Abstract: Disclosed is a low-cost and safe method for repairing and reinforcing underwater piers of bridges in tidal zones, including: installing a steel boxed cofferdam and reinforcing concrete of a pier column, where during the step of installing the steel boxed cofferdam, a lower internal bracing is first fixed onto a top surface of a pile cap, then side plates of the steel boxed cofferdam are connected to the lower internal bracing, and subsequently, hydraulic jacks are used to push a waterstop work platform; and during the step of reinforcing the concrete of the pier column, spacers are arranged between an inner surface of glass fiber reinforced plastic formwork and an outer surface of the pier column, a bottom outer edge of the glass fiber reinforced plastic formwork is sealed with mortar, and once the mortar reaches a certain strength, reactive powder concrete is placed.

Abstract: Disclosed is a mounting method for a sea outfall pipeline in a shallow section, including a preparation process and a construction process. The preparation process includes a pipeline pre-submergence preparation step and a pontoon apparatus positioning step. At the pipeline pre-submergence preparation step, a female flange and a male flange are welded in one-to-one correspondence at two ends of a pipeline section, blind flanges are fixed to outer ends of the female flange and the male flange respectively. At the pontoon apparatus positioning step, from front to back, a first pontoon apparatus to a fourth pontoon apparatus are sequentially anchored and positioned at a certain spacing, the first pontoon apparatus and the fourth pontoon apparatus are used in one-to-one correspondence for dismounting the blind flanges at the two ends of the pipeline section, the second pontoon apparatus and the third pontoon apparatus are used for mounting the pipeline section.

Abstract: A construction method for removing mud in a jacket steel pipe pile includes: erecting a piling auxiliary platform, and performing underwater steel pipe pile sinking; measuring an elevation of a mud surface in the underwater steel pipe pile, and calculating a height from the mud surface in the pile to a pile top and a needed mud removing depth according to the measurement result; installing mud removing equipment on the steel pipe pile; starting the mud removing equipment to carry out mud removing operation, and in a case that the mud removing depth is reached, pausing the mud removing equipment, and cleaning an inner wall of the steel pipe pile; and in a case that the mud removing operation is not reach the related elevation, repeating the mud removing operation till the mud removing operation reaches a standard.

Abstract: An anti-corrosion material and anti-corrosion method for submerged floating tunnel pipe section concrete is provided. The anti-corrosion material includes: a base layer material, a middle layer material and a surface layer material. The base layer material is an organosilicon material. The middle layer material is high-strength and high-durability fiberglass reinforced plastic. The surface layer material is a hydrophobic material. The anti-corrosion method includes: preparing fiberglass reinforced plastic; cleaning a surface of a submerged floating tunnel pipe section concrete material, preparing an organosilicon material, and coating the organosilicon material onto the surface of the pipe section concrete material; and preparing a hydrophobic material, and spray-coating the hydrophobic material onto a surface of the fiberglass reinforced plastic.

Abstract: A construction method for removing mud in a jacket steel pipe pile includes: erecting a piling auxiliary platform, and performing underwater steel pipe pile sinking; measuring an elevation of a mud surface in the underwater steel pipe pile, and calculating a height from the mud surface in the pile to a pile top and a needed mud removing depth according to the measurement result; installing mud removing equipment on the steel pipe pile; starting the mud removing equipment to carry out mud removing operation, and in a case that the mud removing depth is reached, pausing the mud removing equipment, and cleaning an inner wall of the steel pipe pile; and in a case that the mud removing operation is not reach the related elevation, repeating the mud removing operation till the mud removing operation reaches a standard.