Guide damping hole-added small-section tunnel grooving method
A shock-absorbing hole and small-section technology, which is applied in the field of tunnel excavation, can solve the problems of wedge-shaped cutting construction difficulties, high usage of blasting equipment, and heavy drilling workload, so as to improve the blasting effect and increase the utilization rate of blastholes , the effect of improving the utilization rate
Active Publication Date: 2019-06-11
ROAD & BRIDGE INT +1
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Problems solved by technology
However, for small-section tunnels, full-section blasting excavation is mostly used. Due to the small section and wedge-shaped cuts are difficult to construct, straight-hole cuts are generally used in the form of straight-hole cuts. Disadvantages such as high usage of blasting equipment and large blasting vibration
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[0032] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the diagrams provided in the following embodiments are only schematically illustrating the basic concept of the present invention, and the following embodiments and the features in the embodiments can be combined with each other in the case of no conflict.
[0033] Wherein, the accompanying drawings are for illustrative purposes only, and represent only schematic diagrams, rather than physical drawings, and should...
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The invention belongs to the technical field of tunnel excavation, and discloses a guide damping hole-added small-section tunnel grooving method. The method comprises the steps of: (S1) drilling of adamping hole in the center position of a center groove at the middle lower part of a face; (S2) construction of grooving holes: distribution of four grooving holes; formation of the grooving holes around the damping hole in a rhombus form; arrangement of two acute angles of the rhombus on the vertical center line of a tunnel; and arrangement of two obtuse angles at the middle lower part of the section of the tunnel; (S3) drilling of guide holes between two adjacent grooving holes; arrangement of four guide holes at the middle parts of connecting lines of two adjacent grooving holes; and formation of through cracks between the grooving holes; (S4) drilling of auxiliary holes, base plate holes and peripheral holes; and arrangement of a fifth section, a seventh section, a ninth section, an eleventh section and a thirteenth section in sequence from inside to outside; (S5) hole cleaning; (S6) explosive filling; and (S7) blasting. The method effectively reduces the propagation of blasting vibration waves, and reduces the influence on surrounding environments by the blasting vibration.
Description
technical field [0001] The invention belongs to the technical field of tunnel excavation, and relates to a small-section tunnel cutting method for adding guiding damping holes. Background technique [0002] With the construction of the national transportation network, there are more and more tunnel constructions, and the construction environment is becoming more and more complex. At present, tunnel excavation construction is still dominated by blasting excavation, and blasting vibration is the most harmful blasting hazard, especially in complex environments with strict requirements on blasting vibration control. The study of tunnel blasting excavation and shock-absorbing measures has always been a research focus of tunnel blasting construction. Large-section highway tunnels are mostly excavated by step blasting. Due to the larger section and more flexible working space, a large-angle wedge-shaped cut can be used, which is conducive to the throwing of blasted rock blocks. ...
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IPC IPC(8): F42D1/00F42D3/04
Inventor 陈松洲高杰黄灿张华武
Owner ROAD & BRIDGE INT