Big board straight column foundation grouting method

Big board straight column foundation grouting technology standard 1 cement should be not less than 42. 5 slag Portland cement and ordinary Portland cement. 2 coarse sand in the sand, silt content is not more than 5%. Three stones silt content is not more than 2%. 4 the water tap water or clean water does not contain harmful substances. 5 admixture, admixture, the varieties and dosage should be according to the needs, determined by experiment. 6 of concrete, surface level off, smooth, angular, forming at a time. 7 deviation control requirements. 1 base + 80 mm in depth, 0 mm; 2 column section size - and the base 0. 8%; 3 - reinforced protective layer thickness 5毫米; Four basic root and diagonal + 1. 6‰； 5 top elevation difference of 5 mm; 6 group anchor bolt to columns center offset 8 mm; Anchor bolt to show concrete surface height 7 + 10 mm, - 5mm。 The construction ( 1) The soil excavation geological conditions to determine the slope coefficient. Underground water level is high, should take effective measures, the precipitation of well point drainage quicksand pit should be taken. Shall ensure that no water construction base casting. （ 2) After the completion of the foundation pit excavation should be timely watering system, otherwise don't should stay above 200 mm soil excavation to ensure the undisturbed soil, bottom foundation excavation before casting. Wet, and so on and so forth should be stuck on the yellow, the puddle bedding processing according to design requirements. Cushion layer strength meets the requirements for rear steel binding and templates can be. （ 3) Concrete template surface should be smooth and joint tightly, template surface should be coated before concrete pouring mold release agent. （ 4) Accord with requirement of JGJ18 steel welding, steel binding is firm, uniform, welding head of stagger arrangement, in the same section with section welding head amount shall not exceed 50%. （ 5) Comply with the design requirements of reinforced protective layer thickness control ( The public number: electric line) 。 （ 6) Before concrete pouring steel, anchor bolt surface should be clean. （ 7) In situ concrete should use mechanical agitation, and should adopt mechanical stamping. （ 8) Concrete cutting height more than 2 m, the measures should be taken to prevent segregation. （ 9) Concrete foundation should be maintenance measures should be taken according to seasons and climate. Winter construction antifreezing measures should be taken. （ 10) Within a concrete foundation shall be casting molding, solid outside light, put an end to decorate, secondary plaster.