Pouring concrete placing booms requirements

Boom concrete pump and process with the use of some of the requirements to ensure that concrete pouring scope thickness.
 
In the concrete pouring requirements are: 1. concrete bucket mouth from falling freely pour down height shall not exceed 2m, measures to be taken if more than 2 m. Should string tube, a catheter, or chute opened the door in the side of the hole template (green port). 2. pouring concrete segments should be stratified, each pouring height should be determined according to the structural characteristics and density steel case. Vibrators generally stratification height is 1.25 times the length of the active portion, the maximum does not exceed 500 mm; thickness of the layered plate vibrator is 200 mm. 3. start vibrators, vibrators hand holding the upper end of the shaft vibrator hose, quickly insert inside the concrete when vibrated, vibrating rod twitch up and down slightly, vibration time is 20 to 30 seconds, but no longer to the concrete surface bubbles, no significant subsidence, surface pan paste and surface level prevail. Use vibrators should be done slowly push pull, plug points should be uniform arrangement, point by point move in sequence, to be omitted, so that even the tap. Mobile spaced not more than 1.5 times the radius of action of the vibrator (typically 300 ~ 400 mm), the template close distance of not less than 200 mm. On vibrated concrete surface layer should be inserted into the lower 50 ~ 100 mm, in order to eliminate the seam between the two layers. Moving pitch plate vibrator should be able to guarantee cover plate vibrator tap has been part of the edge. 4. The pouring of concrete should be carried out continuously. If it is necessary intermittent, intermittent time it should be as short as possible and shall before the initial setting of the first layer of concrete, the sub-layer concrete pouring is completed. The maximum time interval should be all varieties of cement and concrete to determine the initial setting conditions, generally more than two hours should be construction joint. 5. send someone should be pouring steel template frequently observed, reserved holes, embedded parts, dowels, etc. Have displacement deformation or blockage, identify problems and should be trimmed and watered immediately before completion of the initial setting of concrete has been poured. 6. When finished pouring, check whether reinforced concrete surface contamination, and promptly cleaned. Just after the above requirements will be able to ensure the quality of operations boom pouring concrete.

Concrete Placing Boom installation and maintenance

Concrete Placing Boom Boom length based primarily on points, 12M-45M, mainly from cloth role, mainly used in the construction machinery of large bridges, concrete pump output from fabric to Placing Boom concrete conveying it to the work surface
 
BLG15,12 Kalahari feed rod using rotary arm rack fabric structure, fabric range of up to 690 square meters, equipped with 125MM pipes, 360 degree rotation, the machine manually. Has a simple structure, strength, rigidity, reliable, simple, flexible, easy maintenance, and supporting the use of concrete pumps can be widely used in civil and industrial construction concreting works
When the wind speed exceeds 13.8m / s (6 wind), non-placing boom work. When the wind speed exceeds 7.78m / s (four winds), non-Placing Boom  assembly and disassembly, within climb jacking.

2 placing boom should maintain a certain distance from the high-voltage lines and electrical appliances.

3 ends pouring hose must fasten safety rope, prohibit the use of the end of the hose lengths over 3 m pouring hose shall be inserted poured concrete in strict accordance Placing Boom  range.

4 Placing Boom at work beneath the boom allowed to stand.

5 hydraulic system pressure must not exceed 25Mpa.

6 Do not open the pipe joints in the duct and the pressure within the tubing.

7 Do the ends of the hose removed, so that the boom and the other rigid delivery pipeline connection.

8 rotation during braking or do the reverse operation is prohibited when the equipment machinery is not completely stopped. Swivel connector ferrule can not be fixed at too tight, ensuring flexible rotation per shift to be cleaned lubricated rotary joint pipe clamp seal once.

9 repair or maintenance, you should cut off the ground supply, repair and maintenance are not allowed to live.

10 work at the end of the boom must be close together, hang hook, the arm horizontally, cut off the power supply ground

Concrete mixer truck safety rules

Cement plant components:
A concrete mixer truck automobiles car part should implement the provisions of the general safety technical requirements. Second, concrete mixing vehicles transporting fuel, lubricating oil, hydraulic oil, brake fluid, cooling water should be added sufficient quality should meet the requirements.

Third, the power output apparatus should be checked and confirmed that no loose bolts and bearing oil spills and other phenomena. Fourth, the stirring transport, loading of the concrete should not exceed the rated capacity. Fifth, before starting mixer, mixing tube should be operating handle on the "stop" position
Sixth, before mixing trucks loading, mixing tube should be first inverted so that water and debris barrel drained. Seven, when the charge should be a joystick on the "charge" position, and adjust the speed of the mixing tube, the feed smoothly.
Eight concrete during transport, make sure slide hopper placed firmly to prevent loosening caused by swing, injuring pedestrians or affect the normal operation of other vehicles in the road.
Nine, shipped Mixed Concrete, mixing tube speed of 2-10 rev / min, during transport, stirring drum speed on a flat road surface guarantees 2-3 rev / min, with slopes greater than 50 in the roll of the road, or from side to side a large road, the rotation should stop stirring until the road improved after the recovery swirled.
Ten, Time tanker transport concrete concrete batching plant can not exceed the specified time. Transporting concrete
The way, the mixing tube can not be stopped for a long time, to prevent the concrete to produce segregation phenomenon. Drivers should always observe the concrete situation, abnormal timely informed the control room, to make the application process.
XI, being transformed into the mixing tube by a reverse rotation should be first joystick in the middle position, to be stopped after the mixing tube and then put the handle lever to reverse position.
XII before discharge concrete mixing drum should be rotated at 10-12 rev / min speed for 1 minute, then nesting.
XIII, stirring means continuous operation time should not exceed 8h.
Fourth, the work is completed, the mixing tube should be cleaned inside and body, so that the remaining concrete can not stay in the barrel.
Fifth, the water level in the tank should be maintained properly. In winter parking, water tanks and water systems should be put in the net.

"In the high-altitude work": tower crane operations master Yangzhou life

At each site, there are a group of people sitting in class finished the day on a day of their high-altitude operations, and has been transported to repeat monotonous work, they are porters on the site - tower crane operations master.
Zhang to the country this year, 31 years old, engaged in crane operation has been six years, currently working at a construction machinery in the West End. 5:30 every day, Zhang country began a day of work. Because hot summer days, the afternoon working hours from 3:00 start work on the afternoon about five hours.
Site workers and the general different, Zhang country's workplace has been in the air, so every day before work, Zhang States to conduct some climbing trip. According to the country, said Zhang, now he has to overcome the psychological barriers, climbing more than 40 meters of scaffolding is easy.
Sit between the tower crane operation, it started the day's work. Workers Crane finished tied beneath the material, Yiguo Zhang start tower crane, which was transported to the destination, and then tied up the workers and then unlock the removed material will need to be shipped, it announced the completion of a transport, and Zhang to the country needs to do is , repeated delivery. "10 hours are so definitely feel more boring," Zhang told the author to the country, at work, and peer through the intercom to talk, he became the only way to relax.
Seemingly simple task, but it is not so simple. Tower crane operations are special industry, every teacher is required to hold the tower operations operating permit, and obtain operating permits before, you also need to participate in a high-temperature operation of high-altitude tests. "There are a lot of test items, fear of heights, ah, ah heart and lung function, and even blood sugar should be measured." Yiguo Zhang said.
For security reasons, six Cupola machine this site on equipped with nine tower crane operations master, the relevant person in charge told the author, this is mainly to prevent the workers because of fatigue work accident, so Zhang country each work two days rest day. As a native of Yangzhou in his spare time, in addition to spend time with his family outside, with the field workers will eat dinner together, take them to see the beauty of Yangzhou.
Compared to six years of Zhang to the country, just one year of Wu industry a bit shy, yesterday afternoon, girlfriend Wu industry also came to the site to see him, "to see them in such a high place of work, in fact, was also very worried, so empty, it will come to see him. "girlfriend Wu industry told reporters.

Floor openings from climbing concrete placing boom

Boom used, perpendicular to the ground to be built on each floor of the opening required to build a building of the same size, and boom will be fixed therein. Imposed load boom, boom when the building has been built to a certain height and floor plate having sufficient strength to withstand being allowed to climb along the opening. It can reach a height depends on the speed of construction of buildings, which usually climb a whole floor height (should be 3.5 meters) each time. When theconcrete placing boom or climbing, their workload from the floor around the opening, but mainly in vertical loads climbing frame emission.

Since the boom is ready to crawl along the floor were open. The steps are as follows:
Boom (1) manual valve mountaineering be treated to achieve. The operator stands on the floor openings are specially constructed fabric machine climb and climbing frames are positioned for the next, next extended or retracted to control climbing cylinder.
(2) selector switch on the console & NBSP; "self-climbing" position to start the motor, and then to extend the operation of the manual valve cylinder upwards so semi-circular hole in the upper part of the cylinder piston head hit the top of the shaft in the tower. Kept extending until the lower portion of the lower frame of the top shaft loosened cylinder, then remove it.
Above the cylinder manual valve (3) when the shank extends 500mm, allow engagement hole in the lower frame to the tower, and then insert the lower part of the top shaft.In this case, hydraulic cylinders and retract boom will fall from the top of the low shaft support it. Remove the top of the upper shaft, and insert it in another hole in the tower.
(4) extend cylinder manual valve handle, so half hole in the piston head hit the upper part of the shaft at the top of the tower. Kept extending until the lower portion of the lower frame of the top shaft loosened cylinder, then remove it to start the second mountaineering trip & NBSP; & NBSP; repeating the above operation, the boom will rise up along the climbing frame.
The ground climb boom cylinder cycles required depends on the height of the ground. For example, a 3-meter-high floor needs 5 cycles.
(5) After completing the climb, tightly iron wedge wedge means climbing frame. Vertical forces from the boom is in the lower part of the tower to the top of the shaft to pass the lower frame, and the horizontal force is composed of two up and down climbing frames.
The selector switch in the boom are transferred to the control station before pouring the concrete "work" position.
Finally, disconnect the hose from the pipe fitting cylinder climb the tower on the platform plate, and place it on the platform and the tower portion of the platform for use on another portion of which in the future.

Note the small concrete pump truck construction work

During the construction work in a small concrete pump, particular attention must be carried out in strict accordance with the construction requirements to ensure construction quality. Then the actual construction work we need to pay attention to what areas? Heavy Visa today to introduce you to the following:
1, the use of plug-in concrete vibrator plate vibrator pouring peace. After pouring machine must be vibrated dense, vibration time 15 to 30 seconds to start the pan concrete slurry and non-fizzy prevail. Before the initial setting of concrete, in the casting junction and columns, walls, shaft wall and the bottom surface of the bottom portion of the secondary transfer of the vibration plate vibrator, improve the crack resistance of concrete. After the concrete vibration, surface treated before the initial setting of concrete. Bricklayer class organization after concrete pouring, close the water before the initial setting time, compaction polished wooden mold to close the water closed cracks.
2, according to design requirements to ensure that the basement reinforced protective layer thickness, and definitely not a negative error.
3, after the final setting of concrete should be carried out immediately watering conservation, conservation of time not less than 7 days. During the curing concrete floor keeping the surface layer of protective film of water. Chaimo specimens and structural floor with curing condition.
4, if the use of concrete commercial concrete mixing station. Commercial concrete have plans, timing, location, quantitative to the site.
5, concrete slump detection field measured once per vehicle hand, strict quality control of concrete. Concrete slump error range 2cm, not use substandard concrete, test results should be timely feedback deviation concrete mixing station, timely correction. On-site production of concrete layers 150 * 150 specimens, each class at least one group, a group of not less than every 100m3. Various parts of the floor above but also required an indwelling same curing condition of concrete specimens.
6, strengthen the protection bearing steel construction machinery is prohibited stampede. Let someone bearing steel for amendments. The steel pads with paving, especially bearing foot position reinforcement.

How to clean small stone concrete pump?

Fine aggregate concrete pump plays a very important role in the construction work in warm, warm it can greatly improve the efficiency of construction. However, the use of fine aggregate concrete pumps in the process, pay attention to cleaning fine aggregate concrete pump is very important. Exactly how to clean fine aggregate concrete pump it? Specifically, we now take a look at.

Experts pointed out: fine aggregate concrete pump pipe during construction, to pump tube cleaning, which is an important step after pumping essential. Good cleaning method generally either cleaned pipes, and the pipe can be transported to the pouring of concrete all locations, so that not only save the amount of concrete, but also a considerable economic environment. Specifically, the step of cleaning the fine aggregate concrete pump has the following steps.

1, check the cutting ring and glasses, plates

Check the cutting ring and wear plate between the eyes, which is the key to the success of the direct kick cleaning method. If the cutting ring and the wear and tear is not serious eye plate, cutting ring and eye plate spacing <0.1 mm, and no more than one millimeter between them grooves scratch, you can use a direct kick method for cleaning.

2, short pipe cleaning method

Under normal circumstances, can be After pumping concrete pumping 0.15 ~ 0.25m \ +3 cement ratio of 1.5 or 1:2 mortar, then fill the water in the dispensing valve to start pumping, the concrete pumping pouring into place until the end of the delivery tube output until the water flows out. If the pipe is shorter, the cleaning effect is better, then the cleaning process ends.

3, long pipe cleaning method

If the pipe is longer or cleaning effect is not very good, you can open the hopper discharge doors and anti-pump, hopper and dispensing valve rinse. If pumping height up and> 20 m, you can choose with a wooden hammer percussion section at the bottom of the vertical pipe, if the percussion sound is very low, you need to bend apart, poured can accumulate large aggregates.