JSLT7-L Wet Concrete Shotcrete Unit

JSLT7-L wet concrete spraying unit includes main engine: JSLT7-L wet concrete sprayer, screw feeder. The working principle of this equipment is different from that of rotor dry sprayer and pump wet sprayer. It is much better than the existing equipment in dust control, elasticity reduction, energy saving and efficiency improvement. The equipment was officially put into use in the market in April 2019. At present, it is the first wet grouting equipment with compact structure and convenient operation in China, and has won unanimous praise from the users.

Fig. 1 JSLT7-L wet concrete shotcrete unit

Fig. 2 Working principle diagram of JSLT7-L wet concrete shotcrete unit

Working Principle: Mixed material is injected into launching cylinder block 2 by hopper 1, material is pushed into mixing chamber 4 by sprocket driven sealed push plate 3, material is blown into elbow by incoming compressed air to realize three-phase flow injection.

JSLT7-L wet concrete sprayer consists of sprayer and feeding mixer. Its main technical parameters are as follows:

Table 1 Technical parameters of push chain concrete shotcrete

Compared with the traditional dry sprayer, JSLT7-L wet concrete sprayer has the following advantages:

(1) Effective improvement of working environment and long distance of transportation

JSLT7-L wet concrete shotcrete unit uses screw feeder to mix mixtures fully and add water quantitatively, so as to achieve full mixing and wetting of cement, sand and gravel, thus reducing dust production fundamentally. Dust concentration can be controlled below 20 mg/m3 in the operation site, while the visibility of traditional dry spraying site is extremely high. The average dust concentration is over 100 mg/m3.

JSLT7L wet concrete shotcrete unit overcomes the leakage phenomenon caused by poor sealing of traditional rotor shotcrete, adopts multi-pole sealing method to reduce the dust pollution around the machine, and realizes that it can transport more distances and avoid blockage at the same pressure. The horizontal transmission distance under 0.3MPa air pressure can reach more than 80m and 0.5MPa air pressure. The pressure can reach 150 m.

(2) The rebound rate is greatly reduced and the support strength is improved.

JSLT7-L wet concrete shotcrete unit has no pulse and feeding mixer makes concrete mix uniformly and control water-cement ratio accurately, which greatly reduces the rebound of sand and gravel during shotcreting process. The average rebound rate of concrete is controlled at about 10%(the rebound rate of traditional dry shotcrete is generally more than 25%). It saves materials and reduces construction cost. Ben.

Precise control of concrete uniformity and water cement ratio improves the strength of shotcrete. Compared with the traditional dry shotcrete technology, the strength of concrete in 28 days increases by at least 20%.

(3) Lower maintenance costs and less implicit investment in equipment

The original dry shotcrete machine has short service life and frequent replacement of parts. It needs to replace more than 4000 yuan of vulnerable parts per 300 square shotcrete on average. The invisible investment in the process of use is increased.

JSLT7-L wet concrete shotcrete unit adopts the structure of single contact between cylinder and piston. The only vulnerable part is piston seal, which is easy to replace. The cost of equipment maintenance is reduced by more than 50% compared with the previous one.

(4) Improve work efficiency and reduce labor intensity

The device is simple in structure and can be easily learned with or without professional knowledge, which is convenient for wide application. In terms of technological process, the equipment occupies less personnel in use without the use of pre-mixing materials in wells. The reason is that after the use of feeding mixer, there is no need for manual mixing of cement, sand and dry powder accelerator, and the pre-mixing process is cancelled, which saves at least 1-2 labor.

(5) Easy cleaning of equipment after use

The cleaning steps of the original dry sprayer after use are complex and easy to cause blockage in grouting. The connecting assembly part is the complicated disassembly of bolt structure. The machine adopts pin connection. The cleaning process is simple and fast, and only needs three steps to clean up (pulling out pin-cleaning-inserting pin).

In addition, there is less water added in the feeder, so the purpose of eliminating free dust is enough, so the pipeline need not be cleaned after the spraying operation.