In early July 2003, during the construction of a link in a section of Shanghai Metro Line 4 in the process of adopting the "freezing method," water seepage occurred and an influx of quicksand occurred, causing a drastic settlement of the ground construction and collapsing of the flood control dike nearby. So that the industry is extremely shocked, but also to further enable the construction unit to think about how to effectively and reliably strata reinforcement in the excavation of underground works. At present, the domestic construction unit is also actively looking for and consulting related new construction equipment. In view of this, this article introduces the application of mortar pump in underground engineering for reference. Grouting technology is a traditional and effective method for reinforcement construction of underground engineering. Even a relatively new and advanced "freezing method" also needs to be grouted and reinforced at a local site. At present, more equipment is used in grouting construction. The rated pressure is about 1.5 ~ 2MPa and the flow rate is 0.4 ~ 3m3 / h. The UB8 mortar pump developed by our institute during the Ninth Five-Year Plan period has high pressure , The delivery of large and uniform flow, can transport a certain amount of sand slurry, the need to maintain the work less frequently, with superior performance, the construction of hydraulic projects in the construction of much favor, after a lot of practice has proved that the product Achieve the following reliable performance indicators: Rated pressure: 6MPa (design pressure 8Mpa) Rated flow: 8m3 / h Horizontal conveying conveying distance: 300m (mortar) Second, the structure introduced By the motor through the reducer drive with a specific trajectory of the cam rotation, pushing the piston forward. Pistons in the return cylinder and valve chamber relative to form a vacuum, the slurry from the hopper through the suction tube into the lower valve chamber and the cylinder. As the piston moves forward, the pressure in the working cylinder and the valve chamber increases. The piston cylinder pushes the mortar in the working cylinder and the valve chamber out of the upper valve chamber. In this way, the mortar is continuously pumped out continuously. Third, the construction method Grouting methods are pure pressure grouting and circulating grouting two. General soil grouting large amount of suction slurry, the use of pure pressure grouting; fractured rock mass suction small, the use of circulating grouting. According to the grouting material, it can be divided into single grouting and double grouting. Two-fluid gel time is longer, both in the tank after mixing with a single pump injection, known as single gun injection. Gel time is medium (2 ~ 5min), double-liquid pump in the hole after the injection of mixed, known as the injection of 1.5 guns; gel time is short, the double pump with double pump into the bottom of the hole after the injection, said For two guns injection. Single shot grouting and double grouting in the injection of a single shot with a mortar pump (hereinafter referred to as single-pump grouting), two-shot grouting injection 1.5 shots and two shots are required two mortar pump (hereinafter referred to as Double pump grouting). The actual construction of the soil and grouting materials according to different installation and configuration of equipment, there are four possible grouting combination configuration, namely: single-pump pure pressure grouting, single-pump circulating grouting, double-pump pure pressure injection Pulp, double pump circulating grouting (as shown). After grouting, the equipment must be cleaned immediately to prevent the equipment from condensing in the equipment. Mortar pump flow through the - valve adjustment to meet the slurry ratio design requirements. Double pump grouting schematic 1-A liquid mortar pump 2-pressure gauge 3- syringes 4-return pipe 5-lose slurry pipeline 6-mixer 7-B tank 8-A tank 9-B liquid mortar pump
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Application fields:
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3. Blade:Hard alloy blade, high speed steel blade, etc;
4. Others:Magnetic parts, artificial gemstone, etc.
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First, the technical performance
