Construction of building hoist

Building hoist using the lift is a basket (cage) vertically along the guide rail frame (or tilt) mechanical motion used to transport personnel and materials.

The structure is a elevator cage carrying ladders and counterweight, wire rope hanging in the column at the top of the fixed pulley, columns and architectural structures rigid coupling. Ladder cage with electric drive gear, with a reaction force on the fixed rack uprights, ladder cage guide rails for vertical movement along the column. Its columns made into a standard section length of the upper and lower sections can be interchanged according to the required height to the construction site for assembly, generally erected up lOOm, for up to 200m at high-rise building construction. Elevator can be installed by means of itself electric boom assembly at the top of the construction site can also use the crane and other lifting equipment assembly. In addition, as the ladder cage and counterweight are arranged symmetrically, so overturning moment is small, the column passed mural firmly connected with the building structure, so reasonable and reliable force.

Should pay attention to what matters to clean concrete mixer

With the development in recent years, new rural construction, urban renewal and other aspects of development, roads, bridges, housing and other construction is booming, concrete as the most important construction materials, concrete mixers various construction sites ideal mixing equipment. With respect to the bridge, crane, the mixer is relatively maintenance is relatively easy, but can not be underestimated, perhaps a small detail will directly affect concrete mixers, such as: concrete mixer cleaning.

Concrete mixer should be cleaned to note the following:

First, regular maintenance procedures specified projects, maintenance operations, such as cleaning, lubricating, refueling

Second, the concrete mixer before starting first check the controller is good, and stones into the water after the suspension was stirred cylinder 10 to 15 minutes cleaning, then clean out the water and stone. The operator shall enter such as stirring barrel cleaning, in addition to cut off the power and remove the fuse outside, and shall lock switch box.

Third, prohibit the use of a sledgehammer beat way to clear accumulated in the concrete mixer concrete barrel, it can only be removed with a chisel.

Fourth, in the cold season, after the work is completed and the application of water to wash the mixer drum pumps, water tanks, water discharge pipes inside the net, so water pumps, water tanks, water pipes freezing.

How to make work more efficient concrete batching plant?

Concrete batching plant, whether on the scale or in the price are very huge, great attention must be used in the process, to understand some of the considerations, we can make more concrete batching plant efficiency, longer life. That in the course of it need to pay attention to what matters?

First, the amount of work to meet the concrete batching plant model performance. For example, concrete batching plant workload try not to exceed its load, do not because of momentary greed to concrete batching plant extra work, such equipment would like people exhausted. Of course, have to be in the concrete batching plant control working hours, long working hours, the device tends to produce a lot of heat, high temperature equipment device would produce damage.
Secondly, the operator must have this rigorous training. Before the operator must undergo a rigorous induction training, structure and performance of the equipment have a full understanding of the methods of operation have a more accurate perception, in operation less errors appear, this will not give what damage equipment. And after the operator will be more rigorous training to know how to care and maintenance of concrete batching plant.

Domestic new fully enclosed concrete mixer truck successfully developed

Recently, Qingdao Heavy construction vehicle unit in cooperation with a research company has developed innovative products - all closed concrete mixer truck off the assembly line in Qingdao Heavy Industries, and delivered to the user.

It is understood, fully enclosed concrete mixer truck concrete in improving the quality of transport, traffic safety, environmental conservation,promotion and other aspects of capacity, compared with the traditional mixer has a qualitative leap. Closed on the basis of ordinary concrete mixer truck concrete mixer truck based on the installation closed device, effectively solves the moisture present in traditional mixer evaporate during transport, mortar layered, high center of gravity, sprinkling leakage of material and other issues. Fully enclosed concrete mixer truck sealed technology, small angle placement of the tank, which greatly reduce evaporation, prevent external moisture from entering, stir, to prevent delamination; concrete sample uniform, in full compliance with the relevant provisions of concreting, from the basis ensure construction quality.

Hammer crusher comparative advantage of other crusher

In the crushing plant, the type of crusher varied, all have different strengths, also have different disadvantages, for crushed material is different, material hardness, humidity, viscosity and components are directly related to the equipment production efficiency, which hammer crusher can effectively deal with a large amount of material moisture, prevent clogging of equipment, to meet the different needs of users.

Hammer crusher can not only provide the best quality of aggregate for the highway, railway, high-rise buildings, municipal engineering, construction of hydroelectric dams, ports, concrete mixing station, so that the river pebbles applications more widely, not only Housing construction in the concrete aggregate and road construction is the horizontal stabilizer layer material.

In the cement industry, sand and gravel into the field on the occasion, the future of hammer crusher and gravel production line is the cement industry user can first consider the manufacturers, its green low-carbon performance of production equipment put forward higher requirements, the future production of highly efficient machinery Unique hammer crusher design, adaptability and other advantages of a place in the mineral processing equipment, crushing equipment is preferred. After numerous times their research and improvement, produced sand production line equipment widely used in river gravel sand, tailings sand, sand and other construction waste areas to different production to meet customer needs.

PROCESSING METHOD OF CONCRETE BOOM PUMP FOUND HIDDEN

Concrete pump truck is currently a very common kind of concrete delivery tool that can greatly enhance delivery efficiency of concrete. But in the transportation of concrete once found hidden how to handle it? Specifically, we now take a look.
Experts pointed out: At present, the application of concrete boom pump construction unit has been welcome to the construction machinery, it can greatly improve the transportation efficiency of concrete. Then in the construction of the concrete pump truck found hidden in how to handle it? Specifically, the following two points:

1 In operation
During construction of the pumping equipment and piping were observed, if found hidden should be addressed promptly, tubes may exceed the prescribed wear, clamps, seals and other timely replacement, but should prevent pipe blockage. It should be pumping concrete in their stir while controlling good slump. During pumping, the pump must not stop halfway, at any time to monitor a variety of instruments and indicators, found to be normal should be timely adjusted or treatment. When duct blockage, should anti-pump operation, the concrete hopper return; when the anti-pump several times still can not eliminate clogging can unload at the pump, the split tube blockage excluded.
2, After operation
Concrete inside the hopper and the pipeline should be all the output, and then pumps, hoppers, pipelines into line flushing. When flushing pipes with compressed air, the intake valve should immediately open a large, smooth discharge only when the concrete before the intake valve open to the maximum. At the outlet end of the pipe is strictly prohibited to stand in front of 10 meters, and the application and other metal basket to collect balls and cleaning out sand grains. Solidification of the concrete should be used a scraper to remove. After the job should go to the wash chamber on both sides of the piston position, and greased. Each part of the operation switch, adjust the handles, hand wheels, levers, cocks, etc. should be reset, then uninstall the hydraulic system. 

The concrete cause bleeding, segregation problems and Solutions

1. Causes
​
(1) easy to secrete large cement fineness water, cement C3A content is low and easy bleeding, cement standard consistency small amount of water, and easy bleeding.

(2)the amount of cement is small, easy bleeding.

(3) low-grade cement ratio of high-grade cement concrete and easy bleeding (with content).

(4) the same level of concrete, concrete high-grade cement than low-grade cement concrete more bleeding.

(5) units of water is too large concrete easily bleeding, segregation.

(6) Concrete mixture temperature is too high, especially in summer, the temperature is high, quick hydration, large slump loss.

(7) the intensity of low-grade concrete prone to bleeding.

(8) The rate of small concrete sand and easy bleeding, segregation phenomenon.

(9) continuous particle size smaller water than the single particle size gravel gravel concrete bleeding.

(10) concrete admixture water retention, thickening, poor air-entraining concrete prone to bleeding.

(11) excess concrete mixer concrete admixtures prone to bleeding, segregation.

(12) Some models of the mixer truck was stirred poor performance by some distance transport, when the initial discharge concrete mixtures obvious coarse aggregate floating phenomenon.

(13) concrete mixer truck mix leave water barrel, not drained before loading or during transport, any water to mix barrel.

2. Solutions

(1) the fundamental way is to reduce the unit water consumption.

(2) increasing the rate of sand, choose a reasonable rate of sand.

(3) hot summer, to take measures to reduce the temperature of the concrete mixture.

(4) increasing the amount of cement or mixed with the right amount of Ⅰ, Ⅱ grade fly ash.

(5) continuous grading of gravel and small flakiness content.

(6) to improve the performance of concrete admixtures, it has better water retention, thickening, or the amount of reducing concrete admixture content (live only), mixing station if the lower dosage of concrete admixtures, may be out of concrete and concrete Slump loss fast new problems.

(7) concrete mixer truck in front of the discharge, should be in high-speed rotating mixing drum, the concrete mixture evenly discharge.

(8) to strengthen the management of the truck after cleaning the mixing tube shall discharge before charging after draining them. After loading, non-random to mix with water barrel.

3. Lessons Learned

Bleeding, segregation problem prone against concrete. By learning experimented summed up a set with the actual situation to solve problems. Such as optimizing mix, strengthen the approach detection of raw materials, enhance on-site management. Prevent mixing station due to poor site management and increased water consumption random phenomenon.

Reason pumping concrete slump loss, slump instability problems and solutions

1. Causes

(1) concrete admixtures caused by poor compatibility with cement concrete slump loss fast

(2) The content is not enough concrete admixtures, retarding, plastic - not ideal.

(3) the hot weather, some admixture fail at high temperatures; fast evaporation; bubble caused by spills of fresh concrete slump loss quickly.

(4) initial slump of concrete is too small, too little water units.

(5) and concrete batching plant construction site coordination bad, so that the pressure tank car, traffic jam time is too long, leading to concrete slump loss is too great.

(6) concrete mixing weighing system measurement error, instability.

(7) coarse and fine aggregate moisture content changes.

(8) mixed cement storage warehouse, mixed-use.

2. Solutions

(1) The adjustment of concrete admixture formulations adapted it with cement. Before construction machinery, make sure to test the adaptability of cement and concrete admixtures.

(2) The adjustment of concrete mixer, increase or decrease the rate of sand, water, concrete adjustment to the initial slump more than 200mm.

(3) adding an appropriate amount of fly ash, instead of part of the cement.

(4) The amount of content to increase concrete admixtures, retarding admixtures adjustment component (especially when temperatures much higher temperatures than usual).

(5) to prevent excessive evaporation, bubble spills too.

(6) use of slag cement or pozzolan cement.

(7) to improve water retention, cooling device concrete truck.

Accuracy (8) metering equipment should meet the relevant requirements, and have a valid certificate issued by the legal metrology department, to strengthen the self-test to ensure accurate measurement.

(9) To strengthen aggregate moisture content testing, when changes, timely adjust the mix.

(10) into the library should cement manufacturers, varieties and labels are stored separately and use.

3. Lessons Learned

Especially for pumping concrete pumping concrete and underwater pile foundation of concrete slump loss problems. By learning experimented summed up a set with the actual situation to solve problems. Additive manufacturers such as communication to improve and adjust admixture retarding ingredients; adjust concrete construction time, avoid high temperatures not under construction; use in road construction roads far away poor situation of secondary feed additives; the use of large Volume Fly Ash Concrete Mix construction. Concrete slump loss of this thorny issue, to give greater ease. No matter what the cause of the slump caused by the smaller unable to pump or can not meet the construction requirements of the situation we can use admixture slump adjusted so as to achieve the desired slump, add water to prevent arbitrary increases Collapse off of bad habits to determine the quality of the concrete from the fundamental.

Concrete Placing boom Equipment

1. Concrete pump truck boom
Concrete pump truck boom is stretching on both concrete pump can also be attached to the twists and turns of concrete placing boom equipment. Concrete pipeline is located in the boom, the end is a piece of hose for cloth during concrete pouring work. A wide range of fabrics such devices, in general, do not need to line pipe.

2. Concrete independent distributor
Freestanding concrete distributor is an independent fabric equipment and concrete pumpsupporting work. Within the operating radius, can be more flexible and comfortable to pouring concrete. Its working radius is generally around 10m, the largest up to 40m. Due to its relatively lightweight, flexible floor moves in the construction, so the actual casting a wider scope for floor concrete placing boom high-rise buildings.
3. Stationary placing booms
Fixed boom known as the tower boom, can be divided into two types: Attached booms and inner climbing boom. In addition to these two fabrics Boom boom, other components such as a turntable, rotating support, Rotary, operating platforms, ladders, adopt appropriate crane undercarriage parts production, which received high jacking system, floor climbing system also from the corresponding attachment style white rose climbing tower crane and tower crane inside. Attached boom boom and internal climbing tower has two different structures, one is a tubular column tower, the other is a square lattice truss structure section architecture. Boom fabrics they use low-alloy high strength steel welding of thin-walled box section structure, generally consists of three components. Thin-walled tube is attached to a pumping box section beam, between two sections Tubing communicates with 90 ° elbow. This fabric boom stoop, Yang, music, extending noted manipulated by a hydraulic system. In order to reduce the role of cloth arm bending load on the tower, boom arm more balanced and fitted with a counterweight.
 At present, some within the climbing boom as HGl7 ~ HG25 type, fitted with another cloth Boom, Boom is lightweight steel lattice truss structure, consists of two sections composed of tubing attached thereto on the boom, using the sheave change web system luffing jib folded and pitch. Maximum working range of this fabric arm is 17 ~ 28m, the minimum operating margin of 1 ~ 2m.
Fixed boom fitted with tubing in three sizes: ∮100mm, ∮112mm, ∮125mm, pipe wall thickness is generally 6mm. The end of the boom tube end on the fabric tubing also are 4m long sleeved rubber hose to facilitate cloth.
4. Lifting fabric dual-purpose machine
The aircraft, also known as dual-use crane lifting cloth, mostly heavy-duty crane based restructuring, mainly used for modeling complex, concrete pouring large project. Feeding System can be attached to a special set of shelves to climb, it can also be installed at the top of the tower hardened modified turntable. The so-called special climbing frame but a special cantilevered bearing turntable with ordinary aggregate with climbing frame. Feeding system and at the top of the tower a special turntable mounted thereto.
5. Concrete pouring bucket
(1) cloth bucket of concrete pouring concrete level with a transport tool vertical transport. Concrete pouring infighting put by crane hanging fabric directly to the placement location. Pouring bucket with steel plate welded into a dustpan type, capacity is generally 1m3. Both sides welded earrings, easy hook lifting. The upper opening, the lower part of the door, door exit to 40cm × 40cm, with automatic gates to open and close.
(2) Concrete bucket conical, elevated square, two-way discharge shaped, bucket capacity 0.7 ~ 1.4m3. After the concrete directly into the mixer, use a crane to hoist pouring locations.

Common failure analysis concrete truck mixer Tops

The car also has a life history of each car important new to old, from newborn to phase out, in the process, also like humans, various kinds of “illness”, then in the case of concrete truck mixers upload process to “illness”, we how to remedy it? Here are some common failure analysis coat, hoping to help the majority of riders and friends.
For faults, we must first pay attention to understand the nature of the fault appears: a sudden or gradual? Is a new car or fails to appear for a period of time? How long age of the vehicle? Are there laws fault? Overloading and empty car Symptom whether to change? High speed and whether there are differences in low speed fault phenomenon? For failure analysis of these factors have important reference value.

1, tanks shake: concrete truck mixer tank in the production process by machining to ensure that the center of gravity on the axis of the tank, so the tank during normal operation is stable, however, because the product material or material uneven operation It will lead to shift the focus of the tank, then the tank transport line will appear over the center of gravity of the upper and lower jitter at both points. Jitter performance since the product material failure caused by: 1, shake the tank operated with cyclical changes, 2, tanks shake no more than twice a week operation. Such a failure can be obtained by marking to identify the body. Of course,Does not rule out the processing tank causes tank eccentric, most OEMs have stringent requirements for the processing tank, tank eccentric possibility is very small, in addition, all the concrete mixer at the factory will be debugged, tanks eccentric mixer will not default, so for users, the possibility of the eccentric body is extremely low.
If the jitter is not the law, it is necessary to observe whether the muddy oil tank, running any abnormal noise, consider the possibility of air entrainment. Of course, do not forget to check the oil deceleration, gear exclude the possibility of damage, when mixed into chunks inside damaged gear reducer oil solution metal particles.
2, the noise: firstly, the hydraulic system itself will sound when the output power, particularly in the high-power output, so if there are empty regularity noise power output, the tank should be excluded from the possibility of serious product material. Noise is divided into two types: a dull roar, sharp
Clamor sounds. For the former, the air mixed with the reasons should be considered, whether the system is short of oil? Replacing the hydraulic oil filter and the last is when? System piping oil leaks? Clear whether oil tank? Clamor for sharp sounds, but also at high pressure overflow noise and mechanical causes noise, when overloaded, if the load is too large and exceeds the set value of the system relief valve, the system will overflow, then will produce a sharp clamor sounds, accompanied by the rapid increase in oil. Mechanical causes of noise often as the engine speed is increased to produce.
3, heavy weakness: weakness for overloading faults, we must first understand the age of the vehicle, and the reference vehicle maintenance conditions, in particular, should open the filter inspection, if found metal powder, copper and even chunks of metal foam, that is, within the filter It may conclude pump or motor wear.