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Blasting method for foundation pit excavation

A technology for foundation pits and slopes, applied in the field of blasting, which can solve problems such as inability to achieve stable discharge of explosives, adjust explosives, and a large amount of dust, achieve long-term storage of materials, prevent mutual adhesion, and improve work efficiency.

Active Publication Date: 2021-05-28
北京理工北阳爆破工程技术有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Blasting is the rapid release of explosive energy in a short period of time, destroying the surrounding rock-soil medium, and at the same time inevitably causing a large initial velocity to the surrounding individual rocks. The control of the harmful effects of blasting is more stringent, and even the use of blasting operations is not approved. For conventional ultra-deep foundation pit blasting, the harmful effects of blasting mainly include blasting vibration, blasting shock waves, blasting noise, blasting dust, harmful gases, and flying blasts generated by blasting. Stone, conventional safety protection measures are blocking, evasion and safety alert. Nowadays, there are no mature blasting protection safety requirements and corresponding blasting protection methods, and low-efficiency, high-cost non-blasting technologies are often used to avoid high-risk operations or risky operations. Aftermath methods for repairing damage
[0003] However, when blasting the foundation pit, the method of interval charging is adopted. Although the blasting stress can be evenly distributed in the entire borehole, a large amount of dust is likely to be generated during the blasting, and manual charging is generally used when the charge is released. method, since manual charging cannot adjust the position of explosives according to different situations, it cannot achieve stable discharge

Method used

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  • Blasting method for foundation pit excavation
  • Blasting method for foundation pit excavation
  • Blasting method for foundation pit excavation

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Experimental program
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Effect test

Embodiment 1

[0046] A method for excavating and blasting a foundation pit, comprising the following steps:

[0047] S1: Terrain Survey: Familiar with engineering geology and geological survey data, understand site terrain, landform, etc. Before construction, design blasthole parameters and stipulate slopes reasonably according to site terrain, cross-sectional shape of blasting area, and frozen soil distribution;

[0048] S2: Slope excavation: When excavating a side slope, a 0.4 thick protective layer is reserved during blasting excavation, and a water intercepting ditch is dug at the top of the slope along the extension direction of the slope to prevent rainwater from flowing to the side slope. The roof is sealed with cement to prevent rainwater from invading the slope, thus ensuring the quality of the slope;

[0049] S3: Slope protection: Detect whether there is a dissolved cavity in the slope structure, and excavate accordingly to form slopes located on the left and right sides of the ro...

Embodiment 2

[0076] S1: Terrain Survey: Familiar with engineering geology and geological survey data, understand site terrain, landform, etc. Before construction, design blasthole parameters and stipulate slopes reasonably according to site terrain, cross-sectional shape of blasting area, and frozen soil distribution;

[0077] S2: Slope excavation: When excavating a side slope, a 0.6m thick protective layer is reserved during blasting excavation, and a water intercepting ditch is dug at the top of the slope along the extension direction of the slope to prevent rainwater from flowing to the side slope. The top of the slope is sealed with cement to prevent rainwater from invading the slope, thereby ensuring the quality of the slope;

[0078] S3: Slope protection: Detect whether there is a dissolved cavity in the slope structure, and excavate accordingly to form slopes located on the left and right sides of the road section crossing the dissolved cavity, and use the bolt-net-spraying combined ...

Embodiment 3

[0086] S1: Terrain Survey: Familiar with engineering geology and geological survey data, understand site terrain, landform, etc. Before construction, design blasthole parameters and stipulate slopes reasonably according to site terrain, cross-sectional shape of blasting area, and frozen soil distribution;

[0087] S2: Slope excavation: When excavating a side slope, reserve a 0.7m thick protective layer during blasting excavation, and dig a water intercepting ditch along the extension direction of the slope at the top of the slope to prevent rainwater from flowing to the side slope. The top of the slope is sealed with cement to prevent rainwater from invading the slope, thereby ensuring the quality of the slope;

[0088] S3: Slope protection: Detect whether there is a dissolved cavity in the slope structure, and excavate accordingly to form slopes located on the left and right sides of the road section crossing the dissolved cavity, and use the bolt-net-spraying combined support...

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Abstract

The invention discloses a blasting method for foundation pit excavation. The blasting method comprises the following steps of surveying a terrain, excavating a side slope, protecting the side slope, establishing a safety protection enclosure, drilling, charging, blocking, performing stepped blasting and removing ballast. The blasting method for foundation pit excavation is more scientific and reasonable, through the use of a mature slope protection technology and a rock stratum excavation construction technology, the establishment of a safe enclosure, strict drilling operation, a charging technology, standard operation of blasting, and the use of detection means with strict measures, the risk coefficient in the construction process can be effectively reduced, the blasting safety is greatly improved, and meanwhile, the influence of blasting on the surrounding environment can be effectively reduced, and the blasting method is high in blasting efficiency, low in cost and worthy of popularization.

Description

technical field [0001] The invention belongs to the technical field of blasting, and in particular relates to a blasting method for foundation pit excavation. Background technique [0002] Blasting is the rapid release of explosive energy in a short period of time, destroying the surrounding rock-soil medium, and at the same time inevitably causing a large initial velocity to the surrounding individual rocks. The control of the harmful effects of blasting is more stringent, and even the use of blasting operations is not approved. For conventional ultra-deep foundation pit blasting, the harmful effects of blasting mainly include blasting vibration, blasting shock waves, blasting noise, blasting dust, harmful gases, and flying blasts generated by blasting. Stone, conventional safety protection measures are blocking, evasion and safety alert. Nowadays, there are no mature blasting protection safety requirements and corresponding blasting protection methods, and low-efficiency, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F42D1/00F42D1/08F42D1/18F42D5/04F42D5/00
CPCF42D1/00F42D1/08F42D1/18F42D5/04F42D5/00
Inventor 沈佳龙
Owner 北京理工北阳爆破工程技术有限责任公司
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