Abstract: A method for constructing a steel sheet pile cofferdam is provided, including: step S1, determining a construction area of the steel sheet pile cofferdam; step S2, piling steel casings, and welding guide frame brackets to the steel casings, the guide frame brackets are connected with a guide frame and limiting clamp plates; step S3, piling steel sheet piles by relying on the guide frame; step S4, pouring subsealing concrete at a bottom of the steel sheet pile cofferdam; step S5, arranging purlins and internal supports within the steel sheet pile cofferdam; step S6, perform a secondary subsealing at the bottom of the steel sheet pile cofferdam; step S7, pumping water within the steel sheet pile cofferdam through a pump and pouring to form a bearing platform on the subsealing concrete; step S8, removing the steel sheet pile cofferdam after the bearing platform is formed.

Abstract: A method for constructing a steel sheet pile cofferdam is provided, including: step S1, determining a construction area of the steel sheet pile cofferdam; step S2, piling steel casings, and welding guide frame brackets to the steel casings, the guide frame brackets are connected with a guide frame and limiting clamp plates; step S3, piling steel sheet piles by relying on the guide frame; step S4, pouring subsealing concrete at a bottom of the steel sheet pile cofferdam; step S5, arranging purlins and internal supports within the steel sheet pile cofferdam; step S6, perform a secondary subsealing at the bottom of the steel sheet pile cofferdam; step S7, pumping water within the steel sheet pile cofferdam through a pump and pouring to form a bearing platform on the subsealing concrete; step S8, removing the steel sheet pile cofferdam after the bearing platform is formed.

Abstract: The present invention discloses a halogen-free insulated cable material used for 125° C. irradiation cross-linked EPCV photovoltaics and a preparation method thereof. The material is mainly prepared from the following raw materials based on weight parts: 5-20 parts of ethylene propylene diene monomer; 0-25 parts of polyethylene; 0-10 parts of ethylene-vinyl acetate copolymer; 1-5 parts of compatibilizer; 50-75 parts of aluminum hydroxide; 1-5 parts of stabilizer; 1-5 parts of silicone masterbatch. The halogen-free insulated cable material of the present invention has excellent insulating property and flame retardancy, and can achieve the halogen-free flame retardant VW-1, and releases a very low amount of smoke when burning, making a light transmittance of greater than 90% in the smoke, and also has excellent mechanical properties and electrical properties, and can suffer capacitance change rate test at 90° C.

Abstract: The present invention discloses a halogen-free insulated cable material used for 125° C. irradiation cross-linked EPCV photovoltaics and a preparation method thereof. The material is mainly prepared from the following raw materials based on weight parts: 5-20 parts of ethylene propylene diene monomer; 0-25 parts of polyethylene; 0-10 parts of ethylene-vinyl acetate copolymer; 1-5 parts of compatibilizer; 50-75 parts of aluminum hydroxide; 1-5 parts of stabilizer; 1-5 parts of silicone masterbatch. The halogen-free insulated cable material of the present invention has excellent insulating property and flame retardancy, and can achieve the halogen-free flame retardant VW-1, and releases a very low amount of smoke when burning, making a light transmittance of greater than 90% in the smoke, and also has excellent mechanical properties and electrical properties, and can suffer capacitance change rate test at 90° C.