after mixing tube reaches the normal rotation speed of the material, the material in a timely manner after adding water; add new material must first post within the existing concrete mixer can be discharged completely. Or when you can not be half-way down mixer full load start, reverse the material otherwise.(6) in the use of concrete mixer, do not allow sand to fall into the operation of the machine part, so as not to damage the moving parts jammed. After the bucket elevator, bucket through or staying at someone can not avoid brake failure accidents. Such as will repair or clean up at the bucket, forced down the hopper with the safety chain and braced.

Something About Decorative Concrete

Decorative Concrete is a highly adaptable decorative materials, can be integrated into people's re-creation of art, like a painting using the decorative concrete, getting people to arbitrary, creating a pattern of your heart, so that these buildings made of cement like art Like, from nature and above nature, reflecting the perfect combination of art and technology. It can give the architect and sculptor free imagination and create space for building design is no longer limited by the material, make architectural arts development to a higher level.
In addition to the appearance of structure, you can create a more beautiful than the general building materials, more engaging than buildings, decorative concrete also has the incomparable superiority of other building materials. Economic value, cost-effective. In the decorative concrete processing and production process, the lowest energy consumption per unit volume of material, the material itself both high strength and good durability and weather resistance, compared with natural stone products with low price and other natural resources and conservation advantages. Recycling economy, the requirements of sustainable development.
The environmental benefits, decorative concrete is a high-quality eco-friendly materials. Its raw materials are mostly directly from construction waste and industrial waste, it is the best kind of artificial materials in durability, and non-toxic, tasteless, high strength, water resistance and other characteristics, not only to achieve the waste recycling, but also meet High requirements of sustainable development strategies for the preservation and efficient use of natural resources raised.
The ornamental value, decorative concrete has an excellent decorative effect. Since the workability of concrete itself, using a special surface treatment technology, made bright or rough imitation of natural stone surface, in accordance with the design requirements made of imitation bamboo, wood and other effects, it can also be made of natural stone. But the color effect is more colorful than the natural stone.
With social progress and development, people living and working environments become increasingly demanding, demand for decorative finishes as concrete block and decorative concrete siding and plywood as the representatives of decorative concrete productscontinues to increase . As a new wall materials decorative concrete products industry, huge space for development.