Weak current College】 【external use elevator, dual-use goods elevator safety supervision control points.

External elevators refers to construction in the vertical transportation, transportation of materials and personnel of dual-use goods, due to the often attached to the elevator in the building, therefore, also known as external use elevator.

(A) safety devices
1. the brake. Due to human cargo elevator construction often run up and down, its a manned the reliability has a direct bearing on the lives and safety of construction workers. Brake is to guarantee the safety of the main elevator safety device, because the lift starting, stopping, frequent and job conditions changes, brake easy failure, ladder cage decline resulted in an accident, should strengthen maintenance, keep the automatic adjustment of clearance agencies clean, always timely repairs found. Safety check should act test validation.
2. a speed limiter. Fall speed limiter is lift device, the elevator in each inspection due after installation, you should also test for fall. Will the ladder cage lift height above the ground, relax 4m brake rigging fall to ladder cage free landing, braking distance not greater than 1 ~ 1.5m, confirm the braking effect is good. Then rise ladder cage 20cm, relax friction cone centrifugal block (the above test press run of no-load and rated load). According to the requirements of speed limiter calibration every two years (to specify the unit calibration), security checks, you should check the results of the calibration date and time.
3. door interlock device. Door interlocks are to ensure that the ladder cage door is closed tightly, ladder cage can be of safety devices. When the ladder cage doors didn't close tight in accordance with the regulations, the ladder cage cannot be put into operation, to ensure that the lift cage. Safety check should act test validation.
4. the upper and lower-bit device. Confirm that the ladder cage at run time, the ultimate limit position and on the lower limit limit position properly and equipment for sensitive and reliable. Safety check should act test validation.

(Ii) security and protection
1. lift ofelectric around 2.5m range must set strong protective railing, import and export Department of upper erection sufficient size of protective canopy (by falling radius requirements).
2. protective canopy must have protective ability of the body combat, available 5cm plank or equivalent 5cm plank strength of other materials.
3. lift and various stations across the bridge and transport channels, in addition to the two sides should be in the protective bar and retaining road skirting and vertical NET closed, import and export Department was set up on the door closed. Door in the ladder cage runtime is turned off, when the ladder cage which run to the station, it may open the door of the station.
4. door structure must be safe and reliable are normally closed, normally all is turned off, you cannot make the door all open forms in name only.
5. each station run channel or platform, you must use 5cm plank floor flat solid, no use of bamboo and thickness of plate, sheet and plate should be fixed, running along a ladder cage side local boards are not allowed out of the phenomenon.

(3) drivers
1. in the case of external use elevator drivers, special operations personnel should be formal training exam and get a certificate of competency.
2. lift the first job in each class, you should check before the test the limiters, ladder cage door etc of interlocking device is good, each platform entrance is closed, and run the test and measurement of empty elevator brake efficiency.
Elevators in each class the first time load at run time, you must rise from the lowest level, no top-down. When the ladder cage 1m height from the ground up, to test the reliability of the parking brake.
3. multi class job of elevator drivers should be changed in accordance with the regulations, and fill shift records.

(4) load
1. as a result of external use elevator General are not equipped with overload limit device, so the construction site use to have the obvious signs of manned or contents made clear limits contained provisions requiring construction personnel together with the drivers, and asked the driver observed every time before starting to check to confirm compliance with the requirements before they can run.
2. "no load" to be
Mostly for the original design have on the weight of the elevator. When the elevator in the install or uninstall process, often appear to have been dismantled and ladder cage is still running, ladder cage of brake torque increases greatly, if still in the normal use of the contents of manned, easily lead to accidents. Some elevator statement provides a 50% to shedding; run only contain 1 ~ 2 persons exposed workers and the dismantling of the parts. No heavy lift consequential increase of load, time length easily overheat. To prevent brake failure, ladder cage should be used to move the slide in each slide in a standard parking section. Lift the original design is not heavy, not subject to this restriction.

(5) the installation and removal
1. before you install or remove from the competent authorities in accordance with the specification requirements in conjunction with the construction site of the actual situation develop detailed work programmes and to track job prior to all staff to give the low-down and specify the care personnel.
2. in accordance with the provisions of the Ministry of construction, installation and removal of the workers, should be made by a professional team and the relevant departments of the municipality issued by the certification of staff, and a special command.
(Vi) acceptance
1. lift installation should be required for acceptance, including: production, based on the shelf of verticality, with wall distance, top free height, electrical and safety device sensitivity check test results, and doing without load and rated load test run to verify.
2. the factual record inspection results and problems to set correct results confirm that the elevator eachtarget conforms to the requirements.

(VII) the shelf stable
1. the rail rack at install time, using Theodolites for lift in both directions for measurement and calibration. Its vertical deviation shall not exceed ten thousandths, or follow the instructions provided.
2. rail rack top free height, Rails framework and building distance, mural the vertical distance between the plane and the lowest point with wall rack height above the ground shall not exceed the specifications.
3. additional wall rack must follow construction plans and architectural structure to connect, and buildings require strength requirements, non-attached wall rack and scaffolding to connect.
(8) contact signal
1. lift the job should signal the driver in accordance with the given commandSignal action, before the Bell signal must be humming.
2. signal command staff and drivers should closely, do not allow each worker casually percussion guide frame to contact confusion.

(9) electrical safety
1. the elevator should be separately installed distribution box, and press the provisions protecting zero (ground), repeat the grounding and leakage protection devices installed. Installation of an elevator in the shade or night job in the elevator, you must install the full itinerary sufficient lighting and obvious layer station number sign luminaires.
2. electrical appliances should lift by certified management is responsible for checking the maintenance of debugging and logging.

(10) lightning
See material hoist "lightning" check item.