Some standard content:
National Standards of the People's Republic of China
Saftey regulations for explosive demolition1
GB 13533—92
Saftey regulations for explosive demolition1 Subject and applicable scope Provisions are made on design, construction, undertaking qualifications, safety assessment, post-explosion inspection, hidden danger handling, review procedures and safety management.
This standard applies to units and their competent departments and personnel engaged in civil demolition and blasting within the territory of the People's Republic of China. 2 Reference Standards
2 Blasting Safety Regulations
GB6722
3 Terms
Demolition blasting - the purpose of demolishing ground, underground and underwater structures Controlled blasting. 4. Qualification and review
4.1 Classification of demolition blasting
According to the environmental conditions around the demolition object, the category of the demolition object, and the scale of blasting, it is divided into three levels: A, B, and C. 4.1.1 Those who have one of the following conditions are classified as Class A: a. The environment is very complex, and blasting may endanger national first- and second-level cultural relics protection objects, extremely important facilities, extremely precise instruments and important structures.
b. The height of the demolished building exceeds 10 floors, and the height of the smoke window (or tower) exceeds 80m. c. The amount of explosive used in one blast is more than 200kg. 4.1.2 Those with any of the following conditions are classified as Class B: a. The environment is complex and blasting may endanger national third-level or provincial-level cultural relics protection objects, residential buildings and factories. The demolished buildings will be 5 to 10 stories high, and the smoke windows (or towers) will be 50 to 80 meters high. b.
c.
-The amount of explosive used for one blast is 50~200.kg. 4.1.3 Those who meet the following conditions are classified as Class C: a. The environment is not complicated, and blasting will not endanger surrounding buildings (structures). b. The height of the demolished building is less than 5 floors and the height of the smoke (or tower) is less than 50m. c. The amount of explosive used in one blast is less than 50kg. 4.2 Qualifications
4.2.1 The unit responsible for demolition blasting must hold the "Explosives Use License" issued by the local county or city public security bureau. 4.2.2 The unit responsible for the design and construction of Class A demolition blasting must Meet the following conditions: no fewer than 2 blasting engineering technicians with senior technical titles; a.
b. Have practical experience in demolition blasting design and construction above level B. Approved by the State Bureau of Technical Supervision on June 29, 1992 and implemented on March 1, 1993 | Meet the following conditions: a. There shall be no less than one blasting engineering technician with a senior technical title; b. Practical experience in the design and construction of demolition blasting of level C or above. 4.2.4 Units undertaking the design and construction of level C demolition blasting must meet the requirements The following conditions: a. There shall be no less than 2 blasting engineering technicians with intermediate technical titles; b. Participated in the design or construction of general demolition blasting and has general demolition blasting experience. 4.2.5 No individual may undertake demolition and blasting projects. 4.3 Review
4.3.1 Class A demolition blasting design must be reviewed by the local county or city public security bureau and then reported to the provincial, autonomous region, or municipality public security department (bureau) for review and approval.
The 4.3-2B level demolition blasting design must be reviewed by the local county and city public security bureau and then reported to the local (city) level public security bureau for review and approval. 4.3.3C-level demolition blasting design shall be reviewed and approved by the local county and municipal public security bureau. 4.3.4 During the review, a safety assessment should be conducted. The safety assessment should include the following contents: the safety of the environment around the demolition object;
a.
b.
the safety of the blasting method,
the safety of the detonation network performance, reliability;
c.
Quality of construction personnel;
d.
Construction organization,
e.
accidents emergency response measures.
f,
5 Design
5.1 Design Steps
5.1.1 Class A and B demolition blasting must be approved by the competent department at or above the county (city) level Design can only be carried out after the official approval document for demolition of the object by blasting method.
5.1.2 The design shall be carried out according to the steps of technical design, construction organization design and design review. Level A demolition blasting should strictly follow the above three steps; Level B and C demolition blasting can combine technical design and construction organization design at one time. 5.2 Design content and approval
5.2.1 Technical design should include the following contents: Project overview: condition of demolition objects, surrounding environment of blasting area, requirements and purpose of blasting and demolition, etc., a.
b. Plan selection: Compare dismantling methods and plans, demonstrate their safety and rationality, etc.: c. Determination of blasting parameters: determination and calculation of dismantling range and height, structural stability analysis, explosive package parameters and layout, detonation sequence and delay Time, etc.:
d.
Charging: Selection of explosive types, calculation of unit explosive consumption and single hole charge, charging method and filling structure: e. Blasting network design: selection of detonating equipment , Explosion energy and method, Explosion network connection form and method, f. Safety distance: Calculate blasting ground capsule effect, air shock wave, flying rocks, collapse impact range and safety distance of impact vibration, noise and warning range,
Accident prevention and treatment technology: Estimated possibility of accidents and Its control and processing methods; g.
technical design drawings: plan view of the surrounding environment of the explosion area, plan and surface plan of the demolition object, package layout and loading structure diagram, detonation network h.
connection Pictures, safety warning pictures, safety protection and coverage measures attached with pictures and text descriptions. 5.2.2 The construction organization design should include the following contents: Construction method: selection and quantity of methods, equipment, machines and materials: a.
Organization and management: command and management organization, work system, construction sequence and progress, supervision and inspection System; b.
Construction safety: blast hole acceptance system, blasting equipment transportation and storage requirements, detonating charge package processing and filling technology and requirements, explosion area warning c.
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Methods, systems and detonation procedures, etc.
GB13533—92
5.2.3 After the design personnel sign, the design documents must be reviewed, signed and approved by the design review personnel and the supervisor. 6 Safety Management Technology
6.1 Explosive Equipment Management
6.1.1 To dismantle the blasting equipment required for blasting, you must apply to the local county or city public security bureau to obtain an "Explosives Purchase Certificate", and the certificate must be submitted to the designated supply point for purchase. It is strictly prohibited for any unit or individual to take, give away, transfer, repurchase or lend explosive equipment without permission. 6.1.2 When transporting explosive equipment outside the enterprise, you must apply for an "Explosives Transport Certificate" from the local county (city) Public Security Bureau. Transport in accordance with the transportation time, route, transportation means, type, quantity, departure location, arrival location, etc. specified by the Public Security Bureau, and assign a dedicated escort.
6.1.3 With the approval of the local county (city) public security bureau, it is allowed to use houses, earthen kilns, vehicles, etc. with strong structures and uninhabited by people as temporary storage points for blasting equipment.
6.1.4 The following regulations must be followed for the storage of explosive equipment: designated personnel shall be assigned to guard it;
a.
It shall not be stored without the "Explosives Transport Certificate" issued by the Public Security Bureau or other required procedures. , the type and quantity of blasting equipment are unknown b.
shall not be stored;
c. Store according to the time limit, variety and quantity specified by the Public Security Bureau, and register the sending and receiving equipment in a timely manner to ensure that the accounts are consistent; d.
e. It is strictly prohibited to keep items unrelated to blasting equipment in the same room. 6.1.5 During the charging process, when placing blasting equipment at the work site, the following regulations must be followed: a.
Only blasting equipment used on duty is allowed to be placed; b.
Detonators or detonating bodies are not allowed to be placed in contact with Explosives should be kept together; there should be dedicated personnel to supervise the blasting equipment.
c.
6.1.6 The following regulations must be followed for the processing of medical packages:. It is strictly prohibited to process explosive packets in explosive equipment storage places or residences; processing of explosive packets is allowed in safe places such as separate rooms and tents near the operation site, and the processing quantity is determined according to the design, b.
c. Processing personnel must maintain a certain distance between each other. When there are isolation and protection facilities, it is not less than 1.5m. When there are no isolation and protection facilities, it is not less than 3m.
The amount of blasting equipment stored must not exceed the amount used on the shift, d .
No unrelated persons are allowed to approach the pharmaceutical package processing site. e.
6.1.7 Destruction of blasting equipment must strictly comply with the relevant regulations of GB6722. 6.2 Covering of demolition objects
6.2.1 When demolition and blasting are carried out in places that may endanger personnel safety or cause damage to adjacent buildings (structures) and important facilities, the demolition objects must be covered.
6.2.2. The covering material should be easy to fix, not easy to scatter and break, and can prevent the penetration of small fragments. 6.2.3 When the size of the demolition objects is small, there are important protected targets nearby, and there are frequent activities of people around, multi-layer coverage should be provided. The coverage area should be larger than the distribution range of blast holes.
6.2.4 When covering, the following regulations must be complied with: a.
Protect the detonation network;
When covering with metal, the joints in the electric explosion network should be insulated Wrap it with tape to prevent short circuit; b.
c.
d.
e.
Check carefully to prevent leakage;
Bundle firmly, Prevent the covering from slipping and being thrown away; when detonating in sections, prevent the covering from being affected by the first explosive package and causing it to slip and be thrown away in advance. 557
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6.2.5 Barriers should be set up in the direction of key protected objects and the main direction in which flying objects are thrown. Its height and length should be able to completely block flying debris.
6.2.6 When there are important equipment and facilities that cannot be moved or relocated in the danger zone, they should be protected. 6.3 Protection and traffic control of facilities, buildings (structures) and roads around demolished objects 6.3.1 Protection of facilities and buildings (structures) around demolished objects shall comply with the following regulations: a: Determine the safety of ground particles of protected objects Allowable vibration speed; limit the maximum amount of blasting charge in one section. b. Evaluate the impact of the vibration of the demolished object on the protective object when it collapses and touches the ground. If necessary, a buffer layer such as coal ballast can be laid within the collapsed area or effective measures such as digging anti-seismic ditches for isolation can be taken.
c. When demolishing high-rise buildings such as smoke windows and water towers, the possibility of the debris rolling, rushing forward or receding after the explosion should be considered, and corresponding protective measures should be taken.
d．
Sprinkle water on the surface of the demolition object and the nearby ground. e. Use key coverage and barriers for protected objects. 6.3.2 The protection and traffic control of roads around demolished objects should comply with the following regulations: make the collapse direction and the main throwing direction of flying objects deviate from the protection target, and control the collapse distance of the debris; a.
adopt reliable measures and strictly Control the scattering range of individual flying objects; b.
c. Strictly regulate the areas and times for cutting off traffic and blocking roads. 6.4 Stopping and restoring water, electricity, gas, and communications 6.4.1 Based on the environmental conditions of the demolition object and blasting plan, the construction unit must demonstrate the safety of surrounding water, electricity, gas, and communications, and propose corresponding safety technical measures.
6.4.2 When public facilities are within the scope of blasting effects, the construction unit shall submit a report on "water, electricity, gas, and communication cessation" to the relevant competent authorities, and construction can only proceed with the consent of the relevant competent authorities. 6.5 Influence and control of miscellaneous electricity, radio frequency electricity, and weather 6.5.1 When there are various power sources and power facilities near the demolished object, special instruments must be used to detect stray currents. When the stray current value exceeds 30mA, it is prohibited to use ordinary electric detonators. 6.5.2 When there are live facilities such as transmission lines, transformers, and high-voltage electrical switches near the demolition object, special instruments must be used to detect the induced current. When the induced current value exceeds 30mA, it is prohibited to use ordinary electric detonators. 6.5.3 In order to prevent the induced current from causing accidental explosion in the detonation network, the following measures should be taken: a. When there are transmission lines near the electric explosion network, ordinary electric detonators must not be used; otherwise, simulation tests must be conducted with ordinary electric detonator ignition heads,
b. Try to reduce the closed area of ??the electric explosion network conductor coil as much as possible; the distance between the two main wires of the electric explosion network shall not be greater than 15cmc.
d. Use non-electric detonation.
6.5.4 When there are radio frequency sources such as radio transmitters, transmitters, TV stations, microwave relay stations, and directional radar transmitting antennas near the demolition objects, their type, power, operating frequency, orientation and distance blast must be investigated. area distance. 6.5.5 In order to prevent accidental explosion of radio frequency electricity on the electric explosion network, the following regulations must be complied with: the safe distance between the explosion area and the radio frequency source should comply with the provisions of Appendix A, a.
Use electricity in the explosion area The ignition head replaces the electric detonator to conduct live explosion network simulation tests to detect the impact of radio frequency electricity on the electric explosion network; b.
prohibits mobile radio frequency sources from entering the work site. For radio frequency sources that have entered and cannot be evacuated, the work should be suspended before charging begins; c.
The wireless telephone used on site should use the ultra-high frequency band transmitting frequency; d.
The network should Pave it straight and close to the ground to minimize the closed area of ??the conductor coil; e.
The main line of the network should be double-stranded conductors or single-stranded wires that are parallel to each other and close to each other; f.
network The circuit conductors and lightning tube pins are not allowed to come into contact with any antenna, and one end is not allowed to be grounded. g
6.5.6 During demolition and blasting operations, special personnel must be designated to collect weather forecast data and macroscopically observe weather changes. Avoid charging blasting under severe weather conditions such as thunder and lightning, strong winds, heavy rain, and heavy snow. GB13533—92
6.5.7 When carrying out demolition blasting during thunderstorm season, the following regulations should be observed: a.
Non-electric detonation is used:
When electric explosion is used, it should be set up in the blasting area Lightning protection or early warning system; b.
Temporarily cut off: all conductors (wires or metal pipes) leading to the explosion area; c.
d.
Buried main line of electric explosion network 25cm into the ground, and lay bare wires consistent with the main line on the ground, with both ends inserted 50cm into the ground. 6.5.8 When there are signs or warnings of lightning coming during the charging and wiring process, the following regulations must be followed: a
b.
Immediately dismantle the main and branch lines of the electric explosion network and expose them. The core wires should be tied with tape and insulated from the ground. All personnel in the explosion area should evacuate the dangerous area quickly. 6.5.9 When carrying out demolition blasting in dry and windy seasons, the following regulations should be observed: a. The warning range for individual flying objects in the downwind direction is increased by 50% to 100%; b. Sprinkle water on the surface of the demolished object and the nearby ground. 6.6 Monitoring of blasting earthquakes and shock waves
6.6.1 When demolition blasting is carried out near special buildings (structures) or in areas with complex blasting conditions, necessary blasting earthquake and shock wave monitoring should be carried out to ensure that the protected objects safety. 6.6.2 Blasting earthquake and shock wave monitoring should comply with the following regulations: a. Determine the safety protection requirements for blasting earthquakes and shock waves of objects to be protected; the safety of blasting earthquakes and shock waves for target objects that require special protection should be studied and determined by experts and reported to the local public security department for filing; b. The test system used for monitoring should be dynamically calibrated indoors and have good frequency response characteristics and linear range, and the data error should meet the engineering requirements;
The content of the monitoring report should include: monitoring method, distance between each monitoring point and the explosion area , measured vibration velocity, main vibration phase vibration frequency and vibration duration c
time, instrument frequency range, measured shock wave sound pressure intensity (overpressure) value, shock wave action duration, macroscopic investigation before and after the protected object is blasted situation and a clear conclusion on the impact of blasting vibrations and shock waves on protected objects. 7 Construction Preparation and Construction
7.1 Construction Announcement
7.1.1 After the Public Security Bureau (or Office) has reviewed and approved the demolition blasting design, Party A and Party B shall jointly post a construction announcement in the working area. 7.1.2 The content of the construction announcement should include: project name, engineering design unit, construction unit and cooperating unit, project leader, operation deadline, etc.
7.1.3 With the assistance of the local public security department and government, a blasting announcement was issued to units and residents near the blasting area a few days before the blasting. The content of the announcement should include: blasting location, number of blasts, time of each blast, warning range, warning signs, various signals and their meanings, as well as relevant precautions such as the method and time of sending signals, safety measures, etc. 7.2 Construction site cleaning and preparation
7.2.1 Before blasting operations, the construction site and other projects should be cleaned, demolition work unrelated to blasting operations should be completed, the location of drilling operation machines and tools should be reasonably arranged, and temporary on-site explosive bags should be prepared. Place and production site. 7.2.2 In the blasting operation area, clear work scope signs must be set up and warning personnel must be arranged. Set up protective barriers near traffic arteries and pedestrian walkways.
7.2.3 Workers entering the blasting operation site must wear chest tags or arm tags; blasters should carry the "Blasting Operation Permit" with them. 7.2.4 During construction operations, personnel not related to blasting operations are strictly prohibited from entering the site. 7.3 Construction and acceptance
7.3.1 Blasting drilling construction should be carried out strictly in accordance with the demolition blasting design. If there are any discrepancies with the design, they must be marked on site and reported to the blasting leader in a timely manner.
7.3.2 Drilling and charging operations shall not be carried out at the same time. 559
GB 1353392
7.3.3 Before charging, on-site engineering and technical personnel should inspect and accept the blast holes one by one, and register the number. Indicate the number and size of lots (locations). Special explanations should be given to blast holes that do not meet the design requirements and will be handled by the designer. 7.3.4 Demolition blasting designers should participate in checking and accepting the construction quality. 7.4 Charging and detonation network
7.4.1 The production of explosive packages must be carried out in a selected safe place. Each explosive package should be accurately weighed according to the requirements of the blasting design, and classified and grouped according to the weight of the explosive package, the detonator section, and the number of explosive packages. A dedicated person is responsible for registration and strict collection procedures. 7.4.2 Fireworks are strictly prohibited at the charging site. During the charging process, a dedicated person should be assigned to supervise and inspect. 7.4.3 For explosive packages that need to be waterproof, waterproof treatment should be carried out during the processing and production of the explosive packages, or waterproof explosives should be used. 7.4.4 The charging personnel should charge the explosives strictly according to the designed amount of explosives for blasting, and fill them with the original gun sticks and prepared gun mud. Pay attention to the filling quality, and it is strictly forbidden to use iron needles for filling.
7.4.5 A dedicated person should be responsible for connecting each section and the blasting network between them, and check the network parameters after connection. 7.4.6 Strictly carry out protection and covering according to the blasting design to ensure that individual flying stones are controlled within the designed safety range. After the protection and covering work is completed, the detonation network must be rechecked, and the detonation device can only be connected after verification. 8 Organization before detonation
8.1 Organization and command system
8.1.1 For demolition blasting projects, an on-site command center should be set up. The organization and command system should adapt to the scale of the demolition building (structure) project, the complexity of environmental conditions and the requirements of the blasting operation procedures. It should be carried out strictly in accordance with the design and construction organization plan to ensure the safety of the project. 8.1.2 The command center should set up functional groups such as blasting technology, safety warning, personnel evacuation, safety monitoring and emergency rescue according to the project level and construction conditions. The establishment of functional groups and their scope of responsibilities shall be determined by the commander. Each functional group shall work under the unified leadership of the commander. 8.2 Warning during charging
8.2.1 The warning range during charging shall be determined by the command center based on the design and environmental characteristics. 8.2.2 When charging operations begin, all irrelevant personnel are prohibited from entering the blasting site, and warning signs shall be set up around the demolished buildings (structures).
8.3 Warning scope and methods
8.3.1 Obvious warning signs should be set up at the boundary of the blasting danger zone. 8.3.2 Personnel must be on guard at all passages leading into the blasting area and at the entrance to the danger zone. The guards should hold warning flags, sirens or portable loudspeakers.
8.3.3 The warning scope should be determined by the design based on the characteristics of the demolished building (structure), protection requirements and environmental complexity. 8.3.4 The blasting design must provide a plan of the warning scope. The map should indicate the danger map, the location of the warning points and warning signs, and conduct actual surveys according to the design requirements to further verify the locations of the warning points and warning signs to ensure that all passages can be closed. 8.3.5 The guards should be on duty at the designated location at least half an hour before detonation, and cut off all passages leading to or passing through the blasting point according to the plan. They are not allowed to leave the warning post until the alarm release signal is issued. Personnel who are on guard duty are not allowed to do other things at their posts. 8.3.6 If a blind shot or unstable structure is found after blasting, warning and danger signs should be set up on site before any treatment is carried out. 8.4 Communication
8.4.1 During the blasting construction, the command center should establish communication with the blasting construction site, detonation station, and various guard points. 8.4.2 The commander-in-chief shall determine the communication system and contact method, and call each other according to the procedure. 8.4.3 Communication can be equipped with wired telephones or portable walkie-talkies. 8.5 Evacuation
8.5.1 Personnel within the blasting danger range must evacuate to a safe place before detonation according to the evacuation plan of the command center. 8.5.2 The evacuation work should be specifically responsible for the personnel evacuation team under the leadership of the commander-in-chief. When demolition blasting is carried out in a busy downtown area, local public security officers or security personnel should cooperate. 8.5.3 The evacuation personnel shall be responsible for different areas and each shall evacuate the personnel in their respective areas to a safe place. Each guard shall promptly report the situation of the guard work to the commander-in-chief.
GB13533--92
8.5.4 The personnel responsible for the evacuation of personnel shall promptly report to the commander-in-chief after completing the evacuation task. The commander-in-chief shall issue the detonation order only after confirming that all personnel have evacuated the dangerous area. 8.5.5 After the personnel have evacuated, no one shall be allowed to enter the blasting warning area before the lifting of the warning signal is issued. 9 Detonation
9.1 Detonation method
9.1.1 For demolition blasting, electric detonators or detonating cords shall be used for detonation. It is strictly forbidden to use the fuse detonation method for detonation. 9.1.2 For demolition blasting, electric blasting network or compound detonating cord detonation network shall be used. 9.1.3 When using electric detonators for blasting, the intensity of stray current and radio frequency electricity in the blasting area must be tested. If the current intensity exceeds the safe allowable value, it is prohibited to use ordinary electric detonators for blasting. 9.2 Detonation station
9.2.7 Detonation stations must be set up for demolition blasting of important buildings (structures). 9.2.2 Electric blasting stations must be equipped with:
a.
Current value.
Special power supply, lighting power supply or detonator. The capacity of the power supply must meet the quasi-explosion requirements of each electric detonator in the blasting network. b.
Special instrument for explosive network detection.
Detonation switch installed in a special detonation box. c.
Electrician tools and alarm devices.
d.
9.2.3 The detonation station should be located in a safe place and have the function of avoiding artillery fire. 9.3 Detonation power supply
9.3.1 The capacity of the detonation power supply must meet the requirements of the blasting network. 9.3.2 When using a detonator for detonation, the function of the detonator should be checked before detonation to ensure the reliability of detonation. 9.4 Person in charge of detonation
9.4.1 The person in charge of detonation is fully responsible for the detonation work under the leadership of the commander. His specific duties are: a:
b.
Responsible for supervising and inspecting the quality of the blasting network laid by the blasters; responsible for the detection, verification and correction of the total resistance of the blasting network; keeping the keys of the detonation switch box and the detonator, and not giving them to others; c.
d.
Has the right to stop irrelevant personnel from entering the station;
e.
Responsible for checking all preparations before detonation. 9.5 Notification and Signals
9.5.1 Three days before the detonation, the local government and public security department shall be notified in written form, and all residents near the blasting area shall be informed in writing so that they know the detonation time, warning range, warning signs and the meaning of sound signals, as well as the method and time of sending signals. Timely organize the evacuation of personnel and the relocation of equipment.
9.5.2 During the blasting, sound signals and visual signals must be sent at the same time so that the personnel in the danger zone can hear and see them clearly. The first signal is the advance signal. All personnel not related to the blasting shall immediately evacuate outside the danger zone or to a designated safe place. A sentry post shall be set up at the entrance to the danger zone. The second signal is the detonation signal. The detonation signal shall be issued only after it is confirmed that all personnel and equipment have evacuated the danger zone and the conditions for safe detonation are met. Detonation is allowed according to the detonation signal. The third signal is the release of warning signal. The release of warning signal shall be issued only after the inspection personnel have checked and confirmed that it is safe. Before the signal to lift the alert is issued, the personnel responsible for the alert should stick to their posts. No one is allowed to enter the danger zone except the inspectors approved by the leader of the blasting work.
9.6 Detonation
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9.6.1 The commander shall inspect all the work before detonation and confirm that it meets the requirements before issuing the detonation order. 9.6.2 The detonation command should adopt the countdown method. 10 Post-blasting inspection
10.1 Safety inspection and handling
10.1.1 After the blast, the inspectors must wait until the building (structure) collapses and stabilizes before entering the site for inspection. 10.1.2 When a local area that has not collapsed and stabilized is found, the person in charge of the blasting should immediately demarcate the safety range and assign special personnel to guard it. Unrelated personnel are not allowed to approach.
10.1.3 When a blind shot or a part that has not collapsed and stabilized is found, a handling plan should be immediately formulated and a special person should be assigned to handle it. 10.1.4 If any residual explosive materials are found during the inspection, a dedicated person shall be responsible for finding and handling them during the subsequent removal of blasting slag. 10.2 Handling of blind shells
10.2.1 It is strictly forbidden to pull out the electric detonator leg wire or detonating tube from a blind shell. 10.2.2 When handling a blind shell, measures shall be taken to eliminate unsafe factors caused by changes in blasting conditions. Only after all personnel have evacuated to a safe area can a second detonation be carried out according to conventional detonation requirements. 10.2.5 Unexploded explosives and residual detonators collected from blind shells shall be promptly handled and destroyed with the consent of the commander-in-chief. The location, amount of explosives and the current condition of each blind shell shall be recorded one by one, filed after the commander-in-chief signs, and filed with the public security bureau. 10.3 Lifting of alert
10.3.1 The person in charge of blasting shall enter the site for inspection after the explosion, submit a formal report to the commander-in-chief after confirming safety, and sign the report record.
10.3.3. The commander can issue an order to lift the alert only after receiving the report and confirming safety. 562
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Appendix A
Safe distance between explosion area and radio frequency power supply (reference part)
Explosion area and medium and long wave radio stations ( AN) safety distance should comply with the provisions of Table A1. A1
Table A1
Launching station output power (W)
5～25
2550
50~～100
100~ 250
250~500
500~1000
1 000~2 500
2 500~5 000
5 000~10 000||tt ||10 000~~25 000
25 000~50 000
50000100000
The safe distance between the A2 explosion area and the mobile frequency modulation (FM) transmitter should comply with Table A2 Regulation. Table A2
Transmission power (W)
1～10
10~30
30~60
60~250
250 ~600
Safe distance (m)
30
45
67
106
136
198|| tt||305
455
670.
1060
1520
2130
safety distance (mi)
1.5
3.0
4.5
9.0
13.0
3 explosion zone and very high frequency (VHF) television transmitter frequency modulation (FM) transmitter The safety distance should comply with the provisions of Table A3. A3
Table A3
Transmission power (W)
1~10
10~100
100~1000
1 000~ 10 000 | | tt | | 10 000 ~ -100 000 | | tt | | 1000001000000 | A4
safety distance (m)
1.5
6.0
18.0
60.0
182.0
609.0||tt ||563
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