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.

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. 

Installation steps concrete batching plant

Commissioning of concrete batching plant apparatus after the completion of four main parts: preparation work before commissioning, unit testing, the whole no-load test, load test machine. Well, this four-part specifically how to operate it, Truemax for you to do something specific introduction:

1, before commissioning up job

Before commissioning, first check the following components:

(1) See all some convergence is not securely fastened, in particular in view of the stirring blade stirring the host adapter and the agitator shaft bolt is not tightened, the new machine should be fastened to view it again from scratch.

(2) See all smooth some conditions, to ensure that the smooth point lubricating oil (fat), each gear box and drum motor oil level within the scope of the request.

(3) Check the electrical cabinet and console each connector adapter bobble error-free connection.

After completion of the above view, enter during debugging.

2, unit commissioning

Since the electronic control system interlock between each setting some, unit commissioning is necessary in accordance with the following sequence: Mixes belt conveyor (Discharge Conveyor) → Mixer → raw aggregate belt conveyor (belt feeding machine) → Reap → feed belt scale speed screw conveyor powder screw feeder →  water supply system manifold system. Mechanical system debugging work together to investigate the motors operation direction. If the motor is rotating or turning rules are not the same, the phase inversion method adopted to Story.

3, the whole load test

Unit commissioning all normal, then no-load test, and after the first hand the initiative. In the following order of the boot-load test machine: Compressor → mixture was stirred host belt conveyor → → raw aggregate belt conveyor belt scale →  pellet powder spiral scale → Electronics → speed screw conveyor cement screw conveyor machine → water system.

4, the whole load test

Load test all normal, then load test, and after the first hand the initiative, the first unit test load after load test machine. Make sure the pool water. Cement silo Shanghao material. The best pellet feeding after the launch in the belt scale. Selected cooperation ratio, various formulations set enter the computer. First commissioning of water supply system, conditioning throttle, the pump output flow is slightly larger than the practice of usage. Then debug cement metering system to ensure that the cement screw conveyor achieve active status of start and stop. Final commissioning pellet metering system should pellet hopper Doumen opening rate in the mid-range. Speed ​​motor speed should be more than a job, the speed is too high, the degree of opening of the door to increase the feed speed is too low, the degree of opening the charging door is reduced. 

HOW TO USE CONCRETE PLACING BOOM

Fabric machine is not free to take a long, long time to be received, promised to work in more than the required radius plus set a fixed support.
Change position when the discharge port, with one sack will be exported wrap, avoid concrete fell on the ground, to another location on the material and then unlock.
Ready for concrete placement of signal lines and radio, dual control, in the columns, walls concrete pouring, to ensure that the lamp pump stop, stop Li Ting, foreground pouring point required in advance 4S stopped, put out the lights, communication is necessary based hand carried out at night during the construction, coupled with the necessary control of concrete people flashlight, to see concrete pouring height.
Test, with a large rope control concrete spout, and the lever arm intermediate curved split at its large scope week run.
Take concrete pump tube, when taken over, it is necessary to check whether the full clean the pump tube, the interface is necessary to use a rubber gasket. After concrete pump pipe connector bolts should re-examine the case.
Wind cable rope with cloth lever legs fixed, cable wind rope too tight, should stay out of boom force and deformation interval.
Can not stand when the feed rod placed on the body to use when compacting frame tube legs, mounted on the ground floor.
Mounted boom and counterweight boom intermediate requirements necessary to discharge hit 200 ~ 300mm, the foot support surface or wooden sleepers bedding, check whether the shaft vertical fabric machine.
Erection frame body concrete placing boom placement, and the inspection and acceptance, to calculate the force parts of the frame body capacity, reinforcing the case of stable situation Twill member of the foundation.
Check whether the bolts of cloth machine all tightening, whether normal hinge.
The fabric machine stand straight, see if you can stand straight in the case do not counterweight. (Boom normal circumstances are considered to be in the counterweight can not stand straight, as when lifting boom, common crane boom can not be hung up together with the counterweight, need to be lifted in two installation).
Hydraulic System cloth machine Full description:
(1) climb hydraulic jacking system and the host system share a pumping station, the connection between the two systems using imported high-quality quick connectors, independent, free conversion conditions (cloth / lifting), safe, reliable, and effective system conditions to solve the oil spill problem switching process, to avoid polluting the environment.
(2) The machine adopts the open hydraulic system, the system is simple, reliable, easy to fault diagnosis and troubleshooting.
(3) As used boom balancing valve for the Italian Truemax imported products with secondary overflow characteristics, can effectively ensure the smooth operation of the boom, to avoid influence by external cylinder pressure suddenly increased in the case of damage to the boom, enhanced use safety.
(4) rotating all-hydraulic drive, low speed high torque hydraulic motor planetary reducer, can be used for 480 ° rotation, smooth rotary motion and accurate. For fabric machine characteristics are often in high-altitude operations, the normally-open swing brake, to ensure that fabric machine in the non-working condition, free skating can turn the wind, not because the wind load is too large and damage the drive mechanism and structure. 

Concrete pump truck function analysis

Concrete pump truck, also known by the pressure along the pipeline will be concrete continuous conveyor machinery. By the pump and delivery tube. Form of the structure is divided into piston, squeeze, pressure diaphragm. Pump mounted on the vehicle chassis, and then equip scalable or tortuous boom, on the composition of truck.
Concrete pump is adapted from the truck chassis, which is mounted on the chassis movement and power transmission devices, pumping and mixing device, feeding device and some other auxiliary devices.
Concrete pump power through a power transfer case transfers power from the engine to the hydraulic pump groups or rear axle, hydraulic push the piston driven concrete pump. Then use the boom and pump delivery pipe on the concrete delivery to a certain height and distance.
Concrete pump truck with the engine in addition to drive, but also to drive the pumping mechanism, mixing mechanism and fabrics institutions working device.
Concrete pump power of the working device from car engines.
When concrete pump working, car engine power transmitted through the transmission transfer case, and then after the transfer case switch passed to the hydraulic pumps or chassis bridge.
When the driver is switched to pumping position to issue instructions, pneumatic solenoid valve control box on the transfer cylinder push fork, fork and then push switch to pumping gear isolated position, and cut off power after the bridge to make cars in parking status. Conversely, switch to the driving position.

Reason pumping concrete slump and slump loss 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 mixing station 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 mixer 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, make sure to test the adaptability of cement and concrete admixtures.

(2) The adjustment of concrete mix, 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 machinery. 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!