Loose blasting excavation construction method of intermediary weathered sandstone stratum rock
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A technology of loose blasting and construction methods, applied in blasting and other directions, can solve the problems of prolonging the construction period, excessive blasting force, poor blasting quality, etc., and achieve the effect of high blasting quality
Active Publication Date: 2019-06-11
CHINA MCC5 GROUP CORP +1
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[0005] The purpose of the present invention is to solve the problem of unreasonable design of blast hole layout parameters, too large or too small blasting force, and poor blasting quality, resulting in repeated construction in the later stage and prolonged In order to overcome the technical problems of the construction period, the invention provides a construction method for loosening and blasting excavation of stonework in moderately weathered sandstone layers
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Embodiment 1
[0042] like figure 1 As shown, the present embodiment provides a construction method for loosening and blasting excavation of medium-weathered sandstone layers, including the following steps: (1) leveling the drilling rig work site; (2) laying holes and charging explosives; (3) network connection; (4) blasting safety alert; (5) blasting, in step (2), when digging depth less than 5m in the lot, the technical parameters of blast hole arrangement are as follows:
[0043] ① Blast hole inclination angle δ: δ=75°;
[0044] ②Bunker hole diameter d: d=40mm;
[0045] ③Step height H: H≥(0.060-0.064)d, that is, H≥2.4-2.56mm, where H=4m;
[0046] ④ Blast hole depth h: h is approximately equal to the excavation depth or step height H, and h≥0.8m, where h=4m;
[0047] ⑤ Minimum resistance line W: W=(0.6-0.8)H, where W=0.8H=3.2m;
[0048] ⑥ Overdrilling depth h1 at the bottom of the blast hole: h1 = 0.25W = 0.8m;
[0049] ⑦Clogging length h0: h0=0.9W=2.88m;
[0050] ⑧ Blast hole spacin...
Embodiment 2
[0068] This embodiment is further optimized on the basis of embodiment 1. Specifically, in step (2), the clay with a certain humidity is selected for backfilling the clogged material after charging, and is backfilled in multiple times, and wood is used for backfilling. The purpose of tamping with a stick is to prevent holes from being stuck.
Embodiment 3
[0070] This embodiment is further optimized on the basis of Embodiment 1. Specifically, in step (3), the network connection adopts double detonators and double nonel networks. Then connect the detonator.
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Abstract
The invention discloses a loose blasting excavation construction method of an intermediary weathered sandstone stratum rock, and relates to the technical field of rock blasting construction methods. The loose blasting excavation construction method of the intermediary weathered sandstone stratum rock comprises the following steps that (1) a drilling machine working field is leveled; (2) hole distribution and medicine loading are conducted; (3) network connection is conducted; (4) safety alert is blasted; and (5) blast firing blasting is conducted. In the step (2), blast hole distribution technical parameters on districts with the digging depth less than 5 meters and districts with the digging depth great than 5 meters are accurately calculated, thus the blasting parameters are strictly controlled, the technical parameters comprise a blast hole inclined angle, a blast hole diameter, a step height, blast hole depth, the minimum resistance line, over-drilling depth of blast hole bottom, ablocking length, blast hole distance, blast array pitch, the medicine loading amount of each blast hole. The loose blasting excavation construction method of the intermediary weathered sandstone stratum rock has the advantages that blasting power control is precise and accurate, the blasting quality is high, and stability of a roadbed slope and safety of houses and personnel nearby can be ensured.
Description
technical field [0001] The invention relates to the technical field of rockwork blasting construction methods, and more particularly relates to a rockwork loosening blasting excavation construction method in a moderately weathered sandstone layer. Background technique [0002] When blasting rockwork on hills, different blasting schemes need to be selected according to different geology. Common geological layers include strongly weathered mudstone, moderately weathered mudstone, strongly weathered sandstone, and moderately weathered sandstone. Among them, the moderately weathered sandstone layer (Class V Stone) belongs to the sub-hard stone. When excavating the stone, it cannot be excavated with an excavator. Loosening blasting or smooth blasting can be used. Therefore, it is very important to arrange the location of the blast holes reasonably. [0003] Among them, the loose blasting technology refers to a blasting technology that makes full use of the blasting energy to mak...
Claims
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