Reverse blasting excavation method of shaft and pilot shaft

Abstract

The invention discloses a reverse blasting excavation method of a shaft and a pilot shaft. The method comprises the following steps that firstly, construction of a drilling platform is carried out; secondly, center hole drilling construction is carried out; thirdly, auxiliary blasting hole drilling construction is carried out; fourthly, a soil body unit and a blasting hole section are divided; fifthly, reverse blasting excavation is carried out; and sixthly, whether the shaft and the pilot shaft are connected or not is judged, and whether a to-be-excavated soil body of the shaft and the pilot shaft is totally excavated or not is checked, wherein if yes, it is proved that the shaft and the pilot shaft are connected, and excavation of the shaft and the pilot shaft is finished, and if not, excavation continues according to the manner of the fifth step. According to the reverse blasting excavation method, during blasting excavation construction, an operator does not need to enter a face for operation, potential safety hazards caused by well wall chipping, collapsing and the like are avoided, the life safety of the operator is guaranteed, and the reverse blasting excavation method is especially suitable for excavation of the shallow shaft and the shallow pilot shaft below 30 m.

Description

technical field [0001] The invention belongs to the technical field of shaft guide shaft excavation, and in particular relates to a reverse blasting excavation method for a shaft guide shaft. Background technique [0002] In the construction of water conservancy and hydropower projects, the construction of vertical shaft structures such as gate shafts, surge shafts, cable shafts and ventilation shafts is often encountered. During construction, the slag guide shaft is generally excavated first, and then expanded. The slag slides through the slag guide shaft to the lower flat hole for slag discharge. At present, there are many methods for excavating shaft guide shafts. For the excavation of shallow shaft guide shafts within 30m, if conventional methods are used for construction, there are not only defects such as high cost and long construction period, but also construction safety risks. With the improvement of my country's engineering blasting technology, engineering blastin...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the operator needs to enter the excavation face, which has a greater safety risk;

[0007] Fourth, the front shaft method: it is a method of excavating a vertical shaft from top to bottom. The operator of this method needs to enter the working face. The disadvantage is that the blasting slag needs to be manually loaded with a slag bucket and lifted out of the well through the hoisting equipment at the well head;

[0008] To sum up, for the excavation of shallow shaft guide shafts, the above-mentioned conventional shaft guide shaft excavation methods all have some deficiencies and limitations in use conditions to varying degrees.

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