1 : Check the well for hazardous gases and unsafe factors before starting daily work. When the hole depth is greater than 10m and the humus soil layer is thick, there should be special air supply equipment, and the air volume should not be less than 25L/s, into the pile hole. Give fresh air to the job. After blasting under the pile hole, air must be blown into the pile hole, or water must be sprayed evenly into the pile hole, so that all the gun smoke can be removed or after it has coalesced and settled before the operation in the pile hole can be carried out. When the soil in the pile hole contains more harmful gases and organic substances, in addition to strengthening the ventilation, the monitoring of harmful gases should also be strengthened.

   2 : The pile hole should be strictly managed. The pile hole should be set with a guard plate 200mm higher than the ground to prevent ground stones or other debris from being kicked into the pile. There must be guardrails around the ground hole and the height is not less than 800mm. Irrelevant personnel are not allowed to approach the pile orifice, and the mechanical operator of the pile orifice is not allowed to leave their posts. No items (such as keys, pens, pocket watches, lighters, small tools, toys, etc.) should be placed in the pocket to prevent falling into the manhole.

   3 : Workers under the pile hole must wear safety helmets. Wear insulating rubber shoes, and there should be reliable communication facilities between the pile hole and the lower operator. If the pile hole management is chaotic, operations in the pile hole should be stopped immediately and returned to the ground. The operators of the ground hole must wait for the underground operators to come up before leaving their posts.

   4 : Use conventional methods (including the method of first sealing the bottom) to pour the concrete of the pile body. The upper mouth of the pile hole must be sealed (only the funnel mouth is left), and the maximum gap should not exceed 3m. The sealing plate and square timber should have sufficient strength to ensure the lower part Operator safety. The string tube should be reinforced with No. 8 galvanized steel wire, and the lower mouth of the string tube should be temporarily tightened to prevent the string tube from swinging and hurting people. After sealing, it should be strengthened to supply air to the pile hole, or a vent with a height greater than 1m should be preset on the pile hole sealing platform.

   5 : Hanging soft ladders should be installed at the openings of the pile holes and lengthened with the depth of the pile holes, so that the relevant personnel can go up and down smoothly in case of accidents. Under normal circumstances, the operator should ride a hanging basket or a special bucket up and down. The start-up personnel should be assigned to a special plane and hold a certificate to work, concentrate their thoughts and pay attention to all the dynamics in the pile hole, and the electrical switch must not be left. The hook should have a spring-type decoupling device to prevent vicious accidents such as bucket flipping, basket flipping, and decoupling. It is strictly forbidden to stand on the edge of the slag bucket. Vertical transportation machines and devices must be equipped with automatic clamping safety devices.

   6 : The slag bucket, hanging basket, and bucket are lifted up and down with an electric hoist, and the top and bottom should be aligned with the center of the pile hole.

   7 : Under any circumstances, it is strictly forbidden to overload the lifting equipment. The lifting frame and track should be inspected before going on and off work. If abnormal conditions are found during work, stop working immediately, find out the reason, and carefully inspect and repair, and operation with diseases is not allowed.

   8 : When lifting the reinforced manhole, it should be fastened tightly (the lower mouth should be held by an iron plate) to ensure that it does not slip off and fall. After the steel bar is hoisted to the bottom of the manhole, people can enter the pile hole and unhook.

   9 : When tying the steel frame in the pile hole, the square timber of the operating platform must be placed on the solid place (it can be placed on the protruding surface of the concrete wall or on the reinforced ring reinforcement of the steel frame) and nailed to the platform wooden board to prevent the sliding displacement of the square timber. The platform fell.

   10 : Safety miner's lamp or 12V low voltage power supply should be used for lighting under the pile hole. All electrical appliances and electrical equipment entering the pile hole should be grounded, and the wires must be insulated. Do not rub against any hard objects when pulling the wire. Electrical switches should be concentrated in the pile holes, and a leakage protector should be installed to prevent leakage and electric shock accidents. Once a leakage is found, the switch must be quickly turned off. The electrician on duty must strengthen inspection and maintenance of all electrical equipment and wiring, and find problems in time, and properly deal with.

   11 : The pumping pipes, ventilation pipes, wires, etc. in the pile holes should be properly treated and temporarily fixed. Generally, they should be laid along the wall to prevent the slag bucket and hanging basket (bucket) from hanging up or breaking when going up and down, causing accidents .

   12 : The soil and slag discharged from the pile hole should be transported away in time, and should not be piled around the hole. If it needs to be temporarily stacked, it should be 5m away from the hole and should not be piled up too much to prevent the hole from collapsing.

   13 : When the boulder or bedrock is treated by blasting in the pile hole, it should be operated by a skilled worker who has obtained a blasting operation certificate. The intermittent time after blasting shall not be less than 45min. After inspection, it is confirmed that there are no loose stones or soil blocks on the wall of the pile hole. The pile hole can only be operated after the wall is intact.

   14 : The gap between the hole formation period and the hole should be covered after concrete pouring.