Thermal expansion rock breaking pipe and hard rock stratum foundation pit combined rock breaking method

Abstract

The invention discloses a thermal expansion rock breaking pipe and hard rock stratum foundation pit combined rock breaking method. The thermal expansion rock breaking pipe comprises an outer pipe, expansion agent blocking structures, plugs and an ignition head wire. An inner cavity of the outer pipe is filled with a thermal expansion agent, and an electric ignition head is pre-buried in the thermal expansion agent; the expansion agent blocking structures are arranged at the two ends of the inner cavity of the outer pipe, and the expanding agent blocking structures block the thermal expansion agent in the inner cavity of the outer pipe; the plugs are arranged at the two ends of the outer pipe to plug the inner cavity of the outer pipe; and the ignition head wire is connected with the electric ignition head and is led out from a gap between the outer pipe and a plug. The combined rock breaking method is a thermal expansion agent presplitting rock breaking-breaking hammer method synergistic rock breaking method. The thermal expansion rock breaking pipe is simple in structure, convenient to operate, low in cost and capable of being used in the construction environment with water seepage and moisture. According to the combined rock breaking method, the rock breaking efficiency can be improved, the rock breaking cost can be reduced, the rock breaking safety coefficient can be improved, rock breaking disturbance is small, noise is low, the operation process is simple, hole plugging and charging time is short, and vibration damage to surrounding rock masses or adjacent buildings is almost avoided.

Description

technical field [0001] The invention relates to the technical field of foundation pit engineering, in particular to a heat-expandable rock-breaking pipe and a combined rock-breaking method for rapid excavation of foundation pits in urban hard rock formations using the heat-expandable rock-breaking pipe. Background technique [0002] With the rapid development of my country's economy and the intensive development and utilization of land, the density of urban underground space projects and existing structural area engineering buildings is increasing, and it is becoming more and more difficult to build new projects close to existing structures or buildings, such as urban Foundation pit excavation projects such as subways, civil air defense projects, and high-rise buildings. [0003] For the excavation of this type of foundation pit, if the traditional drilling and blasting method is used for construction, there will be a series of problems such as large blasting vibration, loud ...

AI Technical Summary

Problems solved by technology

In the non-blasting process, mechanical excavation is more commonly used, such as mechanical milling method, splitting rod assisted excavation method, breaking hammer rock breaking method, etc. These methods have great disadvantages in terms of rock breaking efficiency and cost control

[0005] In addition, some scholars use high-pressure gas to break rocks, such as liquid CO 2 Phase change rock-breaking technology, but due to the complex structure of the fracturing tube, high manufacturing and processing costs, high requirements for storage and transportation of liquid carbon dioxide, and the rock-breaking effect on hard rocks is not good, this method is mostly used in relatively loose rocks. In the blasting excavation of medium-hard rock with developed coal seams and joints and fissures

In addition, in the construction environment with water seepage and humidity, the existing high-pressure gas rock breaking method will fail due to the gas-generating agent soaking in water

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