2results about How to "Good water stop effect" patented technology

The present application relates to a kind of for locking steel pipe pile cofferdam water stop pressure grouting device, including a support frame, pressure grouting pipe, annular air bag and inflation pipe;The support frame includes upper support plate and lower support plate, there is a certain interval between upper support plate and lower support plate and welding connecting rod, multiple buckles are arranged in equidistance rotation on the edge of upper support plate, and the lower end of buckle is located below upper support plate and is inclined to the outside of upper support plate upwards;Pressure grouting pipe vertically penetrates upper support plate and lower support plate;Annular air bag is located between the upper support plate and lower support plate of support frame, annular air bag can extrude the lower end of buckle to rotate to the outside of upper support plate in inflation state, and its annular outside surface protrudes to the outside of upper support plate and lower support plate;Inflation pipe penetrates upper support plate and inflates and deflates air bag.The present application can be combined with rock by the way of high-pressure grouting to press cement slurry from inside steel pipe pile to outside steel pipe pile, so that steel pipe pile is closely combined with rock, and the water stop effect of steel pipe pile cofferdam is improved.

The application relates to a deep-water pebble covering layer buried type lock steel pipe pile cofferdam water stop construction method, a steel casing is first inserted and driven at a designed insertion and driving position of a steel pipe pile, the steel pipe pile is inserted and driven to a rock layer below a pebble covering layer, a large-diameter steel pipe pile hole is formed, then clay is backfilled in the steel casing, and the steel casing is pulled out; a plurality of slurry outlet holes are formed on a pipe wall of a lower end of the steel pipe pile in advance, the steel pipe pile is inserted into the pile hole, clay in the steel pipe pile is removed, a grouting device is placed in the steel pipe pile, the grouting device forms a closed space in the steel pipe pile, cement slurry is pressed into the steel pipe pile through the grouting device, the cement slurry is pressed into a space between the steel pipe pile and the rock layer through the slurry outlet holes on the steel pipe pile under high pressure, the steel pipe pile is firmly combined with the rock layer, the steel pipe pile can be kept stable under the action of water flow impact, water outside the cofferdam can be prevented from penetrating into the cofferdam from the space between the steel pipe pile and the rock layer, and therefore the water stop effect of the cofferdam is improved.