Thermal rock breaking disposal method for boulder in shield construction
A disposal method and technology in construction, applied in the direction of earth cube drilling, mining equipment, tunnels, etc., can solve problems such as low construction efficiency, complex construction technology, soil disturbance, etc., to save construction process costs, avoid soil disturbance, Improve the effect of construction progress
Pending Publication Date: 2019-08-09
CHONGQING UNIV
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Problems solved by technology
The main problem of blasting treatment is that the distance between the blasting point and the shield machine is relatively close during the blasting process, and the amount of explosives needs to be strictly controlled, and the blasting will disturb the soil layer. For the construction of urban underground tunnels, the noise caused by blasting will also affect the surrounding area. Production and life of residents
In the form of multi-drilling, there are problems such as low efficiency, high energy consumption, and high cost.
Based on this, the new disposal method of boulders in shield construction should solve the problems of traditional methods such as large disturbance to the soil layer, great impact on residents, complicated construction technology, low construction efficiency, unsafe and uneconomical
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[0043] The volume of the boulder to be processed is 2 cubic meters, and the cross-section of the working area is as follows figure 2 shown. The specific construction process is as follows:
[0044] Step 1: Use the high-frequency electromagnetic waves emitted by the geological radar to find out the distribution of the boulders in the formation of the site, so as to determine the drilling position.
[0045] Step 2: Drill holes on the boulder that hinders the shield construction process. The drilling tool uses a flexible hinged guide power drilling tool to drill in a straight line in the soil layer. hole, the drilling direction can be changed. Holes are drilled throughout the intact rock, adjusting the number of holes per boulder according to the boulder volume.
[0046] Step 3: After drilling through the entire target rock, lift the drill pipe, inject clean water into the drill pipe, use the drill bit to discharge the drilling slag, and complete hole cleaning so that the fra...
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The invention discloses a thermal rock breaking disposal method for a boulder in shield construction. The thermal rock breaking disposal method comprises the steps that a distribution location of theboulder is determined by using a geological radar; a flexible guiding drill is adopted to drill on the boulder contained in a soil layer; after a hole is formed, a thermal cracking agent is sent intothe hole through a soft rubber rod; the thermal cracking agent is catalyzed for reaction by high-temperature electric resistance wires; the thermal cracking agent generates a thermal cracking net in the boulder to deteriorate the rock strength, and the cracking strength of the rock mass is evaluated by the ultrasonic testing technology; and after the process, a shield machine is continuously advanced for excavation and support in the formation in which the strength of the rock mass is deteriorated. The construction process of the thermal rock breaking disposal method can accurately perform guiding drilling in the boulder in the soil layer, perform small radius turning under complicated formation conditions, and can accurately and efficiently break the boulder which affects shield construction, the novel thermal cracking agent can create cracks in the boulder by creating local high heat and expansion, and the ultrasonic testing technology can efficiently analyze the rock integrity; andcompared with existing methods for cracking the boulder, the thermal rock breaking disposal method has lower energy consumption and is safer and more economical, the construction process is simplified, and the progress and efficiency of shield construction in the boulder-bearing soil layer are improved.
Description
technical field [0001] The invention relates to the technical field of tunnel shield construction, in particular to a thermal rock-breaking disposal method for boulders in shield construction. Background technique [0002] With the continuous development of underground space, shield tunneling method is more and more widely used in tunnel construction of underground excavation method. The shield method is to advance the shield machine in the ground, and continuously support the tunnel through the shield casing and segments, thereby improving the degree of mechanical automation and high construction efficiency of tunnel construction. However, when excavating the soil with cutting devices in front of the excavation face, large boulders with a strength much higher than that of the soil will be encountered, resulting in excessive frontal resistance during the advancement of the shield, making it difficult to advance the shield or The problem of serious wear and tear of the chuck...
Claims
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IPC IPC(8): E21D9/08
CPCE21D9/08
Inventor 杨海清谢俊宁刘勃龙田国栋赵燕茹赵瑜
Owner CHONGQING UNIV