A blasting method for bridge demolition

Abstract

The invention discloses a blasting method for demolition of bridges. The method comprises the following steps: (1), drilling; (2) filling with powder; For protection, add a layer of bamboo fence on the outside, lay a layer of bamboo fence on the bridge surface, and then press a layer of sandbags; (4), cover nearby equipment or buildings with sandbags; Hang bamboo fences or double-layer dense-mesh nets around for shelter and protection; (6), set three strip-shaped medicine bags on both sides of the bridge, connect the two ends with ropes and fix them to the two banks, and install the strip-shaped medicine bags every other section. Hang a stone to help sinking, and every other section is obliquely pulled with a rope fixed on the bridge to reduce the bending arc of the strip charge; (7), delay detonating the strip charge when the bridge is blasted; Effective control of flying rocks and dust.

Description

technical field

[0001] The invention relates to the technical field of bridge blasting, in particular to a blasting method for demolishing bridges. Background technique

[0002] With the rapid development of our country's economy, the traffic flow of roads has increased rapidly, and the requirements for the use and bearing capacity of existing road and bridge structures are also getting higher and higher. Many bridge structures have been overwhelmed by heavy traffic, and some have exceeded the design. Some bridges have become dangerous due to various reasons, and they are all facing the situation of reinforcement, reconstruction, demolition and reconstruction. Large-aperture charge blasting is generally used in large-scale earthwork blasting and blasting mining of various rocks and mines, and it is also used in large-scale foundation pit excavation. In the blasting demolition of structures, small-diameter drilling blasting is generally used for components, and large-diamete...

Examples

Embodiment 1

[0056] Such as Figure 4 , The parameters of the underwater strip charge can be set as follows: the burial depth is 20-40cm, the charge density of the charge line is 20-30g / m, and the length is equal to the length of the bridge in water.

[0057] Installation of strip-shaped medicine packs: 100m-long strip-shaped medicine packs are installed at 5-10m outside the two bridges, and the three strip-shaped medicine packs are bonded into one strand with wide tape, and the two ends are connected by ropes to the two banks. Fixed, the strip-shaped medicine bag is immersed in water at a depth of 20-30cm. Due to the fast flow of the river, the strip-shaped medicine bag is washed into an arc shape and is not easy to sink. For this reason, a stone is suspended every other section of the strip-shaped charge to help sinking, and every other section is obliquely pulled with a rope fixed on the bridge railing to reduce the bending arc of the strip-shaped charge. However, there is no fixed po...

technical field

[0001] The invention relates to the technical field of bridge blasting, in particular to a blasting method for demolishing bridges. Background technique

[0002] With the rapid development of our country's economy, the traffic flow of roads has increased rapidly, and the requirements for the use and bearing capacity of existing road and bridge structures are also getting higher and higher. Many bridge structures have been overwhelmed by heavy traffic, and some have exceeded the design. Some bridges have become dangerous due to various reasons, and they are all facing the situation of reinforcement, reconstruction, demolition and reconstruction. Large-aperture charge blasting is generally used in large-scale earthwork blasting and blasting mining of various rocks and mines, and it is also used in large-scale foundation pit excavation. In the blasting demolition of structures, small-diameter drilling blasting is generally used for components, and large-diamete...

Examples

Embodiment 1

[0056] Such as Figure 4 , The parameters of the underwater strip charge can be set as follows: the burial depth is 20-40cm, the charge density of the charge line is 20-30g / m, and the length is equal to the length of the bridge in water.

[0057] Installation of strip-shaped medicine packs: 100m-long strip-shaped medicine packs are installed at 5-10m outside the two bridges, and the three strip-shaped medicine packs are bonded into one strand with wide tape, and the two ends are connected by ropes to the two banks. Fixed, the strip-shaped medicine bag is immersed in water at a depth of 20-30cm. Due to the fast flow of the river, the strip-shaped medicine bag is washed into an arc shape and is not easy to sink. For this reason, a stone is suspended every other section of the strip-shaped charge to help sinking, and every other section is obliquely pulled with a rope fixed on the bridge railing to reduce the bending arc of the strip-shaped charge. However, there is no fixed po...

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