I. Requirements for blasting operation conditions 1. Before the blasting, investigate the natural conditions and environmental conditions around the blasting area, understand the unfavorable environmental factors that endanger safety, and take necessary safety precautions.
2. Blasting operations (other than emergency blasting) shall not be carried out in any of the following circumstances in the blasting yard:
(1) The gas content in the wind flow within 20m from the working surface reaches or exceeds 1% or has signs of gas outburst.
(2) Blasting will cause water in the roadway, water leakage from the dam, severe blockage of the riverbed, and changes in spring water.
(3) The rock mass is dangerous to fall or the slope is slipping.
(4) The temperature of the palm chamber and the blasthole is abnormal.
(5) The concentration of harmful gases in the underground blasting operation area exceeds the regulations.
(6) Blasting may endanger the safety of buildings (buildings), public facilities or personnel without effective protective measures.
(7) The working channel is unsafe or blocked.
(8) The support specifications are inconsistent with the provisions of the support manual or the work surface support is damaged.
(9) There is no warning on the boundary of the dangerous area.
(10) Insufficient lighting, no lighting or illumination is not in compliance.
(11) Failure to prepare for the work as required by the regulations.
3. Before open-air or underwater blasting, contact with local meteorological and hydrological departments to master meteorological and hydrological data in a timely manner. When there are special severe weather and hydrological conditions, blasting should be stopped. All personnel should immediately evacuate to a safe place. .
4. When using an electric explosion network, investigate high-voltage electricity, radio frequency electricity, etc., and test the stray electricity; if it is found to be dangerous, take preventive or corrective measures immediately.
5. Avoid drilling through the residual blasthole when drilling near the residual hole. Under no circumstances should the residual hole be drilled.
Second, the blasting operation safety allowable distance provisions (a) general provisions 1. The blasting location and the safety allowable distance between personnel and other protected objects, should be determined according to various harmful effects of blasting (seismic waves, shock waves, individual scattered objects, etc.) And take the maximum value.
2. When determining the allowable distance for blasting safety, it should be considered that blasting may induce secondary harmful effects such as landslides, rolling stones, avalanches, swells, and pile slips, and appropriately expand the safety allowable distance or delineate additional dangerous zones for specific situations.
(2) Safety allowable distance for various blasting hazards 1. Allowable distance for blasting vibration safety (1) Evaluate the vibration impact of blasting on different types of buildings (buildings), facilities and other protective objects, and adopt different safety criteria And allow the standard.
(2) The blasting vibration criterion of ground building, power station (plant) central control room equipment, tunnel and roadway, rock high slope and newly poured mass concrete, adopting the peak vibration speed and main vibration frequency of the base particle at the location of the protection object. The specific requirements of the safety permit standard are specified by the Blasting Safety Regulations.
(3) The safety allowable distance for high-rise building (structure) demolition blasting includes the safety distance of the collapse of the building (structure) and the safety distance of the blasting vibration.
2. Blasting air shock wave and water shock wave and surge safety allowable distance (1) When the blasting explosive amount of open-air surface blasting does not exceed 25kg, the safety allowable distance of the air shock wave to the occupant in the shelter should be calculated according to the regulations.
(2) Underwater bare blasting, when the thickness of the covered water is less than 3 times the radius of the package, the principle of calculating the allowable distance of the air shock wave for the person above the water surface or other protection objects is the same as that of the surface blasting.
(3) Underwater blasting in critical hydraulic works, port facilities and aquaculture farms or other complex environments should be assessed by testing and inviting experts to assess the impact of shock waves and surges in the water to determine the safe allowable distance.
(4) The blasting in water or the blasting of a large number of slag falling into the water should evaluate the impact of blasting surges to ensure that no dams and reservoirs are checked for water surges, that they do not inundate the shores and that they do not cause damage to the ship.
3. Safety allowable distance of individual flying materials When the general engineering blasting, the safety distance of individual flying objects to personnel shall not be less than the "blasting safety regulations") GB6722â†2014 corresponding regulations;
The safety distance of individual scattered objects in chamber blasting shall be calculated and determined according to the method specified in GB 6722-2014.
4. Other regulations (1) When the power is detonated, the safety allowable distance between the explosion zone of the ordinary electric detonator and the high-voltage line shall be in accordance with the provisions of Table 1G43201l;
(2) Hand-held or other mobile communication devices shall not be brought into the ordinary electric detonator explosion area.
2. Blasting operations (other than emergency blasting) shall not be carried out in any of the following circumstances in the blasting yard:
(1) The gas content in the wind flow within 20m from the working surface reaches or exceeds 1% or has signs of gas outburst.
(2) Blasting will cause water in the roadway, water leakage from the dam, severe blockage of the riverbed, and changes in spring water.
(3) The rock mass is dangerous to fall or the slope is slipping.
(4) The temperature of the palm chamber and the blasthole is abnormal.
(5) The concentration of harmful gases in the underground blasting operation area exceeds the regulations.
(6) Blasting may endanger the safety of buildings (buildings), public facilities or personnel without effective protective measures.
(7) The working channel is unsafe or blocked.
(8) The support specifications are inconsistent with the provisions of the support manual or the work surface support is damaged.
(9) There is no warning on the boundary of the dangerous area.
(10) Insufficient lighting, no lighting or illumination is not in compliance.
(11) Failure to prepare for the work as required by the regulations.
3. Before open-air or underwater blasting, contact with local meteorological and hydrological departments to master meteorological and hydrological data in a timely manner. When there are special severe weather and hydrological conditions, blasting should be stopped. All personnel should immediately evacuate to a safe place. .
4. When using an electric explosion network, investigate high-voltage electricity, radio frequency electricity, etc., and test the stray electricity; if it is found to be dangerous, take preventive or corrective measures immediately.
5. Avoid drilling through the residual blasthole when drilling near the residual hole. Under no circumstances should the residual hole be drilled.
Second, the blasting operation safety allowable distance provisions (a) general provisions 1. The blasting location and the safety allowable distance between personnel and other protected objects, should be determined according to various harmful effects of blasting (seismic waves, shock waves, individual scattered objects, etc.) And take the maximum value.
2. When determining the allowable distance for blasting safety, it should be considered that blasting may induce secondary harmful effects such as landslides, rolling stones, avalanches, swells, and pile slips, and appropriately expand the safety allowable distance or delineate additional dangerous zones for specific situations.
(2) Safety allowable distance for various blasting hazards 1. Allowable distance for blasting vibration safety (1) Evaluate the vibration impact of blasting on different types of buildings (buildings), facilities and other protective objects, and adopt different safety criteria And allow the standard.
(2) The blasting vibration criterion of ground building, power station (plant) central control room equipment, tunnel and roadway, rock high slope and newly poured mass concrete, adopting the peak vibration speed and main vibration frequency of the base particle at the location of the protection object. The specific requirements of the safety permit standard are specified by the Blasting Safety Regulations.
(3) The safety allowable distance for high-rise building (structure) demolition blasting includes the safety distance of the collapse of the building (structure) and the safety distance of the blasting vibration.
2. Blasting air shock wave and water shock wave and surge safety allowable distance (1) When the blasting explosive amount of open-air surface blasting does not exceed 25kg, the safety allowable distance of the air shock wave to the occupant in the shelter should be calculated according to the regulations.
(2) Underwater bare blasting, when the thickness of the covered water is less than 3 times the radius of the package, the principle of calculating the allowable distance of the air shock wave for the person above the water surface or other protection objects is the same as that of the surface blasting.
(3) Underwater blasting in critical hydraulic works, port facilities and aquaculture farms or other complex environments should be assessed by testing and inviting experts to assess the impact of shock waves and surges in the water to determine the safe allowable distance.
(4) The blasting in water or the blasting of a large number of slag falling into the water should evaluate the impact of blasting surges to ensure that no dams and reservoirs are checked for water surges, that they do not inundate the shores and that they do not cause damage to the ship.
3. Safety allowable distance of individual flying materials When the general engineering blasting, the safety distance of individual flying objects to personnel shall not be less than the "blasting safety regulations") GB6722â†2014 corresponding regulations;
The safety distance of individual scattered objects in chamber blasting shall be calculated and determined according to the method specified in GB 6722-2014.
4. Other regulations (1) When the power is detonated, the safety allowable distance between the explosion zone of the ordinary electric detonator and the high-voltage line shall be in accordance with the provisions of Table 1G43201l;
(2) Hand-held or other mobile communication devices shall not be brought into the ordinary electric detonator explosion area.
Unlike many other bearings, Integral Shaft Bearings do not have an inner ring and instead work off of an inner race that is machined directly into the internal shaft. So what exactly makes up an integrated shaft bearing? Product specifications include:
• Chrome or stainless steel spindle shaft
• Thorough hardened chrome steel for outer race
• Chrome steel balls
• Steel or nylon cage designs available
• Steel shields closures as well as synthetic rubber, metal encased rubber, and metal encased labyrinth seals
• Soft shaft and engineered specials available
INTEGRAL SHAFT BEARING FEATURES
Due to their design, integral shaft bearings are very compact, allowing for either two rows of balls or a row of balls and a row of rollers. Our bearings are pre-packed with lubricant to ensure a long lifespan and are sealed to resist contamination.
Integral Shaft Bearings
Integral Shaft Bearings,Integral Shaft Bearing Catalog,Integral Shaft Water Pump Bearings,Precision Integral Shaft Bearing
Ningbo Ritbearing Imp & Exp Co.,Ltd. , http://www.ritbearingchina.com