[Civil Engineering Edition] Daily Question – 20180319

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A decoration company undertook the interior and exterior decoration work for a shopping mall. The structure of the building is of frame type, with six above-ground floors and one underground floor. The construction tasks include the construction of retaining walls, plastering, light steel stud gypsum board ceilings, tile flooring, doors and windows, painting, wood finishing, curtain walls, etc. On the construction site layout plan, the following are marked: 1. Material storage area ； 　　2. Construction area and semi-finished product processing area ； 　　3. Storage areas for various fire-fighting equipment ； 　　4. Traffic roads and safety corridors within the site (with clear markings) ； 　　5. Area for placing main distribution boxes and switch boxes ； 　　6. On-site construction office, security guard ； 　　7. Placement areas for various construction machinery. 　　To transport construction materials, a winch is installed outdoors. Upon inspection, it was found that the operator of the winch was absent; instead, a worker was operating the machinery to transport a worker and a cartload of sand upstairs. The construction crew piled some construction materials, such as cement and finishing tiles, along the fire lane on site. The width of this fire lane is 2 meters, allowing pedestrian passage ； For temporary power supply, a three-level power distribution and two-level protection system is employed, along with residual current circuit breakers. Sectional protection is also implemented. The distribution boxes used for normal power supply are left unlocked. The voltage for temporary on-site lighting is 220V. Meanwhile, an operator welding the framework of a glass curtain wall on an outdoor scaffold had neither a fire permit nor a work permit ； The saw currently in use at the wooden door processing workshop has no guard. 　　Inside, there is an escalator that has not yet been installed; no protective measures are seen around the预留 hole. Inside a room on the third floor, workers were laying ceramic tiles; the scene was dimly lit. Workers placed the bulb of an iodine-tungsten lamp on the completed ceiling joists for illumination ； Meanwhile, an operator welding the framework of a glass curtain wall on an outdoor scaffold had neither a fire permit nor a work permit ； The saw currently in use at the wooden door processing workshop has no protective measures. 　　Question:
(1) Based on the characteristics of the project, are there any missing items in the construction site layout plan? Please add them. 　　(2) Based on the above description, what problems does the construction unit have regarding on-site work safety? (1) The layout plan of the construction site has the following omissions: ① Storage area for flammable and explosive materials ； 　　②Construction waste storage area ； 　　③Temporary water piping. 　　(2) The construction unit has the following problems regarding on-site work safety: ① It violated the safety regulation that prohibits using cargo winches to transport people up and down. 　　②In case of any violations, the winch should be operated by personnel who have received specialized training and certification. 　　③No materials shall be stacked in the fire lane, and its width shall be 3.5 meters. 　　④The distribution box for temporary power supply must be locked during normal use. 　　⑤The lighting voltage for temporary construction power supply is 36V. Tungsten-iodine lamps must not be used, nor placed on the suspended ceiling joists, to prevent electric shocks and injuries to construction workers. 　　⑥Guardrails must be erected around any holes left open for construction purposes, and the openings must be sealed with safety nets. 　　⑦Electric and gas welding personnel must undergo specialized training and obtain certificates before they can work. Before performing any work, a fire permit must be obtained, and fire watch personnel as well as fire-fighting equipment must be provided. 　　⑧Chain saws used in construction must be equipped with guards to prevent any accidental injuries to the operator.