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Enhanced plugging material for steel sheet piling cofferdam and its preparation and application method

A technology for steel sheet pile cofferdams and leak-stopping materials, applied to sheet pile walls, chemical instruments and methods, and other chemical processes, can solve problems such as increased construction time, water leakage and water seepage at difficult steel sheet pile joints, and achieve operational construction Convenience, excellent fluidity and cohesiveness, the effect of good fluidity

Inactive Publication Date: 2013-06-05
SHANGHAI DONGDA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the number of steel sheet piles that need to be used is more than twice that of a single-layer steel sheet, and the construction time is correspondingly increased
Moreover, it is difficult to fundamentally solve the problem of water leakage and water seepage at the joints of steel sheet piles.

Method used

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  • Enhanced plugging material for steel sheet piling cofferdam and its preparation and application method
  • Enhanced plugging material for steel sheet piling cofferdam and its preparation and application method
  • Enhanced plugging material for steel sheet piling cofferdam and its preparation and application method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Prepare the steel sheet pile cofferdam reinforcement plugging material according to the following steps

[0044] ①. Dehydration

[0045] Put 80 parts by weight of polyoxypropylene diol 330N with a relative molecular mass of 5000±200 terminated with ethylene oxide, and 10 parts by weight of polyoxyethylene tetrahydric alcohol SD101 with a relative molecular mass of 9800±200, put them into the polymerization reactor, and start stirring , heat up to 80-100°C, dehydrate for 2-3 hours under vacuum, remove trace moisture in the polymer polyol and the reaction system, cool down to 10-40°C, and prepare the polyurethane prepolymer;

[0046] ②. Preparation of polyurethane prepolymer

[0047] Under stirring, put 0.01 parts by weight of retarder phosphoric acid, 9 parts by weight of toluene diisocyanate TDI, and 1 part by weight of polyphenylpolymethylene polyisocyanate PAPI into the reaction system after dehydration in step ① in sequence, at 80-85 ° C Under high temperature, rea...

Embodiment 2～ Embodiment 5

[0051] According to the method and steps of Example 1, prepare the steel sheet pile cofferdam reinforcement plugging material of the present invention according to the formula in Table 1

[0052] Table 1

[0053]

[0054] The steel sheet pile cofferdam reinforced plugging material prepared in Examples 1 to 5 has a viscosity of 300--750mPa.s at 20°C, which ensures good fluidity of the material liquid, and the single-component glue is easy to use, and the film after expansion can The water resistance pressure is 500-570kpa, which is equivalent to no water leakage at a water depth of 50-60 meters; the experiment in 3% saline artificial seawater also meets the above technical indicators.

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Abstract

The invention provides an enhanced plugging material for a steel sheet piling cofferdam and its preparation and application method. The plugging material belongs to a polyurethane composition. The invention especially relates to a polyurethane performed polymer sealing and reinforcing material used for joints of steel sheet piles of a cofferdam for a foundation pit during infrastructure construction of underground and water projects and to a preparation method and an application method for the material. The material comprises, by weight, 100 to 120 parts of polyurethane performed polymers, 0 to 30 parts of a solvent and 0.1 to 5.0 parts of a catalyst. The enhanced plugging material, which has the advantages of conservation of the resource of steel plates, convenient construction, capacity of accelerating progress of a program and ensuring stable rigidity of a cofferdam and good anti-seepage and water-plugging effects, and its preparation and application method are provided in the invention. According to the invention, the problems of water leakage and water seepage at the joints of steel sheet piles in the prior art are overcome; the plugging material has a viscosity suitable forcoating and good fluidity and bond properties and is convenient to operate and construct; after steel sheet piles are knocked into ground and encounter water, a coating on the steel sheet piles swells and becomes 20 times of an original size of the coating within 24 hours, and therefore, slits between steel plates are filled through swelling, thereby realizing the function of water plugging. The steel sheet piles are repeatedly usable.

Description

technical field [0001] The invention relates to a steel sheet pile cofferdam reinforcement plugging material and a preparation method thereof. It belongs to polyurethane composition. In particular, the invention relates to a polyurethane prepolymer sealing and reinforcing material used for foundation pit cofferdam steel sheet pile joints and its preparation method and use method in underground and water engineering foundation construction. Background technique [0002] Steel sheet pile cofferdam has the advantages of high material rigidity, good water-retaining and anti-seepage performance, convenient construction technology, fast project progress, and can be reused. Supporting engineering, underground, underwater construction and many other fields are widely used. [0003] The main steel sheet of the steel sheet pile has good water-proof performance, but the gap between the joints of the steel sheet pile is prone to water leakage and water seepage. It affects the normal ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L75/08C08G18/48C08G18/32C08G18/10C09K3/12E02D5/14
Inventor 于鹏程董建国王振波杜辉
Owner SHANGHAI DONGDA CHEM
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