Vibration absorbing method for cut presplitting blasting

A pre-split blasting and pre-splitting technology is applied in the field of urban subway tunnel excavation and blasting, which can solve the problems of particularly prominent vibration phenomenon, and achieve the effect of reducing the blasting vibration speed and reducing the impact.

Inactive Publication Date: 2013-02-13
CHINA UNIV OF MINING & TECH (BEIJING)
View PDF4 Cites 44 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the construction process of the drilling and blasting method, the explosive explosion will produce negative effects such as blasting vibration and shock waves; due to its shallow buried depth, the vibration phenomenon on the ground during the tunnel blasting excavation is particularly prominent; therefore, when formulating the construction plan of the drilling

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Vibration absorbing method for cut presplitting blasting
  • Vibration absorbing method for cut presplitting blasting
  • Vibration absorbing method for cut presplitting blasting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This embodiment discloses a full-section blasting scheme of a subway tunnel with a blasting excavation cycle footage of 1.5m using the cutting pre-splitting blasting shock absorption method. blastholes, auxiliary holes, peripheral holes and floor holes; the pre-splitting blastholes are a group of blastholes arranged horizontally at 500mm to 600mm above the cut hole, and the transverse spacing of the pre-splitting blastholes is 350mm to 500mm. Mixed one-piece slit charges are used for charging; slotting eyes, auxiliary eyes, peripheral eyes and bottom plate eyes are charged with ordinary emulsion explosives; the delay time is the first series of milliseconds specified in the national standard GB19417-2003 "Nel Detonator" The nonel detonator adopts the connection of millisecond nonel detonator with a segment number of 1; the detonation sequence of the blast hole is: pre-splitting blast hole, cut hole, auxiliary hole, peripheral hole and bottom plate hole.

[0030] The cut...

Embodiment 2

[0042] This embodiment discloses a blasting scheme for the upper steps of a subway tunnel with a blasting excavation cycle footage of 1.5m using the cutting pre-splitting blasting shock absorption method. blastholes, auxiliary holes, peripheral holes and floor holes; the pre-splitting blastholes are a group of blastholes arranged horizontally at 500mm to 600mm above the cut hole, and the transverse spacing of the pre-splitting blastholes is 350mm to 500mm. Mixed one-piece slit charges are used for charging; slotting eyes, auxiliary eyes, peripheral eyes and bottom plate eyes are charged with ordinary emulsion explosives; the delay time is the first series of milliseconds specified in the national standard GB19417-2003 "Nel Detonator" The nonel detonator adopts the connection of millisecond nonel detonator with a segment number of 1; the detonation sequence of the blast hole is: pre-splitting blast hole, cut hole, auxiliary hole, peripheral hole and bottom plate hole.

[0043] ...

Embodiment 3

[0054] This embodiment discloses a hybrid conjoined slitting charge used for pre-splitting blastholes with a depth of 1.5m. Slit medicine pack.

[0055] Such as Figure 8 , the mixed one-piece slotted charge includes a slotted tube, explosives, anhydrous taphole mud, water tapped clay, and detonating cord; the sidewall of the slotted tube is axially provided with two symmetrical slots 801- 1 antistatic flame-resistant PVC pipe 801, the explosive is an emulsion explosive roll; three sections of the explosive roll 802 are provided in the slit pipe, and each section of the explosive roll is connected with the detonating cord 806. Two sections of water blasting mud 803 are arranged between the explosive rolls, an anhydrous blasting mud 804 is filled at the end of the slit pipe toward the opening end of the blasthole, and sealed with waterproof black adhesive tape 805 at the end of the slit pipe toward the bottom end of the blasthole; The dimensions and specifications of each par...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Horizontal spacingaaaaaaaaaa
Lengthaaaaaaaaaa
Vertical depthaaaaaaaaaa
Login to view more

Abstract

The invention relates to a vibration absorbing method for cut presplitting blasting, which comprises the steps that blasting tunneling is performed on a face of a subway tunnel; a gadder is used to drill blastholes including presplitting blastholes, cutholes, assistance holes, periphery holes and bottom plate holes; the presplitting blastholes are a group of transversely arranged blastholes that are located 500mm-600mm above the cutholes; the presplitting blastholes adopt mixed connected kerf cartridges for explosive loading; the cutholes, the assistance holes, the periphery holes and the bottom plate holes adopt common emulsion explosive loading, and adopt millisecond nonel detonators; and the presplitting blastholes, the cutholes, the assistance holes, the periphery holes and the bottom plate holes are initiated in sequence. The vibration absorbing method has the benefits that as a presplitting surface and a presplitting crushed zone are formed above the cutholes, the vibration is reduced and absorbed in transmission paths, the vibration velocity caused by the cut blasting is reduced obviously, and blasting vibration can be controlled effectively. Compared with the traditional smooth blasting, the maximum blasting vibration velocity can be reduced by 30%, and effects on protected heritages along a line are reduced.

Description

technical field [0001] The invention belongs to the excavation and blasting technology of urban subway tunnels, and in particular relates to a cutting pre-splitting blasting shock absorbing method, which is applicable to the blasting of urban subway tunnels passing through cultural relics areas in a short distance in rock formations. Background technique [0002] At present, with the rapid development of urban rail transit, underground railways in cities and suburbs, elevated railways on the ground and ground rails constitute a transportation network. Subway traffic has become the most important part of urban traffic because of its convenience, speed, environmental protection, and large transportation capacity. [0003] In cities where the geological conditions are dominated by rocks, the drill and blast method is usually used for construction. The drill and blast method has the advantages of low construction cost, high excavation efficiency, and easy operation, and has beco...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): F42D1/00F42D1/08
Inventor 杨仁树车玉龙孙强
Owner CHINA UNIV OF MINING & TECH (BEIJING)
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap