The depth of the tunnel should be more than 10m, and there should be an angle of 60 degrees with the middle line of the tunnel
.
The remaining materials after blasting shall be returned to the warehouse in time after being checked and verified by a specially assigned person
.
5
.
E
.
2) Detonators and explosives shall be transported separately, and electric detonators shall be transported in insulated boxes
.
B
.
15
.
Blasting operation must be in accordance with the current national standard “blasting safety regulations” (GB6722), the preparation of blasting design scheme, formulate the corresponding technical measures
.
The charging should meet the following requirements: 1) before charging, the non charging personnel should evacuate from the charging place; fireworks are prohibited in the charging area; after charging, the number and place of charging should be checked and recorded; 2) metal containers should not be used for charging; 3) the primary explosive package should be made at the time of charging on site
.
7
.
Charging and drilling shall not be operated in parallel
.
D
.
5.3.5 the transportation of blasting materials shall meet the following requirements: 1) the transportation of blasting materials in the tunnel and auxiliary tunnel shall meet the following requirements: 1) it shall be escorted by special personnel, and other personnel shall not take it
.
(4) Drilling in the residual hole is not allowed
.
In case of thunderstorm, the blasting operation shall be stopped and the dangerous area shall be evacuated quickly
.
1、 Portal project 1
.
Ventilation and smoke exhaust must be conducted after blasting, and inspectors can enter the excavation face for inspection 15 minutes later
.
The reversing in the tunnel shall be directed by a specially assigned person
.
The drilling operation should meet the following requirements: (1) before drilling, the safety state of the working environment should be checked, and the drilling operation can only be carried out after the pumice on the excavation surface is removed and the misfire is handled
.
(3) When drilling with electric drill, it is not allowed to guide the rotary drill rod by hand or treat the clamped drill rod with electric drill
.
If the distance between the hole and the excavation face is more than 1000m, the processing room can be set up in the appropriate place in the hole, but the following requirements should be met: a
.
Scaffolding shall not obstruct the passage of vehicles
.
not less than 500m in the excavation of full section of double track
.
Open fire shall not be used for blasting in the tunnel
.
6
.
3
.
2
.
Set up obvious signs and special personnel to guard
.
When it is necessary to blast at night, effective safety measures should be taken
.
(2) The support of rock drill shall keep the stability of the ballast pile when drilling holes on the ballast pile
.
2
.
12
.
3) The primary charge should be refilled after the plug is removed
.
The processing room shall be set in solid surrounding rock, and railings shall be set, and irrelevant personnel are strictly forbidden to enter
.
9
.
The blasting operation shall meet the specified requirements
.
4) In case of the following situations, it is strictly forbidden to charge blasting a, insufficient lighting B, broken surrounding rock of the excavation face without support
.
For tunnel excavation, corresponding safety technical measures shall be formulated according to various construction methods and geological conditions
.
10
.
Blasting materials shall be extracted by the person in charge of charge according to one-time demand
.
The initiation shall meet the following requirements: 1) when there is lightning and thunder nearby, or when there is cloud and rain, it may suddenly occur lightning, it is strictly forbidden to use electric detonator for initiation
.
During the operation of the ballast loading machine, no one is allowed to pass within its turning range
.
2、 Excavation 1
.
the storage dose is limited to the amount of the drug on duty
.
Table 5.3.4 limit speed of transport vehicles (km / h) item operation section non operation section tunnel section normal driving 102020 tractor 51515 meeting vehicle 51010 2 in the entrance, level crossing and narrow construction site, slow signs shall be set up, and special person shall be assigned to guide the traffic when necessary
.
There are quicksand and mud without treatment
.
D
.
When loose rock or collapse sign is found, it must be treated before loading
.
C
.
The following requirements should be met in dealing with misfire: 1) the original pharmacist should deal with the misfire on the spot; when dealing with the misfire, the alert should not be removed; in case of special circumstances, the next blasting or rest can be done with the permission of the person in charge of the construction; obvious signs should be set at the misfire position, and personnel are not allowed to pass within 5m around it
.
(2) Safety net shall be set up during construction of end wall above arch line to prevent falling of personnel, tools and materials
.
It is strictly forbidden to overtake when vehicles are running; when vehicles meet, the safe distance between the two workshops should be greater than 20m, and the visibility in the tunnel should be increased
.
6) Ammonium nitrate explosives can be diluted with water
.
Before and during the ballast loading, the stability of the surrounding rock of the excavation face shall be checked
.
2) When there are several blasting points in the same construction section at the same time, it must be under unified command
.
The construction of tunnel door and end wall shall meet the following requirements: (1) the scaffold and working platform of masonry engineering shall be set up firmly, with handrails and railings
.
4) No more drilling in the eyes of the disabled
.
After blasting, the loose stones on the slope should be removed before the construction can continue
.
All construction equipment and machinery close to the vehicle gauge shall be equipped with low-voltage red flashing light at the outer edge to display the gauge
.
not less than 200m in the single heading tunnel; B
.
3
.
8
.
Before all the warning and protection work is completed, it is strictly forbidden to detonate at any place
.
not less than 50m in the adjacent tunnels, cross passages and cross tunnels; D
.
There are no good ones
.
5) A parallel hole can be drilled at a distance of not less than 0.6m from misfire to induce explosion
.
3) Before delivery, the winch driver and the liaison personnel at the wellhead shall be informed.
.
2
.
The inspection contents include: whether there is misfire; whether there is residual explosive or detonator; whether there is loose surrounding rock in the roof and two sides; whether the support is damaged and deformed
.
4
.
Explosives that produce a large amount of harmful gases shall not be used for blasting in tunnels
.
4
.
(3) Vehicles and personnel are not allowed to pass when lifting materials
.
C
.
not less than 100m in the adjacent upper and lower tunnels; C
.
The construction of portal project shall meet the following requirements: (1) the subgrade, side slope and front slope section of portal shall be excavated from top to bottom, and the earthwork works shall be completed at one time, and the excavation personnel shall not overlap up and down
.
5
.
The clearance of excavation section shall meet the safe operation of ballast loading machinery; 2
.
The handle of the detonator shall always be kept by the blasting team leader
.
3
.
(2) The loose and dangerous rocks on the hillside above the side and front slopes shall be removed before excavation; frequent inspection shall be conducted during construction, and the loose and dangerous rocks must be removed immediately
.
6
.
5.3.4 trackless transportation shall comply with the following provisions: 1
.
14
.
When blasting, the blaster should carry a flashlight and set up fault lighting
.
After the earth rock excavation at the end wall, the loose rock stratum shall be supported
.
16
.
3、 Blasting operation should meet the following requirements: 1
.
The blasting equipment processing room should be 50m away from the hole
.
The limited speed of transportation vehicles shall comply with the provisions in table 5.3.4
.
not less than 400m in the excavation of upper section of double track; e
.
When the geology is bad, the side and front slopes should be reinforced
.
13
.
When the distance between two opposite excavation faces is only 15m, only one excavation face is allowed to be cut through, and the other end shall stop working, remove personnel and equipment, and set warning signs at the safe distance
.
2
.
When new mechanical equipment is used, the line laying standard shall meet the requirements of mechanical gauge
.
11
.
5.3.2 the ballast loading operation shall meet the following requirements: 1
.
The road surface at the place where the ballast is unloaded outside the tunnel should be made into an uphill section of 4%, and the blocking wood should be set at the place away from the edge of the ballast pile
.
5) When blasting in the tunnel, all personnel must evacuate, and the safety distance for evacuation shall be: A
.
The following protection work should be done before blasting: 1) blasting should be supervised and directed by the person on duty; 2) warning personnel must be set around the warning area; warning range: small charge blasting should be 200m away from the shooting site, and the warning distance of more charge blasting should be determined by calculation; 3) people and livestock in the warning area should be evacuated, and the construction equipment should be reliable 4) in the construction section where there are vehicles and ships passing through, the blasting time should be determined and the relevant transportation department should be contacted in advance
.
4、 Ballast loading and transportation (1), ballast loading and transportation shall meet the following requirements: 1
.
2) When the blasting circuit, fuse and detonating cord in the blasting hole are in good condition, the lead or wire can be re connected and then detonated
.
There are a lot of cave water and high pressure water gushing out, which has not been treated
.
Blasting should not be carried out in foggy days, dusk and night
.
In blasting operation, corresponding protective measures should be taken according to the specific conditions of terrain, geology and construction area environment
.
