It turns out there is a way to blast without using explosives!

CO2 rock blasting system

Carbon dioxide gas can be converted into liquid under a certain high pressure. The liquid carbon dioxide is compressed into a cylindrical container (blasting tube) by a high-pressure pump, and the safety film, rupture disc, heat-conducting rod and sealing ring are loaded. The alloy cap is tightened to complete the preparations before blasting. Bring the blasting tube, detonator and power cord to the blasting site, insert the blasting tube into the drill hole and fix it, and connect the detonator power supply.

When the microcurrent passes through the high thermal conductivity rod, high temperature is generated to break through the safety film, instantly gasify the liquid carbon dioxide, and the rapid expansion produces a high-pressure shock wave, causing the pressure relief valve to open automatically. The liquid carbon dioxide absorbs heat and gasifies, and the volume expands rapidly to produce high pressure, causing the rock to crack.

Advantages

1. Gas is safer than explosives, does not belong to civil explosive products, and does not require approval for transportation, storage and use.

2. No cumbersome procedures for explosive approval and strict supervision by the public security department are required.

3. There is no destructive vibration and short wave during the blasting process, the proportion of dust is reduced, and the impact on the surrounding environment is not great.

4. It can be used in complex working environments, such as coal mines and mining fields.

5. Carbon dioxide gas is easy to purchase, and some devices can be reused.

6. Multiple blasting tubes can be connected in parallel at the same time, with great blasting power and large rock individuals after blasting.

Disadvantages

1. Low efficiency: The steps are too complicated, and there are only a few blasts a day. The more links there are, the more likely there will be problems. Such as filling, wiring, sealing and other links.

2. Requirements for the air surface: Only when the air surface is used can it be effective. It is not suitable for deep foundation pits or working surfaces with poor volleying.

3. Low output: It is impossible to achieve multi-row blasting, resulting in the number of blasting tubes for a single blasting should not exceed two rows. If it exceeds one row, it is easy to get stuck or blow up the blasting tube.

4. High cost: The activator used is a special, disposable item, and the blasting cost is high when the output is not high. 5. High requirements: The blasting tube filling process and on-site construction are relatively complicated, and the quality requirements for the blasthole are high.

6. Noise and safety: Although the vibration force of blasting is not great, the sound is obvious after all. If you want to use it in the vicinity of residential buildings and structures, you should try to consult the local safety supervision and environmental protection department to see if it is allowed.

Expansion agent

The mechanism of blasting by expansion agent is different from that of explosives. It mainly relies on the slow chemical reaction and physical change of the expansion agent in the crushed body to deform the grains, increase the temperature, and expand the volume, so as to gradually increase the static expansion pressure on the hole wall, causing the medium to crack and disintegrate.

Scope of application

1. Concrete projects and rock loosening projects that need to be demolished under conditions where explosive blasting and mechanical crushing construction are not allowed or not suitable.

2. Demolition of urban buildings, concrete foundations of large equipment, water conservancy, roads and bridges, tunnels and other projects that require "static blasting method" crushing construction. Retain part of the rock and concrete integrity and structural strength requirements cannot be damaged by any crushing and demolition.

3. Crushing and loosening of ordinary rocks, excavation of large-sized shafts, anti-slip piles, piles, and trench caissons.

4. Precious rock waste mining and stone cutting.

5. Suitable for under-excavation and slope treatment projects requiring simultaneous excavation and support.

Features 1. Large expansion force: the maximum can reach 122 MPa (1220kg/c㎡).

2. Short reaction time: the shortest time for the maximum expansion force to appear can be within 2 hours. The reaction time can also be adjusted between 2 hours and 10 hours.

3. Easy shape control and convenient cutting: It is easy to control the shape of the crushed body after crushing, and it can be broken if it needs to be broken or retained if it needs to be retained.

4. Simple construction and easy operation: no detonator explosives, no blasting, and no professional work are required. The operator training time is very short.

5. Environmental protection: no sound, no vibration, no flying stones, no toxic gas, and no shock waves during use.

Disadvantages The expansion agent has a long construction period, low construction output, high requirements for the site's open surface, is greatly affected by rain and temperature, and is affected by factors such as spraying and alkaline hazards.