The related problems of shotcrete machine

Does the contractor have the experience and adequately qualifield nozzlemen and finisher to perform quality work? Does the contractor have the right equipment available?The answers to all these questions will help in the selection of the most appropriate materials, mixture design(s), supply, and application methods.

The most important factor in the selection of dry&wet-mix shotcrete. Although shotcrete started initially as a dry-mix process in the early 1900s, the development of efficient small-line concrete pumps for wet-mix shotcrete has enhanced the production placement rates of shotcrete, and so the tendency today is to increasingly use wet-mix 

Shotcrete on the majority of projects. The introduction of the shotcrete-placing boom has greatly improved production on large-volume applications and has doubled or tripled production on many mining and tunneling projects. The dry-mix shotcrete process, however, is still a well-known and proven procedure that is readily available and can be used economically for specific applications where logistics and accessibility are major concerns.

Shotcrete(gunite)materials with different proportion

Shotcrete process is to use compressed air to convey the pre-dampened mix through delivery hose to the nozzle to project the material onto the sprayed surface under high velocity, and then to form concrete support layer after the projected material coagulates and hardens. At the shotcrete nozzle, air is added. The air from the shotcrete nozzle provides several functions, including to propel the mix at a higher velocity and to spread the mix out into a cone-shaped spray pattern. Since the shotcrete is being propelled at a high velocity, compaction occurs as the shotcrete particles accumulate on the application surface. Increasing the air can mean higher shotcrete velocity and better compaction, which leads to denser concrete that exhibits greater compressive strength and less permeability. 

With shotcrete the W/C ratio is controlled at the batch plant or at the mixing station. The concrete needs to be plastic enough to pump. Since low W/C ratios produce a more durable and water-resistant mix, water-reducing agents are often used. In general, a W/C ratio under 0.5 produces a more durable and waterproof mix. Since the concrete is pumped wet, the process is also known as Wet-Mix and Wet.

Shotcrete/Gunite –Both Shotcrete and Gunite open up new methods of concrete construction. Sprayed concrete lets you go vertical with concrete without all the formwork needed for poured in place concrete.

One distinct advantage of either the shotcrete or gunite system over hand-application is the water/cement (W/C) ratio of the in-place concrete. A benefit of shotcrete and gunite(gunite machine)is that the in-place W/C ratio is usually less than a mix that was not pneumatically applied. One of the reasons for this is that more water is evaporated during the spraying process than is evaporated with the trowel process.

Spraying machine and wet spraying concrete “shotcrete technology”

Shotcrete machine shotcrete process is generally dry spray, tidal spray, wet spray. The main difference is that the feeding program for each process, in particular, add water and the timing of the accelerating agent. Here we find out more about the spraying machine dry spray boom spray, wet spray injection process.

Dry-mix shotcrete machine: spray dry aggregate, cement and accelerating agent by a certain percentage of dry mixed evenly, and then load the jet, so that the dry aggregate in suspension within the hose to pressure sent to the gun with compressed air, the nozzle at high-pressure water mixed at a higher speed jet to the rock surface. Dry-mix shotcrete the mechanical structure is relatively simple, mechanical cleaning and troubleshooting easy. But its drawback is prone to large dust, resilience large amount, add water is controlled by the nozzle valve, the water-cement ratio control more difficult and associated with the operator's proficiency.

Sprayed shotcrete requires better different service

Our sprayed shotcrete tools are used to spray plaster,shotcrete,earthen mixes and more.

mortar sprayers make traditional plastering and many alternative building methods faster and easier than with a hawk and trowel.

We design extreme durability into our tools. For example, our hoppers are made from either stainless steel or cast aluminum and we guarantee them forever as long as you don’t turn it into a lump of concrete or bang it on a rock . The jets are made from solid brass, and if you clean them correctly they will never wear out.We have over several decades of experience in the shotcrete industry. 

Over the past 30 years Shotcrete Services has become renowned for their expertise in sprayed concrete design and construction. Through the decades Shotcrete Services（sprayed shotcrete service）has led the development of the various sprayed concrete processes.

Browse the pages of our website to gain an insight to the services and products that we provide. 

Grouting pump has a wide use range because of the good effect
Some users feel that grouting has a wide use range,which is for a reason. That is high performance of grouting pump, and unlike other commodities can only convey the slurry to the mouth of a gap, as to fill effect depending on the gap can on the extent of absorption for slurry. But it seems very dedicated for grouting pump, the slurry is fed directly to each gap, the cracks unobstructed are blocked extremely .
Our mortar pump is a single-cylinder pump, having a small size, light weight, small power need and large shotcrete volume.
This is a piston mortar pump, slurry is inhaled through the choke piston, and hatted out through a slurry mouth, there is a continuous operation of a pulse mortar pump.Mortar pump is a single-cylinder piston pump in function, being able to transport cement slurry, yellow mud slurry, water glass, oil, water and other much media. With the advantages of a compact structure, reliable work, low failure rate, cleaning and maintenance convenience and higher pumping pressure.

Good hydroseeder gives you comfort life

Hydro seeding spraying is applied through pressure via a hose onto the desired soil area, creating an ideal environment for seed germination and turf development. Once the hydroseeder is spraying it will appear as a green mat, aiding water and soil retention. This mat acts as a green house, nourishing and speeding up the germination process. As your lawn grows, this mat disappears and nurtures the soil.

Hydroseederon Lawn provides premium quality grass, however the success and development of this grass is water dependent.RYP Series Hydroseeder spray on Lawn, we are committed to using premium products. We offer the highest quality grass which is applied in an effective and timely manner, gaining exceptional results.

Seeding spraying is a great way to grow grass. The seed, fertilizer, tackifier and water are all applied in one fast easy step. The use of messy straw is eliminated. Trimming is quick and easy. Problems with difficult to seed areas such as hill sides, and narrow areas between the sidewalk and the curb are a breeze. Hydro Seeding System. Labor costs are reduced. One man can easy run most the systems.

How to do your lawn in garden

If you are planning to re-do your lawn completely it is necessary to completely remove the existing turf before hydro seeding (hydroseeder)the new lawn. The best way to do this is to skin off the existing turf. If you are doing a small area a shovel or spade can be used. The best way to do a larger area is to rent a sod cutter. It is best do do this when the soil is dry. Moist soil is heavier and harder to handle. If you have a garden you can compost the old sod that you have removed and turn it into rich humus to build your garden.     

Don't use a rotary tiller to clear a sodded area. Rotary tillers cause weed problems by chopping up plants and weed roots and spreading them through the lawn. You could end up with more weeds in your new lawn than you had in your old one.  

You can also have the old lawn sprayed with a herbicide to kill all existing vegetation, then level an loosen the soil and have the lawn hydro seeded. You should wait about 3 weeks from the time the herbicide is applied before seeding.

 

the operation tips of belt conveyor

Belt runs to one side for a considerable distance, or the entire conveyor.

1.The belt is running off center as it comes around the tail pulley and/or through the load point.

Re-track belt, install training idlers on the return prior to the tail pulley.

2. Build up the material of the idler rollers. Clean and maintain. Install scrapers, brushes, and other 

cleaning devices.

3 loading center or the belt of improper loading . Make sure load chute places and the 

center of the belt. Make sure the down direction of the chute material

4 The pulleys and or the idlers are out of square with the belt center line. Adjust pulleys and 

or idlers.

5.Idler stands are not focused to the belt. Adjust the stands for proper alignment.

6.The conveyor frame is not square or the system is not properly supported. 

The origin of concrete spraying machine(gunite machine), also known as SSB machines, dates back to the early 1960’s. As the technology of sprayed concrete became more widespread, these machines gradually found applications in the construction as well as the metallurgic industry.But the development of grouting pump is still boosting in every aspects.Now we summary some common problems in grouting process below: 

The preparatory work underground grouting

1.Grouting worker need to understand the purpose of grout work, grouting workload ,and the piping system (including diameter, Fittings, Valves model and installation location, etc.), complete with pipe wrench, wrenches, taps, pliers, wire and other tools and materials.

2.Grouting work to reach the workplace, first check the top grouting locations, to help support the case, if appearing insecurity, it is to be dealt immediately. Then checking grouting equipment(grouting pump,or piston grouting pump)and piping system status, identify problems and timely treatment.

3.Before grouting, first flush pipe (or drilling), to giving suppress the test, push the volume of water, drilling and pipeline 3-5 times the volume of the product. Check the grouting hole is smooth or not, clogging or not, to facilitating grouting.

4.The ending of the pressurized water, if pressure water conditions to meet the requirements, you can choose the right slurry to help grouting by the amount of water absorbed per unit.Grouting process to observe whether the orifice and ran around the pulp, with or without strings plasma phenomena.

5.According to the grouting conditions at any time adjust the slurry grouting ratio and duration. If drilling is continuous boost, continuous grouting shall, until it reaches the end of the standard.

6.Grouting device drivers should always pay attention to the functioning and found that equipment malfunction (such as pressure increases suddenly, violently beating grouting pipe,etc.), to immediately shut down, check processing.

The problems and solutions in belt conveyor use 

(1)Belt slips when conveyor is started.

1. Insufficient traction between belt and drive pulley. Make sure drive pulley is free of build up.

Lag Drive pulley. Increase belt wrap on drive pulley. Increase belt tension.

2. Inadequate belt tension is possible, recalculate tension requirements. If necessary increase 

weight on gravity take up or increase tension at screw take-up.

3. Pulley lagging is worn or not adequate to produce sufficient traction. Replace with new or 

correct pulley lagging.

4. Counter weight hitting bottom, not enough belt tension. Shorten belt and re-splice

5. One or more of the system pulleys are below the acceptable diameter. Replace pulleys with 

diameters acceptable to belt requirements.

(2)Belt runs off at the head pulley.

1. Material build-up on the pulley face or conveyor structure. Clean system, improve material 

containment, install cleaners, check skirting, install belt scrapers at head pulley.

2. The pulleys and or the idlers are out of square with the belt centreline. Readjust pulleys and 

or idlers.

3. Pulley lagging is worn or not adequate to produce sufficient traction. Replace with new or 

correct pulley lagging.

4. Idler stands are not centred to the belt. Readjust the stands for proper alignment

Zhengzhou Ruoya is a Chinese company specialized in the design, production and sale of Shotcrete Machine, Spraying machine, Grouting Pump, welcome new and old customers visit us and buy our spraying machine.

Squeeze grouting machine with suction, and the ability to work without lubrication, no valve, no seal, squeeze pumped conveying material is not be contaminated, the system automatically clean up, less wearing parts, and easy maintenance.