Hangzhou Truemax Machinery & Equipment Co.,Ltd.

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Use fine aggregate concrete pump techniques

Now use the fine aggregate concrete pump more widely today on how to use fine aggregate concrete pump this problem, give us a presentation.

1, before the job needs to be conveyed to the concrete as to understand, should meet the concrete pump can pump requirements.

2, more than five minutes when the pumping stopped, the operator must be concrete end of the hose is discharged, it will easily lead to the end of the hose due to concrete dehydration, resulting in the next job pumping concrete issues to splash around, and this is also the end of the hose is easily damaged.

3, in order to ensure the boom pumping work in the best condition, should be: the one arm lifted to 45 degrees. The fabric is then swing the lever 180 degrees. Then two arms stretched 90 degrees. 3,4,5 section extending arm and was in horizontal position.

If the last boom can be in a horizontal position, it is ideal for pumping. If the position of this section of the boom is horizontal, then the flow will slow down the speed of the concrete, thereby reducing wear and the end of the hose pipes. When the pumping stopped, only the end of the concrete machinery will flow out of the hose.

5. Place the maximum level allowed by the machine inclination angle of 30 degrees, because the horizontal tilt angle over the General Assembly to make the fabric steering gear overload, and endangering the stability of the entire machine. If the boom in the mobile, one leg or several legs which had been off, this time the operator will have to re-set legs, and keep all of the legs can always supported on the ground.

6, after use, if necessary folding boom extend or retract, be sure to remind everyone that the anti-pump 1-2 times before the action, so to avoid when placing pipes, inside the concrete falling or splashing.

How to deal with the phenomenon of crack concrete equipment side panel?

Concrete equipment understanding of people know that in the course of concrete equipment, the phenomenon will appear side cracking can be considered one of the small irregularities, today we give manufacturers of professional and technical people tell you about the cause of this phenomenon causes and treatment methods, hoping to help you in the future when encountered the same situation can be quickly and correctly solve or avoid.
Causes of cracks:
1, fly ash (sand) too small, body can not keep up early strength
2, body density is too large
3, excessive body drop
4, the ratio of water, the lack of an elastic body
Solution:
1, (1) improve the cutting hardness (2) increase the sieve Fly
2, (1) Capacity control (2) the use of additives to improve the strength of the cutting body
3, body 10 cm cutting table saw must pause, then slowly falling
4, (1) reduce the specific gravity of the slurry (2) increase the amount of slurry (3) reducing the amount of lime
We mixed concrete batching plant manufacturers will be more to tell you about various irregularities and treatment methods appear in concrete production equipment, hoping people would like to know the content and timely attention to update our content on your site, help you solve the problem as soon as possible or to avoid misunderstanding. I hope you can help.

Tower Crane Safety General Provisions

Metal structure is the material basis for the main part of the tower crane, tower crane is elevated to withstand gravity and the main part. According to incomplete statistics, in 2013-2015 between all tower crane accidents reported, the overwhelming majority of the tower crane collapse, which is improper maintenance of metal structures are closely related. So do the metal structure tower crane maintenance crane production safety has an indispensable significance for extending the life of the tower crane, ensure.
First, the metal structure tower crane maintenance crane steel structure must be strictly enforced scrapped.
Secondly, the main structure of the force should always check the metal fatigue strength, weld cracks, structural deformation, damage, etc., the main force structure for processing.
hangzhou truemax crane rental company Recommendation: Check the work of structural members according to the following procedure.
(A) Daily inspection: tower crane at work every 80 hours should be a routine check. Tower crane driver should shift check all bolts connecting parts again
(B) When the tower crane abnormal sounds or misuse occurred, or discover the tower crane safety protection device malfunction, etc., should be checked.
(C) When a project is completed, after the demolition of tower crane, by engineering and technical personnel and professional maintenance personnel conduct a detailed examination, and make records.
In addition, in the transport process should try to try to prevent collision damage and structural deformation. It is worth mentioning that, Shandong crane tower crane rental companies recommend metal structural parts required every six months to a year stencilled paint - times. Before painting the metal surface should be divisible by oil, rust and other contaminants.

Historical development of concrete placing boom machine

Now the domestic production of concrete placing machine has two main manual and motorized.
In the mid-1980s boom came hand, his cloth radius of 10m, two-section folding jib can rotate 360 ​​°.
From 1989 to 1991, China's successful development of stand-alone type HG28 hydraulic fabric machine, the boom radius 28m, folding with a four wound type, manual, electric and cable remote control three operating modes, its technology basically reached the performance of similar foreign products in the early 1980s.
Development of 1992. HG30 type independent tower crane boom, boom mounted on the tower type TQ80 body, hydraulic drive, a large range of fabrics, suitable for large-span factories and power stations and other buildings of concrete pouring - in 1991.
The mid-1990s, China experienced in the climbing boom in the 17-28m range, according to transmission mode mechanical and hydraulic radius can be divided into two kinds of cloth and its. This mechanical installation in the center of the cylinder or the elevator shaft of the building, with the increase of the floor and climb. Because of this boom can not shift to some other remote areas need to adopt the way fabric.
In July 1996 the Ministry of Construction Beijing Construction Machinery Research Institute has developed a HGY10 type full hydraulic concrete spreader. The machine uses "Z" shaped folded sub-boom, cloth radius of 10m, weight 2.3 tons, the operation mode is a wired remote control. He has the advantage of compact, mobile and flexible, easy to operate, can be placed on a shelf or when used specifically for the erection of a simple platform, and on the same floor with a mobile crane to reach the required pouring from the surface, walls, columns , after use with a crane lifting machine laying down, without affecting other types of construction.
In summary, the current domestic concrete placing boom has made considerable progress, concrete pump productivity has reached 125 m3 / h, a vertical conveying distance up to 250m above the level of transmission distance over 2000m; domestic car boom concrete pump up to 60 m, pumping height of 200m or more, greatly expanded the scope of work; and 120 m3 / hour of mixing station and mixers and other domestic equipment accounted for a dominant position, the number of foreign imports of concrete machinery declining.

Tower crane foundation depth must be determined according to the geological conditions

Tower crane foundation depth must be determined according to the geological conditions. Because as a large crane construction machinery, as the crane foundation, not only the requirements of carrying capacity, as well as anti-overturning and stability requirements. It must be based on the geological conditions to determine its foundation embedment depth.Tower crane foundation for general use accompanying chart for specific construction standards, there is a minimum height requirement of the standard design content map, which should be the most basic requirements must be met.

As for how to determine the top elevation, can draw buildings ± 0.000 whirlwind arrival as the preferred reference. This makes it easy to set the crane supporting the installation of additional safety systems to ensure the safety of the crane.

Loading and unloading test methods shall meet the following requirements:
A load should be grading, using the same amount of load progressively; the maximum load rating load appropriate amount or estimated ultimate bearing capacity of 1/10, where the first stage desirable grading load twice.
2 grading should uninstall, uninstall the amount of time for each load level hierarchical load two times the same amount progressively unloaded.
3 plus, so that the load transfer should uninstall uniform, continuous, non-impact, each stage of loading in the maintenance process, the magnitude of change in level must not exceed 10% of the amount of increase or decrease.