A kind of wet sprayed concrete and its production method

Abstract

The invention relates to wet spraying concrete and a production method thereof and belongs to concrete used for an underground tunnel and a slope anchoring and shotcreting support and a production method thereof. The following raw materials are adopted in parts by weight: 410-430 parts of silicate cement, 650-690 parts of rice stone, 900-1100 parts of artificial sand, 35-45 parts of nano material and the balance of silicon powder and steel fiber, and the raw materials are prepared into different kinds of wet spraying concrete according to the formula and material mixing. The wet spraying concrete provided by the invention has the beneficial effects that the wet spraying concrete can be bonded with a surrounding rock, bonding strength is high, once spraying thickness of concrete is increased, strength is quickly increased, and toughness and anti-seismic and anti-explosion properties of the concrete are improved.

Description

Technical field: [0001] The invention relates to wet shotcrete and a production method thereof, which belong to the concrete used in the bolt-shotcrete support of underground tunnels and slopes, and the production method thereof. Background technique: [0002] In hydropower stations, underground tunnels, and slope bolting and shotcreting support projects, there are often major engineering geological problems such as superlong diversion tunnels, huge cavern sections, harsh geological conditions, underground water inrush, high ground stress rockbursts, and fault fracture zones. In particular, due to the large buried depth of the water diversion tunnel, rockbursts often occur near the face of the tunnel. The conventional spraying of ordinary concrete has the problems of low bond strength between the concrete and the surrounding rock, the thickness of the primary spraying layer is relatively thin, and the strength increases slowly. At the same time, due to the needs of the cons...

AI Technical Summary

Problems solved by technology

The existing technology uses ordinary concrete spraying, but the problem is that the bonding strength between the concrete and the surrounding rock is not high, the thickness of the primary spraying layer is relatively thin, and the strength growth is slow

At the same time, due to the needs of the construction schedule, the blasting of the face of the tunnel was carried out 12 to 16 hours after the previous cycle of spraying concrete, and the concrete was often shaken and collapsed.

For the water-rich areas encountered during excavation, it is difficult to spray ordinary wet sprayed concrete, the bonding with the surrounding rock cannot be guaranteed, and the spraying thickness is also very unsatisfactory, and the phenomenon of falling immediately after spraying often occurs

For the above special geological conditions, the use of ordinary shotcrete has been difficult to meet the requirements of construction progress and safety.

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