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.

Proper use of concrete mixers

Concrete mixer is correct and its operational safety are closely linked, the hangzhou truemax Machinery Co., Ltd. in this for the proper use of concrete mixers elaborated a system, namely:
 
1) In order to ensure the mix mixing quality must be gravel, sand and cement required weighing accuracy; and before the stirring, adjusted as required on good signs tank pointer position to control the amount of water. Good mixing time should be strictly controlled, and requested the hopper discharge clean, otherwise it will affect the next mix mixture.
 
2) To feed in the hopper loading, attention should be charging order, that the next gravel, cement, and sand in, so when the hopper is raised without causing cement dust.
 
3) After work is completed, it should be stirred pour some gravel or sand inside the drum, stirring 10min and then released. Otherwise the inside of the drum remnants solidified, it is difficult to remove.

How to use concrete placing boom

Concrete placing boom can not be arbitrarily long, shall be connected to a long time, in the greater than promised to work in a fixed position must be equipped with a fixed support.


When the discharge port is changed, the outlet is covered with a sack, and the concrete is prevented from falling on the ground. 
Ready concrete pouring of the signal lines and intercom, double control, columns, walls of concrete pouring in, to ensure that the lamp pump stop, stop stopped, the front concrete must advance 4S halted, lights, communication must be established a special, night construction control of concrete with flashlight required, see concrete pouring height. 
Test with rope control of concrete material outlet, and the middle arm bending demolition, run for a week in the large scope. 
Concrete pump in to take over, must check full pump tube are cleaned, the interface required by rubber gasket. Connect the concrete pump pipe shall check the bolt. 
With the cable wind rope concrete placing boom rod fixed legs, cable wind rope not too tight, the interval should be set aside concrete placing boom rod deformation. 
When the material rod is arranged on the frame, the supporting legs are compacted, and the utility model can not be used when the ground is installed on the floor. 
Placed placing boom and counterweight,concrete placing boom of the intermediate lever must arrange 200~300mm, supporting feet beneath sleeper or wood, cloth inspection machine shaft is vertical. 
The frame body which is placed in the position of the concrete placing boom rod is put in the frame, and the checking and acceptance are carried out to calculate the bearing capacity of the bearing part, the reinforcement of the double fastener and the stable condition of the foundation. 
Check whether all the bolts of concrete placing boom tightly, the rotating shaft is normal. 
The concrete placing boom is straight, whether in the case of straight do not weight. (general concrete placing boom rod into in don't weight can stand straight, due to the lifting cloth rod, common crane can not be cloth bar and counterweight hanging together, need points twice to hoisting and installation). 
The hydraulic system of distributing machine is introduced in the paper: 
(1) climbing inside the top lift hydraulic system and the main system share a pumping station, adopts imported high quality quick connector to connect between the two systems, independent of each other, optional conversion conditions (concrete placing boom / lifting), safe and reliable and effectively solve in the process of mode switching system leakage problem, and avoid the pollution to the environment. 
(2) the machine adopts open hydraulic system, the system is simple and reliable, easy to fault diagnosis and elimination. 
(3) arm for balance valve for quadratic overflow with Italian Oilcontrol imported products, can effectively ensure the boom running smoothly, avoid cylinder under external influence and pressure suddenly increased damage to boom, and enhance the safety in using. 
(4) rotary hydraulic drive, low speed and high torque hydraulic motor drive planetary gear reducer, can be used for 480 degree rotation, swing action is stable and accurate. For fabrics machine often in work high above the ground, rotary brake selects normally open, can guarantee machine concrete placing boom in the non operating state, wind free slip, not because of the wind load is too large and the destruction of the transmission mechanism and structure. 

How to build a Concrete Batch Plant

How to build concrete batch plant and the establishment of methods are those? Provided by the well-known authority on concrete mixer concrete batch plant manufacturer of professional technical department, you need to know to help the majority of concrete batch plant knowledge and skills of personnel specially collated literature.
First, concrete batch plant host and feed batching system should be based on the duration of the project, the total concrete, daily dosage of concrete indicators to be configured to meet the maximum daily dosage is appropriate concrete; a blender and associated feed batching system for a production line ; general engineering can be set only one production line, a large and important project should be set up two production lines, arranged in parallel, in order to ensure uninterrupted supply of concrete for the project; a project can be set up only a concrete batch plant, each partition can also be set up concrete batch plant, or centralized setup of a large concrete batch plant which together with the right amount of concrete trucks; specific to the actual situation.
Secondly, sand, stone yard area should be large enough to meet the required engineering consumption and organizations can easily feed supplement; gravel pile partition, causing the concrete to prevent mixing graded allowed; equipped with loaders and feed sand and gravel were neatly stacked; venue to be hardened, easy loader loading and to prevent dirt and other debris into the material.
Once again, a concrete batch plant with a 1-2 pool shall be required to ensure concrete mixing and mechanical cleaning. A production line at least compatible with two cement silo, preferably three, take turns using replenish, to meet the needs of concrete without cement production backlog. Large volume and pumping concrete and fly ash generally required admixtures, according to the site were placed to facilitate the use of appropriate
Finally, as for delivery of finished concrete way, you can choose the way of concrete pump. The way to be able to meet the delivery transport distance and height and concrete supply basis, usually arranged in front of the mixer, pump tube connected to the pouring ground; also be arranged in the near pouring place, with concrete trucks to the pump.
There are a few points above the layout, and the remaining concrete concrete mixing station components can be assembled according to production needs established. 

Concrete Pump catch the bottom or compaction causes and solutions appear to send poor

1, causes

(1) does not comply with the ratio selection process of pumping concrete pumpworkability requirements.

(2) the amount of cement is low.

(3) sand and stone gradation unreasonable, porosity.

(4) is too small compared with the rate in the sand, the slump is too large,concrete machinery and easy segregation.

(5) serious bleeding prone to catch the bottom of the concrete or compacted (stick pan).

(6) a large amount of cement concrete is easy to catch the end of the phenomenon.

(7) concrete admixtures content easy to catch the end of a large concrete phenomenon.

(8) the sand is small, concrete prone to compaction phenomenon.

(9) high concrete water-reducing admixture, bleeding rate, water retention, thickening, air-entraining effect of poor concrete easy to catch the bottom or compaction phenomenon.

2, Solutions

(1) reduction of unit water consumption.

(2) increase the rate of sand.

(3) adding an appropriate amount of admixtures such as fly ash, to reduce the amount of cement.

(4) reducing concrete admixture content.

(5) increase in concrete admixtures entraining, thickening, water retention function.

What are the advantages of concrete boom pump?

Concrete boom pump is also commonly referred to as the pump, it has its own independent arm, able to walk independently, and therefore welcomed by the majority of the construction side. So concrete boom pump and other concrete pumps of exactly what advantages it? To address this issue we visited the experts.

Experts pointed out: concrete boom pump due to the easy to use and also very convenient, so the construction side to use more. And compared to other concrete pump, concrete boom pump these advantages unattainable. Specifically, the advantages of concrete boom pump performance in the following aspects:

1, without reprovision pipeline

In general, concrete boom pump can be attached self pipeline, no need to reprovision the pipeline, after opening to the workplace, will soon be able to open the boom to work, usually within half an hour you can be ready, short preparation time.

2, flexible and efficient

Concrete boom pump is equipped with a hydraulic roll-fold boom can rotate within the flexible scope of work, the fabric is very convenient, and fast pumping speed, typically 90m3 / h -150m3 / h, very high efficiency.

3, easy to operate

Concrete boom pump automation is very high, generally the entire pump from the pump to the cloth by one person can operate with a wireless remote control system, easy to operate.

4, rapid maneuver

Concrete boom pump motor performance is very good, usually after a project is completed job can be quickly transferred to another project to continue operations, while responsible for pumping concrete, high equipment utilization several projects.