The present invention relates to a polymer expanding material in infiltration or seepage multi-water environment and a preparation method thereof, belonging to a technical field of polymer expanding foam materials. The polymer expanding material includes the following parts of materials by weight: 20-30 parts of rosin polyester polyol, 20-50 parts of isocyanate, 20-40 parts of PhireGuard® MB-512, 5-10 parts of HFO-1233zd, 1-2 parts of surfactant, 0.01-1 part of catalyst, and 0.01 parts of benzoyl chloride. The present invention has high sand fixing body strength, fast curing speed, good elastoplasticity, good pouring property and permeability, and good expanding property, which is suitable for infiltration or seepage multi-water environment, especially for dam infiltration, piping, and other problems during construction and subsequent operation of water conservancy projects.

A seawall comprising a base with a top, a plurality of extensions on the top of the base, and an adhesive or sealant securing the extensions to the base. Each extension comprises a plurality of spaced apart rubber poles extending generally in a direction horizontal to the sea floor, and an outer rubber covering surrounding the poles. A method of increasing the height of a seawall comprising the steps of placing a plurality of the extensions on top of the seawall with the poles extending substantially parallel to the sea floor, and securing the extensions to the top of the seawall.

A tsunami-wave structure is provided for installation in the bottom of the sea/ocean in the near-shore area which is exposed to the air at the time of a low tide that precedes the arrival of tsunami. Normally, the structure is immersed in water and when exposed to air before arrival of the tsunami wave assumes a tsunami-wave dampening position under the effect of its own gravity. This is achieved by making the structure in the form of a two-lever mechanism having two lever arms separated by a fulcrum point with a counterweight attached to the end of one the lever arms and a tsunami-wave breaker pivotally connected to the end of the other lever arm so that when the structure is exposed to the air the tsunami-wave breaker is turned down and allows the counterweight to outweigh the tsunami-wave breaker and to raise it to the operation position.

A movable tsunami buffer dam has a unit configured such that a plurality of separate units, each of which having a shape in which a frame made of a light material is sandwiched by a pair of plates made of a light material, is stacked with said plates disposed in a pile; and a locking member for locking said unit to a ground surface such that said unit can rise up from said ground surface and collapse onto said ground surface. The separate units has a structure in which water from a tsunami can advance into a space formed between said plates by said frame.

A required thickness is ensured due to said unit being configured such that said separate units are stacked, and the manufacturing cost is reduced to a greater extent than in the case of a dam configured from a single separate unit of said required thickness, because the big size lumber for obtaining the units is very expensive. The unit is installed in a state of being collapsed on said ground surface at normal times, and when a tsunami arrives, said unit rising up due to the force of the tsunami and the buoyancy of the seawater, resisting the passage of the tsunami and reducing the power of the tsunami.

The present invention relates to an erosion control apparatus and methods of using and installing the apparatus. The apparatus is constructed to prevent erosion of soil during typical weather or tidal conditions and adverse weather events. The apparatus can include a plurality of anchored rolls and soil lifts operative to stabilize the shoreline.

A water area may be sheltered by installing, at an active boundary of the water area, a plurality of shields mounted on posts, each shield having a lower edge immersed in the water. Each shield may dissipate at least a portion of wave energy approaching the active boundary of the water area. One or more piers may be positioned within the sheltered water area or basin.

A water wave breaker includes an attachment portion and a curved concave portion. The curved concave portion is connected with the attachment portion. When the attachment portion is attached to a substantially vertically extending surface a first end of the curved concave portion, which is disposed laterally farther away from the attachment portion than a second end of the curved concave portion, is disposed above the second end of the curved concave portion with the curved concave portion oriented in a downward direction away from the substantially vertically extending surface.

A system and method to create or elevate a berm of a liquid retention facility by placement of lightweight fill material anchored by an impervious liner material(s). The impervious liner material is integral to a water retention system such as a containment system of a retention pond. The system and method can also be used to elevate the liquid retention height of a levee in combination with impervious liner retention material. By constructing the berm system on an existing levee, the effective height of the levee can be increased. The lightweight fill material provides the shape of the berm or levee extension. The liquid impervious liner material provides a watertight surface, the media for joining of the lightweight fill material, and the anchoring of the lightweight fill material to the existing berm or levee structure.

A method for constructing a seawall section includes coupling an end of a substantially-waterproof barrier member to a footing. A concrete form is mounted to the footing such that a top end of the form is higher than an exposed upper surface of the footing. The concrete form defines at least part of a fill volume. Another end of the barrier member is coupled to the concrete form such that the barrier member extends over a side of the concrete form opposite the fill volume. Concrete is then poured into the fill volume and cured to form the seawall section. Prior to the curing, a body of water at the footing may be higher than the upper surface of the footing. However, the barrier member prevents water from entering the fill volume through the concrete form.

Seawalls and methods for making seawalls are disclosed. A seawall may include a concrete footing, with a first plurality of anchorages disposed in the concrete footing. A plurality of precast concrete tee beams may include single-tee beams and/or double-tee beams. Flanges of the tee beams may be positioned to form seaward and landward faces of the wall, and stems of the tee beams may be coupled to the footing between the seaward and landward faces. A second plurality of anchorages may be disposed at tops of the stems. Elongate steel components extend through the stems, and are tensioned between the first plurality of anchorages and the second plurality of anchorages. Interior fill may be disposed between the seaward and landward faces. One or more wave deflectors may be disposed above the tee beams.