Special scheme for safety protection channel under

Special scheme for safety protection channel under the bridge

identification and evaluation of major hazard sources

there are major hazard sources of falling from height or object strike in the gap between T-beams and the edge of bridge deck from the erection of T-beams of pengwu and Longqiao viaducts in this contract section to the completion of bridge deck pavement

main countermeasures (see the table below)

sequence of hazard source control measures

eliminate hidden dangers, so that there are no hidden dangers in the equipment and working environment. Achieve intrinsic safety, making it impossible for employees. 7 Jinan new era Gold Testing Instrument Co., Ltd. is a large manufacturer of experimental machines The oil pump plunger is rusted and exposed to hidden dangers. Or consider whether the following equipment can be used to reduce. If there is an error in the pressure testing machine, it will seriously affect the measurement results. If it is serious, it will bring a certain economic loss, so eliminating the error of the pressure testing machine cannot but attract everyone's attention It is worth mentioning that the error of the pressure testing machine is mainly caused by the incorrect installation or friction of the pressure testing machine. Therefore, measures should be taken to eliminate the error mainly in these two aspects Here is a method to eliminate the error of pressure testing machine Risk: conventional ventilation or forced ventilation, protective fence, cover, isolation (mechanical, electrical), lighting, enclosure

limit the number of people exposed to risks; Control contact time: carry out dangerous work at low activity frequency stages, such as weekends and evenings; Design workplace; Work rotation and shift change

it is used to specify the safe work system and reduce risks, such as work permit, checklist, operation manual, operation scheme, risk assessment method, work safety analysis, process diagram, etc

main control measures

it can be seen from the above table that item 4 is the main measure, and item 6 should be used as auxiliary control measures. That is, barriers are used to isolate hazard sources from operators, and procedural measures are used to strengthen daily management

the barrier in this project mainly refers to the setting of safety shelters under the bridge. Procedural measures refer to daily management measures, such as safety education and training, troubleshooting and treatment of hidden dangers, etc

2 construction scheme

2.1 main quantities

⑴ safety materials shall be prepared according to the length of the intersection between the bridge and the existing road below, and protection shall be carried out according to the site. The main contents are as follows:

① the 6th span on the right side of pengwu viaduct is 24 meters long, the column is 6 meters high, and the circumferential spacing is 1.5 meters

② the fifth span on the left side of pengwu viaduct is 18 meters long, the column is 6 meters high, and the circumferential spacing is 1.5 meters

③ the No. 7 pier on the left and right sides of Longqiao viaduct is 30 meters long, the column is 6 meters high, and the circumferential spacing is 1.5 meters

④ the fifth span (relocated Road) on the right side of pengwu viaduct is 18 meters long, the column is 6 meters high, and the circumferential spacing is 1.5 meters

above 90 meters in total

⑵ protection realizes the main business income of 1.46 billion yuan form

① two sides, three horizontal railings on each side, the column height is 6 meters, and the circumferential spacing is 1.5 meters

② ceiling: fully paved with bamboo plywood

③ connection: a diagonal rod is set on the left and right of each pipe support for stability

2.2 see the attached table for details of the bill of quantities

2.3 construction method

⑴ the steel pipe guardrail of the safety protection shed is extended with pipe buckles, and the cross fastener is used to connect the guardrail and the column

⑵ bamboo plywood is paved on the top of the safety protection shed

⑶ safety fall protection is set on the top and both sides of the safety protection shed

3 special safety measures

3.1 the construction must be carried out according to the construction scheme and construction specifications

3.2 strictly follow the operating procedures in all operation processes

3.3 construction preparation

3.3.1 inspection before commencement: whether all kinds of mechanical equipment are in good condition

3.3.2 safety protection inspection: check whether warning signs, signboards, speed limit signs, etc. are complete

4 preparation measures for emergency treatment of safety accidents

4.1 common safety accidents

falling from height (operators do not use safety belts or the frame is unstable), vehicle injury (transportation vehicles are overloaded, overspeed, poor vision, and do not whistle), object strike (objects falling above the bridge), etc

4.2 preparatory measures for emergency handling of safety accidents

for common safety accidents of the project, the management department has formulated special emergency plans. Once a safety accident occurs, it shall be reported to the emergency leading group of the management department immediately, and the emergency group must immediately start the corresponding plan