The invention discloses an enhanced anti-seismic structure suitable for urban underground comprehensive pipe galleries. Comprising a polygonal frame with an outer frame and an inner frame arranged inside it. Vertex of the inner frame is connected to the bending position inside the outer frame via a support rod. Outer frame has installation grooves for pipe installation, corresponding one-to-one with its sides. The outer frame, located outside the installation groove, can be disassembled to install a limit frame. A limit mechanism for fixing the pipe is installed on the limit frame. The outer frame, positioned outside the installation slot, can be disassembled to install a limit frame. Screwing in a screw drives a lifting block to compress a spring, causing a top block to press against the pipe surface and secure it. The polygonal frame allows for multiple pipes to be installed simultaneously, enhancing overall stability through the support rod connections.

A drain assembly for being placed inground includes a first panel and a second panel spaced-apart from the first panel, a plurality of supports extending between the first panel and the second panel, a bottom or pipe extending between a bottom portion of the first panel and the second panel, and a cap extending between a top portion of the first panel and the second panel. The first panel may define a plurality of drainage apertures. A related method is also provided.

A modular assembly is provided for detaining or retaining a liquid beneath a ground surface. The assembly featuring a plurality of substantially identical precast unitary concrete modules with each module having a deck portion with outer edges and a plurality of spaced apart legs extending from the deck portion. At least two of the legs of a module are spaced inwardly from the nearest outer edge of the deck portion of the same module so that a portions of the deck overhangs each of said legs. The legs and deck portions define flow paths within each module that are in fluid communication with each other with the flow paths being both outside the legs and between the legs. Each module in the assembly is further positioned with its deck adjacent to the deck of another module.

A drain assembly capable of being placed inground includes a first panel and a second panel spaced-apart from the first panel, a plurality of supports extending between the first panel and the second panel, a bottom or pipe extending between a bottom portion of the first panel and the second panel, and a cap extending between a top portion of the first panel and the second panel. The first panel may define a plurality of drainage apertures. A related method is also provided.

The invention discloses a multi-stage shock absorption and seismic resistance system for urban underground comprehensive pipe tunnels. It includes a pipe gallery tunnel and pipeline grooves. Inside the tunnel, a multi-segment active cavity with multiple arc-shaped inner cavity walls forms a pipe shape with the same axis line as the tunnel. Each inner cavity wall has a sealing elastic contact pad, ensuring a tight seal. Adjacent active cavities connect end to end, forming an inner tunnel body that extends with the pipe tunnel. The outer wall of the inner cavity is fixed to the tunnel's inner wall by a fixed frame. The pipeline groove is installed on the inner wall of the inner cavity through a telescopic frame. The inner tunnel body can swing up and down or left and right, absorbing transverse and longitudinal earthquake waves and resisting impact and collapse.

An underwater floating pipeline with the ability to self-maintain desired depth beneath the water giving the ability to connect distant locations. The sections maintain and alter buoyancy for repair and maintenance. Multi chambered pipes allow different rates of flow. Automatic snap-shut doors protect against leaks and loss of pressure. Warning systems alert those in proximity to the pipeline. Freight may use the tunnels to avoid adverse surface weather and high shipping cost and fuel and labour savings.

A drain assembly capable of being placed inground includes a first panel and a second panel spaced-apart from the first panel, a plurality of supports extending between the first panel and the second panel, a bottom or pipe extending between a bottom portion of the first panel and the second panel, and a cap extending between a top portion of the first panel and the second panel. The first panel may define a plurality of drainage apertures. A related method is also provided.